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HP 4600dn Service Manual - Page 259

White vertical lines, Horizontal lines, Missing color, Table 7-28

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White vertical lines Table 7-27 Causes for white vertical lines Cause Developing cylinder has grooves going around the circumference. Photosensitive drum has grooves going around the circumference. Laser is blocked by a foreign substance. Mirror in the laser/scanner unit is dirty. The fuser sleeve has vertical scars. (All colors are affected.) Solution Replace the print cartridge for the color in which the white lines appear. Replace the print cartridge for the color in which the white lines appear. Inspect the laser source for the affected color, and remove any debris that might be blocking it. Replace the laser/scanner for the color in which the white lines appear. Calibrate the printer after replacing the laser/scanner. See "Calibrate Now" on page 294. Replace the fuser. Horizontal lines Table 7-28 Causes for horizontal lines Cause Solution Photosensitive drum has scars running from end to Replace the print cartridge for the affected color. end. The fuser sleeve has scars running from end to end. Replace the fuser. White horizontal lines Table 7-29 Causes for white horizontal lines Cause Solution Photosensitive drum has scars running from end to Replace the print cartridge for the affected color. end. ETB belt has horizontal scars. Replace the ETB. Calibrate the printer after replacing the ETB. See "Calibrate Now" on page 294. Missing color Table 7-30 Causes for a missing color Cause Poor contact in the developing bias contacts of the high-voltage PCB and the print cartridge. Primary charging roller is defective. Laser/scanner unit is defective. High-voltage PCB is defective. DC controller PCB is defective. Solution Clean the contacts. If they are still dirty after cleaning, or if they are damaged, replace the print cartridge or the high-voltage contacts. Replace the high-voltage PCB. Replace the print cartridge for the missing color. Replace the laser/scanner for the missing color. Calibrate the printer after replacing the laser/scanner. See "Calibrate Now" on page 294. Replace the high-voltage PCB. Replace the DC controller PCB. Calibrate the printer after replacing the DC controller. See "Calibrate Now" on page 294. C9660-90901 Chapter 7 Troubleshooting 257

