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HP LaserJet M1120 MFP Series

Service Manual

HP LaserJet M1120 MFP 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.

Edition 1, 1/2008

Part number: CB537-90945

Trademark Credits

Adobe®, Acrobat®, and PostScript® are trademarks of Adobe Systems Incorporated.

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

UNIX® is a registered trademark of The Open Group.

Table of contents

1	Product information
	Quick access to product information ……………………………………………………………………………………….	2
	Product comparison ……………………………………………………………………………………………………………..	3
	Product features …………………………………………………………………………………………………………………..	4
	Product walkaround ………………………………………………………………………………………………………………	5
	Front view …………………………………………………………………………………………………………….	5
	Back view ……………………………………………………………………………………………………………..	5
	Interface ports ……………………………………………………………………………………………………….	6
	Serial number and model number location ………………………………………………………………..	6
	Software description ……………………………………………………………………………………………………………..	7
	Supported operating systems ………………………………………………………………………………….	7
	Supported printer drivers ………………………………………………………………………………………..	7
	Software included with the product …………………………………………………………………………..	7
	Easy installation for Windows …………………………………………………………………..	7
	Advanced installation ………………………………………………………………………………	8
	Macintosh software …………………………………………………………………………………	8
	Software for Windows …………………………………………………………………………………………………………..	9
	Embedded Web server (network models only) …………………………………………………………..	9
	Status Alerts software …………………………………………………………………………………………….	9
	Other Windows components and utilities …………………………………………………………………..	9
	Software for Macintosh ………………………………………………………………………………………………………..	10
	Embedded Web server (network models only) …………………………………………………………	10
	HP Director …………………………………………………………………………………………………………	10
	Uninstall software ……………………………………………………………………………………………………………….	11
	Windows …………………………………………………………………………………………………………….	11
	Macintosh …………………………………………………………………………………………………………..	11
	Media specifications ……………………………………………………………………………………………………………	12
	Supported paper and print media sizes …………………………………………………………………..	12
	Supported paper types and tray capacity ………………………………………………………………..	13
2	Installation
	Site preparations ………………………………………………………………………………………………………………..	16
	Operating environment …………………………………………………………………………………………	16
	Minimum system requirements ………………………………………………………………………………	17
	What was in the box ……………………………………………………………………………………………………………	18
	Install input devices …………………………………………………………………………………………………………….	19
	Priority input tray ………………………………………………………………………………………………….	19
	Tray 1 …………………………………………………………………………………………………………………	20
	Install supplies ……………………………………………………………………………………………………………………	21

Install the print cartridge ……………………………………………………………………………………….	21
3 Maintenance
Manage supplies ………………………………………………………………………………………………………………..	24
Life expectancies of supplies …………………………………………………………………………………	24
Check and order supplies ……………………………………………………………………………………..	24
Store supplies ……………………………………………………………………………………………………..	24
Replace supplies …………………………………………………………………………………………………	25
Print cartridge ……………………………………………………………………………………….	25
HP policy on non-HP supplies ……………………………………………………………………………….	26
HP fraud hotline …………………………………………………………………………………………………..	27
Clean the product ……………………………………………………………………………………………………………….	28
Clean the exterior ………………………………………………………………………………………………..	28
Clean the flatbed scanner glass …………………………………………………………………………….	28
Clean the lid backing ……………………………………………………………………………………………	28
Clean the paper path ……………………………………………………………………………………………	29
Management tools ………………………………………………………………………………………………………………	30
Information pages ………………………………………………………………………………………………..	30
Embedded Web server …………………………………………………………………………………………	30
Features ………………………………………………………………………………………………	31
4 Operational theory
Basic operation …………………………………………………………………………………………………………………..	34
Sequence of operation for the base unit ………………………………………………………………….	34
Scanner functions and operation …………………………………………………………………………………………..	36
Scanner functions ……………………………………………………………………………………………….	36
Scanner operation ……………………………………………………………………………………………….	37
Internal components (base unit) ……………………………………………………………………………………………	38
Engine control system …………………………………………………………………………………………………………	39
Laser/scanner system …………………………………………………………………………………………………………	41
Pickup/feed/delivery system …………………………………………………………………………………………………	42
Image-formation system ……………………………………………………………………………………………………..	43
5 Removal and replacement
Removal and replacement strategy ……………………………………………………………………………………….	48
Introduction …………………………………………………………………………………………………………	48
Removal and replacement warnings, cautions, notes, and tips ……………………	48
Electrostatic discharge …………………………………………………………………………..	49
Required tools ………………………………………………………………………………………	49
Before performing service …………………………………………………………………………………….	49
After performing service ………………………………………………………………………………………..	50
Post-service tests ………………………………………………………………………………………………..	51
Test 1 (print-quality test) ………………………………………………………………………..	51
Test 2 (copy-quality test) ………………………………………………………………………..	51
Parts removal order ……………………………………………………………………………………………..	52
Scanner assembly ………………………………………………………………………………………………………………	53
Link assemblies and scanner support-frame spring ………………………………………………….	53
Scanner lid ………………………………………………………………………………………………………….	56
Control-panel overlay ……………………………………………………………………………………………	57

Control-panel assembly ………………………………………………………………………………………..	58
Scanner assembly ……………………………………………………………………………………………….	60
Product base ……………………………………………………………………………………………………………………..	65
Print cartridge ……………………………………………………………………………………………………..	65
Separation pad ……………………………………………………………………………………………………	66
Pickup roller ………………………………………………………………………………………………………..	67
Scanner cushions ………………………………………………………………………………………………..	70
Media input tray …………………………………………………………………………………………………..	71
Transfer roller ……………………………………………………………………………………………………..	73
Side covers …………………………………………………………………………………………………………	74
Print-cartridge door ………………………………………………………………………………………………	76
Rear cover and fuser cover …………………………………………………………………………………..	77
Front cover ………………………………………………………………………………………………………….	79
Formatter ……………………………………………………………………………………………………………	81
Power supply ………………………………………………………………………………………………………	82
Scanner support frame …………………………………………………………………………………………	86
Laser/scanner assembly ……………………………………………………………………………………….	89
Main motor ………………………………………………………………………………………………………….	93
Fuser ………………………………………………………………………………………………………………….	96
Paper-pickup assembly ………………………………………………………………………………………	100
Drive-gear assembly and drive belt ………………………………………………………………………	103
6 Problem solve
Problem-solving checklist …………………………………………………………………………………………………..	106
Control-panel messages ……………………………………………………………………………………………………	108
Alert and warning messages ………………………………………………………………………………	108
Alert and warning message tables …………………………………………………………	108
Critical error messages ……………………………………………………………………………………….	109
Critical error message-tables ………………………………………………………………..	109
Clear jams ……………………………………………………………………………………………………………………….	111
Causes of jams ………………………………………………………………………………………………….	111
Where to look for jams ………………………………………………………………………………………..	112
Clear jams from the input-tray areas …………………………………………………………………….	112
Clear jams from the output bin ……………………………………………………………………………..	115
Clear jams from the print-cartridge area ………………………………………………………………..	116
Avoid repeated jams ………………………………………………………………………………………….	117
Print problems ………………………………………………………………………………………………………………….	118
Print-quality problems …………………………………………………………………………………………	118
Improve print quality …………………………………………………………………………….	118
Print-quality settings ……………………………………………………………..	118
Identify and correct print defects ……………………………………………………………	119
Print-quality checklist …………………………………………………………….	119
General print-quality issues ……………………………………………………	120
Scan problems …………………………………………………………………………………………………………………	124
Solve scanned-image problems …………………………………………………………………………..	124
Scan-quality problems ………………………………………………………………………………………..	126
Prevent problems ………………………………………………………………………………..	126
Solve scan-quality problems …………………………………………………………………	126
Copy problems …………………………………………………………………………………………………………………	127
Prevent problems ……………………………………………………………………………………………….	127

