HP LaserJet P3010 service manual
HP LaserJet P3010 Series Printers
Service Manual
Additional product information:
www.hp.com/support/ljp3010series
HP LaserJet P3010 Series Printers
Service Manual
Copyright and License
© 2009 Copyright Hewlett-Packard
Development Company, L.P.
Trademark Credits
®
Adobe
is a trademark of Adobe Systems
Incorporated.
Reproduction, adaptation, or translation
without prior written permission is prohibited,
except as allowed under the copyright laws.
The information contained herein is subject
to change without notice.
The only warranties for HP products and
services are set forth in the express warranty
statements accompanying such products
and services. Nothing herein should be
construed as constituting an additional
warranty. HP shall not be liable for technical
or editorial errors or omissions contained
herein.
Part number: CE524-90909
Edition 1, 7/2009
Microsoft®, Windows®, Windows® XP, and
Windows Vista® are U.S. registered
trademarks of Microsoft Corporation.
ENERGY STAR and the ENERGY STAR
mark are registered U.S. marks.
Conventions used in this guide
TIP: Tips provide helpful hints or shortcuts.
NOTE: Notes provide important information to explain a concept or to complete a task.
CAUTION: Cautions indicate procedures that you should follow to avoid losing data or damaging the
product.
WARNING! Warnings alert you to specific procedures that you should follow to avoid personal injury,
catastrophic loss of data, or extensive damage to the product.
ENWW iii
iv Conventions used in this guide ENWW
Table of contents
1 Theory of operation
Basic operation ..................................................................................................................................... 2
Major printer systems .......................................................................................................... 2
Printer block diagram ........................................................................................................... 2
Sequence of operation ......................................................................................................... 3
Normal sequence of operation ............................................................................ 3
Formatter-control system ..................................................................................................................... 4
Sleep mode .......................................................................................................................... 4
Input/output .......................................................................................................................... 4
CPU ..................................................................................................................................... 4
Memory ................................................................................................................................ 5
Optional hard disk ............................................................................................... 5
Firmware ............................................................................................................. 5
Nonvolatile memory ............................................................................................ 5
PJL overview ....................................................................................................................... 5
PML ..................................................................................................................................... 5
Control panel ....................................................................................................................... 5
Engine-control system .......................................................................................................................... 6
Motors, fans, clutches, solenoids, switches, and sensors ................................................... 7
DC controller operations .................................................................................................... 14
Fuser-control circuit ........................................................................................................... 16
Fuser failure detection ....................................................................................... 17
Fuser temperature control ................................................................................. 18
Fuser protective function ................................................................................... 19
Low-voltage power supply ................................................................................................. 20
Overcurrent/overvoltage protection ................................................................... 21
High-voltage power supply ................................................................................................ 22
Formatter ........................................................................................................................... 23
Formatter heartbeat LED .................................................................................. 23
DIMM slots ........................................................................................................ 23
Laser/scanner system ........................................................................................................ 24
Laser failure detection ....................................................................................... 25
Image-formation system ..................................................................................................................... 26
Electrophotographic process ............................................................................................. 26
ENWW v
Image formation process ................................................................................................... 27
Latent-image formation stage ........................................................................... 28
Primary charging .............................................................................. 28
Laser beam exposure ....................................................................... 28
Developing stage .............................................................................................. 29
Print cartridge ................................................................................... 29
Transfer stage ................................................................................................... 30
Fusing stage ..................................................................................... 30
Cleaning stage .................................................................................. 31
Toner detection .................................................................................................................. 32
Pickup, feed, and delivery system ...................................................................................................... 33
Paper trays ........................................................................................................................ 33
Photo sensors and switches .............................................................................................. 34
Solenoids and clutches ...................................................................................................... 36
Tray 1 or Tray 2 .................................................................................................................................. 38
Pickup and feed unit .......................................................................................................... 38
Cassette paper size detection/cassette paper detection ................................... 38
Cassette pickup ................................................................................................. 38
Tray 1 paper pickup ........................................................................................................... 38
Paper pickup and feed ....................................................................................................... 39
Jam detection .................................................................................................................... 40
Additional tray ..................................................................................................................................... 41
