HP LaserJet Pro 400 MFP M425 Troubleshooting Manual
LASERJET PRO 400 MFP
Troubleshooting Manual
M425
HP LaserJet Pro 400 MFP M425 Series
Troubleshooting Manual
Copyright and License
Trademark Credits
© 2012 Copyright Hewlett-Packard
Development Company, L.P.
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: CF286-91012
Edition 1, 4/2012
Microsoft®, Windows®, Windows® XP,
and Windows Vista® are U.S. registered
trademarks of Microsoft Corporation.
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 .......................................................................................................... 1
Basic operation ........................................................................................................................ 2
Major product systems ............................................................................................... 2
Product components .................................................................................................. 3
Sequence of operation ............................................................................................... 4
Engine control system ............................................................................................................... 6
DC controller ............................................................................................................ 7
Motor control ............................................................................................................ 9
Fan control ............................................................................................................. 10
High-voltage power supply ....................................................................................... 11
Fuser control circuit .................................................................................. 12
Fuser temperature control ........................................................... 13
Fuser protection function ............................................................ 14
Fuser failure detection ................................................................ 14
Low-voltage power supply ........................................................................................ 16
Protective function .................................................................................... 16
Safety ..................................................................................................... 17
Low-voltage power supply unit failure detection ............................................ 17
Laser scanner system .............................................................................................................. 18
Laser failure detection .............................................................................................. 19
Image-formation system ........................................................................................................... 20
Image-formation process .......................................................................................... 21
Latent-image formation stage .................................................................................... 22
Step 1: Primary charging .......................................................................... 22
Step 2: Laser-beam exposure ..................................................................... 23
Developing stage .................................................................................................... 23
Step 3: Development ................................................................................ 23
Transfer stage ......................................................................................................... 24
Step 4: Transfer ....................................................................................... 24
Step 5: Separation ................................................................................... 24
Fusing stage ........................................................................................................... 25
Step 6: Fusing ......................................................................................... 25
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Drum cleaning stage ................................................................................................ 26
Step 7: Drum cleaning .............................................................................. 26
Pickup and feed system ........................................................................................................... 27
Jam detection ......................................................................................................... 30
Paper feeder (optional Tray 3) ................................................................................................. 32
Paper feeder operation ............................................................................................ 34
Jam detection ......................................................................................................... 35
Scanner system ...................................................................................................................... 37
Scanner power-on sequence of events ....................................................................... 37
Copy or scan sequence of events .............................................................................. 38
Fax functions and operation .................................................................................................... 39
Computer and network security features ..................................................................... 39
PSTN operation ...................................................................................................... 39
Receive faxes when you hear fax tones ...................................................................... 39
Distinctive ring function ............................................................................................ 40
Use fax with voice over IP services ............................................................................ 40
The fax subsystem ................................................................................................... 41
Fax card in the fax subsystem ................................................................................... 41
Safety isolation ........................................................................................ 41
Safety-protection circuitry .......................................................................... 41
Data path ................................................................................................ 42
Hook state ............................................................................................... 42
Downstream device detection .................................................................... 43
Hook switch control .................................................................................. 43
Ring detect .............................................................................................. 43
Line current control ................................................................................... 43
Billing- (metering-) tone filters ..................................................................... 43
Fax page storage in flash memory ............................................................................ 43
Stored fax pages ...................................................................................... 44
Advantages of flash memory storage .......................................................... 44
USB flash drive ...................................................................................................................... 45
2 Solve problems ............................................................................................................... 47
Solve problems checklist ......................................................................................................... 48
Menu map ............................................................................................................................ 50
Troubleshooting process .......................................................................................................... 51
Pre-troubleshooting checklist ..................................................................................... 51
Determine the problem source ................................................................................... 53
Power subsystem ..................................................................................................... 54
Power-on checks ...................................................................................... 54
Control-panel checks ............................................................................................... 54