Image problems …………………………………………………………………………………………………	127
Media-handling problems ……………………………………………………………………………………	128
Performance problems ……………………………………………………………………………………….	130
Functional checks ……………………………………………………………………………………………………………..	131
Engine test page ………………………………………………………………………………………………..	131
Drum rotation test ………………………………………………………………………………………………	131
Half self-test functional check ………………………………………………………………………………	132
Perform a half self-test check ………………………………………………………………..	132
Perform other checks ………………………………………………………………………….	132
Heating element check ……………………………………………………………………………………….	133
High-voltage contacts check ………………………………………………………………………………..	133
Check the print-cartridge contacts ……………………………………………………….	133
Check the high-voltage connector assembly …………………………………………..	134
Service-mode functions ……………………………………………………………………………………………………..	135
NVRAM initialization …………………………………………………………………………………………..	135
Super NVRAM initialization ………………………………………………………………………………….	135
Secondary service menu …………………………………………………………………………………….	135
Problem-solving tools ………………………………………………………………………………………………………..	137
Product information pages and reports ………………………………………………………………….	137
Configuration page ………………………………………………………………………………	137
Demo page …………………………………………………………………………………………	137
Menu map …………………………………………………………………………………………………………	137
Service menu …………………………………………………………………………………………………….	138
Restore the factory-set defaults …………………………………………………………….	138
Clean the paper path ……………………………………………………………………………	138
Archive print ……………………………………………………………………………………….	138
Problem-solving diagrams ………………………………………………………………………………………………….	140
Repetitive image defects …………………………………………………………………………………….	140
Interface ports ……………………………………………………………………………………………………	141
Formatter connectors ………………………………………………………………………………………….	142
ECU connectors …………………………………………………………………………………………………	143
Solenoid and motor …………………………………………………………………………………………….	144
Rollers ………………………………………………………………………………………………………………	145
Sensors …………………………………………………………………………………………………………….	146
Major components ……………………………………………………………………………………………..	147
PCAs (base unit) ………………………………………………………………………………………………..	148
Circuit diagram …………………………………………………………………………………………………..	149
Firmware updates ……………………………………………………………………………………………………………..	150
7 Parts
Ordering information ………………………………………………………………………………………………………….	152
Supplies and hinge tool ……………………………………………………………………………………………………..	152
Cable and interface accessories …………………………………………………………………………………………	152
Whole-unit replacement …………………………………………………………………………………………………….	153
Control-panel overlays ………………………………………………………………………………………………………	157
Supplementry documentation and support ……………………………………………………………………………	160
Parts lists and diagrams …………………………………………………………………………………………………….	162
Types of screws …………………………………………………………………………………………………	163
Scanner assemblies ………………………………………………………………………………………………………….	164
Assemblies ………………………………………………………………………………………………………………………	166

External covers and panels ………………………………………………………………………………………………..	168
Internal components (1 of 3) ………………………………………………………………………………………………	170
Internal components (2 of 3) ………………………………………………………………………………………………	172
Internal components (3 of 3) ………………………………………………………………………………………………	174
Alphabetical parts list ………………………………………………………………………………………………………..	176
Numerical parts list ……………………………………………………………………………………………………………	178
Appendix A Service and support
Hewlett-Packard limited warranty statement …………………………………………………………………………	181
Customer self repair warranty service ………………………………………………………………………………….	182
Print cartridge limited warranty statement …………………………………………………………………………….	183
Customer support ……………………………………………………………………………………………………………..	184
HP maintenance agreements ……………………………………………………………………………………………..	184
Repacking the device …………………………………………………………………………………………	184
Extended warranty ……………………………………………………………………………………………..	184
Appendix B Specifications
Physical specifications ………………………………………………………………………………………………………	186
Electrical specifications ……………………………………………………………………………………………………..	186
Power consumption …………………………………………………………………………………………………………..	186
Environmental specifications ………………………………………………………………………………………………	187
Acoustic emissions ……………………………………………………………………………………………………………	187
Appendix C Regulatory information
FCC compliance ……………………………………………………………………………………………………………….	190
Environmental product stewardship program ………………………………………………………………………..	190
Protecting the environment ………………………………………………………………………………….	190
Ozone production ………………………………………………………………………………………………	190
Power consumption ……………………………………………………………………………………………	190
Toner consumption …………………………………………………………………………………………….	190
Paper use …………………………………………………………………………………………………………	190
Plastics …………………………………………………………………………………………………………….	191
HP LaserJet print supplies …………………………………………………………………………………..	191
Return and recycling instructions ………………………………………………………………………….	191
United States and Puerto Rico ………………………………………………………………	191
Multiple returns (two to eight cartridges) ………………………………….	191
Single returns ………………………………………………………………………	191
Shipping ………………………………………………………………………………	191
Non-US returns …………………………………………………………………………………..	192
Paper ……………………………………………………………………………………………………………….	192
Material restrictions …………………………………………………………………………………………….	192
Disposal of waste equipment by users in private households in the European Union ….	192
Material Safety Data Sheet (MSDS) ……………………………………………………………………..	192
For more information ………………………………………………………………………………………….	192
Declaration of conformity ……………………………………………………………………………………………………	194
Safety statements ……………………………………………………………………………………………………………..	195
Laser safety ………………………………………………………………………………………………………	195
Canadian DOC regulations ………………………………………………………………………………….	195
EMI statement (Korea) ………………………………………………………………………………………..	195

Laser statement for Finland …………………………………………………………………………………	196
Substances table (China) ……………………………………………………………………………………	196
Index ……………………………………………………………………………………………………………………………………………..	199