Section	Page
Contents	7
List of figures	13
List of tables	17
Printer description	19
Printer features	20
Identification	23
Model and serial numbers	23
Power and regulatory information	24
Site requirements	25
Space requirements	25
Electrical specifications	26
Environmental specifications	26
Supply storage requirements	27
Printer specifications	27
Printer assemblies	28
Media requirements	30
Selecting print media	30
Media specifications	30
Supported media weights and sizes	31
Media to avoid	33
Media that may cause damage to the printer	33
Printing on special media	33
Weight equivalence table	37
Environmental Product Stewardship Program	38
Protecting the environment	38
Regulatory statements	40
FCC Regulations	40
Safety information	41
Laser safety statement	41
Material Safety Data Sheet	41
Toner safety	41
Canadian DOC regulations	41
EMI statement (Korea)	41
VCCI statement (Japan)	42
Laser statement for Finland	43
Declaration of Conformity	44
Service approach	45
Service approach	46
Parts and supplies	47
Ordering parts	47
Ordering supplies	47
Exchange program	48
Supplies	48
World Wide Web	48
HP Service Parts Information Compact Disc	48
HP Support Assistant Compact Disc	48
Customer care reseller sales and service support center	48
Ordering related documentation and software	49
Warranty statement	50
Hewlett-Packard warranty statement	50
Limited warranty for print cartridge life	51
Transfer unit and fuser warranty	51
HP maintenance agreements	52
On-site service agreements	52
Installation and configuration	53
Unpack the printer	54
Unpacking the printer	55
Installation	58
Installing the media tray	58
Connecting power	59
Installing the print cartridges	59
Installing a new overlay (optional)	61
Testing the printer operation	61
Using PowerSave	62
Connecting to a computer	63
Parallel connections	63
Network connections	64
Enhanced I/O (EIO) configuration	66
HP Jetdirect print servers	66
Available enhanced I/O interfaces	66
NetWare networks	66
Windows and Windows NT networks	67
AppleTalk networks	67
LocalTalk configuration	67
LocalTalk network configuration	67
UNIX/Linux networks	67
Printer drivers	68
Available drivers	68
Additional drivers	69
Network configuration	70
Configuring the printer for the network	70
Configuring Novell NetWare frame type parameters	70
Setting network security on the printer	71
Locking the control panel	71
Using an ASCII PJL escape sequence to set network security	72
Printer maintenance	73
Cleaning the printer and accessories	74
Cleaning spilled toner	74
Approximate replacement intervals for supply items	75
ETB life under different circumstances	76
Locating supplies	77
Replacing supply items	78
Changing print cartridges	78
Replacing the transfer unit	81
Replacing the fuser	84
Printer memory	86
Installing memory and font DIMMs	87
Installing an HP Jetdirect print server card	90
Theory of operation	91
Basic operation	92
Operation sequence	93
Engine control system	94
DC controller circuit	95
Motors and fans	96
Fuser power supply circuit	98
Heater temperature control	99
High-voltage power supply	100
Low-voltage power supply	101
Formatter system	102
PowerSave	103
Input/Output	103
Printer memory	104
DIMM slots	104
PJL overview	104
PML	105
Control panel	105
Laser/scanner system	106
Scanner motor control	107
Image formation system	108
Image formation process	109
Print cartridges	110
Toner level detection	112
Electrostatic transfer/transport belt (ETB) unit	114
Electrostatic latent image formation block	115
Development block	117
Transfer block	118
Fusing block	120
Cleaning block	120
Calibration and cleaning	121
Color plane registration calibration	124
Drum phase calibration	124
Image stabilization control	125
Pickup/feed system	127
Pickup/feed unit	130
Fuser/delivery unit	134
Duplex feed unit	135
500-sheet paper feeder	136
Pickup and feed operations	137
Removal and replacement	139
Introduction	141
Removal and replacement strategy	141
Repair notices	141
Caution regarding electrostatic discharge (ESD)	141
Required tools	142
Types of screws	143
Supplies	144
Print cartridges and ETB	145
Covers and external components	146
Rear cover	146
Top cover	147
Rear top cover	148
Left cover	150
Right cover	152
Multi-purpose tray (Tray 1)	153
Front cover	154
Control panel	155
Internal components	157
DC controller shield	157
Internal components (front)	158
Paper pickup unit	158
Paper pickup sensor PCB	159
Cassette (Tray 2) paper pickup rollers	160
Paper pickup drive unit	161
Multi-purpose tray pickup roller and separation pad	162
Solenoids	163
Color registration detection unit	164
Internal components (left side)	166
Drum drive units	166
Memory tag antenna PCBs	172
Developing disengaging motor assembly	173
DC controller PCB	174
Memory controller PCB	175
Cassette paper size detection switch	176
Internal components (rear)	177
Formatter	177
Low-voltage power supply	178
Formatter case	180
Laser/scanner units	182
Internal components (right side)	187
High-voltage power supply PCB	187
Toner level detection PCB	189
High-voltage contact blocks	190
Door switch	191
Internal components (top)	192
Fuser power supply PCB	192
Fuser drive unit	194
Fuser inlet paper sensor	196
Fuser delivery sensor	197
Output bin full sensor	198
Cartridge fan	199
Formatter fan	200
Optional 500-sheet paper feeder	201
Paper feeder top cover plate	201
Paper feeder drive unit	202
Paper feeder pickup rollers	203
Paper feeder PCB	204
Troubleshooting	205
Introduction	207
Troubleshooting process	208
Pre-troubleshooting checklist	209
Troubleshooting flowchart	210
Troubleshooting power-on	212
Printer error troubleshooting	213
Status messages	213
Warning messages	213
Error messages	213
Critical error messages	213
Alphabetical printer messages	214
Numerical printer messages	225
Paper path troubleshooting	236
Jams	236
Jam locations	236
Jam locations by error message	237
Paper jam recovery	238
Avoiding paper jams	239
Persistent jams	240
Paper transport troubleshooting	246
Multiple pages are fed	246
Paper is wrinkled or folded	246
Paper is skewed	247
Image formation troubleshooting	248
Print quality problems associated with media	248
Overhead transparency defects	249
Print quality problems associated with the environment	249
Print quality problems associated with jams	249
Print quality troubleshooting pages	249
Understanding color variations	250
Color selection process	250
Matching colors	251
Using color	251
Color options	252
Adjusting color balance	254
Image defects	255
Repetitive defects troubleshooting	262
Interface troubleshooting	265
Communications checks	265
EIO troubleshooting	265
AUTOEXEC.BAT standard configurations	266
Printer Job Language (PJL) commands	266
Control panel troubleshooting	269
Printing a menu map	269
Information menu	270
Paper handling menu	270
Configure device menu	271
Diagnostics menu	275
Service menu	276
Tools for troubleshooting	277
Embedded Web server	277
To access the embedded Web server	277
Printer Status and Alerts software	280
Printer configuration page	281
Supplies status page	282
Usage page	283
Event log	284
Diagnostics	285
Diagnostics flowchart	285
Engine diagnostics	287
Individual diagnostic tests	289
Test pages	294
Engine test page	294
Formatter test page	294
Engine resets	295
Cold reset	295
NVRAM initialization	295
Hard disk initialization	296
Calibration bypass	296
Calibrate Now	296
Service menu	297
Accessing the Service menu	297
Diagrams	299
Main parts	299
Switches	300
Sensors	301
Solenoids	303
Motors and fans	304
PCBs	305
DC controller PCB	306
Connectors	307
500-sheet paper feeder connectors	308
General circuit diagram	309
500-sheet paper feeder circuit diagram	310
Parts and diagrams	311
Introduction	312
Ordering parts	313
Supplies and accessories	313
Common fasteners	316
Illustrations and parts lists	317
Alphabetical parts list	344
Numerical parts list	350

