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HP 8000dn Service Manual - Page 135

Drum Conditioning, Primary Charging Roller

UPC - 088698569634

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Drum Conditioning After the drum is physically cleaned, it is conditioned by applying a uniform negative charge across the surface of the drum with the primary charging roller, located in the toner cartridge. The primary charging roller is coated with conductive rubber, charged with an AC current that erases any residual charges, and produces a uniform drum surface potential. The AC current is centered around a negative DC bias which changes according to the Print Density setting. Figure 5-9 Primary Charging Roller EN Image Formation System 111

Section	Page
C85017_6.pdf	69
Operating Environment	70
Space Requirements	71
Environmental Requirements	73
C85017_7.pdf	75
Using the Control Panel	76
Control Panel Layout	76
Indicator Lights	77
Settings and Defaults	78
Printer Driver Information	78
Paper Source Default	78
Resetting the Printer	79
Setting the Display Language	79
Control Panel Menus	82
Information Menu	83
Paper Handling Menu	84
Print Quality Menu	86
Printing Menu	88
Configuration Menu	91
I/O Menu	94
EIO Menu	96
Resets Menu	98
Service Mode	99
Setting Page Count, Maintenance Count, and Serial ...	102
Setting the Cold Reset Default Paper Size	103
Testing the Printer	104
Paper Path Test	104
Configuration Page	104
Cold Reset	109
C85017_8.pdf	111
Cleaning the Printer and Accessories	112
Cleaning Spilled Toner	114
Preventative Maintenance	115
Tray Adjustment Procedure	116
Tray 4 (2000-sheet Input Tray) Adjustment Procedur...	118
C85017_9.pdf	121
Printer Functional Block Diagram	122
Power Distribution System	123
AC Power Distribution	124
Overcurrent/Overvoltage Protection	124
High Voltage Power Distribution	125
Formatter System	126
DC Controller System	129
Laser and Scanner Drive	129
Paper Motion Monitoring and Control	129
Clutches	129
Engine Test Microswitch	130
Motors	130
Image Formation System	131
Toner Cartridge	132
Drum Cleaning	134
Drum Conditioning	135
Image Writing	136
Image Developing	137
Image Transferring and Media Separation	139
Image Fusing	140
Paper Paths and Components	141
Printer, Duplexer, and Envelope Feeder	141
2000-sheet Input Tray (Tray 4) Components	145
Multibin Mailbox Components	145
2 x 500-sheet Input Tray Components	146
7-bin Tabletop Mailbox Components	148
7-bin Tabletop Mailbox Operation	150
Operating Modes	150
Communication Link	152
Stapler Components	155
5-bin Mailbox with Stapler Operation	157
Main Functional Cycles of the Stapler	158
Printer Input Sources	160
Paper Size Switches	160
Printing from Trays 2 and 3	160
Printing from Tray 1	161
Printing from the Envelope Feeder	161
Printing from the 2000-sheet Input Tray (Tray 4) o...	161
Two-Sided Printing	161
Paper Jam Detection	162
Printer Timing	162
IEEE 1284 Parallel Cable Information	166
C8501710.pdf	167
Removal and Replacement Strategy	169
Required Tools	170
User Installable Accessories	171
Disk Drive	172
Hardware Table	181
Control Panel	183
Covers	184
AC Access Cover	184
Back Cover	186
Front Cover	187
Left Lower Cover	189
Top Cover	190
Delivery Unit (for Standard Output Bin)	193
Diverter Assembly	196
Door Assembly, Diverter	197
Door Assembly, Right Lower	198
Fan 1, Exhaust (Laser/Scanner) and Housing	201
Fan Housing	201
Fan Motor	202
Fan 2, Exhaust (LVPS)	203
Fan 3, Intake (Formatter) and Housing	204
Fan Motor	204
Fan Housing (See Fan 2)	205
Fan 4, Exhaust (Delivery Unit)	206
Feeder Assembly	207
Formatter Assembly	209
Fusing Assembly	211
Laser/Scanner Assembly	213
Main Gear Assembly	215
Main Motor Assembly	218
Paper Input Unit (PIU)	219
PCA, DC Controller	221
PCA, Output Paper Sensor	222
PCA, Paper Size	226
Power Supply, High Voltage (HVPS)	229
