Hp laserjet p1102 инструкция по разборке - Большая энциклопедия инструкций и руководств

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Подготовьте принтер к разборке

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LASERJET PROFESSIONAL P1100

SERIES PRINTER

Service Manual

www.hp.com/support/ljp1100series

HP LaserJet Professional P1100 Printer series

Service Manual

Development Company, L.P.

Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws.

The information contained herein is subject to change without notice.

The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.

Part number: CE651-90953

Edition 1, 4/2010

Trademark Credits

Microsoft®, Windows®, Windows® XP, and Windows Vista® are U.S. registered trademarks of Microsoft Corporation.

Conventions used in this guide

TIP: Tips provide helpful hints or shortcuts.

NOTE: Notes provide important information to explain a concept or to complete a task.

CAUTION: Cautions indicate procedures that you should follow to avoid losing data or damaging the product.

WARNING! Warnings alert you to specific procedures that you should follow to avoid personal injury, catastrophic loss of data, or extensive damage to the product.

iv Conventions used in this guide

ENWW

Table of contents

1 Theory of operation ……………………………………………………………………………………………………………………….	1
Basic operation …………………………………………………………………………………………………………………….	2
Major product systems ……………………………………………………………………………………………	2
Product block diagram ……………………………………………………………………………………………	2
Sequence of operation ……………………………………………………………………………………………	3
Normal sequence of operation ………………………………………………………………….	3
Formatter-control system ………………………………………………………………………………………………………	4
Sleep mode …………………………………………………………………………………………………………..	4
Input/output …………………………………………………………………………………………………………..	4
CPU …………………………………………………………………………………………………………………….	4
Memory ………………………………………………………………………………………………………………..	4
Firmware ……………………………………………………………………………………………….	5
Memory use …………………………………………………………………………………………..	5
PJL overview ………………………………………………………………………………………………………..	5
LEDM overview ……………………………………………………………………………………………………..	5
ACL overview ………………………………………………………………………………………………………..	5
Control panel ………………………………………………………………………………………………………..	6
Wireless PCA ………………………………………………………………………………………………………..	6
Engine-control system …………………………………………………………………………………………………………..	7
Motors, fans, clutches, solenoids, switches, and sensors ……………………………………………	8
DC controller operations ……………………………………………………………………………………….	11
Fuser-control circuit ……………………………………………………………………………………………..	12
Fuser failure detection ……………………………………………………………………………	13
Fuser temperature control ………………………………………………………………………	14
Fuser protective function ………………………………………………………………………..	15
Pressure roller cleaning …………………………………………………………………………	15
Low-voltage power supply …………………………………………………………………………………….	16
Overcurrent/overvoltage protection ………………………………………………………….	17
High-voltage power supply ……………………………………………………………………………………	18
Laser/scanner system …………………………………………………………………………………………..	19
Laser failure detection ……………………………………………………………………………	20
Image-formation system ………………………………………………………………………………………………………	21
Electrophotographic process …………………………………………………………………………………	21
Image formation process ………………………………………………………………………………………	23

Latent-image formation stage …………………………………………………………………	24
Primary charging ……………………………………………………………………	24
Laser beam exposure ……………………………………………………………..	24
Developing stage ………………………………………………………………………………….	25
Print cartridge ………………………………………………………………………..	25
Transfer stage ………………………………………………………………………………………	26
Fusing stage ………………………………………………………………………….	27
Cleaning stage ……………………………………………………………………….	27
Pickup, feed, and delivery system …………………………………………………………………………………………	28
Photo sensors and switches ………………………………………………………………………………….	29
Input tray, main-input tray, or priority input slot ……………………………………………………………………….	30
Jam detection ……………………………………………………………………………………………………..	30
2 Removal and replacement ……………………………………………………………………………………………………………	31
Introduction ………………………………………………………………………………………………………………………..	32
Removal and replacement strategy ………………………………………………………………………………………	32
Electrostatic discharge ………………………………………………………………………………………………………..	33
Required tools …………………………………………………………………………………………………………………..	33
Before performing service ……………………………………………………………………………………………………	34
After performing service ………………………………………………………………………………………………………	34
Post-service test …………………………………………………………………………………………………………………	35
Print-quality test …………………………………………………………………………………………………..	35
Parts removal order …………………………………………………………………………………………………………….	36
Pickup roller ……………………………………………………………………………………………………………………….	37
Separation pad …………………………………………………………………………………………………………………..	38
Transfer roller …………………………………………………………………………………………………………………….	39
Covers ………………………………………………………………………………………………………………………………	40
Input tray or main-input tray …………………………………………………………………………………..	40
Output bin tray extension ………………………………………………………………………………………	41
Front cover ………………………………………………………………………………………………………….	42
Remove the front cover ………………………………………………………………………….	42
Left cover ……………………………………………………………………………………………………………	43
Remove the left cover ……………………………………………………………………………	43
Right cover ………………………………………………………………………………………………………….	46
Remove the right cover ………………………………………………………………………….	46
Cartridge door ……………………………………………………………………………………………………..	48
Remove the cartridge door ……………………………………………………………………..	48
Face-down cover …………………………………………………………………………………………………	50
Remove the face-down cover …………………………………………………………………	50
Rear cover ………………………………………………………………………………………………………….	52
Remove the rear cover …………………………………………………………………………..	52
Main assemblies …………………………………………………………………………………………………………………	54
Formatter PCA …………………………………………………………………………………………………….	54

Remove the formatter PCA …………………………………………………………………….	55
Wireless PCA ………………………………………………………………………………………………………	57
Remove the wireless PCA ……………………………………………………………………..	57
Laser/scanner assembly ……………………………………………………………………………………….	58
Remove the laser/scanner assembly ……………………………………………………….	58
Reinstall the laser/scanner assembly ……………………………………………………….	60
Pickup assembly ………………………………………………………………………………………………….	61
Remove the pickup assembly …………………………………………………………………	61
Reinstall the pickup assembly …………………………………………………………………	65
Fuser ………………………………………………………………………………………………………………….	67
Remove the fuser ………………………………………………………………………………….	67
Reinstall the fuser …………………………………………………………………………………	71
Main motor ………………………………………………………………………………………………………….	72
Remove the main motor …………………………………………………………………………	72
Reinstall the main-motor drive belt …………………………………………………………..	76
Pickup solenoid ……………………………………………………………………………………………………	77
Remove the pickup solenoid …………………………………………………………………..	77
Engine controller PCA ………………………………………………………………………………………….	80
Remove the engine controller PCA ………………………………………………………….	80
Reinstall the engine controller PCA …………………………………………………………	84
3 Solve problems ……………………………………………………………………………………………………………………………	87
Solve problems checklist ……………………………………………………………………………………………………..	88
Troubleshooting process ……………………………………………………………………………………………………..	91
Determine the problem source ……………………………………………………………………………..	91
Power subsystem ………………………………………………………………………………………………..	92
Power-on checks …………………………………………………………………………………..	92
Tools for troubleshooting ……………………………………………………………………………………………………..	93
Individual component diagnostics …………………………………………………………………………..	93
Engine diagnostics ………………………………………………………………………………..	93
Engine-test button ………………………………………………………………….	93
Components tests …………………………………………………………………………………	94
Drum rotation functional check ………………………………………………..	94
Half self-test functional check …………………………………………………..	94
Diagrams ……………………………………………………………………………………………………………	95
Plug/jack locations ………………………………………………………………………………..	95
Location of connectors …………………………………………………………………………..	96
Locations of major components ………………………………………………………………	97
General timing charts …………………………………………………………………………….	99
General circuit diagram ………………………………………………………………………..	100
Internal print-quality test pages …………………………………………………………………………….	102
Cleaning page …………………………………………………………………………………….	102
Configuration page ………………………………………………………………………………	102

Print-quality troubleshooting tools …………………………………………………………………………	103
Repetitive defect ruler ………………………………………………………………………….	103
Interpret control-panel light patterns ……………………………………………………………………..	103
Clear jams ……………………………………………………………………………………………………………………….	107
Common causes of jams …………………………………………………………………………………….	107
Jam locations …………………………………………………………………………………………………….	108
Clear jams from the input tray ………………………………………………………………………………	109
Clear jams from the output areas …………………………………………………………………………	111
Clear jams from inside the product ……………………………………………………………………….	113
Solve repeated jams …………………………………………………………………………………………..	114
Change jam recovery …………………………………………………………………………………………	114
Solve paper-handling problems …………………………………………………………………………………………..	116
Solve image-quality problems …………………………………………………………………………………………….	117
Image defect table ……………………………………………………………………………………………..	117
Light print or faded ………………………………………………………………………………	117
Toner specks ………………………………………………………………………………………	117
Dropouts …………………………………………………………………………………………….	118
Vertical lines ……………………………………………………………………………………….	118
Gray background …………………………………………………………………………………	118
Toner smear ……………………………………………………………………………………….	118
Loose toner ………………………………………………………………………………………..	119
Vertical repetitive defects ……………………………………………………………………..	119
Misformed characters …………………………………………………………………………..	119
Page skew ………………………………………………………………………………………….	119
Curl or wave ……………………………………………………………………………………….	120
Wrinkles or creases ……………………………………………………………………………..	120
Toner scatter outline ……………………………………………………………………………	120
Moisture …………………………………………………………………………………………….	121
Optimize and improve image quality ……………………………………………………………………..	122
Change print density ……………………………………………………………………………	122
Clean the product ……………………………………………………………………………………………………………..	123
Clean the pickup roller ………………………………………………………………………………………..	123
Clean the paper path ………………………………………………………………………………………….	124
Clean the print-cartridge area ………………………………………………………………………………	126
Clean the exterior ………………………………………………………………………………………………	128
Solve performance problems ……………………………………………………………………………………………..	129
Solve connectivity problems ……………………………………………………………………………………………….	130
Solve direct-connect problems …………………………………………………………………………….	130
Solve wireless problems ……………………………………………………………………………………..	130
Service mode functions ……………………………………………………………………………………………………..	132
Product resets ……………………………………………………………………………………………………	132
Product updates ……………………………………………………………………………………………………………….	133

4 Parts and diagrams …………………………………………………………………………………………………………………….	135
Order parts by authorized service providers …………………………………………………………………………	136
Order parts, accessories, and supplies …………………………………………………………………	136
Related documentation and software ……………………………………………………………………	136
Supplies part numbers ………………………………………………………………………………………..	136
Customer self repair parts …………………………………………………………………………………..	137
Service parts ……………………………………………………………………………………………………..	137
Whole-unit replacement part numbers …………………………………………………………………..	137
How to use the parts lists and diagrams ………………………………………………………………………………	138
Assembly locations ……………………………………………………………………………………………………………	139
Base product ……………………………………………………………………………………………………..	139
Covers …………………………………………………………………………………………………………………………….	140
Base model ……………………………………………………………………………………………………….	140
Wireless model ………………………………………………………………………………………………….	142
Internal assemblies …………………………………………………………………………………………………………..	144
Internal assemblies (1 of 3) …………………………………………………………………………………	144
Internal assemblies (2 of 3) …………………………………………………………………………………	146
Internal assemblies (3 of 3) …………………………………………………………………………………	148
PCAs ………………………………………………………………………………………………………………………………	150
Alphabetical parts list ………………………………………………………………………………………………………..	152
Numerical parts list ……………………………………………………………………………………………………………	155
Appendix A Service and support …………………………………………………………………………………………………..	159
Hewlett-Packard limited warranty statement …………………………………………………………………………	160
HP’s Premium Protection Warranty: LaserJet print cartridge limited warranty statement …………….	161
End User License Agreement …………………………………………………………………………………………….	162
Customer self-repair warranty service ………………………………………………………………………………….	164
Customer support ……………………………………………………………………………………………………………..	164
Repack the product …………………………………………………………………………………………………………..	165
Service information form ……………………………………………………………………………………………………	166
Appendix B Specifications …………………………………………………………………………………………………………….	167
Physical specifications ………………………………………………………………………………………………………	168
Power consumption …………………………………………………………………………………………………………..	168
Acoustic specifications ………………………………………………………………………………………………………	168
Environmental specifications ………………………………………………………………………………………………	169
Appendix C Regulatory information ………………………………………………………………………………………………	171
FCC regulations ……………………………………………………………………………………………………………….	172
Declaration of conformity (base models) ………………………………………………………………………………	173
Declaration of conformity (wireless models) ………………………………………………………………………….	174
Certificate of Volatility ………………………………………………………………………………………………………..	175
Safety statements ……………………………………………………………………………………………………………..	177

