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HP 2820 Service Manual - Page 144

Replacing the ADF scanner glass, CAUTION,

UPC - 829160742304

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Replacing the ADF scanner glass CAUTION To avoid contamination from dust or other particulates, wipe off dust from the ADF scanner glass and the frame before removing the glass. Remove the ADF scanning glass in a clean, dust-free area. Do not keep the ADF scanner glass open any longer than necessary. 1 Remove the number 10 torx screw (callout 1), lift out the plastic ADF scanner-glass frame, and then lift out the glass. 1 Figure 5-15 Remove the ADF scanner glass 132 Chapter 5 Removal and replacement ENWW

Section	Page
Product information	13
Chapter contents	13
Device configurations	14
HP Color LaserJet 2820 all-in-one	14
HP Color LaserJet 2830 all-in-one	14
HP Color LaserJet 2840 all-in-one	15
Device features	16
Device parts	18
Front view	18
Back view	18
Model and serial numbers	19
Software components	24
System requirements	24
Software and supported operating systems	24
Software tips	26
Gaining access to the device features	26
Obtaining the latest printing software	26
Other print system software	26
Software for Windows	27
Printer drivers	27
Using Help	27
Software for Macintosh	27
HP Director	27
PPDs (Mac OS 9.2.2)	27
PDEs (Mac OS 10.2 and 10.3)	28
HP Toolbox	28
Embedded Web server (EWS)	28
Software installation	28
Typical installation	28
Minimum installation	29
Uninstalling the printing software	29
Using Add or Remove Programs to uninstall	29
Uninstalling software for Macintosh	30
Specifications	31
Media specifications	35
Supported media weights and sizes	35
General guidelines	36
Paper and print media	37
Special media print speeds	37
Printing and storage environment	38
Envelopes	39
Envelope storage	39
Envelope construction	39
Envelopes with double side-seams	40
Envelopes with adhesive strips or flaps	40
Labels	40
Transparencies	41
Hewlett-Packard limited warranty statement	42
Print Cartridge and Imaging Drum Limited Warranty Statement	43
Print-cartridge information	44
Refilled print cartridges	44
HP LaserJet printing supplies	44
HP Printing Supplies Returns and Recycling Program information	44
Regulatory statements	45
FCC Requirements (United States)	45
Telephone Consumer Protection Act (United States)	46
EU statement for telecom operation	46
New Zealand telecom statements	46
IC CS-03 requirements	46
Declarations of conformity	48
Declaration of conformity	48
Declaration of conformity	49
Country-/region-specific safety statements	50
Laser safety statement	50
Canadian DOC statement	50
Korean EMI statement	50
Finnish laser statement	51
Installation and operation	53
Chapter contents	53
Operating environment	54
Interface ports	55
Control-panel features	56
Input trays	58
Output paths	59
Top output bin	59
Rear output bin	59
Loading media	60
Loading tray 1	60
Loading optional tray 2	61
Loading documents to scan	62
HP Toolbox	65
Viewing HP Toolbox	65
Status tab	66
Fax tab	66
Scan to tab	67
Troubleshooting tab	67
Documentation tab	67
Device Settings pages	68
System Settings tab	68
Print Settings tab	69
Fax Settings tab	69
Copy Settings tab	69
Network Settings tab	69
HP Toolbox links	70
Other links	70
Embedded Web server	71
Features	71
Maintenance	73
Chapter contents	73
Life expectancies of components	74
Cleaning the device	76
Cleaning the device exterior and scanner	76
Cleaning the paper path	77
Managing supplies	80
Supplies life	80
Checking and ordering supplies	80
To check status and order supplies using the control panel	80
To check status and order supplies using the HP Toolbox	81
Storing supplies	81
Replacing and recycling supplies	81
HP policy for non-HP supplies	81
Resetting the device for non-HP supplies	81
HP fraud hotline	82
Theory of operation	83
Chapter contents	83
Introduction	84
Engine control system	88
Basic sequence of operation	88
Power-on sequence	90
Motors and fans	91
Laser/scanner system	92
Pickup and feed system	93
Optional tray 2	95
Jam detection	96
Photosensors and switches	97
Solenoids and clutches	99
Printed circuit assemblies	101
Image-formation system	103
Image-formation process	105
Latent-image-formation stage	106
Step 1: primary charging	106
Step 2: laser-beam exposure	106
Developing stage	107
Step 3: auxiliary developing	107
Step 4: developing	107
Transfer stage	108
Step 5: primary transfer	108
Step 6: secondary transfer	108
Step 7: separation	109
Fusing stage	110
Step 8: fusing	110
Step 9: roller charging (auxiliary transfer belt cleaning roller)	110
Step 10: roller charging (transfer-belt cleaning roller)	111
Step 11: transfer belt cleaning	111
Step 12: drum cleaning	112
Print cartridge	114
Imaging-drum E-label	115
Scanner and ADF functions and operation	116
Scanner functions	116
Scanner operation	116
ADF operation	117
ADF paper path and ADF sensors	117
ADF jam detection	118
Fax functions and operation	119
PSTN operation	119
To receive faxes when you hear fax tones	119
The fax subsystem	119
Formatter in the fax subsystem	120
LIU in the fax subsystem	120
Safety isolation	120
Safety-protection circuitry	120
Data path	121
Hook state	121
Downstream current detection	121
Hook switch control	121
Ring detect	122
Line current control	122
Billing (metering) tone filters	122
Fax page storage in flash memory	122
Stored fax pages	123
Advantages of flash memory storage	123
Removal and replacement	125
Chapter contents	125
Removal and replacement strategy	126
Required tools	126
Screws	126
Electrostatic discharge	127
Before performing service	128
After performing service	128
