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HP LaserJet Pro 300 Service Manual - Page 66

Remove the upper-cover assembly 4 of 4

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4. Before you proceed, take note of location of the top cover tabs. Figure 1-56 Remove the upper-cover assembly (3 of 4) 5. Carefully rotate the back side of the top cover up and off of the product to release the tabs, and then remove the cover. NOTE: When you reinstall the upper cover, ensure that all the mounting tabs are correctly seated. See Reinstall the upper cover on page 43. Figure 1-57 Remove the upper-cover assembly (4 of 4) 42 Chapter 1 Removal and replacement ENWW

Section	Page
Removal and replacement	25
Removal and replacement strategy	26
Introduction	26
Removal and replacement strategy	26
Electrostatic discharge	27
Required tools	28
Types of screws	29
Service approach	30
Before performing service	30
After performing service	30
Post-service test	30
Print-quality test	30
Parts removal order	31
Removal and replacement procedures	32
Tray 2 cassette	32
Rollers and pads	33
Replace the transfer roller	33
Replace the pickup roller	34
Repalce the separation roller	36
Reinstall the separation roller	38
Replace the pickup roller and separation pad (Tray 1)	39
Main assemblies	42
Print-cartridge drawer	42
DIMM cover	44
Right cover	45
Reinstall the right cover	47
Rear-upper cover (duplex product)	48
Rear-door stopper and link caps (simplex product)	49
Rear door (simplex product)	50
Rear door (duplex product)	52
Rear cover and feed guide (simplex product)	54
Remove the rear cover and feed guide (simplex product)	54
Rear-lower cover and rear-door links (duplex product)	58
Remove the rear-lower cover and rear-door links (duplex product)	58
Rear-door rib assembly (duplex product)	62
Remove the rear-door rib assembly (duplex product)	62
Link guide	64
Upper-cover assembly	65
Reinstall the upper cover	67
Left cover	68
Remove the left cover	68
Reinstall the left cover	70
Right-front cover and power button	71
Remove the right-front cover and power button	71
Paper-feed guide assembly	72
Control-panel assembly	74
Remove the control-panel assembly	74
Right panel	76
Remove the right panel	76
Front-door assembly	81
Remove the front-door assembly	81
Reinstall the front-door assembly	86
Intermediate transfer belt (ITB)	88
Reinstall the ITB	91
Drum motor (M1) and developer motor (M2)	92
Reinstall the drum motor (M1) and developer motor (M2)	95
Intermediate PCA	96
Remove the intermediate PCA	96
Formatter PCA	98
Special considerations	98
Remove the formatter PCA	98
DC controller PCA	100
Special considerations	100
Remove the DC controller PCA	100
Fuser motor assembly	102
Remove the fuser motor assembly	102
Reinstall the fuser motor assembly	104
High-voltage power-supply PCA	105
Remove the high-voltage power-supply PCA	105
Color-misregistration sensor assembly PCA	108
Remove the color-misregistration sensor assembly PCA	108
Reinstall the color-misregistration sensor assembly	110
Fan	112
Duplex reverse-drive assembly	113
Remove the duplex reverse-drive assembly	113
Fuser	116
Remove the fuser	116
Reinstall the fuser	121
Paper-delivery assembly	122
Remove the paper-delivery assembly	122
Solve problems	125
Solve problems checklist	126
Menu map	126
Troubleshooting process	127
Pretroubleshooting checklist	127
Power-on checks	129
Tools for troubleshooting	130
Engine diagnostics	130
Diagrams	130
Plug/jack locations	130
Location of connectors	131
DC controller PCA	131
Location of major components	132
Major components	132
Solenoids, clutches, and sensors	133
Rollers	135
Motors and fans	136
PCAs	137
General timing charts	138
General circuit diagram	139
CPU/ASIC diagrams	140
HVT/Toner EMP diagram	142
Driver PCA diagram	143
Duplexer PCA diagram	144
FSR diagram	145
Internal print quality test pages	146
Print quality troubleshooting page	146
Print quality assessment page	146
Print the configuration page	146
Print-quality troubleshooting tools	147
Repetitive image defects	147
Calibrate the product	147
Control panel menus	148
Reports menu	148
Quick Forms menu	148
System Setup menu	149
Service menu	153
Network Setup menu	154
Interpret control panel messages	156
Control panel message types	156
Control panel messages	156
10.XXXX Supply error	156
49 Error Turn off then on	156
50.X Fuser error Turn off then on	157
51.XX Error Turn off then on	157
54.XX Error Turn off then on	157
55.X Error Turn off then on	158
57 Fan error Turn off then on	158
59.X Error Turn off then on	158
79 Error Turn off then on	158
79 Service error Turn off then on	159
Black cartridge low	159
Black in wrong position	159
Black very low	159
Cleaning . . .	160
Cyan cartridge low	160
Cyan in wrong position	160
Cyan very low	160
Device error Press [OK]	161
Front door open	161
Genuine HP supply installed	161
Incompatible <color>	161
Incorrect supplies	161
Install <color> cartridge	162
Invalid driver Press [OK]	162
Jam in <location>	162
Jam in tray # Clear jam and then Press [OK]	162
Load tray # <TYPE> <SIZE>	162
Load tray 1 plain <SIZE> Cleaning Mode [OK] to start	163
Load tray <X> Press [OK] for available media	163
Load tray 1 <TYPE> <SIZE>	163
Magenta cartridge low	163
Magenta in wrong position	163
Magenta very low	164
Manual duplex Load tray <X> Press [OK]	164
Manual feed <TYPE> <SIZE> Press [OK] for available media	164
Memory is low Press [OK]	164
Misprint Press [OK]	165