Laser safety ………………………………………………………………………………………………………	177
Canadian DOC regulations ………………………………………………………………………………….	177
VCCI statement (Japan) ……………………………………………………………………………………..	177
Power cord instructions ………………………………………………………………………………………	177
Power cord statement (Japan) ……………………………………………………………………………..	177
EMC statement (Korea) ………………………………………………………………………………………	177
Laser statement for Finland …………………………………………………………………………………	178
GS statement (Germany) …………………………………………………………………………………….	178
Substances Table (China) …………………………………………………………………………………..	179
Additional statements for wireless products ………………………………………………………………………….	180
FCC compliance statement—United States …………………………………………………………..	180
Australia statement …………………………………………………………………………………………….	180
Brazil ANATEL statement ……………………………………………………………………………………	180
Canadian statements ………………………………………………………………………………………….	180
European Union regulatory notice ………………………………………………………………………..	180
Notice for use in France ………………………………………………………………………………………	181
Notice for use in Russia ………………………………………………………………………………………	181
Korean statement ………………………………………………………………………………………………	181
Taiwan statement ………………………………………………………………………………………………	181
Index ……………………………………………………………………………………………………………………………………………..	183

List of tables

Table 1-1 Sequence of operation ………………………………………………………………………………………………………..	3
Table 1-2	Motors ………………………………………………………………………………………………………………………………	8
Table 1-3 Solenoids and clutches ……………………………………………………………………………………………………….	9
Table 1-4	Switches ……………………………………………………………………………………………………………………………	9
Table 1-5	Sensors …………………………………………………………………………………………………………………………..	10
Table 1-6 DC controller controlled components …………………………………………………………………………………..	11
Table 1-7 Photo sensors, motor, and solenoid ……………………………………………………………………………………	29
Table 3-1 Basic problem solving ……………………………………………………………………………………………………….	88
Table 3-2	Status-light legend ………………………………………………………………………………………………………….	103
Table 3-3 Control-panel light patterns ………………………………………………………………………………………………	104
Table 4-1 Order parts, accessories, and supplies ………………………………………………………………………………	136
Table 4-2 Related documentation and software ………………………………………………………………………………..	136
Table 4-3 Supplies part numbers …………………………………………………………………………………………………….	136
Table 4-4 Customer replaceable units (CRU) kit part numbers ……………………………………………………………	137
Table 4-5 Whole-unit replacement part numbers ……………………………………………………………………………….	137
Table 4-6	Base product ………………………………………………………………………………………………………………….	139
Table 4-7	Base model ……………………………………………………………………………………………………………………	141
Table 4-8	Wireless model ……………………………………………………………………………………………………………….	143
Table 4-9 Internal assemblies (1 of 3) ………………………………………………………………………………………………	145
Table 4-10 Internal assemblies (2 of 3) …………………………………………………………………………………………….	147
Table 4-11 Internal assemblies (3 of 3) …………………………………………………………………………………………….	149
Table 4-12	PCAs …………………………………………………………………………………………………………………………..	151
Table 4-13 Alphabetical parts list …………………………………………………………………………………………………….	152
Table 4-14 Numerical parts list ………………………………………………………………………………………………………..	155
Table B-1	Physical specifications1 ……………………………………………………………………………………………………	168
Table B-2 HP LaserJet Professional P1100 Printer series (average in watts)123 …………………………………….	168
Table B-3 HP LaserJet Professional P1100 Printer series12 ………………………………………………………………..	168
Table B-4	Environmental specifications ……………………………………………………………………………………………	169

List of figures

Figure 1-1 Product block diagram ……………………………………………………………………………………………………….	2
Figure 1-2	Engine-control system ……………………………………………………………………………………………………….	7
Figure 1-3	Motors ……………………………………………………………………………………………………………………………..	8
Figure 1-4 Solenoids and clutches ………………………………………………………………………………………………………	9
Figure 1-5	Switches ………………………………………………………………………………………………………………………….	9
Figure 1-6	Sensors ………………………………………………………………………………………………………………………….	10
Figure 1-7 DC controller block diagram ………………………………………………………………………………………………	11
Figure 1-8 Fuser control circuit ………………………………………………………………………………………………………….	12
Figure 1-9 Fuser-heater control circuit ……………………………………………………………………………………………….	14
Figure 1-10 Low-voltage power supply (LVPS) ……………………………………………………………………………………	16
Figure 1-11 High-voltage power supply ………………………………………………………………………………………………	18
Figure 1-12	Laser/scanner system …………………………………………………………………………………………………….	19
Figure 1-13 Electrophotographic process block diagram (1 of 2) …………………………………………………………..	21
Figure 1-14 Electrophotographic process block diagram (2 of 2) …………………………………………………………..	22
Figure 1-15 Image formation process ………………………………………………………………………………………………..	23
Figure 1-16	Primary charging ……………………………………………………………………………………………………………	24
Figure 1-17 Laser beam exposure …………………………………………………………………………………………………….	24
Figure 1-18	Print cartridge ………………………………………………………………………………………………………………..	25
Figure 1-19	Transfer ………………………………………………………………………………………………………………………..	26
Figure 1-20	Separation …………………………………………………………………………………………………………………….	26
Figure 1-21	Fusing ………………………………………………………………………………………………………………………….	27
Figure 1-22	Drum cleaning ……………………………………………………………………………………………………………….	27
Figure 1-23 Pickup, feed, and delivery system block diagram ……………………………………………………………….	28
Figure 1-24 Photo sensors, motor, and solenoid …………………………………………………………………………………	29
Figure 2-1 Phillips and pozidrive screwdriver comparison …………………………………………………………………….	33
Figure 2-2 Parts removal order …………………………………………………………………………………………………………	36
Figure 2-3 Remove the pickup roller (1 of 2) ……………………………………………………………………………………….	37
Figure 2-4 Remove the pickup roller (2 of 2) ……………………………………………………………………………………….	37
Figure 2-5 Remove the separation pad assembly ……………………………………………………………………………….	38
Figure 2-6 Remove the transfer roller ………………………………………………………………………………………………..	39
Figure 2-7 Remove the tray ………………………………………………………………………………………………………………	40
Figure 2-8 Remove the output bin tray extension ………………………………………………………………………………..	41
Figure 2-9 Remove the front cover ……………………………………………………………………………………………………	42
Figure 2-10 Remove the left cover (1 of 5) ………………………………………………………………………………………….	43

Figure 2-11 Remove the left cover (2 of 5) ………………………………………………………………………………………….	44
Figure 2-12 Remove the left cover (3 of 5) ………………………………………………………………………………………….	44
Figure 2-13 Remove the left cover (4 of 5) ………………………………………………………………………………………….	45
Figure 2-14 Remove the left cover (5 of 5) ………………………………………………………………………………………….	45
Figure 2-15 Remove the right cover (1 of 3) ……………………………………………………………………………………….	46
Figure 2-16 Remove the right cover (2 of 3) ……………………………………………………………………………………….	46
Figure 2-17 Remove the right cover (3 of 3) ……………………………………………………………………………………….	47
Figure 2-18 Remove the cartridge door (1 of 2) …………………………………………………………………………………..	48
Figure 2-19 Remove the cartridge door (2 of 2) …………………………………………………………………………………..	49
Figure 2-20 Remove the face-down cover (1 of 2) ……………………………………………………………………………….	50
Figure 2-21 Remove the face-down cover (2 of 2) ……………………………………………………………………………….	51
Figure 2-22 Remove the rear cover (1 of 2) ………………………………………………………………………………………..	52
Figure 2-23 Remove the rear cover (2 of 2) ………………………………………………………………………………………..	53
Figure 2-24 Remove the formatter PCA (HP LaserJet Professional P1100 Printer series; 1 of 4) ………………	55
Figure 2-25 Remove the formatter PCA (HP LaserJet Professional P1100w Printer series; 2 of 4) ……………	55
Figure 2-26 Remove the formatter PCA (HP LaserJet Professional P1100 Printer series; 3 of 4) ………………	56
Figure 2-27 Remove the formatter PCA (HP LaserJet Professional P1100w Printer series; 4 of 4) ……………	56
Figure 2-28 Remove the wireless PCA ………………………………………………………………………………………………	57
Figure 2-29 Remove the laser/scanner assembly (1 of 4) …………………………………………………………………….	58
Figure 2-30 Remove the laser/scanner assembly (2 of 4) …………………………………………………………………….	59
Figure 2-31 Remove the laser/scanner assembly (3 of 4) …………………………………………………………………….	59
Figure 2-32 Remove the laser/scanner assembly (4 of 4) …………………………………………………………………….	60
Figure 2-33 Reinstall the laser/scanner assembly ……………………………………………………………………………….	60
Figure 2-34 Remove the pickup assembly (1 of 7) ……………………………………………………………………………….	61
Figure 2-35 Remove the pickup assembly (2 of 7) ……………………………………………………………………………….	62
Figure 2-36 Remove the pickup assembly (3 of 7) ……………………………………………………………………………….	62
Figure 2-37 Remove the pickup assembly (4 of 7) ……………………………………………………………………………….	63
Figure 2-38 Remove the pickup assembly (5 of 7) ……………………………………………………………………………….	63
Figure 2-39 Remove the pickup assembly (6 of 7) ……………………………………………………………………………….	64
Figure 2-40 Remove the pickup assembly (7 of 7) ……………………………………………………………………………….	64
Figure 2-41 Reinstall the pickup assembly (1 of 4; correct ground spring position) …………………………………..	65
Figure 2-42 Reinstall the pickup assembly (2 of 4; incorrect ground spring position) ………………………………..	65
Figure 2-43 Reinstall the pickup assembly (3 of 4; lift plate in raised position) …………………………………………	66
Figure 2-44 Reinstall the pickup assembly (4 of 4; lift plate in lowered position) ………………………………………	66
Figure 2-45 Remove the fuser (1 of 7) ……………………………………………………………………………………………….	67
Figure 2-46 Remove the fuser (2 of 7) ……………………………………………………………………………………………….	68
Figure 2-47 Remove the fuser (3 of 7) ……………………………………………………………………………………………….	68
Figure 2-48 Remove the fuser (4 of 7) ……………………………………………………………………………………………….	69
Figure 2-49 Remove the fuser (5 of 7) ……………………………………………………………………………………………….	69
Figure 2-50 Remove the fuser (6 of 7) ……………………………………………………………………………………………….	70
Figure 2-51 Remove the fuser (7 of 7) ……………………………………………………………………………………………….	70
Figure 2-52 Reinstall the fuser; correct wire harness installation ……………………………………………………………	71
Figure 2-53 Reinstall the fuser; incorrect wire harness installation …………………………………………………………	71
Figure 2-54 Remove the main motor (1 of 7) ………………………………………………………………………………………	72

