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Fuser block, Separation, Step 7: Fusing

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The static charge on the back of the paper is decreased with the static charge eliminator to reduce static cling and make it easy to separate the paper. Figure 5-34. Separation Fuser block A toner image is fixed, or fused, onto paper in this block. The toner image transferred on top of the paper through the transfer block can be smeared easily by hands since it is only attracted to paper by static electricity. The toner image on paper is fused by pressure and heat to permanently print it on paper here. Step 7: Fusing A toner image on the paper is fixed onto paper with on-demand fusing method in this step. This printer has a low heat-capacity ceramic heater, which warms up quickly and does not require power during standby. This allows for a short wait period and thus energy-saving. 154 Chapter 5 Theory of operation ENWW

Section	Page
Printer description	25
Chapter contents	25
Printer configurations	27
HP Color LaserJet 3500/3550 printer	27
HP Color LaserJet 3500n/3550n printer	27
HP Color LaserJet 3700 printer	28
HP Color LaserJet 3700n printer	28
HP Color LaserJet 3700dn printer	29
HP Color LaserJet 3700dtn printer	29
Printer features	30
Printer assemblies	33
Front and rear features	33
Site requirements	35
Space requirements	35
Electrical specifications	36
Environmental specifications	37
Printer specifications	39
Duty cycle	39
Print media specifications	40
Supported media weights and sizes	40
Hewlett-Packard warranty statement	43
HP's Premium Protection Print Cartridge Warranty Limited Warranty Statement	44
Premium Protection Warranty Color LaserJet Image Fuser Kit and Image Transfer Kit Limited Warranty S ...	45
Identification	46
Model and serial numbers	46
Power and regulatory information	46
Selecting paper	48
Paper to avoid	48
Paper that can damage the printer	48
Printing on special media	50
Transparencies	50
Glossy paper	50
Colored paper	50
Envelopes	51
Labels	51
Heavy paper	52
HP LaserJet Tough paper	52
Preprinted forms and letterhead	52
Recycled paper	53
Media weight	53
Environmental product stewardship program	55
Protecting the environment	55
Declaration of Conformities	58
Safety statements	61
Laser safety statement	61
Canadian DOC regulations	61
EMI statement (Korea)	61
VCCI statement (Japan)	61
Laser statement for Finland	62
FCC Regulations	63
Service approach	65
Chapter contents	65
Search approach	66
Parts and supplies	67
Ordering parts	67
Ordering supplies	67
Exchange program	68
Supplies	68
World Wide Web	68
HP service parts information CD-ROM	68
HP support assistant CD-ROM	68
Customer care reseller sales and service support center	68
Ordering related documentation and software	69
HP maintenance agreements	70
On-site service agreements	70
Installation and configuration	71
Chapter contents	71
Checking the package contents	72
Unpacking the printer	74
Installing the print cartridge	79
Loading paper into Tray 3 (optional)	81
Loading paper into Tray 2	83
Loading paper into Tray 1 (optional procedure)	85
Connecting power	86
Installing a new control panel overlay (optional)	87
Testing the printer operation	88
Using PowerSave Time	89
To set PowerSave Time	89
To disable/enable PowerSave	89
USB configuration	90
Connecting the USB cable	90
Parallel configuration (HP Color LaserJet 3700 series printer only)	91
Network configuration	92
Enhanced I/O (EIO) configuration (HP color LaserJet 3700 series printer only)	93
HP Jetdirect print servers	93
Available enhanced I/O interfaces	93
NetWare networks	94
Windows and Windows NT networks	94
AppleTalk networks	94
UNIX/Linux networks	94
Printer software	95
Printer drivers	95
Software for networks	96
Utilities	97
Setting security on the printer	100
Locking the control panel	100
Using an ASCII PJL escape sequence to set security	101
Printer memory for the HP Color LaserJet 3700 series printer	102
Installing memory and font DIMMs	103
Enabling memory	107
Enabling the language font DIMM (HP color LaserJet 3700 only)	107
Checking DIMM installation (HP color LaserJet 3700 only)	108
Installing an HP Jetdirect print server card in the HP color LaserJet 3700 series printer	109
To install the HP Jetdirect print server card	109
Installing an HP Jetdirect en3700 external print server	112
Printer maintenance	115
Chapter contents	115
Cleaning the printer and accessories	116
Cleaning spilled toner	116
Managing supplies	118
Supplies life	118
Approximate replacement intervals for supplies for the HP Color LaserJet 3500 series printer	118
Approximate replacement intervals for supplies for the HP Color LaserJet 3550/3700 series printer	118
Locating supplies and parts	120
Replacing supply items	121
Replacing the transfer unit	123
Replacing the fuser and pickup roller	127
Theory of operation	137
Chapter contents	137
Basic operation	138
Operation sequence	138
Power-on sequences	140
Engine control system	143
DC controller PCB	143
Low-voltage power supply circuit	150
