Home » HP Manuals » Laser Printers » HP LaserJet P4510 » Manual Viewer

HP LaserJet P4510 Service Manual - Page 128

Laser failure detection, Laser failure, BD failure, Scanner motor start-up failure

Add to My Manuals
Save this manual to your list of manuals

Page 128 highlights

The laser scanner uses two laser diodes to scan two lines simultaneously, producing high-speed laser scanning. After receiving the print command from the host computer, the DC controller PCA activates the scanner motor, which rotates the six-sided scanner mirror. The laser-driver PCA emits light from the two laser diodes according to signals from the DC controller PCA. The two laser beams strike the sixsided scanning mirror and are directed through the focusing lenses and onto the photosensitive drum. The modulated laser beams generate the latent electrostatic image on the photosensitive drum according to the image data signals that the DC controller PCA sends. 1. As it receives a print command from the formatter, the dc controller outputs the SCANNER MOTOR SPEED CONTROL signal (/ACC) and rotates the scanner motor in order to rotate the six-sided mirror. 2. As the scanner motor starts rotating, the dc controller uses a LASER CONTROL signal (CNT0, CNT1, CNT2) to receive the /BD INPUT signal (/BDI) and force the laser to emit light . The dc controller detects the rotational speed of the scanner motor based on the timing the /BD1 signal is input and controls the speed to keep it constant. 3. While the scanner motor rotates at a constant speed, the dc controller passes the VIDEO signals from the formatter on to the laser driver PCA. The laser driver PCA emits light from the two laser diodes according to these signals: VDO1, /VDO1, VDO2, /VDO2. 4. The two laser beams pass through the collimator lens and cylindrical lens and strike the six-sided mirror that is rotating at a constant speed. 5. The laser beams, that are reflected off of the six-sided mirror pass through the focus lens and reflective mirror and focus on the photosensitive drum. The laser beams scan the drum surface at a constant speed. 6. As the six-sided mirror rotates and the laser beam scans the drum surface at a constant speed, a latent image forms on the drum surface. Laser failure detection The DC controller determines a laser/scanner unit failure and notifies the formatter, if the laser/scanner unit encounters the following conditions: ● Laser failure: The laser intensity is not detected for a specified value when the laser is turned on for a specified period during the scanner unit start-up period. ● BD failure: The BD interval is out of a specified value during a print operation. ● Scanner motor start-up failure: The scanner motor does not reach a specified rotation within a specified period from when the scanner motor starts rotation. 114 Chapter 5 Theory of operation ENWW