Figure 2-55 Remove the main motor (2 of 7) ………………………………………………………………………………………	73
Figure 2-56 Remove the main motor (3 of 7) ………………………………………………………………………………………	73
Figure 2-57 Remove the main motor (4 of 7) ………………………………………………………………………………………	74
Figure 2-58 Remove the main motor (5 of 7) ………………………………………………………………………………………	74
Figure 2-59 Remove the main motor (6 of 7) ………………………………………………………………………………………	75
Figure 2-60 Remove the main motor (7 of 7) ………………………………………………………………………………………	75
Figure 2-61 Main-motor drive belt: correctly installed …………………………………………………………………………..	76
Figure 2-62 Main-motor drive belt: incorrectly installed …………………………………………………………………………	76
Figure 2-63 Remove the pickup solenoid (1 of 5) ………………………………………………………………………………..	77
Figure 2-64 Remove the pickup solenoid (2 of 5) ………………………………………………………………………………..	78
Figure 2-65 Remove the pickup solenoid (3 of 5) ………………………………………………………………………………..	78
Figure 2-66 Remove the pickup solenoid (4 of 5) ………………………………………………………………………………..	79
Figure 2-67 Remove the pickup solenoid (5 of 5) ………………………………………………………………………………..	79
Figure 2-68 Remove the engine controller PCA (1 of ……………………………………………………………………….	80
Figure 2-69 Remove the engine controller PCA (2 of ……………………………………………………………………….	81
Figure 2-70 Remove the engine controller PCA (3 of ……………………………………………………………………….	81
Figure 2-71 Remove the engine controller PCA (4 of ……………………………………………………………………….	82
Figure 2-72 Remove the engine controller PCA (5 of ……………………………………………………………………….	82
Figure 2-73 Remove the engine controller PCA (6 of ……………………………………………………………………….	83
Figure 2-74 Remove the engine controller PCA (7 of ……………………………………………………………………….	83
Figure 2-75 Remove the engine controller PCA (8 of ……………………………………………………………………….	84
Figure 2-76 Reinstall the engine controller PCA (1 of 4) ……………………………………………………………………….	84
Figure 2-77 Reinstall the engine controller PCA (2 of 4) ……………………………………………………………………….	85
Figure 2-78 Reinstall the engine controller PCA (3 of 4) ……………………………………………………………………….	85
Figure 2-79 Reinstall the engine controller PCA (4 of 4) ……………………………………………………………………….	86
Figure 3-1 Sample engine test page ………………………………………………………………………………………………….	93
Figure 3-2	Plug/jack locations …………………………………………………………………………………………………………..	95
Figure 3-3 Engine controller PCA connectors ……………………………………………………………………………………..	96
Figure 3-4	External view …………………………………………………………………………………………………………………..	97
Figure 3-5 Cross section view …………………………………………………………………………………………………………..	98
Figure 3-6 General timing diagram …………………………………………………………………………………………………….	99
Figure 3-7 Circuit diagram; HP LaserJet Professional P1100 Printer series ………………………………………….	100
Figure 3-8 Circuit diagram; HP LaserJet Professional P1100w Printer series ………………………………………..	101
Figure 4-1	Base product ………………………………………………………………………………………………………………..	139
Figure 4-2	Base model …………………………………………………………………………………………………………………..	140
Figure 4-3	Wireless model ……………………………………………………………………………………………………………..	142
Figure 4-4 Internal assemblies (1 of 3) ……………………………………………………………………………………………..	144
Figure 4-5 Internal assemblies (2 of 3) ……………………………………………………………………………………………..	146
Figure 4-6 Internal assemblies (3 of 3) ……………………………………………………………………………………………..	148
Figure 4-7	PCAs ……………………………………………………………………………………………………………………………	150

1 Theory of operation

●Basic operation

●Formatter-control system

●Engine-control system

●Image-formation system

●Pickup, feed, and delivery system

●Input tray, main-input tray, or priority input slot

Basic operation

Major product systems

The product contains the following major systems:

●Engine-control system

●Laser/scanner system

●Image-formation system

●Pickup-and-feed system

Product block diagram

Figure 1-1 Product block diagram

LASER/SCANNER SYSTEM

ENGINE CONTROL	IMAGE-FORMATION SYSTEM
SYSTEM

PICKUP-AND-FEED SYSTEM

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Sequence of operation

The DC controller in the engine-control system controls the operational sequences of the product. The table below describes durations and operations for each period of a print operation from when the prroduct is turned on until the motor stops rotating.

Normal sequence of operation

Table 1-1 Sequence of operation

Name	Timing	Purpose

WAIT	From the time the power switch is turned on, the door	Brings the product to the ready state. The product
	is closed or the product exits Sleep mode until the	performs the following during the operations:
	product gets ready for a print operation.	● Detects the print cartridge

		● Heats the fuser film in the fuser
		● Rotates, and then stops, the main motor

STBY (standby) From the end of the WAIT or LSTR period until either a print command is sent or the power switch is turned off.

Maintains the product in printable condition. The product performs the following during the operation:

●Enters Auto-Off mode if the Auto-Off command is received

INTR (initial	From the time a print command is received until the
rotation)	paper is picked up.

The product performs the following during the operations:

●Drives the main motor

●Activates the high-voltage power supply

●Activates the laser/scanner

●Warms the fuser heater

PRINT	From the end of the INTR period until the last sheet
	completes the fuser operation.

Forms the image on the photosensitive drum based on the VIDEO signals from the formatter. Transfers and fuses the toner image to the paper.

LSTR (last	From the end of the PRINT period until the main motor
rotation)	stops rotating.

Moves the last printed sheet out of the product. The product performs the following during the operations:

●Stops the main motor

●Deactivates the high-voltage power supply

●Deactivates the laser/scanner

●Deactivates the fuser heater

The product enters the INTR period as the LSTR period is completed, if the formatter sends another print command.

Formatter-control system

The formatter is responsible for the following procedures:

●Controlling sleep mode

●Receiving and processing print data from the various product interfaces

●Monitoring control-panel functions and relaying product-status information (through the control panel and the network or bidirectional interface)

●Developing and coordinating data placement and timing with the DC controller PCA

●Storing font information

●Communicating with the host computer through the network or the bidirectional interface

The formatter receives a print job from the network or bidirectional interface and separates it into image information and instructions that control the printing process. The DC controller PCA synchronizes the image-formation system with the paper-input and -output systems, and then signals the formatter to send the print-image data.

Sleep mode

NOTE: This product uses an Auto-Off feature for sleep mode.

After a user-specified time, the Auto-Off feature automatically conserves electricity by substantially reducing power consumption when the product is not printing. After a user-specified time, the product automatically reduces its power consumption (Auto-Off). The product returns to the ready state when a button is pressed, a print job is received, or a door is opened. When the product is in Auto-Off mode, the control-panel LEDs and the power button backlight LED are off.

NOTE: Although the product lights are off in Auto-Off mode, the product functions normally when it receives a print job.

Input/output

The product receives print data primarily from the following:

●Hi-Speed USB 2.0 port

●802.11b/g wireless networking (wireless models only)

CPU

The formatter incorporates a 400 MHz Helium processor.

Memory

The random access memory (RAM) on the formatter PCA contains the page, I/O buffers, and the font storage area. RAM stores printing and font information received from the host system, and can also serve to temporarily store a full page of print-image data before the data is sent to the print engine.

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Firmware

●HP LaserJet Professional P1100 Printer series

◦The product has 2 MB of Synchronous DRAM, which is used for run-time firmware imaging and specific print job information for the print job.

●HP LaserJet Professional P1100w Printer series

◦The product has 8 MB of Synchronous DRAM, which is used for run-time firmware imaging and specific print job information for the print job.

Memory use

●HP LaserJet Professional P1100 Printer series

◦The product has a 2 KB EEPROM and 64 MB of NAND Flash Memory, which is used for product configuration information and printer driver firmware.

●HP LaserJet Professional P1100w Printer series

◦The product has a 8 KB EEPROM and 64 MB of NAND Flash Memory, which is used for product configuration information and printer driver firmware.

PJL overview

The printer job language (PJL) is an integral part of configuration, in addition to the standard printer command language (PCL). With standard cabling, the product can use PJL to perform a variety of functions such as these:

●Two-way communication with the host computer through a network connection or a USB connection. The product can inform the host about such things as the control-panel settings, and the control-panel settings can be changed from the host.

●Dynamic I/O switching. The product uses this switching to be configured with a host on each I/O. The product can receive data from more than one I/O simultaneously, until the I/O buffer is full. This can occur even when the product is offline.

●Context-sensitive switching. The product can automatically recognize the personality (PS or PCL) of each job and configure itself to serve that personality.

●Isolation of print environment settings from one print job to the next. For example, if a print job is sent to the product in landscape mode, the subsequent print jobs print in landscape mode only if they are formatted for landscape printing.

LEDM overview

NOTE: HP LaserJet Professional P1100w Printer series

The low-end data model (LEDM) provides one consistent data representation method and defines the dynamic and capabilities tickets shared between clients and devices, as well as the access protocol, event, security, and discovery methods.

ACL overview

The advanced control language (ACL) is a language that supports product control and firmware downloads in products that support both PJL/PCL and host-based printing. Each sequence of ACL

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commands must be preceded by a unified exit command (UEL) and an @PJL ENTER LANGUAGE=ACL command. The ACL sequence is always followed by a UEL. Any number of commands can be placed between the UELs. The only exception to these rules is the download command. If a firmware download is done, the download command must be the last command in the sequence. It will not be followed by a UEL.

The firmware searches for the UEL sequence when parsing commands. However, while downloading binary data such as host-based code or NVRAM data the firmware suspends UEL parsing. To handle hosts that “disappear” during binary sequences, the firmware times out all ACL command sessions. If a timeout occurs during a non-download command sequence, it is treated as the receipt of a UEL. If a timeout occurs during firmware download the product resets.

Control panel

The formatter sends and receives product status and command data to and from the control-panel PCA.

Wireless PCA

NOTE: Wireless models only.

The wireless PCA controls the wireless function of the product

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Engine-control system

The engine-control system coordinates all product functions, according to commands that the formatter sends. The engine-control system drives the laser/scanner system, the image-formation system, and the pickup/feed/delivery system.

The engine control system contains the following major components:

●Engine-control unit (ECU)

◦DC controller

◦Low-voltage power supply

●High-voltage power supply

●Fuser control

Figure 1-2 Engine-control system

ENGINE CONTROL SYSTEM

DC controller

Low-voltage power supply

LASER/SCANNER SYSTEM

Formatter

IMAGE-FORMATION SYSTEM

High-voltage power supply

MEDIA-FEED SYSTEM

Fuser control

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Motors, fans, clutches, solenoids, switches, and sensors

Figure 1-3 Motors

Table 1-2 Motors

Description	Components driven

Main motor (M1)	●	Pickup roller
	●	Feed roller
	●	Photosensitive drum
	●	Developing roller
	●	Pressure roller
	●	Delivery roller

Scanner motor (M2)	●	Scanner mirror

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Figure 1-4 Solenoids and clutches

SL1

Table 1-3 Solenoids and clutches

Item	Description

SL1	Pickup solenoid

Figure 1-5 Switches

Table 1-4 Switches

Item	Description

SW501	Cartridge-door switch

SW502	Power switch; not shown

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Figure 1-6	Sensors
	PS702
	PS701
	Single-sheet-feed slot
	(HP LJP P1100w printer Series)
	PS751
Table 1-5 Sensors
Item	Description
PS701	Fuser delivery sensor
PS702	Media width sensor
PS751	Top-of-Page (TOP) sensor
PS901	Main-motor rotation-number sensor; not shown

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DC controller operations

The DC controller controls the operational sequences of the product systems.