Tray driver PCA ................................................................................................................. 41
Paper pickup and feed ....................................................................................................... 42
Media level and size detection ........................................................................................... 43
Jam detection .................................................................................................................... 43
2 Removal and replacement
Removal and replacement strategy ................................................................................................... 46
General cautions during removal and replacement ........................................................... 46
Electrostatic discharge ...................................................................................... 46
Required tools ................................................................................................... 46
Types of screws ................................................................................................ 47
Service approach ............................................................................................................................... 48
Before performing service .................................................................................................. 48
After performing service ..................................................................................................... 48
Post-service test ................................................................................................................ 48
Print-quality test ................................................................................................ 48
Parts removal order ........................................................................................................... 50
Removal and replacement procedures .............................................................................................. 52
Print cartridge, cassettes, and sub cover ........................................................................... 52
Print cartridge .................................................................................................... 52
Tray cassette (Tray 2, Tray 3, or Tray 4) .......................................................... 54
vi ENWW
Sub cover .......................................................................................................... 55
External panels, covers, doors, formatter PCA, DIMM, and EIO disk ............................... 56
EIO disk ............................................................................................................. 56
DIMM cover and DIMM ..................................................................................... 57
Reinstall the DIMM ........................................................................... 58
Formatter cover and formatter PCA .................................................................. 60
Rear-door assembly .......................................................................................... 62
Left cover .......................................................................................................... 66
Right-rear cover ................................................................................................ 68
Tray 1 (multipurpose tray) cover ....................................................................... 69
Cartridge-door assembly ................................................................................... 71
Top-right cover .................................................................................................. 73
Control panel ..................................................................................................... 74
Front-right and right-side cover assembly ......................................................... 76
Lower-right cover and bracket ........................................................................... 80
Reinstall the lower-right cover .......................................................... 82
Top cover .......................................................................................................... 84
Main assemblies ................................................................................................................ 86
Tray 1 (multipurpose tray) pickup roller ............................................................. 86
Tray 1 (multipurpose tray) separation pad ........................................................ 87
Tray 2, Tray 3, or Tray 4 pickup roller ............................................................... 88
Tray 2, Tray 3, or Tray 4 separation pad ........................................................... 90
Tray 2, Tray 3, or Tray 4 base-plate roller assembly ........................................ 91
Transfer roller .................................................................................................... 92
USB port PCA ................................................................................................... 94
Power-switch assembly ..................................................................................... 96
Main fan, fan duct, and environmental sensor .................................................. 98
Fuser ............................................................................................................... 100
Registration assembly ..................................................................................... 102
Duplex media-feed assembly .......................................................................... 104
Laser/scanner ................................................................................................. 107
Engine control unit (ECU) ............................................................................... 110
Cassette pickup (Tray 2) solenoid or Tray 1 (multipurpose tray) pickup
solenoid ........................................................................................................... 115
Fuser motor ..................................................................................................... 117
Sub fan and fan duct ....................................................................................... 118
High-voltage power supply (HVPS) ................................................................. 121
3 Solve problems
Solve problems checklist .................................................................................................................. 128
Menu map ........................................................................................................................................ 130
Troubleshooting process .................................................................................................................. 131
Determine the problem source ........................................................................................ 131
Power subsystem ............................................................................................................ 132
ENWW vii
Power-on checks ............................................................................................. 132
Tools for troubleshooting .................................................................................................................. 133
Individual component diagnostics .................................................................................... 133
LED diagnostics .............................................................................................. 133
LED indicators ................................................................................ 133
Formatter heartbeat LED ................................................................ 133
HP Jetdirect LEDs .......................................................................... 134
Engine diagnostics .......................................................................................... 134
Engine-test button .......................................................................... 134
Fuser test page ............................................................................................... 135
Paper-path test (and automatic sensors test) ................................................. 136
Sensor test (interactive) .................................................................................. 137