List of tables

Table 1-1	Product guides …………………………………………………………………………………………………………………..	2
Table 1-2 Supported paper and print media sizes ……………………………………………………………………………….	12
Table 1-3 Supported envelopes and postcards …………………………………………………………………………………..	12
Table 1-4 Supported paper types and tray capacity …………………………………………………………………………….	13
Table 4-1 Sequence of operation ………………………………………………………………………………………………………	34
Table 4-2	Power-on sequence ………………………………………………………………………………………………………….	35
Table 6-1 Repetitive image defects ………………………………………………………………………………………………….	140
Table 6-2	Formatter connectors ………………………………………………………………………………………………………	142
Table 6-3	ECU connectors ……………………………………………………………………………………………………………..	143
Table 6-4 Solenoid and motor …………………………………………………………………………………………………………	144
Table 6-5	Rollers …………………………………………………………………………………………………………………………..	145
Table 6-6	Sensors …………………………………………………………………………………………………………………………	146
Table 6-7	Major components …………………………………………………………………………………………………………..	147
Table 6-8 PCAs (base unit) …………………………………………………………………………………………………………….	148
Table 7-1 Whole-unit replacement, product bundle CC537A ……………………………………………………………….	153
Table 7-2 Whole-unit replacement, product bundle CC459A ……………………………………………………………….	155
Table 7-3 Control-panel overlays, HP LaserJet M1120 ………………………………………………………………………	157
Table 7-4 Control-panel overlays, HP LaserJet M1120n …………………………………………………………………….	158
Table 7-5 Documentation (print on demand) …………………………………………………………………………………….	160
Table 7-6	Scanner assemblies ………………………………………………………………………………………………………..	165
Table 7-7	Assemblies …………………………………………………………………………………………………………………….	167
Table 7-8 External covers and panels ………………………………………………………………………………………………	169
Table 7-9 Internal components (1 of 3) …………………………………………………………………………………………….	171
Table 7-10 Internal components (2 of 3) …………………………………………………………………………………………..	173
Table 7-11 Internal components (3 of 3) …………………………………………………………………………………………..	175
Table 7-12 Alphabetical parts list …………………………………………………………………………………………………….	176
Table 7-13 Numerical parts list ………………………………………………………………………………………………………..	178
Table B-1	Physical specifications …………………………………………………………………………………………………….	186
Table B-2	Electrical specifications ……………………………………………………………………………………………………	186
Table B-3 Power consumption (average, in watts) ……………………………………………………………………………	186
Table B-4	Environmental specifications …………………………………………………………………………………………..	187
Table B-5	Acoustic emissions ………………………………………………………………………………………………………..	187
Table C-1 ……………………………………………………………………………………………………………..	196

List of figures

Figure 4-1 System block diagram ………………………………………………………………………………………………………	34
Figure 4-2 Optical system (1 of 2) ……………………………………………………………………………………………………..	36
Figure 4-3 Optical system (2 of 2) ……………………………………………………………………………………………………..	37
Figure 4-4 Cross-section of printer …………………………………………………………………………………………………….	38
Figure 4-5 Engine control system ………………………………………………………………………………………………………	39
Figure 4-6 Engine-control-system circuit diagram ………………………………………………………………………………..	40
Figure 4-7	Laser/scanner system ………………………………………………………………………………………………………	41
Figure 4-8	Pickup/feed/delivery system ……………………………………………………………………………………………..	42
Figure 4-9	Image-formation system …………………………………………………………………………………………………..	43
Figure 4-10	Primary charging ……………………………………………………………………………………………………………	43
Figure 4-11	Developing ……………………………………………………………………………………………………………………	44
Figure 4-12	Transfer ………………………………………………………………………………………………………………………..	45
Figure 4-13	Separation …………………………………………………………………………………………………………………….	45
Figure 4-14	Fusing ………………………………………………………………………………………………………………………….	46
Figure 4-15	Drum cleaning ……………………………………………………………………………………………………………….	46
Figure 5-1 Phillips and pozidrive screwdriver comparison …………………………………………………………………….	49
Figure 5-2 Parts removal order …………………………………………………………………………………………………………	52
Figure 5-3 Remove the link assemblies and scanner support-frame spring (1 of 4) ………………………………….	53
Figure 5-4 Remove the link assemblies and scanner support-frame spring (2 of 4) ………………………………….	54
Figure 5-5 Remove the link assemblies and scanner support-frame spring (3 of 4) ………………………………….	54
Figure 5-6 Remove the link assemblies and scanner support-frame spring (4 of 4) ………………………………….	55
Figure 5-7 Remove the scanner lid (1 of 2) …………………………………………………………………………………………	56
Figure 5-8 Remove the scanner lid (2 of 2) …………………………………………………………………………………………	56
Figure 5-9 Remove the control-panel overlay ……………………………………………………………………………………..	57
Figure 5-10 Remove the control-panel assembly (1 of 3) ……………………………………………………………………..	58
Figure 5-11 Remove the control-panel assembly (2 of 3) ……………………………………………………………………..	58
Figure 5-12 Remove the control-panel assembly (3 of 3) ……………………………………………………………………..	59
Figure 5-13 Remove the scanner assembly (1 of 10) …………………………………………………………………………..	60
Figure 5-14 Remove the scanner assembly (2 of 10) …………………………………………………………………………..	60
Figure 5-15 Remove the scanner assembly (3 of 10) …………………………………………………………………………..	61
Figure 5-16 Remove the scanner assembly (4 of 10) …………………………………………………………………………..	61
Figure 5-17 Remove the scanner assembly (5 of 10) …………………………………………………………………………..	62
Figure 5-18 Remove the scanner assembly (6 of 10) …………………………………………………………………………..	62
Figure 5-19 Remove the scanner assembly (7 of 10) …………………………………………………………………………..	63
Figure 5-20 Remove the scanner assembly (8 of 10) …………………………………………………………………………..	63
Figure 5-21 Remove the scanner assembly (9 of 10) …………………………………………………………………………..	64
Figure 5-22 Remove the scanner assembly (10 of 10) …………………………………………………………………………	64
Figure 5-23 Remove the print cartridge (1 of 2) …………………………………………………………………………………..	65
Figure 5-24 Remove the print cartridge (2 of 2) …………………………………………………………………………………..	65

Figure 5-25 Remove the separation pad (1 of 2) …………………………………………………………………………………	66
Figure 5-26 Remove the separation pad (2 of 2) …………………………………………………………………………………	66
Figure 5-27 Remove the pickup roller (1 of 5) ……………………………………………………………………………………..	67
Figure 5-28 Remove the pickup roller (2 of 5) ……………………………………………………………………………………..	67
Figure 5-29 Remove the pickup roller (3 of 5) ……………………………………………………………………………………..	68
Figure 5-30 Remove the pickup roller (4 of 5) ……………………………………………………………………………………..	68
Figure 5-31 Remove the pickup roller (5 of 5) ……………………………………………………………………………………..	69
Figure 5-32 Installing the scanner cushions ………………………………………………………………………………………..	70
Figure 5-33 Remove the media input tray (1 of 3) ……………………………………………………………………………….	71
Figure 5-34 Remove the media input tray (2 of 3) ……………………………………………………………………………….	71
Figure 5-35 Remove the media input tray (3 of 3) ……………………………………………………………………………….	72
Figure 5-36 Remove the transfer roller ………………………………………………………………………………………………	73
Figure 5-37 Remove the side covers (1 of 4) ………………………………………………………………………………………	74
Figure 5-38 Remove the side covers (2 of 4) ………………………………………………………………………………………	74
Figure 5-39 Remove the side covers (3 of 4) ………………………………………………………………………………………	75
Figure 5-40 Remove the side covers (4 of 4) ………………………………………………………………………………………	75
Figure 5-41 Remove the print-cartridge door (1 of 2) ……………………………………………………………………………	76
Figure 5-42 Remove the print-cartridge door (2 of 2) ……………………………………………………………………………	76
Figure 5-43 Remove the rear cover and fuser cover (1 of 3) …………………………………………………………………	77
Figure 5-44 Remove the rear cover and fuser cover (2 of 3) …………………………………………………………………	77
Figure 5-45 Remove the rear cover and fuser cover (3 of 3) …………………………………………………………………	78
Figure 5-46 Remove the front cover (1 of 4) ……………………………………………………………………………………….	79
Figure 5-47 Remove the front cover (2 of 4) ……………………………………………………………………………………….	79
Figure 5-48 Remove the front cover (3 of 4) ……………………………………………………………………………………….	80
Figure 5-49 Remove the front cover (4 of 4) ……………………………………………………………………………………….	80
Figure 5-50 Remove the formatter …………………………………………………………………………………………………….	81
Figure 5-51 Remove the power supply (1 of 7) ……………………………………………………………………………………	82
Figure 5-52 Remove the power supply (2 of 7) ……………………………………………………………………………………	82
Figure 5-53 Remove the power supply (3 of 7) ……………………………………………………………………………………	83
Figure 5-54 Remove the power supply (4 of 7) ……………………………………………………………………………………	83
Figure 5-55 Remove the power supply (5 of 7) ……………………………………………………………………………………	84
Figure 5-56 Remove the power supply (7 of 7) ……………………………………………………………………………………	84
Figure 5-57 Remove the power supply (7 of 7) ……………………………………………………………………………………	85
Figure 5-58 Remove the scanner support frame (1 of 5) ………………………………………………………………………	86
Figure 5-59 Remove the scanner support frame (2 of 5) ………………………………………………………………………	87
Figure 5-60 Remove the scanner support frame (3 of 5) ………………………………………………………………………	87
Figure 5-61 Remove the scanner support frame (4 of 5) ………………………………………………………………………	88
Figure 5-62 Remove the scanner support frame (5 of 5) ………………………………………………………………………	88
Figure 5-63 Remove the laser/scanner (1 of 7) ……………………………………………………………………………………	89
Figure 5-64 Remove the laser/scanner (2 of 7) ……………………………………………………………………………………	90
Figure 5-65 Remove the laser/scanner (3 of 7) ……………………………………………………………………………………	90
Figure 5-66 Remove the laser/scanner (4 of 7) ……………………………………………………………………………………	91
Figure 5-67 Remove the laser/scanner assembly (5 of 7) …………………………………………………………………….	91
Figure 5-68 Remove the laser/scanner assembly (6 of 7) …………………………………………………………………….	92
Figure 5-69 Remove the laser/scanner assembly (7 of 7) …………………………………………………………………….	92
Figure 5-70 Remove the main motor (1 of 4) ………………………………………………………………………………………	93
Figure 5-71 Remove the main motor (2 of 4) ………………………………………………………………………………………	94
Figure 5-72 Remove the main motor (3 of 4) ………………………………………………………………………………………	94
Figure 5-73 Remove the main motor (4 of 4) ………………………………………………………………………………………	95
Figure 5-74 Remove the fuser (1 of 6) ……………………………………………………………………………………………….	96