Figure 1-7 DC controller block diagram

		Engine controller
AC input
	Low-voltage	Motor
	power supply
Fuser unit
		Solenoid
Transfer roller		Photointerrupter
		DC controller
Cartridge	High-voltage
power supply
	Switch

Laser scanner

Formatter

Operation panel

Table 1-6 DC controller controlled components

Component	Designator	Description

Motor	M1	Main motor

	M2	Scanner motor

Solenoid	SL1	Pickup solenoid

Photointerrupter	PS701	Fuser delivery sensor

	PS702	Media width sensor

	PS751	Top-of-Page (TOP) sensor

	PS901	Main-motor rotation-number sensor

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Table 1-6 DC controller controlled components (continued)

Component	Designator	Description

Switch	SW501	Cartridge-door switch

	SW502	Power switch

Fuser-control circuit

The fuser-control circuit monitors and controls the temperature in the fuser. The product uses ondemand fusing. The fuser-control circuit consists of the following major components:

●Fuser heater (H1); heats the fusing film

●Thermistor (TH1); detects the fuser temperature (contact type)

●Thermal fuse (FU1); prevents abnormal temperature rise in the fuser (contact type)

Figure 1-8 Fuser control circuit

Fuser film

TH1

FU1

Pressure roller

FUSER TEMPERATURE signal

FUSER HEATER CONTROL signal

Fuser heater control	Fuser heater safety
circuit	circuit
Fuser control	DC controller

	Engine controller

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Fuser failure detection

The DC controller determines a fuser unit failure, releases the relay to interrupt power supply to the fuser heater, and notifies the formatter of a failure state when it encounters the following conditions:

●Start up failure

◦If the main thermistor does not detect a specified temperature during the start up process of the heater in the wait period.

◦If the main thermistor does not detect a specified temperature during the heater temperature control in the initial rotation period.

●Abnormal low temperature

◦If the main thermistor detects an abnormal low temperature of the fuser unit during the printing operation.

●Abnormal high temperature

◦If the main thermistor detects an abnormal high temperature of the fuser unit.

●Frequency detection circuit failure

◦If a specified frequency of the FREQUENCY signal is not detected within a specified period after the product is turned on.

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Fuser temperature control

The fuser temperature control maintains the temperature of the fuser heater at its targeted temperature.

The DC controller monitors the FIXING TEMPERATURE (FSRTH) signals and sends the FIXING HEATER CONTROL (FSRD) signal according to the detected temperature. The fuser heater control circuit controls the fuser heater depending on the signal so that the heater remains at the targeted temperature.

Figure 1-9 Fuser-heater control circuit

AC input

			Fixing control

		Frequency detection	FREQSNS

		circuit

		(220-240V model only)

RL101	Relay control	Fuser heater	RLYD
circuit	safety circuit

Fuser heater			FSRD
control circuit
			FSRTH
FU1	TH1
	H1

Fuser film unit

Engine controller

DC controller

Pressure roller

Fuser unit

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Fuser protective function

The protective function detects an abnormal temperature rise of the fuser unit and interrupts power supply to the fuser heater.

The following three protective components prevent an abnormal temperature rise of the fuser heater:

●DC controller

◦The DC controller interrupts power supply to the fuser heater when it detects an abnormal temperature of the fuser heater.

●Fuser heater safety circuit

◦The fuser heater safety circuit interrupts power supply to the fuser heater when the detected temperature of the main thermistor is abnormal.

●Thermal fuse

◦The contact of the thermal fuse is broken to interrupt power supply to the fuser heater when the thermal fuse detects an abnormal temperature of the fuser heater.

Pressure roller cleaning

The pressure roller cleaning process is initiated by the formatter. The process removes toner that has accumulated on the pressure roller by transferring it to a sheet of paper.

●The product feeds a sheet of paper after receiving the cleaning command from the formatter.

●Main motor rotation is stopped when the trailing edge of the paper passes through the transfer roller.

●The main motor rotation is repeatedly started and then stopped. The fuser heater is turned on and then off at the same interval as main motor rotation.

●Toner adhered to the pressure roller is fused to the paper.

●The paper is ejected from the product.

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Low-voltage power supply

The low-voltage power supply (LVPS) converts ac input voltage to dc voltage. The LVPS has two fuses on the PCA. The LVPS 24 V output is interrupted to the fuser and the high-voltage power supply if the cartridge-door interlock switch (SW501) is in the off position (cover open).

WARNING! The product power switch only interrupts dc voltage from the LVPS. The ac voltage is present in the product when the power cord is plugged into a power receptacle and the power switch is in the off position. You must unplug the product power cord before servicing the product.

Figure 1-10 Low-voltage power supply (LVPS)

AC input

	Engine controller
	Low-voltage power supply		DC controller
		Fuser unit
	Fuse (FU101)
Fuse (FU201)
	Cartridge-door switch	High-voltage
	(SW501)	power supply
	+24U
Rectifying
circuit
	Frequency	FREQSNS
	detection circuit

	(220-240V model only)
+24V			BSTSIG

generation			+24V
circuit
	+24V ON/OFF		24VON
		+24P
	circuit

	+5V		+5V
Protection	generation
	+5R
circuit	circuit

	+3.3V		+3.3V
	generation

	circuit
			+3.3VON
	+3.3V ON/OFF	+3.3UON
		circuit	+3.3U
		+3.3R
	Formatter	Power switch
			(SW502)

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Overcurrent/overvoltage protection

The low-voltage power supply has a protective function against overcurrent and overvoltage to prevent failures in the power supply circuit. If an overcurrent or overvoltage condition occurs, the system automatically cuts off the output voltage.

If the dc power is not being supplied from the low-voltage power supply, the protective function might be running. In such case, turn off the power switch and unplug the power cord. Do not plug in the power cord or turn on the power switch again until the cause is found.

WARNING! If you believe the overcurrent or overvoltage protection circuits have been activated, do not plug in the product power cord or turn on the product power until the cause of the failure is found and corrected.

In addition, two fuses in the low-voltage power supply protect against overcurrent. If overcurrent flows into the ac line, the fuses melt and cut off the power distribution.

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High-voltage power supply

The high-voltage power supply (HVPS) applies biases to the following components:

●Primary charging roller

●Developing roller

●Transfer roller

Figure 1-11 High-voltage power supply

Engine controller

DC controller

High-voltage power supply

Primary charging bias circuit

To primary charging roller

Developing To developing roller bias circuit

Cartridge

Transfer bias	Photosensitive drum
circuit	Transfer roller

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Laser/scanner system

The laser/scanner system receives VIDEO signals from the ECU and formatter and converts the signals into latent images on the photosensitive drum.

The main components of the laser/scanner are the laser unit and the scanner motor unit. The DC controller sends signals to the laser/scanner to control the functions of these components.

Figure 1-12 Laser/scanner system

BD sensor	Photosensitive drum

Laser unit

Scanning mirror

Scanner motor unit

BDI signal	VIDEO signal	LASER CONTROL signal	SCANNER MOT OR CONTROL signal
			DC controller
			Engine controller
			Formatter

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Laser failure detection

The DC controller determines an optical unit failure and notifies the formatter, if the laser/scanner encounters the following conditions:

●The scanner motor does not reach a specified rotation within a specified period of the scanner motor start up.

●The rotation of the scanner motor is out of specified range for a specified period during the scanner motor drive.

●The BD interval is out of a specified value during a print operation.

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Image-formation system

Electrophotographic process

The electrophotographic process forms an image on the paper. Following are the major components used in the process:

●Print cartridge

●Transfer roller

●Fuser

●Laser/scanner

●High-voltage power supply

The DC controller uses the laser/scanner and HVPS to form the toner image on the photosensitive drum. The image is transferred to the paper and then fused onto the paper.

Figure 1-13 Electrophotographic process block diagram (1 of 2)

Transfer roller

Cartridge

Laser scanner

High-voltage power supply

DC controller

Engine controller

The DC controller rotates the main motor to drive the following components:

●Photosensitive drum

●Developing drum

●Primary charging roller (follows the rotation of the photosensitive drum)

●Transfer roller (follows the rotation of the photosensitive drum)

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Figure 1-14 Electrophotographic process block diagram (2 of 2)

Primary charging roller
Developing roller	Main motor

Cartridge

Transfer roller

Photosensitive drum

DC controller

Engine controller

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Image formation process

Each of the following process function independently and must be coordinated with the other product processes. Image formation consists of the following processes:

●Latent-image formation block

◦Step 1: primary charging

◦Step 2: laser-beam exposure

●Developing block

◦Step 3: developing

●Transfer block

◦Step 4: transfer

◦Step 5: separation

●Fusing block

◦Step 6: fusing

●Drum cleaning block

◦Step 7: drum cleaning

Figure 1-15 Image formation process

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Latent-image formation stage

During the latent-image formation stage, the laser/scanner forms an invisible image on the photosensitive drum in the print cartridge.

Primary charging

Step 1: dc and ac biases are applied to the primary charging roller, which transfers a uniform negative potential to the photosensitive drum.

Figure 1-16 Primary charging

Primary charging roller

DC bias

Photosensitive drum

Laser beam exposure

Step 2: The laser beam scans the photosensitive drum to neutralize negative charges on parts of the drum surface. An electrostatic latent image is formed on the drum where negative charges were neutralized.

Figure 1-17 Laser beam exposure

Laser beam

Unexposed area

Exposed area

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Developing stage

Print cartridge

Step 3: In the print cartridge, the developing cylinder transfers toner onto the electrostatic latent image on the photosensitive drum.

Figure 1-18 Print cartridge

Blade
	Developing cylinder
Exposed area	Unexposed area	AC bias

Unexposed area	Exposed area
		DC bias

Photosensitive drum

Toner acquires a negative charge from the friction that occurs when the developing roller rotates against the developing blade. The developing bias is applied to the developing roller to make a potential difference between the developing roller and the photosensitive drum. The negatively charged toner is attracted to the latent image on the photosensitive drum because the drum surface has a higher potential.

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Transfer stage

Step 4: The transfer charging roller, to which a DC positive bias is applied, imparts a positive charge on the paper. When the paper comes in contact with the photosensitive drum, the toner is transferred to the paper.

Figure 1-19 Transfer

Photosensitive

drum

Media

Transfer roller

DC bias

Step 5: The elasticity of the paper causes its separation from the photosensitive drum. A static charge eliminator aids separation by weakening any electrostatic adhesion.

Figure 1-20 Separation

Photosensitive

drum

Media

Static charge eliminator

Transfer roller

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Fusing stage

Step 6: The DC negative bias applied to the fusing film strengthens the holding force of the toner on the paper and prevents the toner from scattering.

The product uses an on-demand fuser method. The toner image is permanently affixed to the paper by heat and pressure.

Figure 1-21 Fusing

Fuser heater

Fuser film

Toner

Media

Pressure roller

Cleaning stage

Step 7: The cleaning blade scrapes the residual toner off of the photosensitive drum and deposits it into the waste toner case.

Figure 1-22 Drum cleaning

Cleaning blade

Photosensitive

Waste toner container

drum

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Pickup, feed, and delivery system

The media feed system picks up, feeds, and delivers the page.

Figure 1-23 Pickup, feed, and delivery system block diagram

Delivery roller

	Pressure roller
	Fuser film
	Transfer roller
	Photosensitive drum	Single-sheet-feed slot
	(HP LJP P1100w printer Series)

Feed roller

Pickup roller

Separation pad

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Photo sensors and switches

NOTE: The illustration in this section also shows the product motor and solenoid. The power switch is not shown.

Figure 1-24 Photo sensors, motor, and solenoid

PS702

PS701

PS751

Single-sheet-feed slot

(HP LJP P1100w printer Series)

Table 1-7 Photo sensors, motor, and solenoid

Item	Description

M1	Main motor

SL1	Pickup solenoid

PS701	Fuser delivery sensor

PS702	Media-width sensor

PS751	TOP sensor

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Input tray, main-input tray, or priority input slot

NOTE: The HP LaserJet Professional P1100 Printer series has a single input tray. The HP LaserJet Professional P1100w Printer series has a main-input tray and a priority input slot.

Jam detection

The product uses the following sensors to detect the presence of paper and to check for jams. The paper must pass each sensor within a specified time.