A TOP (Top-of-Page) sensor .......................................................... 140
B Fuser output sensor .................................................................... 141
C Duplex sensor ............................................................................. 142
D Paper width sensor 1 .................................................................. 143
E Tray 3 feed sensor ...................................................................... 144
F Tray 4 feed sensor ...................................................................... 145
G FD tray full sensor ....................................................................... 146
H Face up detect sensor ................................................................ 147
I Cartridge-door open switch .......................................................... 148
J Rear cover open sensor .............................................................. 149
K Tray 1 paper sensor .................................................................... 150
L Tray 2 paper sensor .................................................................... 151
M Tray 2 detect switch .................................................................... 152
N Tray 3 paper sensor .................................................................... 153
O Tray 3 detect switch .................................................................... 154
P Tray 4 paper sensor .................................................................... 155
Q Tray 4 detect switch .................................................................... 156
Print/stop test .................................................................................................. 157
Component tests ............................................................................................. 158
Half self-test .................................................................................... 158
Drum rotation test check ................................................................. 158
Diagnostics menu components test ................................................ 158
Diagrams ......................................................................................................................... 160
Block diagrams ................................................................................................ 160
Plug/jack locations .......................................................................................... 162
Location of connectors .................................................................................... 163
ECU controller connections ............................................................ 163
Locations of major components ...................................................................... 165
General timing charts ...................................................................................... 169
General circuit diagram ................................................................................... 170
Internal print quality test pages ........................................................................................ 171
Cleaning page ................................................................................................. 172
viii ENWW
Configuration page .......................................................................................... 172
Print quality troubleshooting tools .................................................................................... 173
Repetitive image-defect ruler .......................................................................... 173
Control-panel menus ....................................................................................................... 174
Use the menus ................................................................................................ 174
Show Me How menu ....................................................................................... 174
Retrieve job menu ........................................................................................... 175
Information menu ............................................................................................ 176
Paper handling menu ...................................................................................... 177
Manage supplies menu ................................................................................... 177
Configure device menu ................................................................................... 178
Printing menu ................................................................................. 178
Print Quality menu .......................................................................... 180
System setup menu ........................................................................ 183
I/O menu ......................................................................................... 187
Resets menu .................................................................................. 194
Diagnostics menu ............................................................................................ 194
Service menu .................................................................................................. 196
Interpret control-panel messages .................................................................................... 197
Control-panel message types ......................................................................... 197
Control-panel messages ................................................................................. 197
Event-log messages ........................................................................................................ 215
Print an event log ............................................................................................ 215
Show an event log ........................................................................................... 215
Sample event-log page ................................................................................... 216
Clear an event log ........................................................................................... 216
Event-log messages ........................................................................................ 217
Clear jams ........................................................................................................................................ 219
Common causes of jams ................................................................................................. 219
Jam locations ................................................................................................................... 220
Clear jams from the input trays ........................................................................................ 222
Clear jams from the duplexer ........................................................................................... 226
Clear jams from the output areas .................................................................................... 231
Clear jams from inside the product .................................................................................. 234
Registration and transfer area ......................................................................... 234
Jam causes and solutions ............................................................................................... 236
Avoid repeated jams ....................................................................................................... 240
Change jam recovery ....................................................................................................... 241
Solve paper-handling problems ........................................................................................................ 242
Product feeds multiple sheets .......................................................................................... 242
Product feeds incorrect page size ................................................................................... 242
Product pulls from incorrect tray ...................................................................................... 243
Paper does not feed automatically .................................................................................. 243
Paper does not feed from Tray 2, 3, or 4 ......................................................................... 244
ENWW ix