Figure 5-75 Remove the fuser (2 of 6) ……………………………………………………………………………………………….	97
Figure 5-76 Remove the fuser (3 of 6) ……………………………………………………………………………………………….	97
Figure 5-77 Remove the fuser (4 of 6) ……………………………………………………………………………………………….	98
Figure 5-78 Remove the fuser assembly (5 of 6) …………………………………………………………………………………	98
Figure 5-79 Remove the fuser assembly (6 of 6) …………………………………………………………………………………	99
Figure 5-80 Remove the paper-pickup assembly (1 of 4) ……………………………………………………………………	100
Figure 5-81 Remove the paper-pickup assembly (2 of 4) ……………………………………………………………………	101
Figure 5-82 Remove the paper-pickup assembly (3 of 4) ……………………………………………………………………	101
Figure 5-83 Remove the paper-pickup assembly (4 of 4) ……………………………………………………………………	102
Figure 5-84 Remove the drive-gear assembly and drive belt (1 of 4). …………………………………………………..	103
Figure 5-85 Remove the drive-gear assembly and drive belt (2 of 4). …………………………………………………..	103
Figure 5-86 Remove the drive-gear assembly and drive belt (3 of 4). …………………………………………………..	104
Figure 5-87 Remove the Drive-gear assembly and drive belt (4 of 4). ………………………………………………….	104
Figure 6-1 Print-cartridge high-voltage connection points (right side) ……………………………………………………	133
Figure 6-2 Print-cartridge high-voltage connection points (left side) ……………………………………………………..	134
Figure 6-3	Formatter connectors ……………………………………………………………………………………………………..	142
Figure 6-4	ECU connectors …………………………………………………………………………………………………………….	143
Figure 6-5 Solenoid and motor ………………………………………………………………………………………………………..	144
Figure 6-6	Rollers ………………………………………………………………………………………………………………………….	145
Figure 6-7	Sensors ………………………………………………………………………………………………………………………..	146
Figure 6-8	Major components …………………………………………………………………………………………………………	147
Figure 6-9 PCAs (base unit) ……………………………………………………………………………………………………………	148
Figure 6-10	Circuit diagram ……………………………………………………………………………………………………………	149
Figure 7-1	Scanner assemblies ……………………………………………………………………………………………………….	164
Figure 7-2	Assemblies ……………………………………………………………………………………………………………………	166
Figure 7-3 External covers and panels …………………………………………………………………………………………….	168
Figure 7-4 Internal components (1 of 3) ……………………………………………………………………………………………	170
Figure 7-5 Internal components (2 of 3) ……………………………………………………………………………………………	172
Figure 7-6 Internal components (3 of 3) ……………………………………………………………………………………………	174

1 Product information

●Quick access to product information

●Product comparison

●Product features

●Product walkaround

●Software description

●Software for Windows

●Software for Macintosh

●Uninstall software

●Media specifications

Quick access to product information

Use the following Web site to find information about the product.

●www.hp.com/support/LJM1120

Table 1-1 Product guides

Guide	Description

HP LaserJet M1120 MFP Getting	Provides step-by-step instructions for installing and setting up the product.
Started Guide

HP LaserJet M1120 MFP Series	Provides detailed information for using the product and problem-solving. Available on the
User Guide	product CD or in Program Group if the software is installed on a computer.

Online Help	Provides information about options that are available in the printer drivers. To view a Help
	file, open the online Help through the printer driver.

2 Chapter 1 Product information

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Product comparison

The product is available in the following configurations.

	Base models	Network models

	● Print letter-size pages at speeds up to 20 pages per	Base model, plus:
	minute (ppm) and A4-size pages at speeds up to 19 ppm.	● 10/100 Base-T Ethernet network port.
	● Priority input tray holds up to 10 sheets of print media.
	● IPv4 network protocol.

●Tray 1 holds up to 250 sheets of print media or 10

envelopes.

●

IPv6 network protocol.

●Manual two-sided (duplex) printing and copying.

●Hi-Speed USB 2.0 port.

●32-megabyte (MB) random-access memory (RAM).

●Flatbed scanner.

ENWW	Product comparison 3

Product features

Print	● Prints letter-size pages at speeds up to 20 ppm and A4-size pages at speeds up to 19 ppm.
	● Prints at 600 dots per inch (dpi) and FastRes 1200 dpi.
	● Includes adjustable settings to optimize print quality.

Copy	● Copies at 300 dots per inch (dpi).

Memory	● Includes 32 MB RAM.

Paper handling	● Priority input tray holds up to 10 pages.
	● Tray 1 holds up to 250 sheets of print media or 10 envelopes.
	● Output bin holds up to 100 sheets of print media.

Scan	● Provides 1200 pixels per inch (ppi) full-color scanning.

Printer driver features	● FastRes 1200 produces 1200-dots-per-inch (dpi) print quality for fast, high-quality printing
	of business text and graphics.

Interface connections	● All models include a Hi-Speed USB 2.0 port.
	● Network models include a 10/100 Base-T Ethernet network port.

Economical printing	● Provides N-up printing (printing more than one page on a sheet).
	● Provides an EconoMode setting, which uses less toner.

