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HP LaserJet 4100 Service Manual - Page 459

Clutches and sensors, Printing from tray 1, Tray 1 pickup timing

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Note Clutches and sensors See chapter 7 for locations of switches, sensors, and clutches. Printing from tray 1 The presence of paper in tray 1 is detected by the tray 1 paper sensor (PS105). When the engine controller board receives the /PRNT signal from the formatter, the printer starts the initial rotation phase. (This consists of main motor warm-up, scanner motor warm-up, high-voltage control sequence and fuser warm-up.) When the initial rotation phase ends, the tray 1 pickup solenoid (SL102) is activated. The cam rotates, the paper tray lifter rises, and the media comes in contact with the tray 1 pickup roller. At the same time, the tray 1 pickup roller rotates twice and a sheet of media in tray 1 is picked up. The lifter plate prevents unnecessary sheets from feeding with the first sheet. The sheet then reaches the registration assembly, where its skew is corrected. Then it goes through transfer, separation, and fusing stages; passes through the delivery unit; and is delivered to the output bin. If paper is removed from tray 1 just before it is picked, the tray 1 pickup roller might continue to rotate up to six times and a jam will be detected. Figure 30. Tray 1 pickup timing 120 Theory of operation EN

Section	Page
HP LaserJet 4100MFP, 4101MFP Multi Function Printer Parts, Service Manual.pdf	1
4100&4101mfp.pdf	4
Table of contents	5
List of figures	11
List of tables	13
Product Information	15
Introduction	16
Product configurations	16
HPLaserJet 4100mfp (C9148A)	16
HPLaserJet 4101mfp (C9149A)	16
Product features	17
Product speed and throughput	17
Image quality	17
Paper handling	17
Copying capability	17
Expandable design	18
Product specifications	18
Media specifications	20
Special considerations for ADF documents	20
Supported media for the glass	20
Model and serial numbers	21
Product overview	22
Front view	22
Back view	23
Service approach	25
Service approach	26
Major assemblies	26
Contact HP	27
World Wide Web	27
HP support assistant CD-ROM	27
HP authorized resellers and support	27
HP service agreements	27
Operation	29
Using the ADF unit	30
General guidelines for using the ADF unit	30
Using the glass	31
General guidelines for using the glass	31
Using the control panel	32
Layout and operation	32
Navigation	33
Walk-up copy display	33
Status bar	33
Menus	34
Configure device, diagnostic, and service menus	34
Menu map	35
Maintenance	37
Cleaning the product	38
General guidelines	38
Running the cleaning page	39
Cleaning the ADF delivery guide (clear mylar strip)	39
User-replaceable parts	41
Replacing user-replaceable parts	41
Updating product firmware	43
Downloading a remote firmware update	43
Installing the update	43
RFU installation messages	43
Using HP Web JetAdmin (single update)	44
Using HP Web JetAdmin (multiple or unattended update)	44
Windows parallel connection (local printer)	45
Windows parallel connection (network printer)	45
Troubleshooting RFU installation	46
RFU installation error messages	46
Performing hard-drive disk initialization	47
Cold Reset	47
NVRAM initialization	48
Calibration	49
Performing automatic Calibration	49
Performing manual calibration	50
Lead adjustment for the ADF	50
Center adjustment for the ADF	51
Leading-edge adjustment for the glass	51
Side-edge adjustment for the glass	52
Theory of operation	53
Introduction	54
Overview	54
Document transportation process	54
Document exposure system	54
Light-conversion process	55
General descriptions	56
Scan-unit components	57
ADF components	58
Copy processor board	59
CPB terminology	59
Typical scanning-process flow	60
Copy processor board LEDs	61
Scanner controller board	63
ADF motor circuit	63
Optical-unit motor circuit	63
Scan-unit intake-fan motor circuit	63
Scanner controller board connectors	64
Intermediate PCB	65
Power supply	65
Overcurrent and overvoltage protection	65
Power-supply block diagram	66
Optical unit	67
Inverter PCB	68
Scanning lamp	68
CCD driver PCB	68
ADF document-feed system	69
Overview	69
ADF cover sensor (PS10)	70
Document-detect sensor (PS2)	70
Leading-edge sensor (PS1)	70
ADF motor	70
Document pickup process	70
Document jams	70
Scan-unit intake fan	70
Removal and replacement	71
Removal and replacement strategy	72
Required tools	72
Before performing service	72
After performing service	72
Common fasteners	73
Parts removal order	74
User-replaceable parts	75
ADF input tray	75
ADF pickup roller	76
ADF separation roller	78
ADF separation pad	79
ADF unit	80
Assemblies and covers	81
Control-panel door	81
Scan-unit right-side cover	84
Copy processor board	85
Scan-unit left-side cover	86
Intake fan filter	88
Formatter cage	89
Scan unit	91
Printing-unit top cover	93
Glass	94
Scanning lamp	95
Optical unit	97
ADF door open sensor (PS10)	100
Optical-unit drive gear/motor assembly	101
Scan-unit power supply	103
Inverter PCB	105
Scanner controller PCB	106
Intake fan	108
Troubleshooting	111
Troubleshooting process	113
Preliminary operating checks	114
Installation conditions	114
Media condition	114
Unit condition	114
Basic troubleshooting process flow	115
Basic troubleshooting	116
Power-on defects	118
Troubleshooting with the control panel	119
Control-panel display	119
Event log	119
Print the event log	119
Interpret the event log	120
Display the event log	121
Control-panel messages	122
Troubleshooting with the copy processor board	126
User-level and service-level diagnostics	128
ADF paper-path test	128
To print a paper-path test	128
Diagnostic tests	128
To perform a diagnostic test	128
Service-level diagnostics	129
Service menu	129
To access the service menu (PIN code: 04410002)	129
Jam troubleshooting	130
Jams	130
Clearing repeated ADF jams	131
Creating a customer print job	131
Evaluate the information pages	132
Configuration page	132
Configuration-page elements	132
JetDirect page	134
JetDirect-page elements	134
Supplies status page	135
Supplies-page elements	135
Usage page	136
File directory page	137
File-directory-page elements	137
Image-formation troubleshooting	138
Checking the print cartridge	139
EconoMode	139
Image-defect tables	140
Media troubleshooting	142
Isolate a paper path	142
Use the straightest paper path	142
Isolate the source of the jam	142
Determine where media jams occur	142
Is the MFP is misfeeding or creating multifeed jams	142
Isolate a media brand	143
Isolate a media type	143
Wiring diagrams	144
Parts and diagrams	145