vi ENWW
Tools for troubleshooting ......................................................................................................... 55
Component diagnostics ............................................................................................ 55
LED diagnostics ........................................................................................ 55
Network LEDs ........................................................................... 55
Control panel LEDs .................................................................... 55
Engine diagnostics ................................................................................... 56
Engine test ................................................................................ 56
Diagrams ............................................................................................................... 57
Plug/jack locations ................................................................................... 57
Locations of major components .................................................................. 58
General timing chart ................................................................................. 60
General circuit diagrams ........................................................................... 61
Use HP Device Toolbox (Windows) ........................................................................... 64
Internal print-quality test pages .................................................................................. 65
Clean the paper path ............................................................................... 65
Print the configuration page ....................................................................... 65
Print-quality troubleshooting tools .............................................................................. 65
Repetitive image defect ruler ...................................................................... 65
Control panel menus ................................................................................................ 67
HP Web Services menu ............................................................................. 67
Reports menu ........................................................................................... 67
Quick Forms menu ................................................................................... 68
USB Flash Drive menu ............................................................................... 69
System Setup menu ................................................................................... 69
Service menu ........................................................................................... 72
Network Setup menu ................................................................................ 75
Interpret control-panel messages ............................................................................... 77
Control panel message types ..................................................................... 77
Control panel messages ............................................................................ 77
49 Error, Turn off then on ........................................................... 77
50.x Fuser Error ........................................................................ 77
51.XX Error .............................................................................. 77
54.XX Error .............................................................................. 78
55.X Error ................................................................................ 78
57 Fan Error, Turn off then on ..................................................... 78
59.X Error ................................................................................ 79
79 Error Turn off then on ............................................................ 79
79 Service error ........................................................................ 79
Black cartridge low ................................................................... 79
Black cartridge very low ............................................................. 80
Cleaning .................................................................................. 80
ENWW vii
Communication error. ................................................................ 80
Device error, press OK .............................................................. 81
Document feeder door is open. Canceled fax. .............................. 81
Door open ................................................................................ 81
Fax is busy. Canceled send. ....................................................... 81
Fax is busy. Redial pending. ....................................................... 82
Fax receive error. ...................................................................... 82
Fax Send error. ......................................................................... 83
Fax storage is full. Canceling the fax receive. ............................... 83
Fax storage is full. Canceling the fax receive. ............................... 83
Fax storage is full. Canceling the fax send. ................................... 84
Genuine HP supply installed ....................................................... 84
Incompatible black .................................................................... 84
Install black cartridge ................................................................. 84
Invalid driver Press [OK] ............................................................ 84
Jam in Tray 1, Clear jam and then press OK ................................ 85
Load Tray 1 <TYPE> <SIZE>, Press OK to use available media ....... 85
Load Tray 1, <PLAIN> <SIZE> / Cleaning mode, OK to start ......... 85
Load tray <X> Press [OK] for available media .............................. 85
Load tray <X> <TYPE> <SIZE> .................................................... 85
Manual Duplex Load Tray 1, Press OK ........................................ 86
Manual feed <SIZE> <TYPE>, Press OK to use available media ...... 86
Memory is low. Press OK. .......................................................... 86
Misprint, Press OK ..................................................................... 86
No dial tone. ............................................................................ 87
No fax answer. Canceled send. .................................................. 87
No fax answer. Redial pending. ................................................. 87
No fax detected. ....................................................................... 88
Print failure, press OK. If error repeats, turn off then on. ................. 88
Rear door open ......................................................................... 88
Remove shipping material from toner cartridge ............................. 89
Replace black cartridge ............................................................. 89
Unexpected size in tray <X> Load <size> Press [OK] ..................... 89
Unsupported black cartridge Press [OK] to continue ...................... 89
Used black cartridge is installed Press [OK] to continue ................. 90
Event-log messages ................................................................................................. 91
Print the event log ..................................................................................... 91
Show an event log ................................................................................... 91
Event log messages .................................................................................. 91
Clear jams ............................................................................................................................ 94
Jam locations .......................................................................................................... 94
viii ENWW
Clear jams from the document feeder ........................................................................ 95
Clear a jam in Tray 1 .............................................................................................. 96
Clear a jam in Tray 2 .............................................................................................. 98
Clear a jam in optional Tray 3 ................................................................................ 100
Clear jams from the output bin ................................................................................ 101
Clear a jam in the duplexer area ............................................................................ 101
Clear a jam in the fuser area .................................................................................. 102
Solve paper-handling problems .............................................................................................. 104
