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HP LaserJet 6p/mp Service Manual - Page 65

Paper feed system, Paper Output Bin

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Paper feed system Both the Paper Input Tray and the Single Sheet Input Slot merge into one, main input area. Paper placed in either of these areas enables the Paper Out Sensor (sensor 202), which informs the DC Controller that paper is present. When the printer receives a print job and is ready to print, the DC Controller enables the Laser/ Scanner Assembly and the Motor. Paper motion begins when the DC Controller energizes solenoid SL1. This causes the paper pick up roller to rotate once. Two actions occur as a result of this rotation. First, the paper kick plate pushes the paper against the pick-up roller. Second, the pick-up roller grabs the top sheet and advances it to the Feed Assembly drive rollers. To ensure that only one sheet is fed, a main separation pad, along with two subpads, hold the remainder of the stack in place. The feed assembly drive rollers advance the paper to the Paper Registration photosensor (PS203). This sensor informs the DC Controller of the exact location of the paper's leading edge, so that the image being written on the photosensitive drum can be precisely positioned on the page. The feed assembly drive rollers then advance the paper to the transfer area where the toner image on the photosensitive drum is transferred to paper. After the image is transferred, the paper enters the fusing assembly where heat from the fuser and pressure from the Pressure Roller permanently bond the toner image to paper. The Paper Exit Sensor (PS201) determines that paper has successfully moved out of the fusing area. The fusing assembly exit rollers deliver paper to either the Output Paper Bin or the Front Output slot, depending upon the position of the Face-up/Face-down lever. Figure 5-5 shows a simplified paper path and the locations of the photosensors and rollers. Manual Input Slot Paper Output Bin Paper Input Bin Toner Cartridge Delivery Roller #1 Front Output Slot Paper Exit Sensor (PS201) Heating Element Pressure Roller Paper Out Sensor (PS202) Pick-up Roller Paper Registration Sensor (PS203) Transfer Roller Main Motor Figure 5-5 Simplified paper path EN Paper feed system 63

Section	Page
Contents	7
Figures	11
Tables	13
Product information	15
Chapter contents	15
Printer features	16
Identification	17
HP LaserJet 6L Gold	17
Model and serial	17
Specifications	20
Product overview	21
Service approach	24
Parts Exchange Program	24
Ordering parts	24
Ordering related documentation	24
Contacting HP to place an order	24
Technical assistance	25
HPCustomer Care	25
HP worldwide sales and service offices	27
Warranty	30
Hardware service during the warranty period	30
Hardware service after the warranty period	30
HP LaserJet Toner Cartridge warranty	31
Voltage conversions	31
Site requirements	33
Chapter contents	33
Site requirements	34
Operating environment	34
Printer space requirements	35
The HP C3906A/F Toner Cartridge	36
Storage conditions	36
Storing opened toner cartridges	36
Toner cartridge handling suggestions	37
Operating overview	39
Chapter contents	39
Using the Control Panel	40
Control Panel layout	40
Indicator lights	40
The Control Panel Button	42
Printing a self-test page	43
Continuous self test	46
Printing an engine test	46
Resetting the printer	47
To reset the printer	47
Printer maintenance	49
Chapter contents	49
Life expectancy of consumables	50
Toner cartridge life	51
Saving toner with EconoMode	51
Refilled toner cartridges	52
Recycling toner cartridges	52
Cleaning the printer	53
Cleaning printer components	53
Cleaning spilled toner	54
Functional overview	55
Chapter contents	55
Basic printer functions	56
DC Controller/power system	57
Print engine control system	58
Power system (on DC Controller PCA)	58
Formatter system	60
CPU	60
Read only memory (ROM)	60
Random access memory (RAM)	60
Parallel interface	60
Control Panel	60
Resolution Enhancement technology (REt)	61
EconoMode	61
Memory Enhancement technology (MEt)	61
Enhanced I/O	61
Page Protect	62
PJL overview	62
Image formation system	63
Toner cartridge	63
Step 1: Drum cleaning	64
Step 2: Drum conditioning	64
Step 3: Image writing	64
Step 4: Image developing	64
Step 5: Image transferring	64
Step 6: Image fusing	64
Paper feed system	65
Paper jam detection	67
Basic sequence of operation	68
Removal and replacement	71
Chapter contents	71
Removal and replacement strategy	72
Required tools	73
Installing memory cards (DRAM)	74
Covers and doors	75
Back Cover	75
EP Door Assembly	77
Memory Door	78
Main Cover and Paper Input Assembly	79
Internal assemblies	80
Control Panel	80
Exit Roller Assembly	81
Delivery Assembly	82
Fuser Pressure Plate	84
Heating Element	86
Pressure Roller	89
Face-Up/Face-Down Lever	90
Fuser Exit Roller Assembly	91
Paper Exit Sensor Flag	92
Top assemblies	93
Laser/Scanner Assembly	93
Solenoid	94
Pickup Roller Assembly	96
Paper Feed Frame	99
Transfer Roller Guide and Transfer Roller	103
Kick Plate	104
Separation Pad	106
Subpads	107
Feed Assembly	108
Bottom assemblies	111
Memory Door Guide	111
Motor	112
DC Controller	113
Formatter PCA	116
Troubleshooting	117
Chapter contents	117
General troubleshooting flowchart	118
Paper path and components	120
DC Controller diagram	121
Printer error troubleshooting	122
Priority of errors	122
Printer status messages	123
Service and error messages	125
Image formation troubleshooting	128
Check the toner cartridge	128
Image defect examples	129
Troubleshooting checks	135
Engine test	135
Half self-test functional check	136
Drum rotation functional check	136
High-voltage power supply check	137
Paper curl	139
Troubleshooting tools	140
Paper path check	140
Repetitive image defect ruler	141
Main wiring diagram	142
Parts and diagrams	145
Chapter contents	145
How to use the part lists and diagrams	146
Ordering parts	146
Ordering consumables	146
Accessories and supplies	147
Common hardware	148
Parts diagrams	149
Parts index	169
Alphabetical parts list	169
Numerical parts list	174
Regulatory information	179
Laser Safety (U.S.)	179
Laser Statement (Finland)	180
Toner safety	181
Ozone emission	181
FCC Statement (Class B)	182
VCCI Statement (Japan)	182