Supplies	● Uses a print cartridge that has a no-shake design.
	● The product ships with a 1,000-page (average yield) starter cartridge. The average yield
	for replacement cartridges is 2,000 pages.

Accessibility	● Online user guide is compatible with text screen-readers.
	● Print cartridges can be installed and removed by using one hand.
	● All doors and covers can be opened by using one hand.

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Product walkaround

Front view

1 2

4 6 5

1Scanner lid

2Control panel

3Print-cartridge door latch

4Output bin

5Priority input tray

6Tray 1

Back view

7Interface ports

8Power switch

9Power connector

ENWW	Product walkaround 5

Interface ports

All models have a Hi-Speed USB 2.0 port, and network models also have a 10/100 Base-T Ethernet port.

1 2

1Hi-Speed USB 2.0 port

2Ethernet port (network models only)

Serial number and model number location

The serial number and product model number label is on the rear of the product.

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Software description

Supported operating systems

The product supports the following operating systems:

Full software installation	Print and scan drivers only
●	Windows XP (32-bit)	●	Windows XP (64-bit)
●	Windows Vista (32-bit)	●	Windows Vista	(64-bit)
●	Windows 2000	● Windows 2003	Server (64-bit)

●Windows 2003 Server (32-bit)

●Mac OS X v10.3, v10.4, and later

NOTE: For Mac OS X v10.4 and later, PPC and Intel Core Processor Macs are supported.

Supported printer drivers

The product comes with software for Windows and Macintosh that allows the computer to communicate with the product. This software is called a printer driver. Printer drivers provide access to product features, such as printing on custom-sized paper, resizing documents, and inserting watermarks.

NOTE: The most recent drivers are available at www.hp.com/support/LJM1120. Depending on the configuration of Windows-based computers, the installation program for the product software automatically checks the computer for Internet access in order to obtain the latest drivers.

Software included with the product

There are several options for completing a recommended install. Easy installation will complete the installation with default settings. Advanced installation allows you to review the license agreements and the default settings.

Easy installation for Windows

●HP drivers

◦Printer driver

◦Scan driver

●HP MFP software

◦HP LaserJet Scan program

◦Uninstall program

●HP Update program

●HP Customer Participation program

ENWW	Software description 7

●Shop for HP Supplies program

●Other programs

◦ Readiris OCR (not installed with other software; separate installation is required)

Advanced installation

Advanced installation includes all of the features that are available with the easy installation. The HP Customer Participation program is optional.

Macintosh software

●HP Product Setup Assistant

●HP Uninstaller

●HP LaserJet software

◦HP Scan

◦HP Director

◦Scan to e-mail program

◦HP Photosmart

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Software for Windows

Embedded Web server (network models only)

Network models are equipped with an embedded Web server, which provides access to information about device and network activities. This information appears in a Web browser, such as Microsoft Internet Explorer, Netscape Navigator, Apple Safari, or Firefox.

The embedded Web server resides on the device. It is not loaded on a network server.

The embedded Web server provides an interface to the device that anyone who has a networkconnected computer and a standard Web browser can use. No special software is installed or configured, but you must have a supported Web browser on your computer. To gain access to the embedded Web server, type the IP address for the device in the address line of the browser. (To find the IP address, print a configuration page.)

Status Alerts software

The Status Alerts software provides information about the current status of the product.

The software also provides pop-up alerts when certain events occur, such as an empty tray or a problem with the product. The alert includes information about solving the problem.

Other Windows components and utilities

●Software installer — automates the printing system installation

●Online Web registration

ENWW	Software for Windows 9

Software for Macintosh

Embedded Web server (network models only)

The embedded Web server resides on the device. It is not loaded on a network server.

HP Director

HP Director is a software program for working with documents. HP Director appears on the computer screen to initiate scanning, or to change settings on the product through Macintosh Configure Device.

Also included is the HP product Setup Assistant, which sets up the print queue.

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Uninstall software

Windows

1.Click Start, and then click All Programs.

2.Click HP, and then click HP LaserJet M1120.

3.Click Uninstall, and then follow the onscreen instructions to remove the software.

Macintosh

To remove the software, drag the PPD files to the trash can.

ENWW	Uninstall software 11

Media specifications

Supported paper and print media sizes

This product supports a number of paper sizes, and it adapts to various media.

NOTE: To obtain best print results, select the appropriate paper size and type in the print driver before printing.

Table 1-2 Supported paper and print media sizes

Size	Dimensions	Priority input tray	Tray 1

Letter	216 x 279 mm (8.5 x 11 in)

Legal	216 x 356 mm (8.5 x 14 in)

A4	210 x 297 mm (8.27 x 11.69 in)

Executive	184 x 267 mm (7.24 x 10.51 in)

A3	297 x 420 mm (11.69 x 16.54 in)

A5	148 x 210 mm (5.83 x 8.27 in)

A6	105 x 148 mm (4.13 x 5.83 in)

B5 (JIS)	182 x 257 mm (7.17 x 10.12 in)

16k	197 x 273 mm (7.75 x 10.75 in)

16k	195 x 270 mm (7.7 x 10.6 in)

16k	184 x 260 mm (7.25 x 10.25 in)

8.5 x 13	216 x 330 mm (8.5 x 13 in)

4 x 61	107 x 152 mm (4 x 6 in)

5 x 81	127 x 203 mm (5 x 8 in)

10 x 15 cm1	100 x 150 mm (3.9 x 5.9 in)

Custom	Priority input tray: Minimum—76 x 127 mm (3 x
	5 in); Maximum—216 x 356 mm (8.5 x 14 in)

1 These sizes are supported as custom sizes.

Table 1-3 Supported envelopes and postcards

Size	Dimensions	Priority input tray	Tray 1

Envelope #10	105 x 241 mm (4.13 x 9.49 in)

Envelope DL	110 x 220 mm (4.33 x 8.66 in)

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Table 1-3 Supported envelopes and postcards (continued)

Size	Dimensions	Priority input tray	Tray 1

Envelope C5	162 x 229 mm (6.93 x 9.84 in)

Envelope B5	176 x 250 mm (6.7 x 9.8 in)

Envelope Monarch	98 x 191 mm (3.9 x 7.5 in)

Postcard	100 x 148 mm (3.94 x 5.83 in)

Double postcard	148 x 200 mm (5.83 x 7.87 in)

Supported paper types and tray capacity

This product has the following tray priority for feeding print media:

1.Priority input tray

2.Tray 1

Minimum media dimensions are 76 x 127 mm (3 x 5 in).

Maximum media dimensions are 216 x 356 mm (8.5 x 14 in).

To obtain the best print results, change the paper size and paper type settings in the printer driver before printing.

Table 1-4 Supported paper types and tray capacity

Type is	Media specifications	Priority input tray	Tray 1 capacity1
Plain	75 g/m2 (20 lb) to 104 g/m2 (27 lb)	Up to 10 sheets	Up to 250 sheets
Color
Preprinted
Prepunched
Recycled

Light	60 g/m2 (16 lb) to 75 g/m2 (20 lb)	Up to 10 sheets	Up to 260 sheets
Envelopes	Less than 90 g/m2 (24 lb)	1 envelope	Up to 10 envelopes.
Labels	Standard	1 sheet	Not supported.