Match case Limit results 1 per page

C9660-90901

Chapter 7 Troubleshooting

257

White vertical lines

Horizontal lines

White horizontal lines

Missing color

Table 7-27

Causes for white vertical lines

Cause

Solution

Developing cylinder has grooves going around the

circumference.

Replace the print cartridge for the color in which the

white lines appear.

Photosensitive drum has grooves going around the

circumference.

Replace the print cartridge for the color in which the

white lines appear.

Laser is blocked by a foreign substance.

Inspect the laser source for the affected color, and

remove any debris that might be blocking it.

Mirror in the laser/scanner unit is dirty.

Replace the laser/scanner for the color in which the

white lines appear. Calibrate the printer after

replacing the laser/scanner. See “Calibrate Now” on

page 294.

The fuser sleeve has vertical scars. (All colors are

affected.)

Replace the fuser.

Table 7-28

Causes for horizontal lines

Cause

Solution

Photosensitive drum has scars running from end to

end.

Replace the print cartridge for the affected color.

The fuser sleeve has scars running from end to end.

Replace the fuser.

Table 7-29

Causes for white horizontal lines

Cause

Solution

Photosensitive drum has scars running from end to

end.

Replace the print cartridge for the affected color.

ETB belt has horizontal scars.

Replace the ETB. Calibrate the printer after

replacing the ETB. See “Calibrate Now” on

page 294.

Table 7-30

Causes for a missing color

Cause

Solution

Poor contact in the developing bias contacts of the

high-voltage PCB and the print cartridge.

Clean the contacts. If they are still dirty after

cleaning, or if they are damaged, replace the print

cartridge or the high-voltage contacts. Replace the

high-voltage PCB.

Primary charging roller is defective.

Replace the print cartridge for the missing color.

Laser/scanner unit is defective.

Replace the laser/scanner for the missing color.

Calibrate the printer after replacing the

laser/scanner. See “Calibrate Now” on page 294.

High-voltage PCB is defective.

Replace the high-voltage PCB.

DC controller PCB is defective.

Replace the DC controller PCB. Calibrate the

printer after replacing the DC controller. See

“Calibrate Now” on page 294.