Transparencies or glossy paper will not feed .................................................................. 244
Envelopes jam or will not feed in the product .................................................................. 245
Output is curled or wrinkled ............................................................................................. 245
Product does not duplex or duplexes incorrectly (duplex models) .................................. 246
Solve image-quality problems .......................................................................................................... 247
Image defect examples .................................................................................................... 247
Clean the product ............................................................................................................................. 254
Solve performance problems ........................................................................................................... 257
Solve connectivity problems ............................................................................................................. 258
Solve direct-connect problems ........................................................................................ 258
Solve network problems .................................................................................................. 258
Service mode functions .................................................................................................................... 259
Service menu ................................................................................................................... 259
Product resets .................................................................................................................. 260
Restore factory settings .................................................................................. 260
Hard disk initialization ..................................................................................... 260
Skip disk-load .................................................................................................. 260
NVRAM initialization ........................................................................................ 260
Service ID ....................................................................................... 261
Restore service ID .......................................................................... 261
Convert the service ID to an actual date ........................................ 261
Reset serial number ....................................................................... 262
Reset page counts .......................................................................... 262
Product cold reset ........................................................................................... 262
Product updates ............................................................................................................................... 263
Determine the current firmware version ........................................................................... 263
Download new firmware from the HP Web site ............................................................... 263
Transfer the new firmware to the product ........................................................................ 263
Use the flash executable file to update the firmware ...................................... 263
Use FTP to upload the firmware through a browser ....................................... 264
Use FTP to upgrade the firmware on a network connection ........................... 264
Use HP Web Jetadmin to upgrade the firmware ............................................. 265
Use Microsoft Windows commands to upgrade the firmware ......................... 265
Upgrade the HP Jetdirect firmware .................................................................................. 265
4 Parts and diagrams
Order parts by authorized service providers .................................................................................... 268
Order parts, accessories, and supplies ........................................................................... 268
Related documentation and software .............................................................................. 268
Supplies part numbers ..................................................................................................... 268
Accessories part numbers ............................................................................................... 269
Whole-unit replacement part numbers ............................................................................. 270
How to use the parts lists and diagrams .......................................................................................... 271
x ENWW
Assembly locations ........................................................................................................................... 272
Base product (no optional trays or accessories) .............................................................. 272
Base product (optional trays or accessories) ................................................................... 273
Covers .............................................................................................................................................. 274
Internal assemblies (1 of 6) .............................................................................................................. 276
Internal assemblies (2 of 6) .............................................................................................................. 278
Internal assemblies (3 of 6) .............................................................................................................. 280
Internal assemblies (4 of 6) .............................................................................................................. 282
Internal assemblies (5 of 6) .............................................................................................................. 284
Internal assemblies (6 of 6) .............................................................................................................. 286
Input devices .................................................................................................................................... 288
500-sheet input tray (Tray 3 and Tray 4) ......................................................................... 288
Alphabetical parts list ....................................................................................................................... 290
Numerical parts list ........................................................................................................................... 293
Appendix A Service and support
Hewlett-Packard limited warranty statement .................................................................................... 298
HP's Premium Protection Warranty: LaserJet print cartridge limited warranty statement ................ 299
End User License Agreement .......................................................................................................... 300
Customer self-repair warranty service .............................................................................................. 302
Customer support ............................................................................................................................. 303
Repack the product .......................................................................................................................... 304
Service information form .................................................................................................................. 305
Appendix B Specifications
Physical specifications ..................................................................................................................... 308
Electrical specifications .................................................................................................................... 308
Acoustic specifications ..................................................................................................................... 308
Environmental specifications ............................................................................................................ 309
Appendix C Regulatory information
FCC regulations ............................................................................................................................... 312