Bond	75 g/m2 (20 lb) to 104 g/m2 (27 lb)	1 sheet	Up to 250 sheets
Rough	75 g/m2 (20 lb) to 104 g/m2 (27 lb)	1 sheet	Up to 200 sheets
Transparencies	4 mm (0.1 in) Monochrome	1 sheet	Up to 200 sheets.
	Overhead

Heavy	110 g/m2 (29 lb) to 125 g/m2	Up to 10 sheets	Not supported.
	(33 lb)

Letterhead	75 g/m2 (20 lb) to 104 g/m2 (27 lb)	Up to 10 sheets	Up to 250 sheets

1 The maximum stack height for tray 1 is 25 mm (1 inch).

ENWW	Media specifications 13

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2 Installation

●Site preparations

●What was in the box

●Install input devices

●Install supplies

Site preparations

Operating environment

Place the product on a sturdy, level surface in a well-ventilated area. Make sure that the air vents are not blocked and that the product is installed away from direct sunlight, open flames, and ammonia fumes.

Store or install the product in an area that meets the following requirements:

●Temperature (printer; operating) 15o to 32.5o C (59o to 90.5o F)

●Temperature (printer; storage) -20o to 60oC (-4o to 140oF)

●Humidity (printer; operating) 10% to 80% relative humidity (no condensation)

●Humidity (printer; storage) 10% to 90% relative humidity (no condensation)

●Temperature (toner cartridge; storage) -20o to 40o C (-4o to 104o F)

●Humidity (toner cartridge; storage) 10% to 90% relative humidity (no condensation)

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Minimum system requirements

●Windows® 2000

●Windows XP

●Windows Server 2003

●Windows Vista

●Mac OS X v10.3 and later

●128 MB RAM for Windows operating systems

●32 MB RAM for Macintosh operating systems

●250 MB hard-disk space (full installation)

●CD-ROM drive

●USB port

ENWW	Site preparations 17

What was in the box

The following components are included in the box.

NOTE: The USB and network cables are not included.

		5
	2	3

		7
		6
	1	4
	8

Item Description

1HP LaserJet M1120 MFP

2Print cartridge

3Control-panel faceplate (if not already installed)

4Output bin extension

5Start guide and support flyer

6CD-ROMs (software and online user guide)

7Power cord

8Tray 1

18 Chapter 2 Installation

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Install input devices

Priority input tray

The priority input tray is accessed from the front of the product. The product prints from the priority input tray before attempting to print from tray 1.

Media guides ensure that the media is correctly fed into the product and that the print is not skewed (crooked on the media). When loading media, adjust the media guides to match the width of the media that you are using.

ENWW	Install input devices 19

Tray 1

1.Push tray 1 into the product.

2.Open the tray cover, and then adjust the media guides out.

3.Load the paper in the tray, snug the media guides against the stack, and then close the tray cover.

20 Chapter 2 Installation

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Install supplies

Install the print cartridge

1.Open the print-cartridge door.

2.Remove the new print cartridge from its packaging, and then rock the print cartridge back and forth.

3.Remove the orange cover from the print cartridge, and then pull the orange tab straight out to remove the sealing tape.

4.Insert the cartridge into the product until it is firmly in place.

5.Close the print-cartridge door.

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3 Maintenance

●Manage supplies

●Clean the product

●Management tools

Manage supplies

Inspect any parts that wear when servicing the product. Replace them as needed, based on failure or wear rather than usage.

The following table lists approximate schedules for replacing consumables.

Life expectancies of supplies

Item	Capacity

HP LaserJet M1120 MFP Series	Recommended maximum of 3,000 pages per month

Print cartridge	2,000 pages1 (standard)

1 For information about the yield for the cartridges, see www.hp.com/go/pageyield. Actual yield depends on specific use.

Check and order supplies

Hewlett-Packard recommends that you place an order for a replacement print cartridge when the Low message for a print cartridge first appears. Use a new, authentic HP print cartridge to obtain the following types of supplies information:

●Amount of cartridge life remaining

●Estimated number of pages remaining

●Number of pages printed

●Other supplies information

Store supplies

Follow these guidelines for storing print cartridges:

●Do not remove the print cartridge from its package until you are ready to use it.

CAUTION: To prevent damage, do not expose the print cartridge to light for more than a few minutes.

●See Environmental specifications on page 187 for operating and storage temperature ranges.

●Store the supply in a horizontal position.

●Store the supply in a dark, dry location away from heat and magnetic sources.

24 Chapter 3 Maintenance

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Replace supplies

Print cartridge

1.Open the print-cartridge door.

2.Grasp the handle on the print cartridge, and then pull the cartridge straight out to remove it. See the recycling information inside the print cartridge box.

3.Remove the new print cartridge from its packaging, and then rock the print cartridge back and forth.

4.Remove the orange cover from the print cartridge, and then pull the orange tab straight out to remove the sealing tape.

5.Insert the cartridge into the product until it is firmly in place.

6.Close the print-cartridge door.

CAUTION: If toner gets on any clothing, wipe it off with a dry cloth and wash the clothing in cold water.

Hot water sets toner into the fabric.

HP policy on non-HP supplies

Hewlett-Packard Company cannot recommend the use of non-HP supplies, either new or remanufactured. Because they are not HP products, HP cannot influence their design or control their quality. Service or repairs required as a result of using a non-HP supply will not be covered under the warranty.

26 Chapter 3 Maintenance

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HP fraud hotline

Call the HP fraud hotline if the product indicates that the print cartridge is not an HP print cartridge and you think that it is genuine. HP will help determine if the product is genuine and take steps to resolve the problem.

The print cartridge might not be a genuine HP one if you notice the following issues:

●You are experiencing a large number of problems with the print cartridge.

●The print cartridge does not look like it usually does (for example, the pull tab or the box is different).

In the United States, call toll-free: 1-877-219-3183.

Outside the United States, you can call collect. Dial the operator and ask to place a collect call to this telephone number: 1-770-263-4745. If you do not speak English, a representative at the HP fraud hotline who speaks your language will assist you. Or, if someone who speaks your language is not available, a language line interpreter will connect approximately one minute after the beginning of the call. The language line interpreter is a service that will translate between you and the representative for the HP fraud hotline.

Clean the product

Clean the exterior

Use a soft, damp, lint-free cloth to wipe dust, smudges, and stains off of the exterior of the product.

Clean the flatbed scanner glass

Dirty glass, from fingerprints, smudges, hair, and so on, slows down performance and affects the accuracy of special features such as fit-to-page and copy.

1.Turn off the product, unplug the power cord from the electrical outlet, and raise the scanner cover.

2.Clean the glass by using a soft cloth or sponge that has been moistened with nonabrasive glass cleaner.

CAUTION: Do not use abrasives, acetone, benzene, ammonia, ethyl alcohol, or carbon tetrachloride on any part of the product; these can damage the product. Do not place liquids directly on the glass. They might seep under it and damage the product.

Clean the lid backing

Minor debris can accumulate on the white document lid backing that is located underneath the product lid.

1.Turn off the product, unplug the power cord, and raise the lid.

2.Clean the white document lid backing by using a soft cloth or sponge that has been moistened with a mild soap and warm water. Wash the backing gently to loosen debris; do not scrub the backing.

28 Chapter 3 Maintenance

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3.Dry the backing by using a chamois or soft cloth.

CAUTION: Do not use paper-based wipes because they might scratch the backing.

