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Solve paper-handling problems

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Solve paper-handling problems The following problems with paper cause print-quality deviations, jams, or damage to the product. Problem Cause Solution Poor print quality or toner adhesion Dropouts, jamming, or curl The paper is too moist, too rough, too heavy or too smooth, or it is embossed or from a faulty paper lot. Try another kind of paper, between 100 and 250 Sheffield, with 4% to 6% moisture content. The paper has been stored incorrectly. Store paper flat in its moisture-proof wrapping. The paper has variability from one side Turn the paper over. to the other. Excessive curl Jams, damage to product The paper is too moist, has the wrong grain direction, or is of short-grain construction. The paper varies from side-to-side. The paper has cutouts or perforations. Use long-grain paper. Turn the paper over. Use paper that is free of cutouts or perforations. Problems with feeding The paper has ragged edges. Use high-quality paper that is made for laser printers. The paper varies from side-to-side. Turn the paper over. The paper is too moist, too rough, too heavy or too smooth, has the wrong grain direction, or is of short-grain construction or it is embossed or from a faulty paper lot. Try another kind of paper, between 100 and 250 Sheffield, 4% to 6% moisture content. Use long-grain paper. Print is skewed (crooked). The paper guides might be incorrectly adjusted. Remove all paper from the input tray, straighten the stack, and then load the paper in the input tray again. Adjust the paper guides to the width and length of the paper that you are using and try printing again. More than one sheet feeds at one time. The paper tray might be overloaded. Remove some of the paper from the tray. The paper might be wrinkled, folded, or damaged. Verify that the paper is not wrinkled, folded, or damaged. Try printing on paper from a new or different package. The product does not pull paper from the The product might be in manual-feed input tray. mode. At the computer, follow the onscreen instructions to deactivate manual-feed mode. Or, at the product, open and close the print-cartridge door. The pickup roller might be dirty or damaged. Clean the roller if it is dirty. Replace the roller if it is damaged. See Pickup roller on page 37. The paper-length adjustment control in the input tray is set at a length that is greater than the paper size. Set the paper-length adjustment control to the correct length. 116 Chapter 3 Solve problems ENWW

Section	Page
Theory of operation	19
Basic operation	20
Major product systems	20
Product block diagram	20
Sequence of operation	21
Normal sequence of operation	21
Formatter-control system	22
Sleep mode	22
Input/output	22
CPU	22
Memory	22
Firmware	23
Memory use	23
PJL overview	23
LEDM overview	23
ACL overview	23
Control panel	24
Wireless PCA	24
Engine-control system	25
Motors, fans, clutches, solenoids, switches, and sensors	26
DC controller operations	29
Fuser-control circuit	30
Fuser failure detection	31
Fuser temperature control	32
Fuser protective function	33
Pressure roller cleaning	33
Low-voltage power supply	34
Overcurrent/overvoltage protection	35
High-voltage power supply	36
Laser/scanner system	37
Laser failure detection	38
Image-formation system	39
Electrophotographic process	39
Image formation process	41
Latent-image formation stage	42
Primary charging	42
Laser beam exposure	42
Developing stage	43
Print cartridge	43
Transfer stage	44
Fusing stage	45
Cleaning stage	45
Pickup, feed, and delivery system	46
Photo sensors and switches	47
Input tray, main-input tray, or priority input slot	48
Jam detection	48
Removal and replacement	49
Introduction	50
Removal and replacement strategy	50
Electrostatic discharge	51
Required tools	51
Before performing service	52
After performing service	52
Post-service test	53
Print-quality test	53
Parts removal order	54
Pickup roller	55
Separation pad	56
Transfer roller	57
Covers	58
Input tray or main-input tray	58
Output bin tray extension	59
Front cover	60
Remove the front cover	60
Left cover	61
Remove the left cover	61
Right cover	64
Remove the right cover	64
Cartridge door	66
Remove the cartridge door	66
Face-down cover	68
Remove the face-down cover	68
Rear cover	70
Remove the rear cover	70
Main assemblies	72
Formatter PCA	72
Remove the formatter PCA	73
Wireless PCA	75
Remove the wireless PCA	75
Laser/scanner assembly	76
Remove the laser/scanner assembly	76
Reinstall the laser/scanner assembly	78
Pickup assembly	79
Remove the pickup assembly	79
Reinstall the pickup assembly	83
Fuser	85
Remove the fuser	85
Reinstall the fuser	89
Main motor	90
Remove the main motor	90
Reinstall the main-motor drive belt	94
Pickup solenoid	95
Remove the pickup solenoid	95
Engine controller PCA	98
Remove the engine controller PCA	98
Reinstall the engine controller PCA	102
Solve problems	105
Solve problems checklist	106
Troubleshooting process	109
Determine the problem source	109
Power subsystem	110
Power-on checks	110
Tools for troubleshooting	111
Individual component diagnostics	111
Engine diagnostics	111
Engine-test button	111
Components tests	112
Drum rotation functional check	112
Half self-test functional check	112
Diagrams	113
Plug/jack locations	113
Location of connectors	114
Locations of major components	115
General timing charts	117
General circuit diagram	118
Internal print-quality test pages	120
Cleaning page	120
Configuration page	120
Print-quality troubleshooting tools	121
Repetitive defect ruler	121
Interpret control-panel light patterns	121
Clear jams	125
Common causes of jams	125
Jam locations	126
Clear jams from the input tray	127
Clear jams from the output areas	129
Clear jams from inside the product	131
Solve repeated jams	132
Change jam recovery	132
Solve paper-handling problems	134
Solve image-quality problems	135
Image defect table	135
Light print or faded	135
Toner specks	135
Dropouts	136
Vertical lines	136
Gray background	136
Toner smear	136
Loose toner	137
Vertical repetitive defects	137
Misformed characters	137
Page skew	137
Curl or wave	138
Wrinkles or creases	138
Toner scatter outline	138
Moisture	139
Optimize and improve image quality	140
Change print density	140
Clean the product	141
Clean the pickup roller	141
Clean the paper path	142
Clean the print-cartridge area	144
Clean the exterior	146
Solve performance problems	147
Solve connectivity problems	148
Solve direct-connect problems	148
Solve wireless problems	148
Service mode functions	150
Product resets	150
Product updates	151
Parts and diagrams	153
Order parts by authorized service providers	154
Order parts, accessories, and supplies	154
Related documentation and software	154
Supplies part numbers	154
Customer self repair parts	155
Service parts	155
Whole-unit replacement part numbers	155
How to use the parts lists and diagrams	156
Assembly locations	157
Base product	157
Covers	158
Base model	158
Wireless model	160
Internal assemblies	162
Internal assemblies (1 of 3)	162
Internal assemblies (2 of 3)	164
Internal assemblies (3 of 3)	166
PCAs	168
Alphabetical parts list	170
Numerical parts list	173
Service and support	177
Hewlett-Packard limited warranty statement	178
HP's Premium Protection Warranty: LaserJet print cartridge limited warranty statement	179
End User License Agreement	180
Customer self-repair warranty service	182
Customer support	182
Repack the product	183
Service information form	184
Specifications	185
Physical specifications	186
Power consumption	186
Acoustic specifications	186
Environmental specifications	187
Regulatory information	189
FCC regulations	190
Declaration of conformity (base models)	191
Declaration of conformity (wireless models)	192
Certificate of Volatility	193
Safety statements	195
Laser safety	195
Canadian DOC regulations	195
VCCI statement (Japan)	195
Power cord instructions	195
Power cord statement (Japan)	195
EMC statement (Korea)	195
Laser statement for Finland	196
GS statement (Germany)	196
Substances Table (China)	197
Additional statements for wireless products	198
FCC compliance statement—United States	198
Australia statement	198
Brazil ANATEL statement	198
Canadian statements	198
European Union regulatory notice	198
Notice for use in France	199
Notice for use in Russia	199
Korean statement	199
Taiwan statement	199

