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HP 8550 Service Manual - Page 723

FIRST Fax Information Retrieval Support, field replaceable units FRUs

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feed motor automatic document feeder (ADF) 249 troubleshooting 542 voltage 314 feed roller diagrams 34 high-capacity input (HCI) 34 life span 163 operations 256 removing 399, 441 replacing 543 feed sensor (PS5) operations 307 troubleshooting 543 FEED-ADJ (feeding system) settings 89, 92 feeder belt life span 163 FEEDER menu 81 feeder mode 114 feeder motor removing 387, 452 FEEDER screen 60 feeder, paper accessory power supply PCB 238 options 115 sensor adjustments 115 testing 95 feeding belt cleaning 167, 168 diagrams 31 removing 431 reversal operation 261 sequence of operations 258 feeding belt driver roller diagrams 31 feeding belt link roller diagrams 31 feeding guide condensation in 463 feeding paper, troubleshooting 543 feeding power, testing 154 feeding roller cleaning 167 diagrams 31 feeding system settings 92 feeding, paper arching 258 delivering originals 266 double 280, 281 high-capacity input (HCI) 307 reversal operation 261 simultaneous originals 264 skewed, troubleshooting 545 top pick-up mode 251, 257 troubleshooting 463 ferrite cores, part numbers 685 EN field replaceable units (FRUs) ordering 41 figures, lists of 5 files, firmware image localization installing 136 obtaining 135 filters fan 234 noise 583 fine-adjust CMYK 86 density 121 zoom 126 firmware localization 135, 138 FIRST (Fax Information Retrieval Support Technology) 43 fixing faults 468 flanges, part numbers 687 flapper plate, removing 427 flexible cable connecting 356 disconnecting 355 removing 353 fogging causes of 474 preventing 213 font support 43 foot, rubber part numbers 688 formatter, printer 304 forward speed, scanner motor 191 framing 230 front cover (ADF), identifying 377 front cover (HCI) identifying 434 removing 435 front plate removing 413 FRUs ordering 41 full image function 51 full-color key 50 full-color mode selecting 50 full-color test prints 474 fuses automatic document feeder (ADF) power supply 285 part numbers 688 ratings 238 replacing 541 fusing assembly, removing 332 Index 721