NOTE: To find the following components, see Photo sensors and switches on page 29.

●PS701; fuser delivery sensor

●PS702; TOP sensor

NOTE: The product automatically ejects paper if the TOP sensor detects residual paper within the product when the power is turned on or the door is closed.

The product detects the following jams:

●Pickup stationary jam

●Delivery delay jam

●Delivery stationary jam

●Fuser wrapping jam

●Door open jam

●Residual media jam

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2 Removal and replacement

●Introduction

●Removal and replacement strategy

●Electrostatic discharge

●Required tools

●Before performing service

●After performing service

●Post-service test

●Parts removal order

●Pickup roller

●Separation pad

●Transfer roller

●Covers

●Main assemblies

Introduction

This chapter describes the removal and replacement of field-replaceable units (FRUs) only.

Replacing FRUs is generally the reverse of removal. Occasionally, notes and tips are included to provide directions for difficult or critical replacement procedures.

HP does not support repairing individual subassemblies or troubleshooting to the component level.

Note the length, diameter, color, type, and location of each screw. Be sure to return each screw to its original location during reassembly.

Incorrectly routed or loose wire harnesses can interfere with other internal components and can become damaged or broken. Frayed or pinched harness wires can be difficult to find. When replacing wire harnesses, always use the provided wire loops, lance points, or wire-harness guides and retainers.

Removal and replacement strategy

WARNING! Turn the product off, wait 5 seconds, and then remove the power cord before attempting to service the product. If this warning is not followed, severe injury can result, in addition to damage to the product. The power must be on for certain functional checks during troubleshooting. However, disconnect the power supply during parts removal.

Never operate or service the product with the protective cover removed from the laser/scanner assembly. The reflected beam, although invisible, can damage your eyes.

The sheet-metal parts can have sharp edges. Be careful when handling sheet-metal parts.

CAUTION: Do not bend or fold the flat flexible cables (FFCs) during removal or installation. Also, do not straighten pre-folds in the FFCs. You must fully seat all FFCs in their connectors. Failure to fully seat an FFC into a connector can cause a short circuit in a PCA.

NOTE: To install a self-tapping screw, first turn it counterclockwise to align it with the existing thread pattern, and then carefully turn it clockwise to tighten. Do not overtighten. If a self-tapping screw-hole becomes stripped, repair the screw-hole or replace the affected assembly.

TIP: For clarity, some photos in this chapter show components removed that would not be removed to service the product. If necessary, remove the components listed at the beginning of a procedure before proceeding to service the product.

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Loading…

Contents:

1. Theory of operation;
    Basic operation;
    Formatter-control system;
    Engine-control system;
    Image-formation system;
    Pickup, feed, and delivery system;
    Input tray, main-input tray, or priority input slot;
2. Removal and replacement;
3. Solve problems;
4. Parts and diagrams;
Appendix A. Service and support;
Appendix B. Specifications;
Appendix C. Regulatory information;
Index.

Download HP LaserJet P1100 Series Printer. Service Manual

Formatter-control system HP P1100 P1102

The formatter is responsible for the following procedures:

Controlling sleep mode
Receiving and processing print data from the various product interfaces
Monitoring control-panel functions and relaying product-status information (through the control panel and the network or bidirectional interface)
Developing and coordinating data placement and timing with the DC controller PCA
Storing font information
Communicating with the host computer through the network or the bidirectional interface

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Серия принтеров

LASERJET PROFESSIONAL

P1100

Руководство пользователя

www.hp.com/support/ljp1100series

Источник

LASERJET PROFESSIONAL P1100

SERIES PRINTER

Service Manual

www.hp.com/support/ljp1100series

HP LaserJet Professional P1100 Printer series

Service Manual

Development Company, L.P.

Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws.

The information contained herein is subject to change without notice.

Part number: CE651-90953

Edition 1, 4/2010

Trademark Credits

Microsoft®, Windows®, Windows® XP, and Windows Vista® are U.S. registered trademarks of Microsoft Corporation.

Conventions used in this guide

TIP: Tips provide helpful hints or shortcuts.

NOTE: Notes provide important information to explain a concept or to complete a task.

CAUTION: Cautions indicate procedures that you should follow to avoid losing data or damaging the product.

WARNING! Warnings alert you to specific procedures that you should follow to avoid personal injury, catastrophic loss of data, or extensive damage to the product.

iv Conventions used in this guide

ENWW

Table of contents

1 Theory of operation ……………………………………………………………………………………………………………………….	1
Basic operation …………………………………………………………………………………………………………………….	2
Major product systems ……………………………………………………………………………………………	2
Product block diagram ……………………………………………………………………………………………	2
Sequence of operation ……………………………………………………………………………………………	3
Normal sequence of operation ………………………………………………………………….	3
Formatter-control system ………………………………………………………………………………………………………	4
Sleep mode …………………………………………………………………………………………………………..	4
Input/output …………………………………………………………………………………………………………..	4
CPU …………………………………………………………………………………………………………………….	4
Memory ………………………………………………………………………………………………………………..	4
Firmware ……………………………………………………………………………………………….	5
Memory use …………………………………………………………………………………………..	5
PJL overview ………………………………………………………………………………………………………..	5
LEDM overview ……………………………………………………………………………………………………..	5
ACL overview ………………………………………………………………………………………………………..	5
Control panel ………………………………………………………………………………………………………..	6
Wireless PCA ………………………………………………………………………………………………………..	6
Engine-control system …………………………………………………………………………………………………………..	7
Motors, fans, clutches, solenoids, switches, and sensors ……………………………………………	8
DC controller operations ……………………………………………………………………………………….	11
Fuser-control circuit ……………………………………………………………………………………………..	12
Fuser failure detection ……………………………………………………………………………	13
Fuser temperature control ………………………………………………………………………	14
Fuser protective function ………………………………………………………………………..	15
Pressure roller cleaning …………………………………………………………………………	15
Low-voltage power supply …………………………………………………………………………………….	16
Overcurrent/overvoltage protection ………………………………………………………….	17
High-voltage power supply ……………………………………………………………………………………	18
Laser/scanner system …………………………………………………………………………………………..	19
Laser failure detection ……………………………………………………………………………	20
Image-formation system ………………………………………………………………………………………………………	21
Electrophotographic process …………………………………………………………………………………	21
Image formation process ………………………………………………………………………………………	23

Latent-image formation stage …………………………………………………………………	24
Primary charging ……………………………………………………………………	24
Laser beam exposure ……………………………………………………………..	24
Developing stage ………………………………………………………………………………….	25
Print cartridge ………………………………………………………………………..	25
Transfer stage ………………………………………………………………………………………	26
Fusing stage ………………………………………………………………………….	27
Cleaning stage ……………………………………………………………………….	27
Pickup, feed, and delivery system …………………………………………………………………………………………	28
Photo sensors and switches ………………………………………………………………………………….	29
Input tray, main-input tray, or priority input slot ……………………………………………………………………….	30
Jam detection ……………………………………………………………………………………………………..	30
2 Removal and replacement ……………………………………………………………………………………………………………	31
Introduction ………………………………………………………………………………………………………………………..	32
Removal and replacement strategy ………………………………………………………………………………………	32
Electrostatic discharge ………………………………………………………………………………………………………..	33
Required tools …………………………………………………………………………………………………………………..	33
Before performing service ……………………………………………………………………………………………………	34
After performing service ………………………………………………………………………………………………………	34
Post-service test …………………………………………………………………………………………………………………	35
Print-quality test …………………………………………………………………………………………………..	35
Parts removal order …………………………………………………………………………………………………………….	36
Pickup roller ……………………………………………………………………………………………………………………….	37
Separation pad …………………………………………………………………………………………………………………..	38
Transfer roller …………………………………………………………………………………………………………………….	39
Covers ………………………………………………………………………………………………………………………………	40
Input tray or main-input tray …………………………………………………………………………………..	40
Output bin tray extension ………………………………………………………………………………………	41
Front cover ………………………………………………………………………………………………………….	42
Remove the front cover ………………………………………………………………………….	42
Left cover ……………………………………………………………………………………………………………	43
Remove the left cover ……………………………………………………………………………	43
Right cover ………………………………………………………………………………………………………….	46
Remove the right cover ………………………………………………………………………….	46
Cartridge door ……………………………………………………………………………………………………..	48
Remove the cartridge door ……………………………………………………………………..	48
Face-down cover …………………………………………………………………………………………………	50
Remove the face-down cover …………………………………………………………………	50
Rear cover ………………………………………………………………………………………………………….	52
Remove the rear cover …………………………………………………………………………..	52
Main assemblies …………………………………………………………………………………………………………………	54
Formatter PCA …………………………………………………………………………………………………….	54

Remove the formatter PCA …………………………………………………………………….	55
Wireless PCA ………………………………………………………………………………………………………	57
Remove the wireless PCA ……………………………………………………………………..	57
Laser/scanner assembly ……………………………………………………………………………………….	58
Remove the laser/scanner assembly ……………………………………………………….	58
Reinstall the laser/scanner assembly ……………………………………………………….	60
Pickup assembly ………………………………………………………………………………………………….	61
Remove the pickup assembly …………………………………………………………………	61
Reinstall the pickup assembly …………………………………………………………………	65
Fuser ………………………………………………………………………………………………………………….	67
Remove the fuser ………………………………………………………………………………….	67
Reinstall the fuser …………………………………………………………………………………	71
Main motor ………………………………………………………………………………………………………….	72
Remove the main motor …………………………………………………………………………	72
Reinstall the main-motor drive belt …………………………………………………………..	76
Pickup solenoid ……………………………………………………………………………………………………	77
Remove the pickup solenoid …………………………………………………………………..	77
Engine controller PCA ………………………………………………………………………………………….	80
Remove the engine controller PCA ………………………………………………………….	80
Reinstall the engine controller PCA …………………………………………………………	84
3 Solve problems ……………………………………………………………………………………………………………………………	87
Solve problems checklist ……………………………………………………………………………………………………..	88
Troubleshooting process ……………………………………………………………………………………………………..	91
Determine the problem source ……………………………………………………………………………..	91
Power subsystem ………………………………………………………………………………………………..	92
Power-on checks …………………………………………………………………………………..	92
Tools for troubleshooting ……………………………………………………………………………………………………..	93
Individual component diagnostics …………………………………………………………………………..	93
Engine diagnostics ………………………………………………………………………………..	93
Engine-test button ………………………………………………………………….	93
Components tests …………………………………………………………………………………	94
Drum rotation functional check ………………………………………………..	94
Half self-test functional check …………………………………………………..	94
Diagrams ……………………………………………………………………………………………………………	95
Plug/jack locations ………………………………………………………………………………..	95
Location of connectors …………………………………………………………………………..	96
Locations of major components ………………………………………………………………	97
General timing charts …………………………………………………………………………….	99
General circuit diagram ………………………………………………………………………..	100
Internal print-quality test pages …………………………………………………………………………….	102
Cleaning page …………………………………………………………………………………….	102
Configuration page ………………………………………………………………………………	102