Environmental product stewardship program ................................................................................... 313
Protecting the environment .............................................................................................. 313
Ozone production ............................................................................................................ 313
Power consumption ......................................................................................................... 313
Toner consumption .......................................................................................................... 313
Paper use ........................................................................................................................ 313
Plastics ............................................................................................................................ 313
HP LaserJet print supplies ............................................................................................... 313
Return and recycling instructions ..................................................................................... 314
United States and Puerto Rico ........................................................................ 314
Multiple returns (more than one cartridge) ..................................... 314
ENWW xi
Single returns ................................................................................. 314
Shipping .......................................................................................... 314
Non-U.S. returns ............................................................................................. 314
Paper ............................................................................................................................... 314
Material restrictions .......................................................................................................... 315
Disposal of waste equipment by users in private households in the European Union .... 315
Chemical substances ....................................................................................................... 315
Material Safety Data Sheet (MSDS) ................................................................................ 316
For more information ....................................................................................................... 316
Declaration of conformity .................................................................................................................. 317
Safety statements ............................................................................................................................. 318
Laser safety ..................................................................................................................... 318
Canadian DOC regulations .............................................................................................. 318
VCCI statement (Japan) .................................................................................................. 318
Power cord statement (Japan) ......................................................................................... 318
EMC statement (Korea) ................................................................................................... 318
Laser statement for Finland ............................................................................................. 319
Substances Table (China) ............................................................................................... 320
Index ................................................................................................................................................................. 321
xii ENWW
1 Theory of operation
Basic operation
●
Formatter-control system
●
Engine-control system
●
Image-formation system
●
Pickup, feed, and delivery system
●
Tray 1 or Tray 2
●
Additional tray
●
ENWW 1
Basic operation
Major printer systems
The product contains the following five systems:
Engine-control system
●
Laser/scanner system
●
Image-formation system
●
Media feed system
●
Option
●
Printer block diagram
Figure 1-1 Printer block diagram
LASER SCANNER SYSTEM
ENGINE CONTROL SYSTEM
IMAGE-FORMATION SYSTEM
MEDIA FEED SYSTEM
OPTION
2 Chapter 1 Theory of operation ENWW
Sequence of operation
The DC controller in the engine-control system controls the operational sequences of the printer. The
table below describes durations and operations for each period of a print operation from when the printer
is turned on until the motor stops rotating
Normal sequence of operation
Table 1-1 Sequence of operation
Name Timing Purpose
WAIT From the time the power switch is turned on or the
STBY (standby) From the end of the WAIT or LSTR period until either
INTR (initial
rotation)
PRINT From the end of the INTR period until the last sheet
LSTR (last
rotation)
door is closed until the printer is ready for a print
operation.
a print command is sent or the power switch is turned
off.
From the time the print command is received until the
temperature of the fuser unit reaches its targeted
temperature.
completes the fuser operation.
From the end of the PRINT period until the main motor
stops rotating.
Brings the product to printable condition. The product
performs the following during the operation:
Detects the print cartridge
●
Maintains the product in printable condition.
Starts up the high-voltage biases, the laser/scanner
and the fuser unit for printing.
Forms the image on the photosensitive drum based
on the VIDEO signals from the formatter. Transfers
and fuses the toner image to the paper.
Moves the last printed sheet out of the product.
The product enters the INTR period as the LSTR
period is completed, if the formatter sends another
print command.
ENWW Basic operation 3
Formatter-control system
The formatter is responsible for the following procedures:
Controlling sleep mode
●
Receiving and processing print data from the various product interfaces
●
Monitoring control-panel functions and relaying product-status information (through the control
●
panel and the network or bidirectional interface)
Developing and coordinating data placement and timing with the DC controller PCA
●
Storing font information
●
Communicating with the host computer through the network or the bidirectional interface
●
The formatter receives a print job from the network or bidirectional interface and separates it into image
information and instructions that control the printing process. The DC controller PCA synchronizes the
image-formation system with the paper-input and -output systems, and then signals the formatter to
send the print-image data.
The formatter also provides the electrical interface and mounting locations for one EIO card and an
additional DIMM.
Sleep mode
NOTE: In the SYSTEM SETUP menu, this item is termed SLEEP DELAY.
This feature conserves power after the product has been idle for an adjustable period of time. When the
product is in SLEEP DELAY, the control-panel backlight is turned off, but the product retains all settings,
downloaded fonts, and macros. The default setting is for SLEEP DELAY to be enabled, and the product
enters SLEEP DELAY after a 30-minute idle time.
The product exists SLEEP DELAY and enters the warm-up cycle when any of the following events
occur:
A print job, valid data, or a PML or PJL command is received
●
A control-panel button is pressed
●
A cover is opened
●
A paper tray is opened
●
The engine-test switch is pressed
●
NOTE: Product error messages override the Sleep message. The product enters SLEEP DELAY at
the appropriate time, but the error message continues to appear.
Input/output
The product receives print data primarily from the embedded HP Jetdirect print server. The product also
has a USB 2.0 port for connecting directly to a computer.
CPU
The formatter incorporates a 540 MHz Coldfire processor.
4 Chapter 1 Theory of operation ENWW
Memory
The random access memory (RAM) on the formatter PCA contains the page, I/O buffers, and the font
storage area. It stores printing and font information received from the host system, and can also serve
to temporarily store a full page of print-image data before the data is sent to the print engine. Memory
capacity can be increased by adding a DIMM to the formatter. Note that adding memory might also
increase the print speed for complex graphics.
