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HP LaserJet 5000 Service Manual - Page 95

Low Voltage Power Supply Circuit, necessary to turn the power off

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Figure 5-2 Low Voltage Power Supply Circuit If a short circuit or other problems on the load side cause an excessive current flow from the +24 VDC or +3.4 VDC power supplies or generate abnormal voltage, the excess-current protection system and excess-voltage protection system automatically shut off the output voltage to protect the power supplies. If an excess-current or excess-voltage protection system is activated and the power supply circuit does not output DC voltage, it is necessary to turn the power off, correct the problem in the faulty load, then turn the printer on again. The circuit has two fuses which break and cut off the output voltage if excess-current flows through the AC line. 5-4 Functional Information EN

Section	Page
Printer Description	10
Overview	10
Printer Features	11
Identification	14
Model and Serial Numbers	14
Site Requirements	15
Space Requirements	16
Printer Weight (without toner cartridge)	18
Environmental Requirements	19
Paper Specifications	20
Supported Types of Paper	23
Guidelines for Using Paper	24
Paper Weight Equivalence Table	26
Labels	27
Label Construction	27
Transparencies	27
Vellum	27
Envelopes	28
Envelope Construction	28
Envelopes with Double-Side-Seams	28
Envelopes with Adhesive Strips or Flaps	29
Envelope Margins	29
Envelope Storage	29
Card Stock and Heavy Paper	29
Card Stock Construction	30
Card Stock Guidelines	30
Safety Information	31
Laser Safety Statement	31
Canadian DOC Regulations	31
FCC Regulations	32
Laser statement for Finland	33
Luokan 1 laserlaite	33
Klass 1 Laser Apparat	33
Varoitus!	33
Varning!	33
Varo!	33
Varning!	34
Material Safety Data Sheet	34
Environmental Product Stewardship	35
Protecting the Environment	35
This HP LaserJet printer design reduces:	35
Service Approach	36
Overview	36
Service Approach	37
Parts and Supplies	38
Ordering Information	38
Helpful Documentation	39
Phone Numbers for Ordering	40
Exchange Program	40
Consumables	40
Technical Assistance	40
HP AUDIO-TIPS	40
HP FIRST	41
HP CompuServe Forum	41
North American Response Center (NARC)	42
Toner Cartridge Information	43
Refilled Toner Cartridges	43
Recycling Toner Cartridges	43
Warranty Statement	44
Printer Operation	46
Overview	46
Using the Control Panel	47
Control Panel Layout	47
Control Panel Lights	47
Control Panel Keys	48
Settings and Defaults	49
Setting the Display Language	49
Control Panel Menus	50
To change a Control Panel setting:	50
To print a Control Panel menu map:	50
Information Menu	51
Paper Handling Menu	52
Print Quality Menu	55
Printing Menu	58
Configuration Menu	62
I/O Menu	69
EIO Menu (Networked Printers)	72
Resets Menu	74
Service Mode	75
Service Menu	76
Setting the Page Count, Maintenance Count, and Ser...	76
Page Count	77
Maintenance Page Count	79
Serial Number	79
Cold Reset Paper	79
Diagnostics	79
Clear Event Log	79
Testing the Printer	80
Engine Test	80
Resetting the Printer	81
Cold Reset	81
Clearing NVRAM	81
System Configuration	82
MS-DOS System Configuration	82
Parallel DOS Commands	82
Serial MS-DOS Commands	83
Printer I/O Configuration	84
Parallel Menu	84
Advanced Functions	84
Serial Configuration	84
Serial Protocol	84
BAUD Rate	84
Pacing (Handshaking)	85
Printer Maintenance	86
Overview	86
Cleaning the Printer and Accessories	87
Using the Printer Cleaning Page	89
Cleaning Spilled Toner	89
Preventative Maintenance	90
Reset Maintenance Count	90
Expected Life of Components	90
Functional Information	92
Overview	92
Printer Subsystems	93
Power Supply System	94
AC/DC Power Distribution	94
Overcurrent Overvoltage Protection	96
High Voltage Power Distribution	97
Toner Cartridge Detection	98
DC Controller System	98
Laser and Scanner Drive	99