Section	Page
Product basics	15
Quick access to product information	16
Product comparison	17
HP LaserJet P4014 models	17
HP LaserJet P4015 models	18
HP LaserJet P4515 models	19
Product features	20
Product walkaround	22
Front view	22
Rear view	22
Interface ports	24
Model and serial-number label location	25
Supported operating systems	26
Supported product software	27
Software included with the product	27
Software for Windows	27
HP Web Jetadmin	27
Embedded Web server	27
HP Easy Printer Care	28
Software for Macintosh	28
HP Printer Utility	28
Open the HP Printer Utility	28
HP Printer Utility features	30
Supported printer drivers	30
Supported printer drivers for Windows	30
Supported printer drivers for Macintosh	30
Software for other operating systems	31
Connectivity	32
Supported network protocols	32
Control panel	33
Control-panel layout	34
Use the control-panel menus	36
Show Me How menu	37
Retrieve Job menu	38
Information menu	39
Paper Handling menu	40
Configure Device menu	41
Printing submenu	41
Print Quality submenu	44
System Setup submenu	47
Stapler Stacker submenu	51
MBM-5 (multi-bin mailbox) submenu	51
I/O submenu	52
Resets submenu	58
Diagnostics menu	59
Service menu	60
Paper and print media	61
Supported paper and print media sizes	62
Supported paper and print media types	64
Supported paper types for input options	64
Supported paper types for output options	65
Tray and bin capacity	66
Special paper or print media guidelines	67
Load trays	68
Paper orientation for loading trays	68
Load letterhead, preprinted, or prepunched paper	68
Load envelopes	69
Load Tray 1	70
Load Tray 2 or an optional 500-sheet tray	71
Load an optional 1,500-sheet tray	73
Configure trays	75
Configure a tray when loading paper	75
Configure a tray to match print job settings	75
Configure a tray by using the Paper Handling menu	76
Select the paper by source, type, or size	76
Source	76
Type and size	76
Use paper output options	77
Print to the top (standard) output bin	77
Print to the rear output bin	77
Print to the optional stacker or stapler/stacker	78
Print to the 5-bin mailbox	78
Manage and maintain the product	79
Print the information and show-me-how pages	80
Use the HP Easy Printer Care software	82
Open the HP Easy Printer Care software	82
HP Easy Printer Care software sections	82
Use the embedded Web server	85
Open the embedded Web server by using a network connection	85
Embedded Web server sections	86
Use HP Web Jetadmin software	88
Use security features	89
IP Security	89
Secure the embedded Web server	89
Secure stored jobs	89
Lock the control panel menus	90
Lock the formatter cage	91
Manage supplies	92
Supplies life	92
Approximate print-cartridge replacement intervals	92
Manage the print cartridge	92
Print-cartridge storage	92
Use genuine HP print cartridges	92
HP policy on non-HP print cartridges	92
Print-cartridge authentication	93
HP fraud hotline and Web site	93
Replace supplies and parts	93
Supply replacement guidelines	93
Change the print cartridge	94
Load staples	96
Perform preventive maintenance	97
Reset the maintenance-kit counter	97
Install memory, internal USB devices, and external print server cards	98
Overview	98
Install memory	98
Install product memory	98
Check DIMM installation	102
Save resources (permanent resources)	102
Enable memory for Windows	103
Install internal USB devices	104
Install HP Jetdirect print server cards	107
Install an HP Jetdirect print server card	107
Remove an HP Jetdirect print server card	108
Clean the product	109
Clean the exterior	109
Clean the paper path	109
Clean the paper path automatically	109
Upgrade the firmware	110
Determine the current firmware version	110
Download new firmware from the HP Web site	110
Transfer the new firmware to the product	110
Use FTP to upload the firmware through a browser	110
Use FTP to upgrade the firmware on a network connection	111
Use HP Web Jetadmin to upgrade the firmware	112
Use Microsoft Windows commands to upgrade the firmware	112
Upgrade the HP Jetdirect firmware	112
Theory of operation	115
Basic operation	116
Major print systems	116
Internal components	117
Operating sequence	120
Engine-control system	121
DC controller PCA	121
Motors and fans	122
Failure detection	123
Motor failure	123
Fan motor failure	123
Engine power supply	123
Fuser-control circuit	123
Low-voltage power supply	125
High-voltage power supply	125
Overcurrent/overvoltage protection	126
Laser/scanner system	127
Laser failure detection	128
Image-formation system	129
Image-formation process	129
Block 1: Latent image formation	130
Step 1: Primary charging	130
Step 2: Laser-beam exposure	131
Block 2: Developing	131
Step 3: Developing	131
Block 3: Transfer	131
Step 4: Transfer	132
Step 5: Separation	132
Block 4: Fusing	132
Step 6: Fusing	133
Block 5: Drum cleaning	133
Step 7: Drum cleaning	133
Step 8: Drum charge elimination	133
Pickup, feed, and delivery system	135
Pickup-and-feed block	136
Fuser/delivery block	137
Paper trays	137
Printing from Tray 1	137
Printing from Tray 2	137
Formatter system	137
Sleep mode	138
Resolution Enhancement technology	138
EconoMode	138
Input/output	139
USB	139
Embedded print server	139
Expanded I/O	139
Hard-disk accessory	139
CPU	139
Product memory	139
Read-only memory	139
Random-access memory	139
DIMM slot	139
Nonvolatile memory	140
Memory Enhancement technology	140
PJL overview	140
PML	140
Control panel	140
Removal and replacement	141
Removal and replacement strategy	142
Warnings, cautions, notes, and tips	142
Electrostatic discharge	142
Required tools	143
Service approach	144
Before performing service	144
After performing service	144
Post-service tests	145
Test 1 (print-quality test)	145
Types of screws	146
Parts removal order	147
Product input trays and cabinet wheel locks	148
DC controller diagram	149