Low-voltage power supply circuit	155
Laser/scanner system	163
Laser control	164
Scanner motor control	168
Image formation system	170
Print process	171
Developing section	180
Cartridge cleaning control	187
Transfer section	188
ITB cleaning control	191
Waste toner full detection	191
Transfer (ITB) unit detection	192
Transfer unit life detection	193
ITB self-aligning mechanism	194
Primary transfer roller engaging/disengaging control	195
Secondary transfer roller engaging/disengaging control	196
Secondary transfer roller engaging/disengaging detection	197
Color misregistration control	198
Image stabilization control	201
Pickup/feed system	206
Pickup/feed unit	208
Fuser/delivery unit	213
Duplexing feed unit (HP 3700 printer only)	216
Jam detection	219
Paper feeder	221
Pickup/delivery sequence	222
Paper jam detection	223
Removal and replacement	225
Chapter contents	225
Introduction	228
Removal and replacement strategy	228
Repair notices	228
Caution regarding electrostatic discharge (ESD)	228
Required tools	228
Types of screws	229
Supplies	231
Print cartridges and transfer unit	232
Covers	233
Front door removal	233
Left cover removal	234
Left front cover removal	235
Right cover removal	237
Top cover removal	238
Upper rear door removal	238
Rear cover removal	239
Lower rear door (rear output bin) removal	239
Tray 1 (multipurpose) removal	240
Main Assemblies	241
Transfer unit removal	242
Print cartridge removal	243
Fuser removal	244
Face-down delivery assembly removal	245
Laser/scanner assembly removal	246
Image drive assembly removal	247
Developing engaging drive assembly removal	249
Pick-up/feed assembly removal	249
Main assembly parts	260
Tray 1 pick-up roller removal	261
Tray 1 separation pad removal	261
Tray 2 pick-up roller removal	262
Tray 2 separation pad removal	262
Secondary transfer charging roller removal	263
Fuser sleeve unit removal	263
Pressure roller removal	263
Main thermistor/sub-thermistor removal	263
Thermoswitch removal	263
Feed guide unit removal	264
Swing guide removal, right	266
Swing guide removal, left	269
Switches	274
Door Switch (SW1) removal	274
Test print switch (SW1001) removal	275
Power switch (SW3001) removal	275
Sensors	276
Tray 1 (multipurpose tray) paper sensor (PS1) removal	277
Tray 2 (cassette) paper sensor (PS2) removal	277
Registration paper sensor (PS4) removal	278
Media sensor (PS5) removal	279
Fuser front paper sensor (PS6) removal	280
Fuser delivery paper sensor (PS7) removal	280
Face-down delivery paper sensor (PS8) removal	281
Reversed paper sensor (PS9) removal (HP 3700 only)	281
Duplex feed delivery paper sensor (PS10) removal (HP 3700 only)	282
Rear output bin paper sensor (PS11) removal	283
Color misregistration sensor (PS12) removal	284
Waste toner level sensor (PS13) removal	284
Developing engaging sensor (PS14) removal	285
Environment sensor (PS15) removal	285
Secondary transfer roller engaging sensor (PS16) removal	286
Solenoids and Clutches	287
Tray 1 (multipurpose tray) pick-up solenoid (SL1) removal	287
Tray 2 pick-up solenoid (SL2) removal	288
Secondary transfer roller engaging solenoid (SL4) removal	289
Duplex feed solenoid (SL5) removal (HP 3700 only)	290
Registration clutch (CL1) removal	290
Black (K) development clutch (CL2 - image drive) removal	291
Developing engaging drive clutch (CL3) removal	292
Motor and fans	293
Feed motor (M1) removal	293
Delivery motor (M2) removal	295
Drum motor (M3) removal	295
Developing motor (M4) removal	297
Primary transfer roller engaging motor (M5) removal	298
Exhaust fan (FAN1) removal	301
Circuit Boards	302
DC controller PCB removal	302
Formatter PCB removal	303
High-voltage power supply PCB removal	305
Low-voltage power supply PCB removal	309
Memory controller PCB removal	310
Control Panel PCB removal	311
Miscellaneous parts	312
Swing rod guide, left removal	312
Swing rod/lock guide, right removal	312
Transfer contact assembly removal	312
Developing contact assembly	312
Tray 2 (cassette) parts removal	315
Tray 2 (cassette)	315
Cassette (Tray 2) guide, right, removal	315
500-Sheet paper feeder (Tray 3) covers	320
Front cover removal - 500-sheet paper feeder	320
Right cover removal - 500-sheet paper feeder	321
Left cover removal - 500-sheet paper feeder	321
500-Sheet paper feeder internal parts	322
Pick-up roller removal - 500-sheet paper feeder	322
Separation pad removal - 500-sheet paper feeder	323
Pick-up drive unit removal - 500-sheet paper feeder	323
500-Sheet paper feeder sensor/solenoid/motor/PCB	324
500-Sheet paper feeder PCB removal - 500-sheet feeder	324
Pick-up clutch (CL4) removal - 500-sheet feeder	325
Pick-up solenoid (SL3) removal - 500-sheet feeder	325
Paper sensor (PS3) removal - 500-sheet feeder	326
Troubleshooting	327
Chapter contents	327
Introduction	330
Troubleshooting process	331
Pre-troubleshooting checklist	331
Troubleshooting flowchart	332
Troubleshooting power-on	334
Printer error troubleshooting	336
Status messages	336
Warning messages	336
Error messages	336
Critical error messages	336
Alphabetical printer messages	336