Paper Motion Monitoring and Control	100
Solenoids, Sensors, Clutches, and Switches	100
Engine Test Print	100
Motors	101
Formatter System	103
PowerSave	103
Resolution Enhancement technology (REt)	104
EconoMode	104
Input/Output	105
Parallel Interface	105
Expanded I/O	105
Flash	105
Disk	105
Local Talk I/O	105
CPU	105
Printer Memory	106
Read Only Memory (ROM)	106
Random Access Memory (RAM)	106
DIMM Slots	107
Non-Volatile Memory (NVRAM)	107
Disk Accessory	107
Memory Enhancement technology (MEt)	107
Page Protect	107
PJL Overview	108
PML	108
Control Panel	108
Image Formation System	109
Toner Cartridge	111
Photosensitive Drum	112
Cleaning the Drum	113
Conditioning the Drum	114
Writing the Image	115
Developing the Image	116
Transferring the Image	117
Image Fusing/Variable Fusing Temperature	118
Variable Fusing Temperature	119
Paper Feed System	120
Clutches and Sensors	121
Printing from Tray 1	122
Printing from Tray 2	124
Printing from the Optional 500-sheet and 250sheet...	126
Paper Jam	128
Duplexer	129
Reversing/Refeed System	129
Uncurling Function	133
Paper Jam in the Duplexer	135
Basic Sequence of Operation	136
Removing and Replacing Parts	140
Overview	140
User Installable Accessories	141
Removal and Replacement Strategy	146
Required Tools	146
Removing Covers	149
Rear Door / Rear Output Bin	149
Top Cover	151
Control Panel Overlay and Control Panel	154
Toner Cartridge Door Assembly	156
Front Cover and Tray 1	157
Front Cover Pins	159
Face Down Assembly	160
Left and Right Side Covers	162
Tray 1 Inner Cover	163
Right and Left Corner Covers	165
Removing Assemblies	166
Transfer Roller Assembly	167
Fuser	169
Paper Handling PCA	170
Top Margin Adjustment	171
Main Gear Assembly	173
Pickup Gear Assembly	175
Tray 1 Pickup Solenoid	177
Fan	178
Formatter Assembly	179
Tray 1 Roller	180
Tray 2 Roller	181
Paper Feed Roller Assembly	182
DC Controller Board and Power Supply	185
Paper Feed Belt Assembly	189
Tray 1 Shaft	191
Tray 2 Shaft	193
Reassembly Steps:	194
Tray 1 Lift Plate	195
Tray 1 Separation Pad	196
Paper Guide	197
Paper Path Detect Sensor	198
Face Down Bin Full Sensor	199
Power Connection	201
Registration Assembly	202
Upper Delivery Assembly	204
Delivery Roller Removal	206
Laser Scanner Assembly	208
Main Motor	209
Toner Cartridge Guides	210
Power Inlet Assembly	211
Optional 500-sheet Tray Disassembly	212
Tray Indicator Assembly	214
Left Front Corner Cover Installation	215
Paper Size Spring Assembly	216
D-Roller and Feed Roller	217
Feed Roller Removal	217
D-Roller Removal	217
Gear Assembly and PCA	218
Power Connector	219
Separation Roller	220
Troubleshooting	222
Overview	222
Troubleshooting Process	223
Troubleshooting Process Flow	225
Troubleshooting the Printing System	227
Preliminary Operating Checks	227
Power On	228
Engine Test	230
Engine Test Button Location	231
Printing an Engine Test	231
Display	232
Event Log	233
Display the Event Log	235
Print the Event Log	235
Interpret the Event Log	235
Printer Messages	237
General Paper Path Troubleshooting	261
Paper Path Test	263
Information Pages	264
Menu Map	264
Configuration Page	266
Verify installed options	268
Image Quality	269
Check the Toner Cartridge	269
EconoMode	270
Image Defects	271
Repetitive Defect Ruler	293
Image System Troubleshooting	295
Half Self-Test Functional Check	295
Drum Rotation Functional Check	296
Interface Troubleshooting	297
Communications Check	297
Test Message	297
EIO Troubleshooting	297
JetDirect Configuration	299
Reference Diagrams	300
Locations of Components	300
Sensors and Signals	309
DC Controller PCA Inputs and Outputs	328
Parts and Diagrams	332
Overview	332
How To Use the Parts Lists and Diagrams	333
Ordering Parts	333
Ordering Consumables	333
Accessories and Supplies	335
Common Hardware and Replacement Cables	337
Illustrations and Parts Lists	338
Alphabetical Parts List	373
Numerical Parts List	378