The product picks up multiple sheets of paper ........................................................... 104
The product does not pick up paper ........................................................................ 104
Solve image quality problems ................................................................................................ 105
Print quality examples ............................................................................................ 105
Clean the product ................................................................................................................ 110
Clean the pickup and separation rollers ................................................................... 110
Clean the paper path ............................................................................................ 110
Clean the scanner glass strip and platen .................................................................. 110
Clean the document feeder pickup rollers and separation pad .................................... 111
Clean the touchscreen ........................................................................................... 112
Solve performance problems ................................................................................................. 113
Factors affecting print performance ......................................................................... 113
Print speeds ........................................................................................... 114
The product does not print or it prints slowly ............................................................. 114
The product does not print ....................................................................... 114
The product prints slowly ......................................................................... 115
Solve connectivity problems ................................................................................................... 116
Solve direct-connect problems ................................................................................. 116
Solve network problems ......................................................................................... 116
Poor physical connection ......................................................................... 116
The computer is using the incorrect IP address for the product ...................... 116
The computer is unable to communicate with the product ............................ 117
The product is using incorrect link and duplex settings for the network .......... 117
New software programs might be causing compatibility problems ................ 117
The computer or workstation might be set up incorrectly .............................. 117
The product is disabled, or other network settings are incorrect .................... 117
Solve wireless network problems ............................................................................. 118
Wireless connectivity checklist ................................................................. 118
The control panel displays the message: The wireless feature on this product
has been turned off ................................................................................ 119
The product does not print after the wireless configuration completes ............ 119
The product does not print, and the computer has a third-party firewall
installed ................................................................................................ 119
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The wireless connection does not work after moving the wireless router or
product ................................................................................................. 119
Cannot connect more computers to the wireless product .............................. 119
The wireless product loses communication when connected to a VPN ........... 120
The network does not appear in the wireless networks list ........................... 120
The wireless network is not functioning ...................................................... 120
Service mode functions ......................................................................................................... 121
Service menu ........................................................................................................ 121
Service menu settings .............................................................................. 121
Restore the factory-set defaults ................................................................. 121
Secondary service menu ........................................................................................ 121
Open the secondary service menu ............................................................ 122
Secondary service menu structure ............................................................. 122
Product resets ....................................................................................................... 123
NVRAM initialization .............................................................................. 123
Super NVRAM initialization ..................................................................... 123
Solve fax problems ............................................................................................................... 124
Fax troubleshooting checklist .................................................................................. 124
Solve problems receiving faxes ............................................................................... 126
The fax does not respond ........................................................................ 126
The fax has a dedicated phone line ........................................... 126
An answering machine is connected to the product ..................... 126
A telephone handset is connected to the product ......................... 127
The Answer Mode setting is set to the Manual setting ................... 127
Voice mail is available on the fax line ........................................ 127
The product is connected to a DSL phone service ........................ 128
The product uses a fax over IP or VoIP phone service ................... 128
An error message displays on the control panel ......................................... 129
The No fax detected. message displays ..................................... 129
The Communication error. message displays .............................. 129
The Fax storage is full. message displays ................................... 130
The Fax is busy. message displays ............................................ 130
A fax is received but does not print .......................................................... 131
The Private Receive feature is on ............................................... 131
Sender receives a busy signal .................................................................. 131
A handset is connected to the product ........................................ 131
A phone line splitter is being used ............................................. 131
No dial tone .......................................................................................... 131
Fax cuts off or prints on two pages ........................................................... 132
Solve problems sending faxes ................................................................................. 132
An error message displays on the control panel ......................................... 133
x ENWW
The Communication error. message displays .............................. 133
No dial tone. .......................................................................... 133
The Fax is busy. message displays ............................................ 134
The No fax answer. message displays ....................................... 134
Document feeder paper jam ..................................................... 135
The Fax storage is full. message displays ................................... 135
Scanner error ......................................................................... 135
The control panel displays a Ready message with no attempt to send the fax . 136
The control panel displays the message "Storing page 1" and does not
progress beyond that message ................................................................. 136
Faxes can be received, but not sent .......................................................... 136
Unable to use fax functions from the control panel ...................................... 137
Unable to use speed dials ....................................................................... 137
Unable to use group dials ....................................................................... 137
Receive a recorded error message from the phone company when trying to