Section	Page
Contents	5
Figures	7
Tables	19
Product information	23
Introduction	25
Copy module	25
Features	25
Specifications	26
Overview	28
Automatic document feeder (ADF)	30
Features	30
Specifications	31
Overview	32
Side high-capacity input (side HCI)	34
Features	34
Specifications	34
Overview	35
Model and serial numbers	37
Safety and regulatory information	37
Declaration of conformity	37
FCC regulations	38
Service approach	39
Service approach overview	41
Parts and supplies	41
Ordering	42
Obtaining related documentation and software	42
Ordering consumables	43
Ordering FRUs	43
Parts exchange program	43
Technical assistance	44
List Server	44
HP ASAP	44
HP FIRST	45
Dealer Response Line	46
HP Software Distribution Center	46
HP Direct	46
Customer Support Sales Center	46
Parts identification	46
Customer Information Centers	46
HP Customer Care Centers (CCC)	47
Warranty	48
Operational overview	49
Control panel	51
Copy module functionality	53
User mode	54
Automatic gradation adjustment	59
Cold reset	59
Original-set indicator (ADF)	60
Warnings and actions	60
Self-diagnostic messages	61
Service mode	62
Overview	62
Navigating service mode screens	65
Copier, display mode (DISPLAY)	67
Copier, I/O mode (I/O)	79
Copier, adjust mode (ADJUST)	85
Copier, run/check mode (FUNCTION)	95
Copier, machine settings (OPTION) mode	100
Copier, test print mode (TEST)	110
Copier, counter mode	113
Feeder	116
Adjustments and maintenance	119
Overview	121
MFP print engine adjustments	121
Parts unique to the HP LaserJet 8550MFP print engine	121
Adjustments unique to the HP LaserJet 8550MFP print engine	122
Copy module adjustments	123
End-user adjustments	123
Mechanical and electrical adjustments	124
Required adjustments when replacing parts or upgrading	131
Upgrading and localizing the copy module firmware	137
ADF adjustments	142
Mechanical adjustments	143
Electrical adjustments	157
Replacing the DADF controller PCB	160
Side HCI adjustments	161
Gap between the printer and the side HCI	161
Base plate position	162
Paper-size change (A4 or letter)	163
Periodically replaced parts	165
Cleaning	166
Cleaning by an end-user	166
Cleaning by service technicians	166
Solvents	166
Cleaning parts on the copy module	167
Cleaning ADF parts	169
Cleaning side HCI parts	175
Lubricating	176
Theory of operation	177
Introduction	179
Notes on the power switch	179
Copy module	180
Functional construction	180
Outline of electrical circuitry	181
Inputs to and outputs from the major PCBs	182
Basic sequence of operations	185
Sequence of operations during copying	187
Copy module exposure system	190
Scanner home position sensor and operation	192
Scanner motor	193
Controlling the scanning lamp	195
Identifying the size of originals when copying from the glass	199
Copy module image processing system	202
CCD	203
CCD driver	204
AP-IP (analog image processing) PCB	205
Digital image processing	208
Control panel	234
Fan	236
Power supply	237
ADF	246
ADF electrical circuitry	246
Communication with the copy module	247
Inputs and outputs to the DADF controller PCB	248
Basic operation	251
Functional overview	252
Picking up originals	258
Reversal operation	263
Reduced page composition	265
Delivery operation	268
Detecting originals	271
Controlling the pick-up motor	277
Controlling the belt motor	279
Detecting jams	281
Improper placement of originals	284
Power supply	287
Motors, solenoids, and sensors	288
PCBs	289
Indicator PCB	290
General timing charts	290
Side HCI	306
Pick-up feed system	309
Power supply	316
Sensors	317
Solenoids and motors	318
PCBs	319
List of variable resistors (VR), LEDs, check pins by PCB	320
Input and output signals to the deck controller PCB	323
General circuit diagram	326
Removal and replacement	329
Required tools	333
Repair notices	334
Copy module	335
Identifying the external covers	335
Removing the lower front cover	336
Removing the upper right cover	336
Removing the upper rear cover	337
Removing the upper left cover	337
Removing the rear cover	338
Removing the upper front cover	339
Removing the scanner motor	340
Removing the scanner motor driver PCB	341
Removing DIMMs on the reader controller PCB	342
Removing the control panel	346
Removing the LCD assembly	348
Removing the flexible cable	355
Removing the scanning lamp and scanning lamp heater	359
Removing the standard white plate cover	365
Removing the intensity-detection PCB	366
Removing the lens-mount cover and CCD unit	367
Removing the electrical unit pullout	369
Removing the reader controller PCB	372
Removing the ECO-2 PCB	373
Removing the AP-IP PCB	374
Removing the copy module main power supply PCB (DCP1)	375
Removing the accessories power supply PCB (DCP2)	376
Removing the power supply cooling fan (FM4)	377
Removing the inverter PCB unit	378
Automatic document feeder (ADF)	379
Identifying external covers	379
Removing the ADF	380
Removing the body cover	382
Mounting the original-width detecting volume	385
Removing the pick-up motor unit	387
Removing the ADF motor unit	389
Removing the belt motor	391
Removing the clutch unit	394
Removing the delivery motor	396
Removing the pick-up roller	398
Removing the separation belt unit	400
Removing the feeding roller unit	401
Removing the registration roller	404
Removing the delivery/reversing roller	409
Removing the delivery roller unit (bottom pick-up mode)	416
Removing the delivery roller unit (top pick-up mode)	418
Removing the reversing guide	421
Removing the stopper plate solenoid	424
Positioning the paper-retaining plate solenoid (SL2)	426
Positioning the paper-deflecting solenoid (SL3)	428
Removing the stamp solenoid	429
Removing the feeding belt	433
Side HCI	436
Identifying the external covers	436
Removing the upper left cover	437
Removing the front cover	437
Removing the rear cover	438
Removing the upper right cover	438
Removing the pick-up unit	439
Removing the pick-up roller	442
Removing the feed roller and separation roller	443
Removing the lifter wire	444
Removing the lifter motor (M1)	454
Removing the feeder motor (M2)	454
Removing the pick-up motor (M3)	455
Removing the deck controller PCB	455
Removing the power supply PCB	456
Troubleshooting	457
System-to-device troubleshooting	459
Pre-troubleshooting checklist	459
Process of elimination	460
Copy module troubleshooting	462
Overview	462
Necessary adjustments for replaced parts	462
Image fault troubleshooting	464
Image faults	478
Numbered error codes	495
Faults not identified by error codes	521
Using the copy module service mode to test parts	528
ADF troubleshooting	530
Fault isolation	530
Numbered error codes	531
Self-diagnosis	535
Check the output of the DADF controller PCB	536
Side HCI troubleshooting	537
Overview	537
User and service LEDs	538
Sensor and switch tests	540
Test pick-up	541
Faults not identified by error codes	543
Parts and diagrams	549
How to use this chapter	553
Printer parts unique to the HPColor LaserJet 8550MFP	554
Stand	557
Screw/ring kit	557
Stand assembly	558
Copy module	560
Screw/ring kit	560
Belt kit	561
Gear/pulley kit	562
Spring kit	562
Assembly location diagram	563
External covers and panels	564
Internal components	566
Power cord terminal assembly	572
Control panel assembly	574
Copyboard cover assembly	576
Mirror assembly 1	578
Electrical tray assembly	580
Dc power supply PCA	582
APC power supply PCA	584
Noise filter PCA	585
Control panel PCA	586
Control panel CPU PCA	587
Control panel inverter PCA	588
Reader controller PCA	589
Analog image processor PCA	590
Motor driver PCA	591
Inverter PCA	592
Connectors	593
ADF	602
Belt kit	602
Bushing kit	603
Gear/pulley kit	603
Pin kit	604
Screw/ring kit	604
Spring kit	606
Assembly locations	607
Mounting hardware	608
External covers and panels	609
DF assembly	610
Document tray assembly	614
Upper cover assembly	616
RF assembly	618
Right paper delivery assembly	632
Paper feed motor assembly	634
Belt drive motor assembly	636
Upper paper guide assembly	638
Lower paper guide assembly	640
Separation roller assembly	642
Paper separation assembly	644
RDF controller PCA	646
Connectors	647
Side HCI	651
Bushing kit	651
Gear/pulley kit	651
Screw/ring kit	652
Spring kit	653
Assembly locations	654
Mounting hardware	655
External covers and panels	656
Internal components	658
Lifter drive assembly	665
Paper pick-up assembly	666
Deck controller PCA	670
Connectors	671
Numerical parts list	674
Alphabetical parts list	682
Index	713
A	713
B	715
C	716
D	720
E	722
F	722
G	724
H	724
I	725
J	726
K	726
L	726
M	728
N	729
O	729
P	730
Q	733
R	733
S	735
T	739
U	740
V	740
W	740
X	741
Y	741