User-replaceable parts	151
Print cartridge	151
Memory DIMM	153
Tray 2	154
Tray 2 separation, pickup, and feed rollers	155
Transfer roller	157
Top-accessory cover	158
Envelope feed accessory covers	159
Duplex accessory or cover	160
Tray 2 extension door	161
Rear output bin	162
Fuser	163
Formatter cover, formatter cage, and formatter PCA	164
Reinstallation notes, formatter	165
Installing a new formatter and a new DC controller	165
Service replaceable parts	166
Tray 1 pickup and feed rollers	166
Tray 1 separation roller	169
Registration assembly	171
Top cover	173
Right-side cover	175
Reinstall the right cover	176
Left-side cover	178
Right-front cover	180
Rear-upper cover	183
Control-panel assembly	184
Front cover	186
Fan FN102	188
Fan FN103	190
Pickup-motor assembly (M101)	192
Drum-motor assembly (M102)	194
Lifter-motor assembly (M103)	197
DC controller PCA	200
Reinstallation tip	203
Installing a new formatter and a new DC controller	203
Pickup-drive assembly	204
Reinstall the pickup-drive assembly	208
Fuser-motor assembly (M299)	209
Drum-drive assembly	211
Reinstall the drum-drive assembly	213
Fan FN101	214
Fan FN301	216
Environmental sensor (TH3)	218
High voltage power supply	220
Feed-guide assembly	225
Reinstall the feed-guide assembly	226
Tray 1 paper-pickup assembly	228
Feed-roller assembly	230
Laser/scanner assembly	231
Paper-delivery assembly	233
Reinstall the paper-delivery assembly	236
1,500-sheet feeder assembly	237
1,500-sheet feeder feed rollers	237
1,500-sheet feeder separation roller	238
1,500-sheet feeder rear cover	239
1,500-sheet feeder right-side cover	240
1,500-sheet feeder left-side cover	241
1,500-sheet feeder door	244
1,500-sheet feeder motor	246
1,500-sheet feeder driver PCA	247
1,500-sheet feeder lift-drive assembly	248
Solve problems	251
Troubleshooting checklist	252
Menu map	253
Troubleshooting process	254
Power-on checks	254
Overview	254
Troubleshooting tools	257
Individual component diagnostics	257
LED diagnostics	257
Understand lights on the formatter	257
HP Jetdirect LEDs	257
Heartbeat LED	257
Formatter test	258
Engine diagnostics	258
Engine test	258
Half self test	259
Drum rotation test	259
Paper path sensors test	260
Paper path test	262
Sensor test (interactive)	262
Manual sensor test (special mode test)	262
Manual sensor test 2 (special mode test)	270
Print/stop test	271
Component tests	273
Diagrams	274
Block diagrams	274
Main assemblies	274
Main parts	275
Motors and fans	276
PCAs	277
500-sheet feeder	277
1,500-sheet feeder	278
Connectors	280
DC controller PCA connectors	280
Product base connectors	282
500-sheet paper tray connectors	283
1,500-sheet paper tray connectors	283
Duplexer connectors	284
Envelope feeder connectors	284
General timing chart	285
Circuit diagrams	286
Print quality troubleshooting tools	292
Repetitive image defect ruler	292
Cleaning page	292
Control-panel messages	294
Event log messages	314
Print an event log	314
Show an event log	314
Sample event log	315
Paper-handling problems	316
Jams	316
Common causes of jams	316
Jam locations	318
Clear jams	319
Clear jams from the top-cover and print-cartridge areas	319
Clear jams from the optional envelope feeder	321
Clear jams from the trays	323
Clear jams from Tray 1	323
Clear jams from Tray 2 or an optional 500-sheet tray	323
Clear jams from the optional 1,500-sheet tray	324
Clear jams from the optional duplexer	326
Clear jams from the fuser area	327
Clear jams from the output areas	332
Clear jams from the rear output bin	332
Clear jams from the optional stacker or stapler/stacker	333
Clear paper jams from the optional stacker or stapler/stacker	333
Clear staple jams from the optional stapler/stacker	334
Clear jams from the optional 5-bin mailbox	335
Jam recovery	337
Product feeds incorrect page size	338
Output is curled or wrinkled	339
Product will not duplex or duplexes incorrectly	340
Solve image quality problems	341
Image defects	341
Solve performance problems	346
Solve connectivity problems	347
Solve direct-connect problems	347
Solve network connectivity problems	347
Solve network printing problems	347
Ping test	348
Service mode functions	349
Service menu	349
Product resets	350
Restore factory-set defaults	350
Hard disk initialization	350
NVRAM initialization	350
Cold reset	351
Service ID	351
Restore the service ID	351
Convert the service ID to an actual date	351
Reset page counts	352
Cold reset paper	352
Parts	353
Order parts, accessories, and supplies	354
Order directly from HP	354
Order through service or support providers	354
Order directly through the HP Easy Printer Care software	354
Order replacement parts	354
Paper-handling accessories	355
Print cartridges	356
Maintenance kits	356
Memory	357
Cables and interfaces	357
Paper	358
How to use the parts lists and diagrams	361
Customer/field-replaceable units	362
Assembly locations	364
Covers	368
Internal components	370
PCAs	398
Input devices	404
Output devices	428
Alphabetical parts list	437
Numerical parts list	472
Service and support	507
Hewlett-Packard limited warranty statement	507
Print cartridge limited warranty statement	508
Customer self-repair warranty service	509
Customer support	510
HP maintenance agreements	511
On-site service agreements	511
Next-day on-site service	511
Weekly (volume) on-site service	511
Repacking the device	511
Extended warranty	512
Specifications	513
Physical specifications	514
Electrical specifications	514
Acoustic specifications	516
Operating environment	516
Regulatory information	517
FCC regulations	518
Declaration of conformity	519
Declaration of conformity	519
Safety statements	520
Laser safety	520
Canadian DOC regulations	520
VCCI statement (Japan)	520
Power cord statement (Japan)	520
EMI statement (Korea)	520
Laser statement for Finland	521
Substances table (China)	522