NOTE: If the product encounters a problem when managing available memory, a clearable warning
message appears on the control-panel display.
Optional hard disk
This product supports an optional EIO hard disk or an optional secure hard disk as an accessory.
Firmware
The firmware is contained on NAND flash memory soldered on the formatter board. A remote firmware
upgrade process is available, which overwrites the firmware in the NAND flash.
Nonvolatile memory
The product uses nonvolatile memory (NVRAM) to store device and user configuration settings. The
contents of NVRAM are retained when the product is turned off or disconnected.
PJL overview
The printer job language (PJL) is an integral part of configuration, in addition to the standard printer
command language (PCL). With standard cabling, the product can use PJL to perform a variety of
functions such as these:
Two-way communication with the host computer through a network connection or a USB
●
connection. The product can inform the host about such things as the control-panel settings, and
the control-panel settings can be changed from the host.
Dynamic I/O switching. The product uses this switching to be configured with a host on each I/O.
●
The product can receive data from more than one I/O simultaneously, until the I/O buffer is full.
This can occur even when the product is offline.
Context-sensitive switching. The product can automatically recognize the personality (PS or PCL)
●
of each job and configure itself to serve that personality.
Isolation of print environment settings from one print job to the next. For example, if a print job is
●
sent to the product in landscape mode, the subsequent print jobs print in landscape mode only if
they are formatted for landscape printing.
PML
The printer management language (PML) allows remote configuration and status read-back through the
I/O ports.
Control panel
The formatter sends and receives product status and command data to and from the control-panel PCA.
ENWW Formatter-control system 5
Engine-control system
The engine-control system coordinates all product functions, according to commands that the formatter
sends. The engine-control system drives the laser/scanner system, the image formation system, and
the pickup/feed/delivery system.
The engine control system contains the following major components:
Engine-control unit (ECU)
●
DC controller
◦
Low-voltage power supply
◦
High-voltage power supply
●
Figure 1-2 Engine-control system
ENGINE CONTROL SYSTEM
Formatter
Engine controller
LASER SCANNER SYSTEM
DC controller
IMAGE-FORMATION SYSTEM
Low-voltage
power supply
MEDIA FEED SYSTEM
High-voltage
power supply
OPTION
6 Chapter 1 Theory of operation ENWW
Motors, fans, clutches, solenoids, switches, and sensors
Figure 1-3 Motors
Fuser motor
Main motor
Table 1-2 Motors
Description Components driven Fault detection
Main motor (M8001)
Fuser motor (M8002)
Pickup roller
●
Feed roller
●
Transfer roller
●
Photosensitive drum
●
Developing roller
●
Duplex repickup roller (duplex models only)
●
Pressure roller
●
Delivery roller
●
Fuser-delivery roller
●
Duplex-feed roller (duplex models only)
●
Yes
Yes
ENWW Engine-control system 7
Figure 1-4 Fans
Main fan
Sub fan
Table 1-3 Fans
Description Area cooled Type Speed
Main fan (FM1) Inside the product Intake Full
Sub fan (FM2) Inside the product Intake Full
Figure 1-5 Solenoids and clutches (product)
PS4
PS1
M8001
SW501
PS8001
M8002
PS2
PS502
PS225
SL2
PS215
PS3
SL1
PS205
SW235
Table 1-4 Solenoids and clutches (product)
Item Description
SL1 Tray 1 (multipurpose tray) pickup solenoid
SL2 Cassette (Tray 2) pickup solenoid
8 Chapter 1 Theory of operation ENWW
Figure 1-6 Solenoids and clutches (Tray 3 and Tray 4)
M8001
CL1
SL3
PS451
Table 1-5 Solenoids and clutches (Tray 3 and Tray 4)
Item Description
SL3 Paper feeder pickup solenoid
CL1 Paper feeder pickup clutch
1
Tray 3 and Tray 4 are identical 500-sheet input trays.
