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HP LaserJet Pro CP1525 Service Manual - Page 95

Print-quality troubleshooting tools, Repetitive image defects

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Print-quality troubleshooting tools Repetitive image defects If the product output has a consistent, repetitive defect, use the table in this section to determine which part needs to be replaced based on the measured distance between the repetitions of the defect. Repetitive defects for the ITB normally appear on every other page, because the ITB is longer than a page. However, the period of the repetitive defect can vary depending on the type of media, and a repetitive defect can occur more than once on the same page. NOTE: The following table replaces the graphical repetitive defect ruler. You can make your own ruler by using these measurements. Table 2-2 Repetitive image defects Distance between identical defects Component Notes 22.3 mm (0.87 in) Developer roller (one rotation) Appears in a single color plane 26.7 mm (1.05 in) 28.5 mm (1.12 in) Charger roller Developer RS roller (one rotation) Appears in a single color plane. Inside developer, it and removes and supplies toner to the developer sleeve. 44.0 mm (1.73 in) Registration roller 56.5 mm (2.22 in) Fuser film (one rotation) Appears in all color planes. 56.8 mm (2.23 in) Fuser pressure roller (one rotation) Appears in all color planes. 57.0 mm (2.24 in) Transfer roller Appears in all color planes. 69.0 mm (2.71 in) Cartridge-to-cartridge spacing Distance between each color OPC. 75.8 mm (2.98 in) 633.6 mm (24.94 in) OPC drum (one rotation) ITB Appears in a single color plane and might be either a dark or white spot. Because the ITB is longer than a page, you might have to look at multiple pages to determine if a repetitive defect is present. 69.0 mm (2.71 in) ITB drive roller pitch Calibrate the product to align the colors If the printed output has colored shadows, blurry graphics, or areas that have poor color, you might need to calibrate the product to align the colors. Print the Diagnostics Page from the Reports menu on the control panel to check the color alignment. If the blocks of color on that page are not aligned with each other, you need to calibrate the product. 1. On the product control panel, open the System Setup menu. 2. Open the Print quality menu, and select the Calibrate color item. 3. Select the Calibrate now option. ENWW Tools for troubleshooting 77

Section	Page
Removal and replacement	19
Introduction	20
Removal and replacement strategy	20
Electrostatic discharge	21
Required tools	21
Service approach	21
Before performing service	21
After performing service	22
Post-service test	22
Print-quality test	22
Parts removal order	22
Removal and replacement procedures	23
Remove the print cartridges	23
Rollers	24
Pickup roller	24
Separation roller	25
Transfer roller	26
Feed assembly	27
External panels, covers, and doors	28
Right cover	28
Left cover	31
Front door and Tray 1 door	33
Control-panel module	37
Rear-side cover	39
Rear-upper cover	40
Rear door and rear-lower cover	41
Top cover	43
Internal assemblies	45
Main motor	45
Fuser motor	47
Intermediate transfer belt (ITB)	48
Reinstall the ITB	53
DC controller PCA	55
Special consideration	55
Remove the DC controller PCA	55
Formatter PCA	58
Special consideration	58
Remove the formatter PCA	58
Wireless PCA	60
Power supply (high-voltage)	61
Power supply (low-voltage)	65
Power supply (fuser)	71
Fuser	74
Solve problems	77
Solve problems checklist	78
Menu map	79
Troubleshooting process	80
Pre-troubleshooting checklist	80
Power-on checks	82
Tools for troubleshooting	83
Diagrams	83
Plug/jack locations	83
Locations of major components	84
General timing charts	86
General circuit diagram	87
Use HP ToolboxFX	88
View the HP Color LaserJet CP1520 Series Toolbox	88
HP ToolboxFX sections	89
Status	89
Event log	89
Help	89
System Settings	89
Device Information	90
Paper Setup	91
Print Quality	91
Print Density	91
Paper Types	92
System Setup	92
Print Settings	92
Printing	92
PCL5c	92
PostScript	92
Network Settings	92
Shop for Supplies	92
Other Links	93
Internal print-quality test pages	93
Interpret the Print Quality Page	93
Clean the product	94
Configuration page	94
Print-quality troubleshooting tools	95
Repetitive image defects	95
Calibrate the product to align the colors	95
Control panel menus	96
Reports menu	96
Quick Forms menu	97
System Setup menu	97
Service menu	100
Network Setup menu	101
Interpret control panel messages	102
Control panel message types	102
Control panel messages	102
Paper feeds incorrectly or becomes jammed	113
The product does not pick up paper	113
The product picks up multiple sheets of paper	113
Prevent paper jams	113
Clear jams	114
Jam locations	114
Jam in Tray 1	115
Jam in Tray 2	117
Jam in the fuser area	118
Jam in the output bin	119
Solve image quality problems	120
Use the correct paper type setting in the printer driver	120
Change the paper type setting for Windows	120
Change the paper type setting for Mac	120
Adjust color settings in the printer driver	121
Change the color theme for a print job	121
Change the color options	121
Use paper that meets HP specifications	122
Print a cleaning page	123
Calibrate the product to align the colors	123
Check the print cartridges	123
Print the Supplies Status page	124
Inspect the print cartridge for damage	124
Repeating defects	125
Use the printer driver that best meets your printing needs	125
Clean the product	127
The product does not print or it prints slowly	128
The product does not print	128
The product prints slowly	128
Solve connectivity problems	129
Solve direct-connect problems	129
Solve network problems	129
Poor physical connection	129
The computer is using the incorrect IP address for the product	129
The computer is unable to communicate with the product	130
The product is using incorrect link and duplex settings for the network	130
New software programs might be causing compatibility problems	130
The computer or workstation might be set up incorrectly	130
The product is disabled, or other network settings are incorrect	130
Service mode functions	131
Service menu	131
Service menu settings	131
Restore the factory-set defaults	131
Secondary service menu	131
Open the secondary service menu	131
Secondary service menu structure	132
Engine resets	132
Engine test page	132
Cold reset	133
NVRAM initialization	133
Product updates	133
Parts and diagrams	135
Order parts by authorized service providers	136
Order replacement parts	136
Related documentation and software	136
Supplies part numbers	136
Whole-unit replacement part numbers	136
How to use the parts lists and diagrams	138
Assembly locations	139
Base product (no optional trays or accessories)	139
Covers, panels, and doors	140
Internal assemblies	142
Alphabetical parts list	152
Numerical parts list	155
Service and support	159
Hewlett-Packard limited warranty statement	160
HP's Premium Protection Warranty: LaserJet print cartridge limited warranty statement	161
Data stored on the print cartridge	162
End User License Agreement	163
OpenSSL	165
Customer support	166
Repack the product	167
Product specifications	169
Physical specifications	170
Power consumption, electrical specifications, and acoustic emissions	170
Environmental specifications	170
Regulatory information	171
FCC regulations	172
Environmental product stewardship program	173
Protecting the environment	173
Ozone production	173
Power consumption	173
Paper use	173
Plastics	173
HP LaserJet print supplies	173
Return and recycling instructions	174
United States and Puerto Rico	174
Multiple returns (more than one cartridge)	174
Single returns	174
Shipping	174
Residents of Alaska and Hawaii	174
Non-U.S. returns	174
Paper	175
Material restrictions	175
Disposal of waste equipment by users in private households in the European Union	175
Chemical substances	175
Material Safety Data Sheet (MSDS)	175
For more information	176
Declaration of conformity	177
Declaration of Conformity (wireless models)	179
Safety statements	181
Laser safety	181
Canadian DOC regulations	181
VCCI statement (Japan)	181
Power cord instructions	181
Power cord statement (Japan)	181
EMC statement (Korea)	181
Laser statement for Finland	182
GS statement (Germany)	182
Substances Table (China)	183
Restriction on Hazardous Substances statement (Turkey)	183
Additional statements for wireless products	184
FCC compliance statement—United States	184
Australia statement	184
Brazil ANATEL statement	184
Canadian statements	184
European Union regulatory notice	184
Notice for use in France	185
Notice for use in Russia	185
Korean statement	185
Taiwan statement	185