Match case Limit results 1 per page

The laser scanner uses two laser diodes to scan two lines simultaneously, producing high-speed laser

scanning. After receiving the print command from the host computer, the DC controller PCA activates

the scanner motor, which rotates the six-sided scanner mirror. The laser-driver PCA emits light from the

two laser diodes according to signals from the DC controller PCA. The two laser beams strike the six-

sided scanning mirror and are directed through the focusing lenses and onto the photosensitive drum.

The modulated laser beams generate the latent electrostatic image on the photosensitive drum

according to the image data signals that the DC controller PCA sends.

As it receives a print command from the formatter, the dc controller outputs the SCANNER MOTOR

SPEED CONTROL signal (/ACC) and rotates the scanner motor in order to rotate the six-sided

mirror.

As the scanner motor starts rotating, the dc controller uses a LASER CONTROL signal (CNT0,

CNT1, CNT2) to receive the /BD INPUT signal (/BDI) and force the laser to emit light . The dc

controller detects the rotational speed of the scanner motor based on the timing the /BD1 signal is

input and controls the speed to keep it constant.

While the scanner motor rotates at a constant speed, the dc controller passes the VIDEO signals

from the formatter on to the laser driver PCA. The laser driver PCA emits light from the two laser

diodes according to these signals: VDO1, /VDO1, VDO2, /VDO2.

The two laser beams pass through the collimator lens and cylindrical lens and strike the six-sided

mirror that is rotating at a constant speed.

The laser beams, that are reflected off of the six-sided mirror pass through the focus lens and

reflective mirror and focus on the photosensitive drum. The laser beams scan the drum surface at

a constant speed.

As the six-sided mirror rotates and the laser beam scans the drum surface at a constant speed, a

latent image forms on the drum surface.

Laser failure detection

The DC controller determines a laser/scanner unit failure and notifies the formatter, if the laser/scanner

unit encounters the following conditions:

●

Laser failure

: The laser intensity is not detected for a specified value when the laser is turned on

for a specified period during the scanner unit start-up period.

●

BD failure

: The BD interval is out of a specified value during a print operation.

●

Scanner motor start-up failure

: The scanner motor does not reach a specified rotation within a

specified period from when the scanner motor starts rotation.

114

Chapter 5

Theory of operation

ENWW