4.If this does not clean the backing well enough, repeat the previous steps and use isopropyl alcohol to dampen the cloth or sponge, and then wipe the backing thoroughly with a damp cloth to remove any residual alcohol.

Clean the paper path

During the printing process, paper, toner, and dust particles can accumulate inside the product. Over time, this buildup can cause print-quality problems such as toner specks or smearing. This product has a cleaning mode that can correct and prevent these types of problems.

Specks	Smearing

1.Press Setup.

2.Use the arrow buttons to find the Service menu, and then press OK.

3.Use the arrow buttons to find Cleaning mode, and then press OK.

4.Load plain letter or A4 paper when you are prompted.

5.Press OK again to confirm and begin the cleaning process.

A page feeds through the product slowly. Discard the page when the process is completed.

ENWW	Clean the product 29

Management tools

Information pages

Information pages reside within the product memory. These pages help diagnose and solve problems with the product.

NOTE: If the product language was not correctly set during installation, you can set the language manually so the information pages print in one of the supported languages. Change the language by using the System setup menu on the control panel or the embedded Web server (network models only).

Page description	How to print the page

Demo page	1.	On the product control panel, press Setup.
Contains examples of text and graphics.	2.	Use the arrow buttons to select Reports, and then press
		OK.
	3.	Use the arrow buttons to select Demo page, and then
		press OK.

Menu map	1.	On the product control panel, press Setup.
Shows the control-panel menus and available settings.	2.	Use the arrow buttons to select Reports, and then press
		OK.
	3.	Use the arrow buttons to select Menu structure, and then
		press OK.

Configuration page	1.	On the product control panel, press Setup.
Shows the current settings and product properties.	2.	Use the arrow buttons to select Reports, and then press
		OK.
	3.	Use the arrow buttons to select Config report, and then
		press OK.

Embedded Web server

This product is equipped with an embedded Web server (EWS), which provides access to information about product and network activities. A Web server provides an environment in which web programs may run, much in the same way that an operating system, such as Windows, provides an environment for programs to run on a computer. The output from these programs can then be displayed by a Web browser, such as Microsoft Internet Explorer, Safari, or Netscape Navigator.

An “embedded” Web server resides on a hardware device (such as an HP LaserJet product) or in firmware, rather than as software that is loaded on a network server.

The advantage of an EWS is that it provides an interface to the product that anyone with a networkconnected product and computer can use. There is no special software to install or configure, but you must have a supported Web browser on the computer. To gain access to the EWS, type the IP address for the product in the address line of the browser. (To find the IP address, print a configuration page.)

NOTE: For Macintosh operating systems, you can use the EWS over a USB connection after installing the Macintosh software included with the product.

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Features

The EWS allows you to view product and network status and manage printing functions from a computer. With the EWS, you can complete the following tasks:

●View product status information

●Determine the remaining life on all supplies and order new ones

●View and change part of the product configuration

●View and print some internal pages

●Select the language in which to display the EWS pages

●View and change network configuration

●Set, change, or clear the product security password

NOTE: Changing network settings in the EWS might disable some of product software or features.

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4 Operational theory

●Basic operation

●Scanner functions and operation

●Internal components (base unit)

●Engine control system

●Laser/scanner system

●Pickup/feed/delivery system

●Image-formation system

Basic operation

This chapter presents an overview of the relationships between major components in the product, and includes a detailed discussion of the image-formation system. The following systems are discussed:

●Engine control system

●Laser/scanner system

●Pickup/feed/delivery system

●Image-formation system

Figure 4-1 System block diagram

Sequence of operation for the base unit

Operational sequences are controlled by the microprocessor on the DC controller.

Table 4-1 Sequence of operation

WAIT	From power-on until the end of the main-motor initial
	drive

Detects the presence of a print cartridge; clears potential from the drum surface and cleans the transfer roller

STBY (standby)	From the end of the WAIT or LSTR period until either	Prepares the product to receive print commands
	a print command is sent from the formatter or the
	power is turned off

INTR (initial	From the time of the print command until the pickup	Prepares the photosensitive drum for printing
rotation)	solenoid is turned on

34 Chapter 4 Operational theory

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File Specifications:

413/413288-laserjet_m1120__multifunction_printer.pdf file (14 Jun 2023)

Accompanying Data:

HP LaserJet M1120 MFP Series All in One Printer PDF Service Manual (Updated: Wednesday 14th of June 2023 10:46:38 PM)

Rating: 4.7 (rated by 36 users)

Compatible devices: Color LaserJet Pro M252, Photosmart C6300 — All-in-One Printer, LaserJet M4349 — Multifunction Printer, 4730mfp, 410, Officejet 4315, LaserJet Enterprise MFP M725, M3027.

Service Manual (Text Version):

(Ocr-Read Summary of Contents of some pages of the HP LaserJet M1120 MFP Series Document (Main Content), UPD: 14 June 2023)

130, 6. Replace the print cartridge and close the print-cartridge door. 114 Chapter 6 Problem solve ENWW
…
79, 7. Grasp the tab on the gear-drive arm bracket and carefully flex it away from the scanner assembly to release the bracket. Figure 5-19 Remove the scanner assembly (7 of 10) 8. Push the bracket toward the right side of the product until its mounting tabs clear the holes in the scanner assembly. Figure 5-20 Remove the scanner assembly (8 of 10) ENWW Scanner assembly 63
…
188, Internal components (2 of 3) Figure 7-5 Internal components (2 of 3) 2 3 4 1 5 6 172 Chapter 7 Parts ENWW
…
113, 3. Disconnect two wire-harness connectors (callout 3; J102, and J552) and remove the harnesses from the retainer (callout 4). NOTE: You might need to disconnect and remove the other wire harnesses to remove the required harness from the retainer. Figure 5-75 Remove the fuser (2 of 6) 4 3 4. Release the wire harness from the retainer near the top of the fuser (callout 5) and disconnect the ground wire (callout 6) from the back of the product. Figure 5-76 Remove the fuser (3 of …
157, Interface ports All models have a Hi-Speed USB 2.0 port. The HP LaserJet M1120n also has a 10/100 Base-T (RJ-45) network port. 1 2 1 Hi-Speed USB 2.0 port 2 Network port (HP LaserJet M1120n only) ENWW Problem-solving diagrams 141
…
80, 9. Use a small flat-blade screwdriver to release the tabs on each link assembly. WARNING! When the links are disengaged, the scanner assembly can easily fall off of the product base if it is rotated too far toward the back of the product. CAUTION: Do not push too hard on the link tabs or the tabs might break. Figure 5-21 Remove the scanner assembly (9 of 10) 10. Rotate the scanner assembly toward the rear of the product until the rear hinges …
95, Front cover 1. Remove the right-side and left-side covers. See Side covers on page 74. 2. Release the lower left-side front-cover locking tab and slightly pry the lower-left corner of the front cover away from the product. Figure 5-46 Remove the front cover (1 of 4) 3. Release the lower right-side front-cover locking tab (located near the corner of the power supply) and slightly pry the lower-right corner of the front cover away from the product. Figure 5-47 Remove the front cover (2 …
206, FCC compliance This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy. If it is not installed and used in accordance with the instructions, it may cause harmful interference to r…
77, 3. Release the bottom tab (callout 2). Figure 5-15 Remove the scanner assembly (3 of 10) 2 4. Rotate the back side of the cover away from the product, and then slide the cover toward the front of the product to remove it. Figure 5-16 Remove the scanner assembly (4 of 10) 2 1 ENWW Scanner assembly 61
…
100, HP LaserJet M1120 MFP Series 6. Release the wire harness from the retainer (callout on the power supply. Figure 5-55 Remove the power supply (5 of 7) 8 7. Unclip two clips (callout 9) and remove one plastic bracket (callout 10). CAUTION: The wire harness (callout 11) attached to the bracket is not captive. Do not lose this wire harness when the bracket is removed. Figure 5-56 Remove the power supply (7 of 7) 9 11 10 84 Chapter 5 Removal and replacement ENWW
…
139, Problem Example Cause Solution The printed page contains wrinkles or creases. The media might be loaded incorrectly or the input tray might be too full. Turn over the stack of paper in the input tray, or try rotating the paper 180° in the input tray. Verify that the media is loaded correctly and that the media guides are not too tight or too loose against the stack. See Install input devices on page 19. The media might not me…
123, Step number Verification step Possible problems Solutions 6 Does the product scan to the computer? Initiate a scan from the basic desktop software at your computer. The cable is not connected correctly. Reconnect the cable. Software is not installed correctly or an error occurred during software installation. Uninstall and then reinstall the product software. Verify that you are using the correct installation procedure …
133, Avoid repeated jams ● Verify that the input tray is not overfilled. The input tray capacity varies depending on the type of print media that you are using. ● Verify that the media guides are properly adjusted. ● Check that the input tray is securely in place. ● Do not add print media into the input tray while the product is printing. ● Use only HP-recommended media types and sizes. ● Do not fan media prior to loading it in a tray. To l…
88, 3. Depress the pickup-tray locking tabs to release the media input tray, and then pull it out and away from the product. Figure 5-35 Remove the media input tray (3 of 3) 72 Chapter 5 Removal and replacement ENWW
…
111, 5. Remove two screws (callout 6). Carefully slip the main-motor drive belt off of the motor shaft (callout 7), and then remove the main motor. Figure 5-73 Remove the main motor (4 of 4) 6 7 TIP: When the main motor is reinstalled, make sure that the wire harness is located toward the top of the motor so that the harness can be correctly positioned in the retainers on the motor PCA mounting bracket. When you reinstall the main-motor drive belt, make sure that it is correctly pos…