Match case Limit results 1 per page

Paper feed system

Both the Paper Input Tray and the Single Sheet Input Slot merge into one, main input area. Paper

placed in either of these areas enables the Paper Out Sensor (sensor 202), which informs the DC

Controller that paper is present.

When the printer receives a print job and is ready to print, the DC Controller enables the Laser/

Scanner Assembly and the Motor. Paper motion begins when the DC Controller energizes solenoid

SL1. This causes the paper pick up roller to rotate once. Two actions occur as a result of this rotation.

First, the paper kick plate pushes the paper against the pick-up roller. Second, the pick-up roller

grabs the top sheet and advances it to the Feed Assembly drive rollers. To ensure that only one

sheet is fed, a main separation pad, along with two subpads, hold the remainder of the stack in place.

The feed assembly drive rollers advance the paper to the Paper Registration photosensor (PS203).

This sensor informs the DC Controller of the exact location of the paper’s leading edge, so that the

image being written on the photosensitive drum can be precisely positioned on the page. The feed

assembly drive rollers then advance the paper to the transfer area where the toner image on the

photosensitive drum is transferred to paper.

After the image is transferred, the paper enters the fusing assembly where heat from the fuser and

pressure from the Pressure Roller permanently bond the toner image to paper. The Paper Exit

Sensor (PS201) determines that paper has successfully moved out of the fusing area. The fusing

assembly exit rollers deliver paper to either the Output Paper Bin or the Front Output slot, depending

upon the position of the Face-up/Face-down lever.

Figure 5-5 shows a simplified paper path and the locations of the photosensors and rollers.

Figure

5-5

Simplified paper path

Manual Input Slot

Paper Output Bin

Toner Cartridge

Delivery Roller #1

Front Output Slot

Paper

Input

Bin

Paper Out Sensor

(PS202)

Paper Exit

Sensor

(PS201)

Heating Element

Pick-up Roller

Pressure Roller

Transfer Roller

Paper Registration

Sensor

(PS203)

Main Motor