send a fax ............................................................................................. 138
Unable to send a fax when a phone is connected to the product .................. 138
Solve fax performance problems ............................................................................. 139
Faxes are sending slowly ........................................................................ 139
Fax quality is poor ................................................................................. 140
Solve DSL problems ............................................................................................... 140
Cannot send or receive a fax on a PBX line ............................................... 140
Manually update the firmware ............................................................................................... 141
Appendix A Service and support ..................................................................................... 143
Hewlett-Packard limited warranty statement ............................................................................. 144
HP's Premium Protection Warranty: LaserJet toner cartridge limited warranty statement ................. 146
HP policy on non-HP supplies ................................................................................................ 147
HP anticounterfeit Web site ................................................................................................... 148
Data stored on the toner cartridge .......................................................................................... 149
End User License Agreement .................................................................................................. 150
OpenSSL ............................................................................................................................. 153
Customer support ................................................................................................................. 154
Repack the product .............................................................................................................. 155
Appendix B Product specifications ................................................................................... 157
Physical specifications .......................................................................................................... 158
Power consumption, electrical specifications, and acoustic emissions .......................................... 158
Environmental specifications .................................................................................................. 158
ENWW xi
Appendix C Regulatory information ................................................................................. 159
FCC regulations ................................................................................................................... 160
Environmental product stewardship program ........................................................................... 161
Protecting the environment ...................................................................................... 161
Ozone production ................................................................................................. 161
Power consumption ............................................................................................... 161
Toner consumption ................................................................................................ 161
Paper use ............................................................................................................. 161
Plastics ................................................................................................................. 161
HP LaserJet print supplies ....................................................................................... 162
Return and recycling instructions ............................................................................. 162
United States and Puerto Rico .................................................................. 162
Multiple returns (more than one cartridge) .................................. 162
Single returns .......................................................................... 162
Shipping ................................................................................ 162
Non-U.S. returns .................................................................................... 163
Paper .................................................................................................................. 163
Material restrictions ............................................................................................... 163
Disposal of waste equipment by users ...................................................................... 164
Electronic hardware recycling ................................................................................. 164
Chemical substances ............................................................................................. 164
Material Safety Data Sheet (MSDS) ......................................................................... 164
For more information ............................................................................................. 164
Declaration of conformity ...................................................................................................... 166
Declaration of conformity ...................................................................................................... 168
Safety statements ................................................................................................................. 170
Laser safety .......................................................................................................... 170
Canadian DOC regulations .................................................................................... 170
VCCI statement (Japan) .......................................................................................... 170
Power cord instructions .......................................................................................... 170
Power cord statement (Japan) ................................................................................. 170
EMC statement (Korea) .......................................................................................... 171
Laser statement for Finland ..................................................................................... 171
GS statement (Germany) ........................................................................................ 172
Substances Table (China) ....................................................................................... 172
Restriction on Hazardous Substances statement (Turkey) ............................................. 172
Restriction on Hazardous Substances statement (Ukraine) ........................................... 172
Additional statements for telecom (fax) products ....................................................................... 173
EU Statement for Telecom Operation ....................................................................... 173
New Zealand Telecom Statements ........................................................................... 173
Additional FCC statement for telecom products (US) .................................................. 173
xii ENWW
Telephone Consumer Protection Act (US) .................................................................. 174
Industry Canada CS-03 requirements ...................................................................... 174
Vietnam Telecom wired/wireless marking for ICTQC Type approved products ............. 175
Additional statements for wireless products .............................................................................. 176
FCC compliance statement—United States ................................................................ 176
Australia statement ................................................................................................ 176
Brazil ANATEL statement ........................................................................................ 176
Canadian statements ............................................................................................. 176
European Union regulatory notice ........................................................................... 176
Notice for use in France ......................................................................................... 177
Notice for use in Russia ......................................................................................... 177
Mexico statement .................................................................................................. 177
Korean statement .................................................................................................. 177