HP LaserJet M1120 MFP Series User Manual
HP LaserJet M1120 MFP Series User Guide
HP LaserJet M1120 MFP Series PDF Manual
HP LaserJet M1120 MFP Series Owner’s Manuals

Recommended: VCWB300, EAS23, MMP8001 Series, MultiConnect mDotT

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HP LaserJet M1120 MFP Series — Service Manual. www.s

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Table of Contents for HP LaserJet M1120 MFP Series:

List of tables Table 1-1 Product guides ………………………………………………………………………………………………………………….. 2 Table 1-2 Supported paper and print media sizes ………………………………………………………………………………. 12 Table 1-3 Supported envelopes and postcards …………………………………….
HP LaserJet M1120 MFP Service Manual HP LaserJet M1120 MFP Service Manual HP LaserJet M1120 MFP Service Manual HP LaserJet M1120 MFP Service Manual HP LaserJet M1120 MFP Service Manual HP LaserJet M1120 MFP Service Manual HP LaserJet M1120 MFP Service Manual HP LaserJet M1120 MFP Service Manual HP LaserJet M1120 MFP Service Manual
input tray loading media 19 install tray 1 20 installation, software advanced 8 easy 7 installing Windows software 7 installing hardware scanner cushions 70 interface ports cables, ordering 152 locating 6, 141 types included 4 internal components 38 internal components, part numbers 170 J jams causes of 111 locating 112 output-bin, clearing 115 preventing 117 print cartridge area, clearing 116 trays, clearing 112 K Korean EMI statement 195 L laser safe
HP LaserJet M1120 MFP Series Service Manual
Index Symbols/Numerics 600 dpi print-quality setting 118 A accessibility features 4 accessories part numbers 152 acoustic emissions 187 advanced software installation 8 after service checklist 50 alert messages 108 archive print setting 138 assemblies high-voltage connector, cleaning 134 part numbers 166 B background shading, troubleshooting 121 bands and streaks, troubleshooting 120 batteries included 192 before service checklist 49 bin, output capacity 4 jams, clearing 115 locating 5 blank copies, troubleshooting 130 blank scan
External covers and panels ……………………………………………………………………………………………….. 168 Internal components (1 of 3) ……………………………………………………………………………………………… 170 Internal components (2 of 3) ……………………………………………………………………………………………… 172 Internal components (3 of 3) …………………………………..
Table of contents 1 Product information Quick access to product information ………………………………………………………………………………………. 2 Product comparison …………………………………………………………………………………………………………….. 3 Product features ………………………………………………………………………………………………………………….. 4 Product walkaround ……………………………………….
media detection 42 scanner operations 36 separation pad replacing 66 separation pad, locating 38 separation pads diagrams 147 sequence of operations 34 serial number, locating 6 service critical error messages 109 part numbers 152 repacking device 184 secondary menu 135 service agreements 184 Service menu 138 servicing 49 servicing product 48 settings configuration page 137 factory-set defaults, restoring 138 NVRAM initialization 135 shipping device 184 side covers
6 Problem solve ● Problem-solving checklist ● Control-panel messages ● Clear jams ● Print problems ● Scan problems ● Copy problems ● Functional checks ● Service-mode functions ● Problem-solving tools ● Problem-solving diagrams ● Firmware updates ENWW 105
Image problems ………………………………………………………………………………………………… 127 Media-handling problems …………………………………………………………………………………… 128 Performance problems ………………………………………………………………………………………. 130 Functional checks …………………………………………………………………..
7Parts ● Ordering information ● Supplies and hinge tool ● Cable and interface accessories ● Whole-unit replacement ● Control-panel overlays ● Supplementry documentation and support ● Parts lists and diagrams ● Scanner assemblies ● Assemblies ● External covers and panels ● Internal components (1 of 3) ● Internal components (2 of 3) ● Internal components (3 of 3) ● Alphabetical parts list ● Numerical

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1 Product information

Quick access to product information

Product comparison

Product features

Product walkaround

Front view

Back view

Interface ports

Serial number and model number location

Software description

Supported operating systems

Supported printer drivers

Software included with the product

Easy installation for Windows

Advanced installation

Macintosh software

Software for Windows

Embedded Web server (network models only)

Status Alerts software

Other Windows components and utilities

Software for Macintosh

Embedded Web server (network models only)

HP Director

Uninstall software

Windows

Macintosh

Media specifications

Supported paper and print media sizes

Supported paper types and tray capacity

2 Installation

Site preparations

Operating environment

Minimum system requirements

What was in the box

Install input devices

Priority input tray

Tray 1

Install supplies

Install the print cartridge

3 Maintenance

Manage supplies

Life expectancies of supplies

Check and order supplies

Store supplies

Replace supplies

Print cartridge

HP policy on non-HP supplies

HP fraud hotline

Clean the product

Clean the exterior

Clean the flatbed scanner glass

Clean the lid backing

Clean the paper path

Management tools

Information pages

Embedded Web server

Features

4 Operational theory

Basic operation

Sequence of operation for the base unit

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Service Manual (Text Version):

Recommended: VCWB300, EAS23, MMP8001 Series, MultiConnect mDotT

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