Power Supply, Low Voltage (LVPS)	230
Registration Assembly	231
c8501711.pdf	234
Feed Roller	234
Separation Pad	235
Rollers: Tray Pickup, Feed, and Separation	236
Sensor, Paper Input Unit (PS2)	238
Sensor, Registration (PS1)	240
Solenoid Assembly, SL3 (Face-Up)	242
Transfer Roller Assembly	243
Tray 1 Assembly	245
Tray 2 and 3 Assemblies	246
Mailbox With Stapler	247
Covers	247
Delivery Head Assembly	248
Flipper Assembly	251
Input Paper Guide	254
Interlock Switch	255
Jam Access Door Assembly	256
Lower Elevator Pulley Assemblies	259
Metallic Tape and Housing Assembly	261
Motor, Delivery Head Position	264
Motor, Transport Belt and Encoder Assembly	265
Paper Bins and Blind Cover	268
PCA, Controller	269
Strings, Anti-Curl	270
Stapler Assembly	273
Back Plate	274
Stapler Controller PCA	276
Top Cover Assembly	279
Stapler Bed Assembly	280
Hinges	282
C8501712.pdf	283
7-bin Tabletop Mailbox Front Cover	284
7-bin Tabletop Mailbox Back Cover	287
7-bin Tabletop Mailbox Top Cover	289
7-bin Tabletop Mailbox Controller PCA	293
7-bin Tabletop Mailbox Power Supply	294
7-bin Tabletop Mailbox Right Door Assembly (Paper ...	295
7-bin Tabletop Mailbox Face Down Bins	299
7-bin Tabletop Mailbox Empty Bin Sensor PCA	302
7-bin Tabletop Mailbox Full Bin and Interlock Sens...	304
7-bin Tabletop Mailbox LED PCA	306
7-bin Tabletop Mailbox Face Up Sensors PCA	307
7-bin Tabletop Mailbox Reversing Mechanism Motor	308
7-bin Tabletop Mailbox Face Up/Diverter Assembly (...	310
7-bin Tabletop Mailbox Short Tray 7	313
7-bin Tabletop Mailbox Solenoid Reversing Mechanis...	314
7-bin Tabletop Mailbox Solenoid Flipper	315
7-bin Tabletop Mailbox Handle	316
7-bin Tabletop Mailbox Latching Mechanism	317
7-bin Tabletop Mailbox Cover Latch	318
2 x 500-sheet Input Tray	319
2 x 500-sheet Input Tray Back Cover	320
2 x 500-sheet Input Tray Left Cover	321
2 x 500-sheet Input Tray Vertical Transfer Unit (V...	322
2 x 500-sheet Input Tray Right Cover	325
2 x 500-sheet Input Tray Front Top Cover	328
2 x 500-sheet Input Tray (Trays 4 and 5)	331
2 x 500-sheet Input Tray Pickup Assembly	333
2 x 500-sheet Input Tray Paper Deck Drive Assembly...	335
2 x 500-sheet Input Tray Pickup, Feed, and Separat...	337
2 x 500-sheet Input Tray Controller PCA	338
2 x 500-sheet Input Tray Cassette-Size Sensing PCA...	339
2 x 500-sheet Input Tray Power Supply	341
2 x 500-sheet Input Tray Main Cable	342
2 x 500-sheet Input Tray Storage Paper Tray	344
2 x 500-sheet Input Tray Front Door (Storage Area)...	345
2 x 500-sheet Input Tray Outriggers (Leveling Feet...	346
2 x 500-sheet Input Tray Casters	347
2 x 500-sheet Input Tray Foot Tip and Adjustable F...	348
2 x 500-sheet Input Tray Locating Pins	349
2 x 500-sheet Input Tray Front LED PCA	350
c8501713.pdf	351
Troubleshooting Process	352
Power On	356
Overview	356
Engine Test	359
Display	360
Event Log	360
Information Pages	364
Menu Map	364
Configuration Page	366
Communication	370
Interface Troubleshooting	370
Verify Host System Operation	374
Verify Network and Server Operation	374
Printer Messages	375
Control Panel Messages and Errors	375
Event Log Table	376
Image Quality	418
Check the Toner Cartridge	419
Image Quality Tables	420
Repetitive Defect Ruler	432
Image System Troubleshooting	433
High-Voltage Power Supply Check	434
Troubleshooting Checks	436
Paper Jams	436
General Paper Path Troubleshooting	438
Paper Path Test	439
Diagnostics on Accessories	442
2 x 500-sheet Input Tray Standalone Diagnostics	442
7-Bin Tabletop Mailbox Standalone Diagnostics	446
General Troubleshooting Information	450
Miscellaneous Problems and Solutions	450
Paper Curl	455
Diagrams	456
C8501714.pdf	465
How to Use the Part Lists and Diagrams	466
Ordering Parts	466
Accessories and Supplies	467
Common Hardware	467
Illustrations and Parts Lists	468
Alphabetical Parts List	491