Numerical printer messages	351
Replacement parts configuration	376
Formatter and DC Controller replaced at the same time	376
Formatter (New) replacement configuration	376
Formatter (previously installed in another printer) replacement configuration	377
DC Controller (New) replacement configuration	377
DC Controller (previously installed in another printer) replacement configuration	378
Media sensor (PS5) replacement configuration	378
Color Misregistration Sensor (PS12) replacement configuration	379
Laser/scanner Assembly replacement configuration	379
Fuser replacement configuration	379
Transfer unit (ITB assembly) replacement configuration	379
Paper path troubleshooting	380
Paper path jam areas	381
Paper jam error message	381
Paper path areas jam troubleshooting	384
Paper jam recovery feature	401
Avoiding paper jams	401
General paper path troubleshooting	403
Persistent jams	404
Image formation troubleshooting	405
Print quality problems associated with media	405
Overhead transparency defect	405
Print quality problems associated with the environment	406
Print quality problems associated with paper jams	406
Print quality problems associated with toner buildup	406
Print quality troubleshooting pages	407
Calibrating the printer	407
Using Color	408
HP ImageREt 2400	408
Paper selection	408
Color options (available for the HP Color LaserJet 3700 series printer)	408
Standard red-green-blue (sRGB)	408
Printing in four-colors [CMYK (available for the HP Color LaserJet 3700 series printer)	409
CMYK ink set emulation (PostScript only)	409
Managing color	410
Print in Grayscale	410
Automatic or manual color adjustment	410
Manual color options	410
Matching colors	412
Swatch book color matching (HP Color LaserJet 3700 series printer only)	412
Adjusting color balance	413
Image defects	414
Light image	415
Light color	416
Dark image	416
Dark color	417
Completely blank image	417
All black or solid color	417
Dots in vertical lines	418
Dirt on back of paper	418
Dirt on front of paper	418
Vertical lines	419
White vertical lines	419
Horizontal line	420
White horizontal line	420
Color missing	421
Blank spots	421
Poor fusing	421
Image distortion	422
Color misregistration	422
Smearing	423
Misplaced image	423
Reversed color	424
Snail tracks	424
Repetitive defects troubleshooting	425
Interface troubleshooting	427
Communications checks	427
EIO troubleshooting	427
AUTOEXEC.BAT standard configurations	428
Printer Job Language (PJL) commands	428
@PJL COMMENT	429
@PJL INFO CONFIG	429
@PJL INFO ID	429
@PJL INFO USTATUS	429
@PJL INFO PAGECOUNT	429
@PJL JOB	430
@PJL EOJ	430
@PJL ECHO	430
@PJL USTATUS JOB=ON/OFF	430
@PJL USTATUSOFF	430
Control panel troubleshooting	431
Printing a menu map	431
Information menu	431
Paper handling menu	432
Configure device menu	433
Print quality menu	435
System setup menu	438
I/O menu	442
Resets menu	443
Diagnostics menu	443
Service menu	444
Tools for troubleshooting	446
Embedded Web server (HP Color LaserJet 3700 series printer only)	446
HP Toolbox	448
Printer configuration page	452
Supplies status page	453
Usage page (HP 3700 only)	454
Event log	455
Diagnostics	457
Diagnostics flowchart	457
Engine diagnostics	458
Diagnostics from the Control Panel	460
Printer display menu	460
Diagnostics test menu	460
Paper Path Test	463
Component Test – special mode test	463
Print/Stop Test	466
Information menu	467
Configure device menu/printing menu	467
Configure device menu/resets menu	467
Configure device menu/print quality menu	467
Test pages	469
Engine test page	469
Formatter test page	469
Engine resets	470
Cold reset	470
NVRAM initialization	470
Calibration bypass	471
Calibrate Now	471
Service menu	472
Accessing the Service menu	472
Diagrams	474
Main parts	475
Switches	476
Sensors	477
Solenoids and clutches	478
Motors and fans	479
PCBs	480
Connector locations	482
500-sheet paper feeder connectors	486
General circuit diagram	487
Parts and diagrams	489
Chapter contents	489
Introduction	490
Ordering parts	491
Supplies and accessories	491
Replacement parts configuration	497
Illustrations and parts lists	502
Alphabetical parts list	562
Numerical parts list	575

Match case Limit results 1 per page

The static charge on the back of the paper is decreased with the static charge eliminator to

reduce static cling and make it easy to separate the paper.

Figure 5-34.

Separation

Fuser block

A toner image is fixed, or fused, onto paper in this block.

The toner image transferred on top of the paper through the transfer block can be smeared

easily by hands since it is only attracted to paper by static electricity.

The toner image on paper is fused by pressure and heat to permanently print it on paper

here.

Step 7: Fusing

A toner image on the paper is fixed onto paper with on-demand fusing method in this step.

This printer has a low heat-capacity ceramic heater, which warms up quickly and does not

require power during standby. This allows for a short wait period and thus energy-saving.

154

Chapter 5

Theory of operation

ENWW