Post-service tests	128
Test 1 (print-quality test)	128
Test 2 (copy-quality test)	129
Test 3 (fax-quality test)	129
Test 4 (memory-card test)	129
Parts removal order	130
User-replaceable parts	131
Replacing the print cartridges	131
Replacing the imaging drum	133
Replacing the ADF	135
Replacing the ADF pickup-roller assembly	136
Removing the ADF separation pad	142
Replacing the ADF scanner glass	144
Replacing the fuser assembly	145
Replacing the control-panel bezel	146
Replacing the tray 1 pickup roller and separation pad	147
Covers	154
Removing the left cover	154
Removing the right cover	157
Removing the right rear cover	158
Removing the scanning assembly	160
Removing the left rear cover	165
Removing the left upper cover	165
Removing the right upper cover	167
Replacing the memory-card assembly (HP Color LaserJet 2840 all-in-one only)	169
Removing the input/output (I/O) cover	170
Removing the back cover	173
Removing the top cover assembly	174
Removing the upper multipurpose cover	177
Removing the density sensor and top-of-page sensor	179
Removing the multipurpose roller cover	180
Removing the lower multipurpose cover	181
Main assemblies	184
Removing the control panel	184
Removing the left support assembly	185
Removing the right support assembly	186
Removing the laser/scanner assembly	187
Removing the transfer-roller plate	189
Removing the transfer roller	190
Removing the formatter assemblies	192
Removing the formatter cage	192
Removing the formatter and line interface unit (LIU)	194
Removing the E-label reader (for imaging-drum E-labels)	197
Removing the DC controller	199
Removing the top plate	201
Removing the gear assembly	204
Removing the waste-toner sensor	207
Removing the rotary-drive assembly	208
Removing the print-cartridge carousel	211
Aligning the carousel gears	215
Removing the registration-roller assembly	216
Removing the toner-catch tray	216
Removing the feed-drive shaft and belts	217
Removing the power supply cover plate	226
Removing the paper-top sensor	230
Removing the fuser-wrap sensor	231
Motors and fans	234
Removing the fuser motor	234
Removing the carousel-engagement motor	235
Removing the air duct and fan	235
Printed circuit assemblies (PCAs)	237
Removing the sub-high-voltage transformer PCA	237
Removing the high-voltage transformer PCA	238
Removing the low-voltage PCA	238
Trays	241
Removing tray 1 (multipurpose tray)	241
Removing optional tray 2 (250-sheet tray)	242
Removing the optional tray 2 pickup roller	245
Replacing the optional tray 2 separation pad	247
Troubleshooting	249
Support strategy	250
Troubleshooting process	251
Troubleshooting checklist	251
Control-panel messages	256
Alert and warning messages	256
Critical error messages	265
Clearing jams	268
Media jams occur in the device	268
Tips to avoid media jams	268
Where to look for jams	268
To clear a media jam inside the device	269
To clear output area jams	270
Media jams occur in the automatic document feeder (ADF)	272
To clear a media jam from the automatic document feeder (ADF)	272
Print problems	275
Print quality problems	275
Improving print quality	275
Understanding print-quality settings	275
To temporarily change print-quality settings	275
To change print-quality settings for all future jobs	275
Identifying and correcting print defects	275
Print-quality checklist	276
General print quality issues	277
Solving issues with color documents	283
Media-handling problems	284
Print-media guidelines	284
Solving print-media problems	285
Performance problems	286
Scan problems	288
Solving scanned image problems	288
Scan quality problems	289
Preventing problems	289
Solving scan-quality problems	290
Scan-specific error messages	291
Copy problems	292
Preventing problems	292
Image problems	292
Media-handling problems	294
Performance problems	295
Fax problems	297
Problems receiving faxes	297
Problems sending faxes	299
Voice call problems	300
Media-handling problems	301
Performance problems	301
Memory card problems	303
Missing or wrong files	303
Index page not printing	303
Proof sheet not printing	304
Proof sheet not scanning	304
Issues with photo printing	305
Functional tests	307
Engine test	307
Half self-test check	308
Heating element test	308
Cartridge high-voltage contact test	311
Paper-path test	311
Service-mode functions	313
NVRAM initialization	313
Secondary service menu	313
To print secondary service reports	315
Troubleshooting tools	318
Device pages and reports	318
Demo page	318
Configuration page	318
Supplies Status page	318
Usage page	318
Engine-test page	319
Error log	319
Fax reports	319
Fax activity log	319
Fax call report	319
T.30 protocol trace	320
HP Toolbox	329
To view HP Toolbox	329
Troubleshooting tab	329
Service menu	330
Restoring the factory-set defaults	330
Cleaning the paper path	330
Setting the scanner bulb power save time	331
Reducing paper curl	331
Service-only tools	332
Timing charts	332
Locations of connectors	334
DC controller connections	337
Printer calibration	338
Repetitive image defect ruler	339
Main wiring diagram	340
Updating or recovering the firmware code	342
Firmware update by using flash executable	342
Firmware-recovery DIMM	342
Parts and diagrams	345
Chapter contents	345
Ordering parts and supplies	346
Parts	346
Related documentation and software	346
Supplies	346
Accessories	347
Accessories	347
Replacement kits	349
Automatic document feeder and scanner assembly	351
Assembly locations (1 of 2)	354
Assembly locations (2 of 2)	356
Covers	358
Internal assemblies	362
Printed circuit assemblies (PCAs)	392
Alphabetical parts list	394
Numerical parts list	411