Match case Limit results 1 per page

Index

721

feed motor

automatic document feeder (ADF) 249

troubleshooting 542

voltage 314

feed roller

diagrams 34

high-capacity input (HCI) 34

life span 163

operations 256

removing 399, 441

replacing 543

feed sensor (PS5)

operations 307

troubleshooting 543

FEED-ADJ (feeding system) settings 89, 92

feeder belt

life span 163

FEEDER menu 81

feeder mode 114

feeder motor

removing 387, 452

FEEDER screen 60

feeder, paper

accessory power supply PCB 238

options 115

sensor adjustments 115

testing 95

feeding belt

cleaning 167, 168

diagrams 31

removing 431

reversal operation 261

sequence of operations 258

feeding belt driver roller

diagrams 31

feeding belt link roller

diagrams 31

feeding guide

condensation in 463

feeding paper, troubleshooting 543

feeding power, testing 154

feeding roller

cleaning 167

diagrams 31

feeding system settings 92

feeding, paper

arching 258

delivering originals 266

double 280, 281

high-capacity input (HCI) 307

reversal operation 261

simultaneous originals 264

skewed, troubleshooting 545

top pick-up mode 251, 257

troubleshooting 463

ferrite cores, part numbers 685

field replaceable units (FRUs)

ordering 41

figures, lists of 5

files, firmware image localization

installing 136

obtaining 135

filters

fan 234

noise 583

fine-adjust

CMYK 86

density 121

zoom 126

firmware

localization 135, 138

FIRST (Fax Information Retrieval Support

Technology) 43

fixing faults 468

flanges, part numbers 687

flapper plate, removing 427

flexible cable

connecting 356

disconnecting 355

removing 353

fogging

causes of 474

preventing 213

font support 43

foot, rubber

part numbers 688

formatter, printer 304

forward speed, scanner motor 191

framing 230

front cover (ADF), identifying 377

front cover (HCI)

identifying 434

removing 435

front plate

removing 413

FRUs

ordering 41

full image function 51

full-color key 50

full-color mode

selecting 50

full-color test prints 474

fuses

automatic document feeder (ADF) power supply

285

part numbers 688

ratings 238

replacing 541

fusing assembly, removing 332