PS8008
SW461
ENWW Engine-control system 9
Figure 1-7 Switches (product)
PS4
PS1
M8001
SW501
PS8001
PS2
PS502
M8002
PS225
SL2
PS215
PS3
Table 1-6 Switches (product)
Item Description
SW235 Cassette presence switch
SW501 Cartridge-door switch
SL1
PS205
SW235
10 Chapter 1 Theory of operation ENWW
Figure 1-8 Switches (Tray 3 and Tray 4)
M8001
CL1
SL3
PS451
Table 1-7 Switches (Tray 3 and Tray 4)
Item Description
SW461 Paper feeder cassette presence switch
1
Tray 3 and Tray 4 are identical 500-sheet input trays.
PS8008
SW461
ENWW Engine-control system 11
Figure 1-9 Sensors
PS4
PS1
PS8001
PS2
PS502
PS225
PS215
PS205
PS3
PS8008
PS451
PS8008
PS451
Table 1-8 Sensors
Item Description Item Description
PS1 Face-up sensor PS225 Media width sensor
PS2 Fuser delivery sensor PS502 Duplex media-feed sensor (duplex models only)
PS3 Cassette media-presence sensor PS451 Paper feeder cassette media-presence sensor
NOTE: PS451 is used in Tray 3, and Tray 4
12 Chapter 1 Theory of operation ENWW
Table 1-8 Sensors (continued)
Item Description Item Description
PS4 Face-down tray media-full sensor PS8001 Rear door sensor
PS205 Tray 1 (multipurpose tray) media-presence
sensor
PS215 Top-of-Page (TOP) sensor
PS8008 Paper feeder media-feed sensor
NOTE: PS8008 is used in Tray 3, and Tray 4
ENWW Engine-control system 13
DC controller operations
The DC controller controls the operational sequences of the product systems.
Figure 1-10 DC controller block diagram
Engine controller
Motor
AC input
Fuser
Print cartridge
Formatter
Low-voltage
power supply
High-voltage
power supply
DC controller
Fan
Solenoid
Photointerrupter
Switch
Optional paper-feeder
Laser/scanner
Control panel
Table 1-9 DC controller controlled components
Component Designator Description
Motor M8001 Main motor
M8002 Fuser motor
Fan FM1 Main fan
FM2 Sub fan
Solenoid SL1 Tray 1 (multipurpose tray) pickup solenoid
SL2 Cassette (Tray 2) pickup solenoid
14 Chapter 1 Theory of operation ENWW
Table 1-9 DC controller controlled components (continued)
Component Designator Description
Photointerrupter PS1 Face-up sensor
PS2 Fuser delivery sensor
PS3 Cassette media presence sensor
PS4 Face-down tray (output bin) media-full sensor
PS205 Tray 1 (multipurpose tray) presence sensor
PS215 Top-Of-Page (TOP) sensor
PS225 Media width sensor
PS451 Paper feeder cassette media-presence sensor
NOTE: PS451 is used in Tray 3, and Tray 4
PS502 Duplex media-feed sensor (duplex models only)
PS8001 Rear door sensor
PS8008 Paper feeder media-feed sensor
Switch SW235 Cassette-presence switch
NOTE: PS8008 is used in Tray 3, and Tray 4
SW240 Power switch
SW250 Test Print switch
SW501 Cartridge-door switch
ENWW Engine-control system 15
Fuser-control circuit
The fuser-control circuit monitors and controls the temperature in the fuser. The product uses ondemand fusing. The fuser-control circuit consists of the following major components:
Fuser heater (H1); heats the fusing film
●
Thermistor (TH1 and TH2); detects the fuser temperature (contact type)
●
Main thermistor (TH1); controls the temperature in the fuser (contact type)
◦
Sub thermistor (TH2); detects a one-sided temperature rise in the fuser and controls the
◦
temperature in the fuser (contact type)
Thermoswitch (TP1); prevents abnormal temperature rise in the fuser (contact type)
●
Figure 1-11 Fuser control circuit
TP1
H1
Fuser film
TH2
DC controller
TH1
FUSER HEATER CONTROL signal
Fuser heater control
circuit
Engine controller unit
Pressure roller
FUSER TEMPERATURE signal
Fuser heater safety
circuit
Fuser control circuit
16 Chapter 1 Theory of operation ENWW
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