Ordering parts, supplies and getting support	146
Parts	146
Related documentation and software	146
Support	146
Accessories	147
Consumables	147
Common hardware	148
HP Laserjet 4100 differences	148
How to use the parts lists and diagrams	149
Parts lists and diagrams	150
Alphabetical parts list	164
Numerical parts list	166
Index	169
4100&4101MFPSoftwareTechAddendum.pdf	180
Known issues	180
General product	180
HP LaserJet printing system installer	180
HP LaserJet printing system uninstaller	182
Install Network Printer wizard	183
Customization utility	184
Network bidirectional communication	185
Local (IR, parallel, and USB) bidirectional support	186
Web Registration	186
Web installation	186
General printer driver	187
PCL 6 driver	188
PS driver	188
Job Retention	190
Printer Status and Alerts	191
Novell Netware	193
Adobe Acrobat Reader	195
Introduction	197
Section 1.0, General Information	197
Section 2.0, Component Version Summary	197
Sections 3.0 through 6.0, HP LaserJet PCL 6, PCL 5, and PS drivers	197
Driver Common Registry Entries	198
Fonts	199
Other Components	199
Additional information	200
LASERJET 4100 Series Service Manual.pdf	338
Contents	342
Figures	346
Tables	350
Printer description	352
Chapter contents	352
Printer features	353
Product compatibility matrix	357
Identification	359
Model and serial numbers	359
Site requirements	360
Installation requirements	361
Environmental requirements	363
Print media specifications	364
Supported types of print media	367
Types of print media to avoid	368
Weight equivalence table	369
Adhesive labels	370
Overhead transparencies	371
Envelopes	372
Card stock and heavy paper	374
Safety information	375
Toner safety	375
Laser safety	376
Regulatory information	376
Service approach	378
Chapter contents	378
Service approach	379
Parts and supplies	379
Ordering information	379
Printer documentation	380
HP direct ordering for genuine HP parts	381
Exchange program	381
Consumables	381
World Wide Web	381
HP service parts information compact disc	381
HP support assistant compact disc	382
Toner cartridge information	383
Warranty statement	384
Printer warranty	384
Limited warranty for toner cartridge life	384
Printer operation	386
Chapter contents	386
Using the control panel	388
Control panel layout	388
Control panel lights	388
Control panel keys	389
Settings and defaults	390
Control panel menus	391
Quick copy jobs menu	392
Private/stored jobs menu	393
Information menu	394
Paper-handling menu	396
Printing menu	399
Print quality menu	402
Configuration menu	405
I/O menu	408
EIO menu (networked printers)	409
Resets menu	412
Service mode	413
Service menu	414
Page count	416
Maintenance count	416
Maintenance interval	416
Serial number	416
Cold reset paper	416
Diagnostics	416
Clear event log	417
Top margin	417
Tray 1 left margin	417
Trays 2 and 3 left margin	417
Testing the printer	417
Engine test	417
Resetting the printer	418
Cold reset	418
Clearing NVRAM	418
Initialization of NVRAM	418
Initialization of the hard disk	419
System configuration	419
MS-DOS system configuration	419
Parallel DOS commands	419
Printer maintenance	420
Chapter contents	420
Cleaning the printer and accessories	421
Using the printer cleaning page	423
Using the auto-cleaning page	423
Cleaning spilled toner	424
Performing printer maintenance	425
Reset maintenance count	425
Expected life of components	426
Theory of operation	428
Chapter contents	428
Power supply system	430
AC/DC power distribution	430
Overcurrent/overvoltage protection	431
Fuser over-temperature protection	431
High-voltage power distribution	432
Toner-cartridge detection	433
Cartridge memory	433
Engine controller system	434
Engine controller board inputs and outputs	435
Laser/scanner drive	440
Paper-motion monitoring and control	440
Solenoids, sensors, clutches, and switches	440
Engine test print	440
Motors	440
Formatter system	443
PowerSave	443
Resolution Enhancement technology	443
EconoMode	444
Input/output	444
CPU	444
Printer memory	445
DIMM slots	445
PJL overview	446
PML	446
Control panel	446
Image formation system	447
Toner cartridge	448
Photosensitive drum	449
Writing the image	451
Developing the image	452
Transferring the image	453
Image fusing/variable fusing temperature	454
Paper feed system	456
Clutches and sensors	459
Printing from tray 1	459
Printing from tray 2	461
Printing from the optional 500-sheet tray	463
Envelope feeder	466
Duplexer	466
Jams	467
Other controls	468
Environmental detection	468
Basic sequence of operation	469
Removing and replacing parts	472
Chapter contents	472
Removal and replacement strategy	474
Required tools	475
Tools	475
Other helpful tools	475
Removing covers	477
Rear right side cover	477
Control panel	478
Top cover	480
Left side cover	482
Front right side cover	483
Rear cover/rear output bin	484
Tray 1	485
Removing internal assemblies	488
Fuser	488
Firmware DIMM	489
Formatter assembly	490
Output delivery assembly	491
Laser/scanner	493
Cartridge memory	494
Fan	495
Main motor	497
Transfer roller	498
Tray 1 pickup roller	499
Tray 1 pickup assembly	500
Right side toner cartridge guide	503
Registration assembly	504
Paper feed assembly	506
Printer drive assembly (gear train)	508
Delivery drive assembly	509
Separating the engine module from the paper-feed module	510
Engine controller board	512
Paper-feed guide assembly	515
Removing tray assemblies	516
Paper-feed rollers for trays 2, 3, and 4	516
Separation rollers for trays 2, 3, and 4	517
Tray 2 paper-feed module disassembly	518
Tray 3 and 4 paper-feed module disassembly	519
Troubleshooting	522
Chapter contents	522
Troubleshooting process	523
Troubleshooting flowchart	524
Troubleshooting flowchart (continued)	525
Troubleshooting the printing system	526
Preliminary operating checks	526
Power on	527
Engine test	529
Display	530
Event log	530
Printer messages	532
General paper-path troubleshooting	559
Information pages	561
Image quality	566
Image system troubleshooting	583
Reference diagrams	585
Locations of components	585
Paper path	591
Engine controller board	593
Paper-size detection switches	594
Motors and fans	596
Connectors	597
PCAs	600
Sensors, switches, and thermistors	602
Solenoids and clutch	605
Timing	607
Parts and diagrams	608
Chapter contents	608
How to use the parts lists and diagrams	609
Accessories and supplies	610
Common screws and replacement cables	611
Illustrations and parts lists	613
Alphabetical parts list	645
Numerical parts list	652
Index	660
Numerics	660
A	660
B	660
C	660
D	661
E	662
F	662
G	663
H	663
I	663
J	664
K	664
L	664
M	664
N	665
O	665
P	665
Q	667
R	667
S	667
T	668
U	669
V	669