Match case Limit results 1 per page

Print-quality troubleshooting tools

Repetitive image defects

If the product output has a consistent, repetitive defect, use the table in this section to determine

which part needs to be replaced based on the measured distance between the repetitions of the

defect.

Repetitive defects for the ITB normally appear on every other page, because the ITB is longer than a

page. However, the period of the repetitive defect can vary depending on the type of media, and a

repetitive defect can occur more than once on the same page.

NOTE:

The following table replaces the graphical repetitive defect ruler. You can make your own

ruler by using these measurements.

Table 2-2

Repetitive image defects

Distance between identical defects

Component

Notes

22.3 mm (0.87 in)

Developer roller (one rotation)

Appears in a single color plane

26.7 mm (1.05 in)

Charger roller

Appears in a single color plane.

28.5 mm (1.12 in)

Developer RS roller (one rotation)

Inside developer, it and removes

and supplies toner to the developer

sleeve.

44.0 mm (1.73 in)

Registration roller

56.5 mm (2.22 in)

Fuser film (one rotation)

Appears in all color planes.

56.8 mm (2.23 in)

Fuser pressure roller (one rotation)

Appears in all color planes.

57.0 mm (2.24 in)

Transfer roller

Appears in all color planes.

69.0 mm (2.71 in)

Cartridge-to-cartridge spacing

Distance between each color OPC.

75.8 mm (2.98 in)

OPC drum (one rotation)

Appears in a single color plane and

might be either a dark or white spot.

633.6 mm (24.94 in)

ITB

Because the ITB is longer than a

page, you might have to look at

multiple pages to determine if a

repetitive defect is present.

69.0 mm (2.71 in)

ITB drive roller pitch

Calibrate the product to align the colors

If the printed output has colored shadows, blurry graphics, or areas that have poor color, you might

need to calibrate the product to align the colors. Print the Diagnostics Page from the Reports menu

on the control panel to check the color alignment. If the blocks of color on that page are not aligned

with each other, you need to calibrate the product.

On the product control panel, open the

System Setup

menu.

Open the Print quality menu, and select the

Calibrate color

item.

Select the

Calibrate now

option.

ENWW

Tools for troubleshooting