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Printer paper-feed system, Print cartridge - fusing assembly

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CAUTION 6. Fusing stage-During this process, the heat and pressure fuse the toner into the media to produce a permanent image. The media passes between a heated fusing element and a soft pressure roller, which melt the toner and press it into the media. 7. Drum-cleaning stage-During this process, the cleaning blade is in contact with the surface of the drum at all times. As the drum rotates during printing, the cleaning blade wipes excess toner off the drum and stores it in the waste toner receptacle. Print cartridge As the focal point of the image-formation system, the print cartridge contains toner and houses the cleaning, conditioning, and developing stages of the process. The print cartridge contains the photosensitive drum, primary charging roller, developing station, toner cavity, and cleaning station. By including these components (which wear, degrade, or are consumed) in the replaceable print cartridge, the need for many service calls is eliminated. The special photosensitive properties of the drum form an image on the drum surface and then transfer the image to media. The print cartridge does not include a light-blocking shutter. Do not expose the drum to light, which can permanently damage the drum. Protect the print cartridge whenever you remove it. Printer paper-feed system The main input tray and the priority input tray merge into one main input area. Media placed in any of these areas activates the paper detection sensor (PS931), which informs the ECU that media is present. The following steps occur when the product receives a print job: Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 The ECU activates the laser/scanner assembly and the motor. Paper motion begins when the ECU energizes the solenoid (SL1). The paper-pickup roller rotates once. The paper-lift plate pushes the media against the pickup roller. The pickup roller moves the top sheet and advances it to the feed assembly drive rollers. To ensure that only one sheet is fed, a main separation pad and two subpads hold the remainder of the stack in place. The feed-assembly drive rollers advance the media to the paper-top sensor (PS911). This sensor informs the ECU of the exact location of the leading edge of media, so that the image that is being written on the photosensitive drum can be precisely positioned on the page. The feed-assembly drive rollers then advance the media to the transfer area, where the toner image on the photosensitive drum is transferred to the media. After the image is transferred, the media enters the fuser assembly, where heat from the fuser and pressure from the pressure roller permanently bond the toner image to media. The paper-delivery sensor (PS921) determines that the media has successfully moved out of the fusing area. The fuser assembly exit rollers deliver media to either the paper output bin or the straight-through output path, according to the position of the straight-through output path door. 86 Chapter 4 Operational overview ENWW

Section	Page
Product information	17
Product configuration	18
Hardware description	18
Firmware description	18
Software and supported operating systems	18
Product features	20
Overview of product	21
Hardware components	21
Product identification	22
Model and serial numbers	22
Product specifications	23
Physical specifications	23
Environmental specifications	23
Performance	23
Electrical specifications	24
Acoustic emissions	25
Skew specifications	25
Fax specifications	26
Printable area (margins)	26
Battery specifications	26
Warranty statement	28
HP’s Premium Protection print-cartridge warranty	29
Extended warranty	30
Print-cartridge information	31
Refilled print cartridges	31
HP LaserJet printing supplies	31
HP Printing Supplies Returns and Recycling Program information	31
FCC regulations	33
Telephone Consumer Protection Act (United States)	35
IC CS-03 requirements	36
Declaration of Conformity	37
Safety statements	38
Laser safety statement	38
Canada DOC regulations	38
Laser statement for Finland	39
Korean EMI statement	39
Australia	39
Regulatory information for the European Union countries/regions	40
Operation	41
Operating environment	42
Identifying the control-panel components	43
Fax controls	43
Alphanumeric buttons	44
Menu and cancel controls	44
Copy, scan, and start controls	45
Control-panel menu structure	46
To use the control-panel buttons	46
To print the control-panel menu structure	46
Product media specifications	50
Supported media sizes and types	50
Guidelines for using media	52
Paper and transparencies	52
Common media problems	52
Labels	53
Envelopes	53
Card stock and heavy media	54
Loading media	56
Media input tray	56
Priority input tray	56
Specific types of media	56
Selecting originals for the automatic document feeder (ADF)	57
Specifications for ADF originals	57
Media information for the flatbed	58
Loading originals to copy or scan	59
To load originals onto the flatbed scanner	59
To load originals into the ADF input tray	59
Printer output paths	61
Output bin and straight-through output path	61
Maintenance	63
Life expectancies of parts that wear	64
Scanner calibration	65
Cleaning the product	66
Cleaning the glass	66
Cleaning the lid backing	67
Cleaning the paper path	67
Cleaning the print-cartridge area	68
Cleaning the pickup roller	70
Cleaning the printer separation pad	71
User-replaceable parts	72
Replacing the pickup roller	72
Replacing the printer separation pad	74
Replacing an ADF	77
Replacing an ADF pickup-roller assembly	78
Removing and replacing the product control-panel bezel	81
Operational overview	83
Basic functions	84
Basic sequence of operation (formatter-to-printer)	85
Basic sequence of operation (scanner)	87
Formatter system	89
Central processing unit	89
Line interface unit (LIU)	89
Motor controller PCA	89
Flash memory	89
Standard boot process	89
RAM	90
Parallel interface or universal serial bus (USB) interface	90
Control panel	90
EconoMode (Draft mode)	90
MEt	91
Enhanced I/O	91
PJL overview	91
Scanner and ADF functions and operation	92
Scanner functions	92
Scanner operation	93
ADF operation	93
ADF paper path and ADF sensors	94
ADF jam detection	94
Printer functions and operation	95
Engine control unit (power system)	95
Image-formation system	101
Printer paper-feed system	102
Jam detection	103
Fax functions and operation	105
PSTN operation	105
The fax subsystem	105
Formatter in the fax subsystem	105
LIU in the fax subsystem	105
Fax page storage in flash memory	108
Removal and replacement	111
Removal and replacement strategy	113
Required tools	113
Before performing service	113
After performing service	114
Print cartridge	114
Parts removal order	114
Scanner assemblies	117
Printer right-side cover	117
Scanner side covers	118
Automatic document feeder (ADF) assembly	120
ADF pickup-roller assembly	121
ADF document-feed guide/cleanout comb	123
ADF input-tray flag	124
ADF separation pad	125
Control-panel bezel	126
To reinstall the control-panel bezel	127
Control panel	128
Control-panel chassis	129
Speaker	130
Scanner PCA	131
ADF scanner glass	134
Separation of the scanner from the printer	135
Separate the scanner from the printer	135
External components	138
Height guides	138
Left-side door	138
Back cover	139
Printer top cover	141
Front-cover assembly	141
Printer assemblies	146
Laser/scanner assembly	146
Height flapper	146
Left and right support covers (front corner brackets)	147
Transfer upper guide assembly	148
Transfer roller	148
Line interface unit (LIU)	149
Formatter	150
Left bottom frame support	151
Fuser assembly	152
Output rollers	155
Stepping motor	157
Solenoid	157
Fan assembly	158
Pickup assembly	160
Paper lift-plate assembly and pickup roller shaft	161
To reinstall the paper lift-plate assembly	164
Right plate assembly	165
Left plate assembly	166
Bottom assemblies	168
ECU fuses and ECU pan	168
Paper-feed assembly	171
Troubleshooting	175
Basic troubleshooting	177
Control-panel messages	182
Alert and warning messages	182
Critical error messages	190
Event-log codes	193
Solving image-quality problems	195
Checking the print cartridge	195
Solving print image-quality problems	195
Solving scanning (copying) image-quality problems	204
Repetitive image-defect ruler	210
Solving paper-feed problems	211
Jams occur in the printer	211
Solving print paper-feed problems	213
Jams occur in the automatic document feeder (ADF)	215
Solving scanner (copier) paper-feed problems	218
Solving problems with digital subscriber line (DSL) connections	220
Connecting additional devices	221
Dedicated fax line	221
Shared phone line	221
To connect additional devices	221
Functional checks	224
Engine test	224
Control-panel check	224
Half self-test functional check	225
Drum-rotation functional check	226
Heating-element check	226
High-voltage power-supply check	227
Paper-path check	229
Updating or recovering the firmware code	231
Firmware update by using flash executable	231
Firmware-recovery DIMM	231
Troubleshooting tools	233
Printing a configuration report, demonstration page, or menu structure	233
Printing all fax reports at once	233
T.30 protocol trace	233
Service-mode functions	254
Secondary service menu	254
Developer’s menu	255
Adjusting the country/region code parameters	256
Soft reset	257
NVRAM init	257
Printer job language (PJL) software commands	258
System settings for localized products	259
Main wiring	261
Locations of connectors	263
Locations of connectors and switches	264
Parts and diagrams	265
Ordering parts and supplies	266
Parts	266
Related documentation and software	266
Parts that wear	266
Accessories	267
Memory	267
Print cartridges and toner supplies	267
Cables	267
Common hardware	268
Parts kits	269
How to use the parts lists and diagrams	269
Scanner assemblies	270
External assemblies	278
Internal assemblies	284
Alphabetical parts list	302
Numerical parts list	311