Print-quality troubleshooting tools …………………………………………………………………………	103
Repetitive defect ruler ………………………………………………………………………….	103
Interpret control-panel light patterns ……………………………………………………………………..	103
Clear jams ……………………………………………………………………………………………………………………….	107
Common causes of jams …………………………………………………………………………………….	107
Jam locations …………………………………………………………………………………………………….	108
Clear jams from the input tray ………………………………………………………………………………	109
Clear jams from the output areas …………………………………………………………………………	111
Clear jams from inside the product ……………………………………………………………………….	113
Solve repeated jams …………………………………………………………………………………………..	114
Change jam recovery …………………………………………………………………………………………	114
Solve paper-handling problems …………………………………………………………………………………………..	116
Solve image-quality problems …………………………………………………………………………………………….	117
Image defect table ……………………………………………………………………………………………..	117
Light print or faded ………………………………………………………………………………	117
Toner specks ………………………………………………………………………………………	117
Dropouts …………………………………………………………………………………………….	118
Vertical lines ……………………………………………………………………………………….	118
Gray background …………………………………………………………………………………	118
Toner smear ……………………………………………………………………………………….	118
Loose toner ………………………………………………………………………………………..	119
Vertical repetitive defects ……………………………………………………………………..	119
Misformed characters …………………………………………………………………………..	119
Page skew ………………………………………………………………………………………….	119
Curl or wave ……………………………………………………………………………………….	120
Wrinkles or creases ……………………………………………………………………………..	120
Toner scatter outline ……………………………………………………………………………	120
Moisture …………………………………………………………………………………………….	121
Optimize and improve image quality ……………………………………………………………………..	122
Change print density ……………………………………………………………………………	122
Clean the product ……………………………………………………………………………………………………………..	123
Clean the pickup roller ………………………………………………………………………………………..	123
Clean the paper path ………………………………………………………………………………………….	124
Clean the print-cartridge area ………………………………………………………………………………	126
Clean the exterior ………………………………………………………………………………………………	128
Solve performance problems ……………………………………………………………………………………………..	129
Solve connectivity problems ……………………………………………………………………………………………….	130
Solve direct-connect problems …………………………………………………………………………….	130
Solve wireless problems ……………………………………………………………………………………..	130
Service mode functions ……………………………………………………………………………………………………..	132
Product resets ……………………………………………………………………………………………………	132
Product updates ……………………………………………………………………………………………………………….	133

4 Parts and diagrams …………………………………………………………………………………………………………………….	135
Order parts by authorized service providers …………………………………………………………………………	136
Order parts, accessories, and supplies …………………………………………………………………	136
Related documentation and software ……………………………………………………………………	136
Supplies part numbers ………………………………………………………………………………………..	136
Customer self repair parts …………………………………………………………………………………..	137
Service parts ……………………………………………………………………………………………………..	137
Whole-unit replacement part numbers …………………………………………………………………..	137
How to use the parts lists and diagrams ………………………………………………………………………………	138
Assembly locations ……………………………………………………………………………………………………………	139
Base product ……………………………………………………………………………………………………..	139
Covers …………………………………………………………………………………………………………………………….	140
Base model ……………………………………………………………………………………………………….	140
Wireless model ………………………………………………………………………………………………….	142
Internal assemblies …………………………………………………………………………………………………………..	144
Internal assemblies (1 of 3) …………………………………………………………………………………	144
Internal assemblies (2 of 3) …………………………………………………………………………………	146
Internal assemblies (3 of 3) …………………………………………………………………………………	148
PCAs ………………………………………………………………………………………………………………………………	150
Alphabetical parts list ………………………………………………………………………………………………………..	152
Numerical parts list ……………………………………………………………………………………………………………	155
Appendix A Service and support …………………………………………………………………………………………………..	159
Hewlett-Packard limited warranty statement …………………………………………………………………………	160
HP’s Premium Protection Warranty: LaserJet print cartridge limited warranty statement …………….	161
End User License Agreement …………………………………………………………………………………………….	162
Customer self-repair warranty service ………………………………………………………………………………….	164
Customer support ……………………………………………………………………………………………………………..	164
Repack the product …………………………………………………………………………………………………………..	165
Service information form ……………………………………………………………………………………………………	166
Appendix B Specifications …………………………………………………………………………………………………………….	167
Physical specifications ………………………………………………………………………………………………………	168
Power consumption …………………………………………………………………………………………………………..	168
Acoustic specifications ………………………………………………………………………………………………………	168
Environmental specifications ………………………………………………………………………………………………	169
Appendix C Regulatory information ………………………………………………………………………………………………	171
FCC regulations ……………………………………………………………………………………………………………….	172
Declaration of conformity (base models) ………………………………………………………………………………	173
Declaration of conformity (wireless models) ………………………………………………………………………….	174
Certificate of Volatility ………………………………………………………………………………………………………..	175
Safety statements ……………………………………………………………………………………………………………..	177

Laser safety ………………………………………………………………………………………………………	177
Canadian DOC regulations ………………………………………………………………………………….	177
VCCI statement (Japan) ……………………………………………………………………………………..	177
Power cord instructions ………………………………………………………………………………………	177
Power cord statement (Japan) ……………………………………………………………………………..	177
EMC statement (Korea) ………………………………………………………………………………………	177
Laser statement for Finland …………………………………………………………………………………	178
GS statement (Germany) …………………………………………………………………………………….	178
Substances Table (China) …………………………………………………………………………………..	179
Additional statements for wireless products ………………………………………………………………………….	180
FCC compliance statement—United States …………………………………………………………..	180
Australia statement …………………………………………………………………………………………….	180
Brazil ANATEL statement ……………………………………………………………………………………	180
Canadian statements ………………………………………………………………………………………….	180
European Union regulatory notice ………………………………………………………………………..	180
Notice for use in France ………………………………………………………………………………………	181
Notice for use in Russia ………………………………………………………………………………………	181
Korean statement ………………………………………………………………………………………………	181
Taiwan statement ………………………………………………………………………………………………	181
Index ……………………………………………………………………………………………………………………………………………..	183

List of tables

Table 1-1 Sequence of operation ………………………………………………………………………………………………………..	3
Table 1-2	Motors ………………………………………………………………………………………………………………………………	8
Table 1-3 Solenoids and clutches ……………………………………………………………………………………………………….	9
Table 1-4	Switches ……………………………………………………………………………………………………………………………	9
Table 1-5	Sensors …………………………………………………………………………………………………………………………..	10
Table 1-6 DC controller controlled components …………………………………………………………………………………..	11
Table 1-7 Photo sensors, motor, and solenoid ……………………………………………………………………………………	29
Table 3-1 Basic problem solving ……………………………………………………………………………………………………….	88
Table 3-2	Status-light legend ………………………………………………………………………………………………………….	103
Table 3-3 Control-panel light patterns ………………………………………………………………………………………………	104
Table 4-1 Order parts, accessories, and supplies ………………………………………………………………………………	136
Table 4-2 Related documentation and software ………………………………………………………………………………..	136
Table 4-3 Supplies part numbers …………………………………………………………………………………………………….	136
Table 4-4 Customer replaceable units (CRU) kit part numbers ……………………………………………………………	137
Table 4-5 Whole-unit replacement part numbers ……………………………………………………………………………….	137
Table 4-6	Base product ………………………………………………………………………………………………………………….	139
Table 4-7	Base model ……………………………………………………………………………………………………………………	141
Table 4-8	Wireless model ……………………………………………………………………………………………………………….	143
Table 4-9 Internal assemblies (1 of 3) ………………………………………………………………………………………………	145
Table 4-10 Internal assemblies (2 of 3) …………………………………………………………………………………………….	147
Table 4-11 Internal assemblies (3 of 3) …………………………………………………………………………………………….	149
Table 4-12	PCAs …………………………………………………………………………………………………………………………..	151
Table 4-13 Alphabetical parts list …………………………………………………………………………………………………….	152
Table 4-14 Numerical parts list ………………………………………………………………………………………………………..	155
Table B-1	Physical specifications1 ……………………………………………………………………………………………………	168
Table B-2 HP LaserJet Professional P1100 Printer series (average in watts)123 …………………………………….	168
Table B-3 HP LaserJet Professional P1100 Printer series12 ………………………………………………………………..	168
Table B-4	Environmental specifications ……………………………………………………………………………………………	169

List of figures

Figure 1-1 Product block diagram ……………………………………………………………………………………………………….	2
Figure 1-2	Engine-control system ……………………………………………………………………………………………………….	7
Figure 1-3	Motors ……………………………………………………………………………………………………………………………..	8
Figure 1-4 Solenoids and clutches ………………………………………………………………………………………………………	9
Figure 1-5	Switches ………………………………………………………………………………………………………………………….	9
Figure 1-6	Sensors ………………………………………………………………………………………………………………………….	10
Figure 1-7 DC controller block diagram ………………………………………………………………………………………………	11
Figure 1-8 Fuser control circuit ………………………………………………………………………………………………………….	12
Figure 1-9 Fuser-heater control circuit ……………………………………………………………………………………………….	14
Figure 1-10 Low-voltage power supply (LVPS) ……………………………………………………………………………………	16
Figure 1-11 High-voltage power supply ………………………………………………………………………………………………	18
Figure 1-12	Laser/scanner system …………………………………………………………………………………………………….	19
Figure 1-13 Electrophotographic process block diagram (1 of 2) …………………………………………………………..	21
Figure 1-14 Electrophotographic process block diagram (2 of 2) …………………………………………………………..	22
Figure 1-15 Image formation process ………………………………………………………………………………………………..	23
Figure 1-16	Primary charging ……………………………………………………………………………………………………………	24
Figure 1-17 Laser beam exposure …………………………………………………………………………………………………….	24
Figure 1-18	Print cartridge ………………………………………………………………………………………………………………..	25
Figure 1-19	Transfer ………………………………………………………………………………………………………………………..	26
Figure 1-20	Separation …………………………………………………………………………………………………………………….	26
Figure 1-21	Fusing ………………………………………………………………………………………………………………………….	27
Figure 1-22	Drum cleaning ……………………………………………………………………………………………………………….	27
Figure 1-23 Pickup, feed, and delivery system block diagram ……………………………………………………………….	28
Figure 1-24 Photo sensors, motor, and solenoid …………………………………………………………………………………	29
Figure 2-1 Phillips and pozidrive screwdriver comparison …………………………………………………………………….	33
Figure 2-2 Parts removal order …………………………………………………………………………………………………………	36
Figure 2-3 Remove the pickup roller (1 of 2) ……………………………………………………………………………………….	37
Figure 2-4 Remove the pickup roller (2 of 2) ……………………………………………………………………………………….	37
Figure 2-5 Remove the separation pad assembly ……………………………………………………………………………….	38
Figure 2-6 Remove the transfer roller ………………………………………………………………………………………………..	39
Figure 2-7 Remove the tray ………………………………………………………………………………………………………………	40
Figure 2-8 Remove the output bin tray extension ………………………………………………………………………………..	41
Figure 2-9 Remove the front cover ……………………………………………………………………………………………………	42
Figure 2-10 Remove the left cover (1 of 5) ………………………………………………………………………………………….	43