Match case Limit results 1 per page

Solve paper-handling problems

The following problems with paper cause print-quality deviations, jams, or damage to the product.

Problem

Cause

Solution

Poor print quality or toner adhesion

The paper is too moist, too rough, too

heavy or too smooth, or it is embossed

or from a faulty paper lot.

Try another kind of paper, between 100

and 250 Sheffield, with 4% to 6%

moisture content.

Dropouts, jamming, or curl

The paper has been stored incorrectly.

Store paper flat in its moisture-proof

wrapping.

The paper has variability from one side

to the other.

Turn the paper over.

Excessive curl

The paper is too moist, has the wrong

grain direction, or is of short-grain

construction.

Use long-grain paper.

The paper varies from side-to-side.

Turn the paper over.

Jams, damage to product

The paper has cutouts or perforations.

Use paper that is free of cutouts or

perforations.

Problems with feeding

The paper has ragged edges.

Use high-quality paper that is made for

laser printers.

The paper varies from side-to-side.

Turn the paper over.

The paper is too moist, too rough, too

heavy or too smooth, has the wrong grain

direction, or is of short-grain construction

or it is embossed or from a faulty paper

lot.

Try another kind of paper, between 100

and 250 Sheffield, 4% to 6% moisture

content.

Use long-grain paper.

Print is skewed (crooked).

The paper guides might be incorrectly

adjusted.

Remove all paper from the input tray,

straighten the stack, and then load the

paper in the input tray again. Adjust the

paper guides to the width and length of

the paper that you are using and try

printing again.

More than one sheet feeds at one time.

The paper tray might be overloaded.

Remove some of the paper from the tray.

The paper might be wrinkled, folded, or

damaged.

Verify that the paper is not wrinkled,

folded, or damaged. Try printing on

paper from a new or different package.

The product does not pull paper from the

input tray.

The product might be in manual-feed

mode.

At the computer, follow the onscreen

instructions to deactivate manual-feed

mode. Or, at the product, open and close

the print-cartridge door.

The pickup roller might be dirty or

damaged.

Clean the roller if it is dirty. Replace the

roller if it is damaged. See

Pickup roller

on page

The paper-length adjustment control in

the input tray is set at a length that is

greater than the paper size.

Set the paper-length adjustment control

to the correct length.

116

Chapter 3

Solve problems

ENWW