Print failure, press OK. If error repeats, turn off then on.	165
Rear door open	165
Remove shipping lock from <color> cartridge	165
Remove shipping locks from cartridges	165
Replace <color>	166
Supplies low	166
Unexpected size in tray # Load <size> Press [OK]	166
Unsupported <color> Press [OK] to continue	166
Used <color> in use	167
Used <color> installed Press [OK] to continue	167
Used supplies in use	167
Yellow cartridge low	167
Yellow in wrong position	167
Yellow very low	168
Event log messages	169
Clear jams	171
Common causes of jams	171
Jam locations	171
Clear jams in Tray 1	172
Clear jams in Tray 2	173
Clear jams in the fuser area	174
Clear jams in the output bin	176
Clear jams in the duplexer (duplexing models only)	176
Solve paper-handling problems	179
The product picks up multiple sheets of paper	179
The product does not pick up paper	179
Solve image-quality problems	180
Print quality examples	180
Color image defects	184
Clean the product	186
Clean the pickup and separation rollers	186
Clean the paper path	186
Solve performance problems	187
Factors affecting print performance	187
Print speeds	188
The product does not print or it prints slowly	189
The product does not print	189
The product prints slowly	190
Solve product connectivity problems	191
Solve direct-connect problems	191
Solve network problems	191
Poor physical connection	191
The computer is using the incorrect IP address for the product	191
The computer is unable to communicate with the product	192
The product is using incorrect link and duplex settings for the network	192
New software programs might be causing compatibility problems	192
The computer or workstation might be set up incorrectly	192
The product is disabled, or other network settings are incorrect	192
Solve wireless network problems	193
Wireless connectivity checklist	193
The control panel displays the message: The wireless feature on this product has been turned off	194
The product does not print after the wireless configuration completes	194
The product does not print, and the computer has a third-party firewall installed	194
The wireless connection does not work after moving the wireless router or product	194
Cannot connect more computers to the wireless product	195
The wireless product loses communication when connected to a VPN	195
The network does not appear in the wireless networks list	195
The wireless network is not functioning	196
Service mode functions	197
Service menu	197
Secondary service menu	198
Open the secondary service menu	198
Secondary service menu structure	198
Product resets	199
Restore factory-set defaults	199
NVRAM initialization	199
Cold reset	200
Product updates	200
Parts and diagrams	201
Order parts by authorized service providers	202
Orderable parts	202
Whole unit replacement	202
Related documentation and software	203
Supplies and accessories	203
Service parts	204
How to use the parts lists and diagrams	205
Covers	206
Internal assemblies	208
Internal assemblies (1 of 5)	208
Internal assemblies (2 of 5)	210
Internal components (3 of 5)	212
Internal assemblies (4 of 5)	214
Internal assemblies (5 of 5)	216
Internal assemblies (simplex models)	218
Internal assemblies (duplex models)	220
PCAs	222
Input device(s)	224
250-sheet paper feeder (optional Tray 3)	224
Alphabetical parts list	226
Numerical parts list	229
Service and support	233
Hewlett-Packard limited warranty statement	234
HP's Premium Protection Warranty: LaserJet print cartridge limited warranty statement	236
Data stored on the print cartridge	237
End User License Agreement	238
OpenSSL	241
Customer support	242
Repack the product	243
Product specifications	245
Physical specifications	246
Power consumption, electrical specifications, and acoustic emissions	246
Environmental specifications	246
Regulatory information	247
FCC regulations	248
Environmental product stewardship program	249
Protecting the environment	249
Ozone production	249
Power consumption	249
Toner consumption	249
Paper use	249
Plastics	249
HP LaserJet print supplies	250
Return and recycling instructions	250
United States and Puerto Rico	250
Multiple returns (more than one cartridge)	250
Single returns	250
Shipping	250
Residents of Alaska and Hawaii	251
Non-U.S. returns	251
Paper	251
Material restrictions	251
Disposal of waste equipment by users in private households in the European Union	252
Chemical substances	252
Material Safety Data Sheet (MSDS)	252
For more information	253
Declaration of conformity	254
Declaration of conformity (wireless models)	256
Certificate of volatility	258
Types of memory	258
Volatile memory	258
Non-volatile memory	258
Safety statements	259
Laser safety	259
Canadian DOC regulations	259
VCCI statement (Japan)	259
Power cord instructions	259
Power cord statement (Japan)	259
EMC statement (Korea)	260
Laser statement for Finland	260
GS statement (Germany)	261
Substances Table (China)	261
Restriction on Hazardous Substances statement (Turkey)	261
Restriction on Hazardous Substances statement (Ukraine)	261
Additional statements for wireless products	262
FCC compliance statement—United States	262
Australia statement	262
Brazil ANATEL statement	262
Canadian statements	262
European Union regulatory notice	262
Notice for use in France	263
Notice for use in Russia	263
Korean statement	263
Taiwan statement	264
Vietnam Telecom wired/wireless marking for ICTQC Type approved products	264