Figure 2-11 Remove the left cover (2 of 5) ………………………………………………………………………………………….	44
Figure 2-12 Remove the left cover (3 of 5) ………………………………………………………………………………………….	44
Figure 2-13 Remove the left cover (4 of 5) ………………………………………………………………………………………….	45
Figure 2-14 Remove the left cover (5 of 5) ………………………………………………………………………………………….	45
Figure 2-15 Remove the right cover (1 of 3) ……………………………………………………………………………………….	46
Figure 2-16 Remove the right cover (2 of 3) ……………………………………………………………………………………….	46
Figure 2-17 Remove the right cover (3 of 3) ……………………………………………………………………………………….	47
Figure 2-18 Remove the cartridge door (1 of 2) …………………………………………………………………………………..	48
Figure 2-19 Remove the cartridge door (2 of 2) …………………………………………………………………………………..	49
Figure 2-20 Remove the face-down cover (1 of 2) ……………………………………………………………………………….	50
Figure 2-21 Remove the face-down cover (2 of 2) ……………………………………………………………………………….	51
Figure 2-22 Remove the rear cover (1 of 2) ………………………………………………………………………………………..	52
Figure 2-23 Remove the rear cover (2 of 2) ………………………………………………………………………………………..	53
Figure 2-24 Remove the formatter PCA (HP LaserJet Professional P1100 Printer series; 1 of 4) ………………	55
Figure 2-25 Remove the formatter PCA (HP LaserJet Professional P1100w Printer series; 2 of 4) ……………	55
Figure 2-26 Remove the formatter PCA (HP LaserJet Professional P1100 Printer series; 3 of 4) ………………	56
Figure 2-27 Remove the formatter PCA (HP LaserJet Professional P1100w Printer series; 4 of 4) ……………	56
Figure 2-28 Remove the wireless PCA ………………………………………………………………………………………………	57
Figure 2-29 Remove the laser/scanner assembly (1 of 4) …………………………………………………………………….	58
Figure 2-30 Remove the laser/scanner assembly (2 of 4) …………………………………………………………………….	59
Figure 2-31 Remove the laser/scanner assembly (3 of 4) …………………………………………………………………….	59
Figure 2-32 Remove the laser/scanner assembly (4 of 4) …………………………………………………………………….	60
Figure 2-33 Reinstall the laser/scanner assembly ……………………………………………………………………………….	60
Figure 2-34 Remove the pickup assembly (1 of 7) ……………………………………………………………………………….	61
Figure 2-35 Remove the pickup assembly (2 of 7) ……………………………………………………………………………….	62
Figure 2-36 Remove the pickup assembly (3 of 7) ……………………………………………………………………………….	62
Figure 2-37 Remove the pickup assembly (4 of 7) ……………………………………………………………………………….	63
Figure 2-38 Remove the pickup assembly (5 of 7) ……………………………………………………………………………….	63
Figure 2-39 Remove the pickup assembly (6 of 7) ……………………………………………………………………………….	64
Figure 2-40 Remove the pickup assembly (7 of 7) ……………………………………………………………………………….	64
Figure 2-41 Reinstall the pickup assembly (1 of 4; correct ground spring position) …………………………………..	65
Figure 2-42 Reinstall the pickup assembly (2 of 4; incorrect ground spring position) ………………………………..	65
Figure 2-43 Reinstall the pickup assembly (3 of 4; lift plate in raised position) …………………………………………	66
Figure 2-44 Reinstall the pickup assembly (4 of 4; lift plate in lowered position) ………………………………………	66
Figure 2-45 Remove the fuser (1 of 7) ……………………………………………………………………………………………….	67
Figure 2-46 Remove the fuser (2 of 7) ……………………………………………………………………………………………….	68
Figure 2-47 Remove the fuser (3 of 7) ……………………………………………………………………………………………….	68
Figure 2-48 Remove the fuser (4 of 7) ……………………………………………………………………………………………….	69
Figure 2-49 Remove the fuser (5 of 7) ……………………………………………………………………………………………….	69
Figure 2-50 Remove the fuser (6 of 7) ……………………………………………………………………………………………….	70
Figure 2-51 Remove the fuser (7 of 7) ……………………………………………………………………………………………….	70
Figure 2-52 Reinstall the fuser; correct wire harness installation ……………………………………………………………	71
Figure 2-53 Reinstall the fuser; incorrect wire harness installation …………………………………………………………	71
Figure 2-54 Remove the main motor (1 of 7) ………………………………………………………………………………………	72

Figure 2-55 Remove the main motor (2 of 7) ………………………………………………………………………………………	73
Figure 2-56 Remove the main motor (3 of 7) ………………………………………………………………………………………	73
Figure 2-57 Remove the main motor (4 of 7) ………………………………………………………………………………………	74
Figure 2-58 Remove the main motor (5 of 7) ………………………………………………………………………………………	74
Figure 2-59 Remove the main motor (6 of 7) ………………………………………………………………………………………	75
Figure 2-60 Remove the main motor (7 of 7) ………………………………………………………………………………………	75
Figure 2-61 Main-motor drive belt: correctly installed …………………………………………………………………………..	76
Figure 2-62 Main-motor drive belt: incorrectly installed …………………………………………………………………………	76
Figure 2-63 Remove the pickup solenoid (1 of 5) ………………………………………………………………………………..	77
Figure 2-64 Remove the pickup solenoid (2 of 5) ………………………………………………………………………………..	78
Figure 2-65 Remove the pickup solenoid (3 of 5) ………………………………………………………………………………..	78
Figure 2-66 Remove the pickup solenoid (4 of 5) ………………………………………………………………………………..	79
Figure 2-67 Remove the pickup solenoid (5 of 5) ………………………………………………………………………………..	79
Figure 2-68 Remove the engine controller PCA (1 of ……………………………………………………………………….	80
Figure 2-69 Remove the engine controller PCA (2 of ……………………………………………………………………….	81
Figure 2-70 Remove the engine controller PCA (3 of ……………………………………………………………………….	81
Figure 2-71 Remove the engine controller PCA (4 of ……………………………………………………………………….	82
Figure 2-72 Remove the engine controller PCA (5 of ……………………………………………………………………….	82
Figure 2-73 Remove the engine controller PCA (6 of ……………………………………………………………………….	83
Figure 2-74 Remove the engine controller PCA (7 of ……………………………………………………………………….	83
Figure 2-75 Remove the engine controller PCA (8 of ……………………………………………………………………….	84
Figure 2-76 Reinstall the engine controller PCA (1 of 4) ……………………………………………………………………….	84
Figure 2-77 Reinstall the engine controller PCA (2 of 4) ……………………………………………………………………….	85
Figure 2-78 Reinstall the engine controller PCA (3 of 4) ……………………………………………………………………….	85
Figure 2-79 Reinstall the engine controller PCA (4 of 4) ……………………………………………………………………….	86
Figure 3-1 Sample engine test page ………………………………………………………………………………………………….	93
Figure 3-2	Plug/jack locations …………………………………………………………………………………………………………..	95
Figure 3-3 Engine controller PCA connectors ……………………………………………………………………………………..	96
Figure 3-4	External view …………………………………………………………………………………………………………………..	97
Figure 3-5 Cross section view …………………………………………………………………………………………………………..	98
Figure 3-6 General timing diagram …………………………………………………………………………………………………….	99
Figure 3-7 Circuit diagram; HP LaserJet Professional P1100 Printer series ………………………………………….	100
Figure 3-8 Circuit diagram; HP LaserJet Professional P1100w Printer series ………………………………………..	101
Figure 4-1	Base product ………………………………………………………………………………………………………………..	139
Figure 4-2	Base model …………………………………………………………………………………………………………………..	140
Figure 4-3	Wireless model ……………………………………………………………………………………………………………..	142
Figure 4-4 Internal assemblies (1 of 3) ……………………………………………………………………………………………..	144
Figure 4-5 Internal assemblies (2 of 3) ……………………………………………………………………………………………..	146
Figure 4-6 Internal assemblies (3 of 3) ……………………………………………………………………………………………..	148
Figure 4-7	PCAs ……………………………………………………………………………………………………………………………	150

1 Theory of operation

●Basic operation

●Formatter-control system

●Engine-control system

●Image-formation system

●Pickup, feed, and delivery system

●Input tray, main-input tray, or priority input slot

Basic operation

Major product systems

The product contains the following major systems:

●Engine-control system

●Laser/scanner system

●Image-formation system

●Pickup-and-feed system

Product block diagram

Figure 1-1 Product block diagram

LASER/SCANNER SYSTEM

ENGINE CONTROL	IMAGE-FORMATION SYSTEM
SYSTEM

PICKUP-AND-FEED SYSTEM

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Sequence of operation

Normal sequence of operation

Table 1-1 Sequence of operation

Name	Timing	Purpose

WAIT	From the time the power switch is turned on, the door	Brings the product to the ready state. The product
	is closed or the product exits Sleep mode until the	performs the following during the operations:
	product gets ready for a print operation.	● Detects the print cartridge

		● Heats the fuser film in the fuser
		● Rotates, and then stops, the main motor

STBY (standby) From the end of the WAIT or LSTR period until either a print command is sent or the power switch is turned off.

Maintains the product in printable condition. The product performs the following during the operation:

●Enters Auto-Off mode if the Auto-Off command is received

INTR (initial	From the time a print command is received until the
rotation)	paper is picked up.

The product performs the following during the operations:

●Drives the main motor

●Activates the high-voltage power supply

●Activates the laser/scanner

●Warms the fuser heater

PRINT	From the end of the INTR period until the last sheet
	completes the fuser operation.

Forms the image on the photosensitive drum based on the VIDEO signals from the formatter. Transfers and fuses the toner image to the paper.

LSTR (last	From the end of the PRINT period until the main motor
rotation)	stops rotating.

Moves the last printed sheet out of the product. The product performs the following during the operations:

●Stops the main motor

●Deactivates the high-voltage power supply

●Deactivates the laser/scanner

●Deactivates the fuser heater

The product enters the INTR period as the LSTR period is completed, if the formatter sends another print command.

Formatter-control system

The formatter is responsible for the following procedures:

●Controlling sleep mode

●Receiving and processing print data from the various product interfaces

●Monitoring control-panel functions and relaying product-status information (through the control panel and the network or bidirectional interface)

●Developing and coordinating data placement and timing with the DC controller PCA

●Storing font information

●Communicating with the host computer through the network or the bidirectional interface

Sleep mode

NOTE: This product uses an Auto-Off feature for sleep mode.

NOTE: Although the product lights are off in Auto-Off mode, the product functions normally when it receives a print job.

Input/output

The product receives print data primarily from the following:

●Hi-Speed USB 2.0 port

●802.11b/g wireless networking (wireless models only)

CPU

The formatter incorporates a 400 MHz Helium processor.

Memory

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Firmware

●HP LaserJet Professional P1100 Printer series

◦The product has 2 MB of Synchronous DRAM, which is used for run-time firmware imaging and specific print job information for the print job.

●HP LaserJet Professional P1100w Printer series

◦The product has 8 MB of Synchronous DRAM, which is used for run-time firmware imaging and specific print job information for the print job.

Memory use

●HP LaserJet Professional P1100 Printer series

◦The product has a 2 KB EEPROM and 64 MB of NAND Flash Memory, which is used for product configuration information and printer driver firmware.

●HP LaserJet Professional P1100w Printer series

◦The product has a 8 KB EEPROM and 64 MB of NAND Flash Memory, which is used for product configuration information and printer driver firmware.

PJL overview

●Context-sensitive switching. The product can automatically recognize the personality (PS or PCL) of each job and configure itself to serve that personality.

LEDM overview

NOTE: HP LaserJet Professional P1100w Printer series

ACL overview

The advanced control language (ACL) is a language that supports product control and firmware downloads in products that support both PJL/PCL and host-based printing. Each sequence of ACL

ENWW	Formatter-control system 5

Control panel

The formatter sends and receives product status and command data to and from the control-panel PCA.

Wireless PCA

NOTE: Wireless models only.

The wireless PCA controls the wireless function of the product

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Engine-control system

The engine control system contains the following major components:

●Engine-control unit (ECU)

◦DC controller

◦Low-voltage power supply

●High-voltage power supply

●Fuser control

Figure 1-2 Engine-control system

ENGINE CONTROL SYSTEM

DC controller

Low-voltage power supply

LASER/SCANNER SYSTEM

Formatter

IMAGE-FORMATION SYSTEM

High-voltage power supply

MEDIA-FEED SYSTEM

Fuser control

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Motors, fans, clutches, solenoids, switches, and sensors

Figure 1-3 Motors

Table 1-2 Motors

Description	Components driven

Main motor (M1)	●	Pickup roller
	●	Feed roller
	●	Photosensitive drum
	●	Developing roller
	●	Pressure roller
	●	Delivery roller

Scanner motor (M2)	●	Scanner mirror

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Figure 1-4 Solenoids and clutches

SL1

Table 1-3 Solenoids and clutches

Item	Description

SL1	Pickup solenoid

Figure 1-5 Switches

Table 1-4 Switches

Item	Description

SW501	Cartridge-door switch

SW502	Power switch; not shown

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Figure 1-6	Sensors
	PS702
	PS701
	Single-sheet-feed slot
	(HP LJP P1100w printer Series)
	PS751
Table 1-5 Sensors
Item	Description
PS701	Fuser delivery sensor
PS702	Media width sensor
PS751	Top-of-Page (TOP) sensor
PS901	Main-motor rotation-number sensor; not shown

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DC controller operations

The DC controller controls the operational sequences of the product systems.

