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HP LaserJet Pro CP1025 Service Manual - Page 101

Solve image-quality problems

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Problem Sample White spots appear in an image The back of the page is dirty. Vertical streaks or bands appear on the page. Vertical white lines appear in a particular color. Vertical white lines appear in all colors. ENWW Cause Solution The static charge eliminator is Clean the static charge eliminator. dirty. The T1 pad is deformed or has deteriorated. Replace the ITB. The secondary transfer roller is deformed or has deteriorated. Replace the secondary transfer roller. The secondary transfer roller is dirty. Replace the secondary transfer roller. The fuser inlet guide or separation guide is dirty. Clean the dirty parts. If the dirt does not come off, replace the fuser delivery assembly. The pressure roller is dirty. Run the cleaning page several times. If the dirt does not come off, replace the fuser delivery assembly. Scratches are present on the circumference of the photosensitive drum. Replace the imaging-drum-cartridge. Scratches are present on the circumference of the fuser roller. Replace the fuser delivery assembly. Scratches are present on the circumference of the ITB. Replace the ITB. The ITB drive roller is deformed or has deteriorated. The ITB cleaning mechanism is malfunctioning. The laser beam window is dirty. Clean the window and remove any foreign substances. Scratches are present on the circumference of the developing roller. Replace the developing cartridge for affected color. The laser/scanner-unit mirror is dirty. Replace the product. Horizontal scratches on the fuser film. Replace the fuser delivery assembly. Scratches are present on the circumference of the ITB. Replace the ITB. Scratches are present on the circumference of the photosensitive drum. Replace the imaging-drum-cartridge. No scratches are present on Replace the ITB. any of the components above. Solve image-quality problems 85

Section	Page
Removal and replacement	17
Introduction	18
Removal and replacement strategy	18
Electrostatic discharge	19
Required tools	19
Service approach	20
Before performing service	20
After performing service	20
Post-service test	20
Print-quality test	20
Parts removal order	21
Removal and replacement procedures	22
Replace the print cartridges	22
Replace the imaging drum	25
Input tray	29
Secondary transfer roller	30
Separation pad assembly	31
Remove the separation pad assembly	31
Pickup roller	32
Remove the pickup roller assembly	33
Covers	34
Right cover assembly	34
Remove the right cover assembly	34
Left cover assembly	35
Remove the left cover assembly	35
Top door assembly	36
Remove the top door assembly	36
Rear top cover assembly	38
Remove the rear top cover assembly	38
Rear door assembly	39
Remove the rear door assembly	39
Rear lower cover assembly	40
Remove the rear lower cover assembly	40
Control panel	41
Remove the control panel	41
Front door	43
Remove the front door	43
Main assemblies	45
ITB assembly	45
Remove the ITB assembly	45
Fuser delivery assembly	54
Remove the fuser delivery assembly	55
Formatter PCA (base model)	59
Remove the formatter PCA (base model)	59
Formatter and wireless PCA (plus model)	60
Remove the formatter and wireless PCA (plus model)	60
Engine controller assembly	62
Remove the engine controller assembly	62
Low-voltage power supply assembly	65
Remove the low-voltage power supply assembly	65
Solve problems	69
Solve problems checklist	70
Step 1: Make sure that the product is set up correctly	70
Step 2: Check the cabling or wireless connection (network models only)	70
Step 3: Check to see if any control-panel lights are lit	70
Step 4: Check the paper	70
Step 5: Check the software	71
Step 6: Test print functionality	71
Step 7: Check the supplies	71
Step 8: Try sending a print job from a computer	71
Troubleshooting process	72
Determine the problem source	72
Power subsystem	73
Power-on checks	73
Tools for troubleshooting	74
Component diagnostics	74
Engine diagnostics	74
Engine test page	74
Diagrams	75
Plug/jack locations	75
Locations of connectors	76
Locations of major components	77
General timing chart	79
General circuit diagram	80
Internal print-quality test pages	81
Print quality troubleshooting page	81
Interpret the Print Quality Page	81
Clean the paper path	82
Print configuration page	82
Print-quality troubleshooting tools	83
Repetitive image defects ruler	83
Calibrate the product	83
Interpret control panel light patterns	84
Status alert messages	87
Clear jams	93
Prevent paper jams	93
Jam locations	94
Clear jams from the input tray	94
Clear jams from the output bin	96
Clear jams from the rear door	97
The product does not feed automatically	98
The product feeds multiple sheets	98
Solve image-quality problems	99
Image defects table	99
Clean the product	105
Clean the separation pad or pickup roller	105
Clean the paper path	106
Clean the exterior	106
Solve performance problems	107
The product does not print	107
The product prints slowly	107
Solve connectivity problems	108
Solve direct-connect problems	108
Solve network problems	108
Poor physical connection	108
The computer is using the incorrect IP address for the product	108
The computer is unable to communicate with the product	109
The product is using incorrect link and duplex settings for the network	109
New software programs might be causing compatibility problems	109
The computer or workstation might be set up incorrectly	109
The product is disabled, or other network settings are incorrect	109
Solve wireless network problems (wireless models only)	110
Wireless connectivity checklist	110
The product does not print after the wireless configuration completes	110
The product does not print, and the computer has a third-party firewall installed	111
The wireless connection does not work after moving the wireless router or product	111
Cannot connect more computers to the wireless product	111
The wireless product loses communication when connected to a VPN	111
The network does not appear in the wireless networks list	111
The wireless network is not functioning	111
Service mode functions	113
Product resets	113
Product updates	113
Parts and diagrams	115
Order parts by authorized service providers	116
Order replacement parts	116
Related documentation and software	116
Supplies part numbers	116
Service parts	116
Whole-unit replacement part numbers	117
How to use the parts lists and diagrams	118
Assembly locations	119
Base product (no optional trays or accessories)	119
Covers, panels, and doors	120
Internal assembly	122
Internal assembly	122
PCAs	124
Alphabetical parts list	126
Numerical parts list	128
Service and support	131
Hewlett-Packard limited warranty statement	132
HP's Premium Protection Warranty: LaserJet print cartridge limited warranty statement	134
HP's LaserJet imaging drum limited warranty statement for replacement imaging drums	135
Data stored on the print cartridge and imaging drum	136
End User License Agreement	137
OpenSSL	139
Customer self-repair warranty service	140
Customer support	140
Repack the product	141
Specifications	143
Physical specifications	144
Power consumption	144
Acoustic specifications	145
Environmental specifications	145
Regulatory information	147
FCC regulations	148
Declaration of conformity (base models)	149
Declaration of conformity (wireless models)	151
Certificate of Volatility	153
Safety statements	155
Laser safety	155
Canadian DOC regulations	155
VCCI statement (Japan)	155
Power cord instructions	155
Power cord statement (Japan)	155
EMC statement (Korea)	156
Laser statement for Finland	156
GS statement (Germany)	156
Substances Table (China)	157
Restriction on Hazardous Substances statement (Turkey)	157
Additional statements for wireless products	158
FCC compliance statement—United States	158
Australia statement	158
Brazil ANATEL statement	158
Canadian statements	158
European Union regulatory notice	158
Notice for use in France	159
Notice for use in Russia	159
Korean statement	159
Taiwan statement	159