Match case Limit results 1 per page

Fusing stage

—During this process, the heat and pressure fuse the toner into the media

to produce a permanent image. The media passes between a heated fusing element and a

soft pressure roller, which melt the toner and press it into the media.

Drum-cleaning stage

—During this process, the cleaning blade is in contact with the

surface of the drum at all times. As the drum rotates during printing, the cleaning blade

wipes excess toner off the drum and stores it in the waste toner receptacle.

Print cartridge

As the focal point of the image-formation system, the print cartridge contains toner and houses

the cleaning, conditioning, and developing stages of the process. The print cartridge contains

the photosensitive drum, primary charging roller, developing station, toner cavity, and cleaning

station. By including these components (which wear, degrade, or are consumed) in the

replaceable print cartridge, the need for many service calls is eliminated. The special

photosensitive properties of the drum form an image on the drum surface and then transfer the

image to media.

CAUTION

The print cartridge does not include a light-blocking shutter. Do not expose the drum to light,

which can permanently damage the drum. Protect the print cartridge whenever you remove it.

Printer paper-feed system

The main input tray and the priority input tray merge into one main input area. Media placed in

any of these areas activates the paper detection sensor (PS931), which informs the ECU that

media is present. The following steps occur when the product receives a print job:

Step 1

The ECU activates the laser/scanner assembly and the motor. Paper motion begins when

the ECU energizes the solenoid (SL1).

Step 2

The paper-pickup roller rotates once. The paper-lift plate pushes the media against the

pickup roller.

Step 3

The pickup roller moves the top sheet and advances it to the feed assembly drive rollers.

To ensure that only one sheet is fed, a main separation pad and two subpads hold the

remainder of the stack in place.

Step 4

The feed-assembly drive rollers advance the media to the paper-top sensor (PS911). This

sensor informs the ECU of the exact location of the leading edge of media, so that the

image that is being written on the photosensitive drum can be precisely positioned on the

page.

Step 5

The feed-assembly drive rollers then advance the media to the transfer area, where the

toner image on the photosensitive drum is transferred to the media.

Step 6

After the image is transferred, the media enters the fuser assembly, where heat from the

fuser and pressure from the pressure roller permanently bond the toner image to media.

The paper-delivery sensor (PS921) determines that the media has successfully moved

out of the fusing area.

Step 7

The fuser assembly exit rollers deliver media to either the paper output bin or the

straight-through output path, according to the position of the straight-through output path

door.

Chapter 4

Operational overview

ENWW