Figure 1-7 DC controller block diagram

		Engine controller
AC input
	Low-voltage	Motor
	power supply
Fuser unit
		Solenoid
Transfer roller		Photointerrupter
		DC controller
Cartridge	High-voltage
power supply
	Switch

Laser scanner

Formatter

Operation panel

Table 1-6 DC controller controlled components

Component	Designator	Description

Motor	M1	Main motor

	M2	Scanner motor

Solenoid	SL1	Pickup solenoid

Photointerrupter	PS701	Fuser delivery sensor

	PS702	Media width sensor

	PS751	Top-of-Page (TOP) sensor

	PS901	Main-motor rotation-number sensor

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Table 1-6 DC controller controlled components (continued)

Component	Designator	Description

Switch	SW501	Cartridge-door switch

	SW502	Power switch

Fuser-control circuit

The fuser-control circuit monitors and controls the temperature in the fuser. The product uses ondemand fusing. The fuser-control circuit consists of the following major components:

●Fuser heater (H1); heats the fusing film

●Thermistor (TH1); detects the fuser temperature (contact type)

●Thermal fuse (FU1); prevents abnormal temperature rise in the fuser (contact type)

Figure 1-8 Fuser control circuit

Fuser film

TH1

FU1

Pressure roller

FUSER TEMPERATURE signal

FUSER HEATER CONTROL signal

Fuser heater control	Fuser heater safety
circuit	circuit
Fuser control	DC controller

	Engine controller

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Fuser failure detection

●Start up failure

◦If the main thermistor does not detect a specified temperature during the start up process of the heater in the wait period.

◦If the main thermistor does not detect a specified temperature during the heater temperature control in the initial rotation period.

●Abnormal low temperature

◦If the main thermistor detects an abnormal low temperature of the fuser unit during the printing operation.

●Abnormal high temperature

◦If the main thermistor detects an abnormal high temperature of the fuser unit.

●Frequency detection circuit failure

◦If a specified frequency of the FREQUENCY signal is not detected within a specified period after the product is turned on.

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Fuser temperature control

The fuser temperature control maintains the temperature of the fuser heater at its targeted temperature.

Figure 1-9 Fuser-heater control circuit

AC input

			Fixing control

		Frequency detection	FREQSNS

		circuit

		(220-240V model only)

RL101	Relay control	Fuser heater	RLYD
circuit	safety circuit

Fuser heater			FSRD
control circuit
			FSRTH
FU1	TH1
	H1

Fuser film unit

Engine controller

DC controller

Pressure roller

Fuser unit

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Fuser protective function

The protective function detects an abnormal temperature rise of the fuser unit and interrupts power supply to the fuser heater.

The following three protective components prevent an abnormal temperature rise of the fuser heater:

●DC controller

◦The DC controller interrupts power supply to the fuser heater when it detects an abnormal temperature of the fuser heater.

●Fuser heater safety circuit

◦The fuser heater safety circuit interrupts power supply to the fuser heater when the detected temperature of the main thermistor is abnormal.

●Thermal fuse

◦The contact of the thermal fuse is broken to interrupt power supply to the fuser heater when the thermal fuse detects an abnormal temperature of the fuser heater.

Pressure roller cleaning

The pressure roller cleaning process is initiated by the formatter. The process removes toner that has accumulated on the pressure roller by transferring it to a sheet of paper.

●The product feeds a sheet of paper after receiving the cleaning command from the formatter.

●Main motor rotation is stopped when the trailing edge of the paper passes through the transfer roller.

●The main motor rotation is repeatedly started and then stopped. The fuser heater is turned on and then off at the same interval as main motor rotation.

●Toner adhered to the pressure roller is fused to the paper.

●The paper is ejected from the product.

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Low-voltage power supply

Figure 1-10 Low-voltage power supply (LVPS)

AC input

	Engine controller
	Low-voltage power supply		DC controller
		Fuser unit
	Fuse (FU101)
Fuse (FU201)
	Cartridge-door switch	High-voltage
	(SW501)	power supply
	+24U
Rectifying
circuit
	Frequency	FREQSNS
	detection circuit

	(220-240V model only)
+24V			BSTSIG

generation			+24V
circuit
	+24V ON/OFF		24VON
		+24P
	circuit

	+5V		+5V
Protection	generation
	+5R
circuit	circuit

	+3.3V		+3.3V
	generation

	circuit
			+3.3VON
	+3.3V ON/OFF	+3.3UON
		circuit	+3.3U
		+3.3R
	Formatter	Power switch
			(SW502)

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Overcurrent/overvoltage protection

In addition, two fuses in the low-voltage power supply protect against overcurrent. If overcurrent flows into the ac line, the fuses melt and cut off the power distribution.

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High-voltage power supply

The high-voltage power supply (HVPS) applies biases to the following components:

●Primary charging roller

●Developing roller

●Transfer roller

Figure 1-11 High-voltage power supply

Engine controller

DC controller

High-voltage power supply

Primary charging bias circuit

To primary charging roller

Developing To developing roller bias circuit

Cartridge

Transfer bias	Photosensitive drum
circuit	Transfer roller

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Laser/scanner system

The laser/scanner system receives VIDEO signals from the ECU and formatter and converts the signals into latent images on the photosensitive drum.

The main components of the laser/scanner are the laser unit and the scanner motor unit. The DC controller sends signals to the laser/scanner to control the functions of these components.

Figure 1-12 Laser/scanner system

BD sensor	Photosensitive drum

Laser unit

Scanning mirror

Scanner motor unit

BDI signal	VIDEO signal	LASER CONTROL signal	SCANNER MOT OR CONTROL signal
			DC controller
			Engine controller
			Formatter

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Laser failure detection

The DC controller determines an optical unit failure and notifies the formatter, if the laser/scanner encounters the following conditions:

●The scanner motor does not reach a specified rotation within a specified period of the scanner motor start up.

●The rotation of the scanner motor is out of specified range for a specified period during the scanner motor drive.

●The BD interval is out of a specified value during a print operation.

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Image-formation system

Electrophotographic process

The electrophotographic process forms an image on the paper. Following are the major components used in the process:

●Print cartridge

●Transfer roller

●Fuser

●Laser/scanner

●High-voltage power supply

The DC controller uses the laser/scanner and HVPS to form the toner image on the photosensitive drum. The image is transferred to the paper and then fused onto the paper.

Figure 1-13 Electrophotographic process block diagram (1 of 2)

Transfer roller

Cartridge

Laser scanner

High-voltage power supply

DC controller

Engine controller

The DC controller rotates the main motor to drive the following components:

●Photosensitive drum

●Developing drum

●Primary charging roller (follows the rotation of the photosensitive drum)

●Transfer roller (follows the rotation of the photosensitive drum)

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Figure 1-14 Electrophotographic process block diagram (2 of 2)

Primary charging roller
Developing roller	Main motor

Cartridge

Transfer roller

Photosensitive drum

DC controller

Engine controller

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Image formation process

Each of the following process function independently and must be coordinated with the other product processes. Image formation consists of the following processes:

●Latent-image formation block

◦Step 1: primary charging

◦Step 2: laser-beam exposure

●Developing block

◦Step 3: developing

●Transfer block

◦Step 4: transfer

◦Step 5: separation

●Fusing block

◦Step 6: fusing

●Drum cleaning block

◦Step 7: drum cleaning

Figure 1-15 Image formation process

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Latent-image formation stage

During the latent-image formation stage, the laser/scanner forms an invisible image on the photosensitive drum in the print cartridge.

Primary charging

Step 1: dc and ac biases are applied to the primary charging roller, which transfers a uniform negative potential to the photosensitive drum.

Figure 1-16 Primary charging

Primary charging roller

DC bias

Photosensitive drum

Laser beam exposure

Figure 1-17 Laser beam exposure

Laser beam

Unexposed area

Exposed area

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Developing stage

Print cartridge

Step 3: In the print cartridge, the developing cylinder transfers toner onto the electrostatic latent image on the photosensitive drum.

Figure 1-18 Print cartridge

Blade
	Developing cylinder
Exposed area	Unexposed area	AC bias

Unexposed area	Exposed area
		DC bias

Photosensitive drum

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Transfer stage

Figure 1-19 Transfer

Photosensitive

drum

Media

Transfer roller

DC bias

Step 5: The elasticity of the paper causes its separation from the photosensitive drum. A static charge eliminator aids separation by weakening any electrostatic adhesion.

Figure 1-20 Separation

Photosensitive

drum

Media

Static charge eliminator

Transfer roller

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Fusing stage

Step 6: The DC negative bias applied to the fusing film strengthens the holding force of the toner on the paper and prevents the toner from scattering.

The product uses an on-demand fuser method. The toner image is permanently affixed to the paper by heat and pressure.

Figure 1-21 Fusing

Fuser heater

Fuser film

Toner

Media

Pressure roller

Cleaning stage

Step 7: The cleaning blade scrapes the residual toner off of the photosensitive drum and deposits it into the waste toner case.

Figure 1-22 Drum cleaning

Cleaning blade

Photosensitive

Waste toner container

drum

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Pickup, feed, and delivery system

The media feed system picks up, feeds, and delivers the page.

Figure 1-23 Pickup, feed, and delivery system block diagram

Delivery roller

	Pressure roller
	Fuser film
	Transfer roller
	Photosensitive drum	Single-sheet-feed slot
	(HP LJP P1100w printer Series)

Feed roller

Pickup roller

Separation pad

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Photo sensors and switches

NOTE: The illustration in this section also shows the product motor and solenoid. The power switch is not shown.

Figure 1-24 Photo sensors, motor, and solenoid

PS702

PS701

PS751

Single-sheet-feed slot

(HP LJP P1100w printer Series)

Table 1-7 Photo sensors, motor, and solenoid

Item	Description

M1	Main motor

SL1	Pickup solenoid

PS701	Fuser delivery sensor

PS702	Media-width sensor

PS751	TOP sensor

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Input tray, main-input tray, or priority input slot

NOTE: The HP LaserJet Professional P1100 Printer series has a single input tray. The HP LaserJet Professional P1100w Printer series has a main-input tray and a priority input slot.

Jam detection

The product uses the following sensors to detect the presence of paper and to check for jams. The paper must pass each sensor within a specified time.

NOTE: To find the following components, see Photo sensors and switches on page 29.

●PS701; fuser delivery sensor

●PS702; TOP sensor

NOTE: The product automatically ejects paper if the TOP sensor detects residual paper within the product when the power is turned on or the door is closed.

The product detects the following jams:

●Pickup stationary jam

●Delivery delay jam

●Delivery stationary jam

●Fuser wrapping jam

●Door open jam

●Residual media jam

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2 Removal and replacement

●Introduction

●Removal and replacement strategy

●Electrostatic discharge

●Required tools

●Before performing service

●After performing service

●Post-service test

●Parts removal order

●Pickup roller

●Separation pad

●Transfer roller

●Covers

●Main assemblies

Introduction

This chapter describes the removal and replacement of field-replaceable units (FRUs) only.

Replacing FRUs is generally the reverse of removal. Occasionally, notes and tips are included to provide directions for difficult or critical replacement procedures.

HP does not support repairing individual subassemblies or troubleshooting to the component level.

Note the length, diameter, color, type, and location of each screw. Be sure to return each screw to its original location during reassembly.

Removal and replacement strategy

Never operate or service the product with the protective cover removed from the laser/scanner assembly. The reflected beam, although invisible, can damage your eyes.

The sheet-metal parts can have sharp edges. Be careful when handling sheet-metal parts.

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