Match case Limit results 1 per page

120

Theory of operation

Clutches and sensors

See chapter 7 for locations of switches, sensors, and clutches.

Printing from tray 1

The presence of paper in tray 1 is detected by the tray 1 paper sensor (PS105).

When the engine controller board receives the /PRNT signal from the formatter, the printer starts the

initial rotation phase. (This consists of main motor warm-up, scanner motor warm-up, high-voltage

control sequence and fuser warm-up.) When the initial rotation phase ends, the tray 1 pickup

solenoid (SL102) is activated.

The cam rotates, the paper tray lifter rises, and the media comes in contact with the tray 1 pickup

roller. At the same time, the tray 1 pickup roller rotates twice and a sheet of media in tray 1 is picked

up. The lifter plate prevents unnecessary sheets from feeding with the first sheet.

The sheet then reaches the registration assembly, where its skew is corrected. Then it goes through

transfer, separation, and fusing stages; passes through the delivery unit; and is delivered to the

output bin.

Note

If paper is removed from tray 1 just before it is picked, the tray 1 pickup roller might continue to rotate

up to six times and a jam will be detected.

Figure 30.

Tray 1 pickup timing

HP LaserJet 4100 Service Manual - Page 459

Clutches and sensors, Printing from tray 1, Tray 1 pickup timing

Page 459 highlights

Clutches and sensors, Printing from tray 1, Tray 1 pickup timing