Taiwan statement .................................................................................................. 178
Vietnam Telecom wired/wireless marking for ICTQC Type approved products ............. 178
Index ............................................................................................................................... 179
ENWW xiii
xiv ENWW
List of tables
Table 1-1 Product components ................................................................................................................ 3
Table 1-2 Sequence of operation ............................................................................................................ 5
Table 1-3 DC controller electrical components .......................................................................................... 7
Table 1-4 Motor control components ....................................................................................................... 9
Table 1-5 Fan control components ........................................................................................................ 10
Table 1-6 Fuser control circuit components ............................................................................................. 12
Table 1-7 Pickup and feed system electrical components .......................................................................... 28
Table 1-8 Paper feeder components ...................................................................................................... 33
Table 2-1 Plug/jack locations ............................................................................................................... 57
Table 2-2 Major components (1 of 2) .................................................................................................... 58
Table 2-3 Major components (2 of 2) .................................................................................................... 59
Table 2-4 Repetitive defects .................................................................................................................. 66
Table 2-5 Event-log messages ............................................................................................................... 91
Table 2-6 Event-log-only messages ........................................................................................................ 92
Table 2-7 Secondary Service menu ..................................................................................................... 122
Table B-1 Physical specifications ......................................................................................................... 158
Table B-2 Operating-environment specifications .................................................................................... 158
ENWW xv
xvi ENWW
List of figures
Figure 1-1 Product systems ..................................................................................................................... 2
Figure 1-2 Product components ............................................................................................................... 3
Figure 1-3 Optional Tray 3 components .................................................................................................. 4
Figure 1-4 Engine control system components ........................................................................................... 6
Figure 1-5 DC controller ........................................................................................................................ 7
Figure 1-6 Main motor .......................................................................................................................... 9
Figure 1-7 Fan control ......................................................................................................................... 10
Figure 1-8 High-voltage power supply ................................................................................................... 11
Figure 1-9 Fuser control circuit .............................................................................................................. 12
Figure 1-10 Fuser temperature control ................................................................................................... 13
Figure 1-11 Low-voltage power supply .................................................................................................. 16
Figure 1-12 Laser scanner system .......................................................................................................... 18
Figure 1-13 Image-formation system ...................................................................................................... 21
Figure 1-14 Image-formation process .................................................................................................... 22
Figure 1-15 Primary charging process ................................................................................................... 22
Figure 1-16 Laser-beam exposure ......................................................................................................... 23
Figure 1-17 Development process ......................................................................................................... 23
Figure 1-18 Transfer process ................................................................................................................ 24
Figure 1-19 Separation from the drum ................................................................................................... 24
Figure 1-20 Fusing .............................................................................................................................. 25
Figure 1-21 Drum cleaning .................................................................................................................. 26
Figure 1-22 Pickup and feed system paper path ..................................................................................... 27
Figure 1-23 Pickup and feed system electrical components ....................................................................... 28
Figure 1-24 Jam detection sensors ........................................................................................................ 30
Figure 1-25 Paper-feeder paper path .................................................................................................... 32
Figure 1-26 Paper feeder signal flow .................................................................................................... 33
Figure 1-27 Paper feeder electrical components ..................................................................................... 34
Figure 1-28
Figure 2-1 Major components (1 of 2) ................................................................................................... 58
Figure 2-2 Major components (2 of 2) ................................................................................................... 59
Figure 2-3 Timing diagram ................................................................................................................... 60
Figure 2-4 Circuit diagram — main unit (1 of 2) ..................................................................................... 61
Jam detection sensors ........................................................................................................ 35
ENWW xvii
Figure 2-5 Circuit diagram — main unit (2 of 2) ..................................................................................... 62
Figure 2-6 Circuit diagram — optional Tray 3 ........................................................................................ 63
xviii ENWW
1 Theory of operation
Basic operation
●
Engine control system
●
Laser scanner system
●
Image-formation system
●
Pickup and feed system
●
Paper feeder (optional Tray 3)
●
Scanner system
●
Fax functions and operation
●
USB flash drive
●
ENWW 1
Basic operation
Major product systems
The product includes the following systems:
Engine control system
●
Laser scanner system
●
Image-formation system
●
Pickup and feed system
●
Accessory
●
Figure 1-1 Product systems
LASER SCANNER SYSTEM
ENGINE CONTROL
SYSTEM
IMAGE-FORMATION SYSTEM
PICKUP, FEED AND DELIVERY SYSTEM
ACCESSORY
2 Chapter 1 Theory of operation ENWW
Product components
Figure 1-2 Product components
1
2 8 9
4 5 73 6
1010
182122 1920
Table 1-1 Product components
Item Description Item Description
1 Fuser delivery roller 12 Multipurpose tray (Tray 1) separation pad
2 Face-down delivery roller 13 Registration roller
11
12
13
13
14
15
16
17
ENWW
3 Pressure roller 14 Feed roller
4 Fuser film assembly 15 Tray 2 cassette pickup roller
Basic operation
3
Table 1-1 Product components (continued)
Item Description Item Description
5 Fuser 16 Tray 2 cassette separation pad
6 Document feeder pickup rollers 17 Tray 2 cassette
7 Document feeder separation pad 18 Duplex re-pickup roller
8 Laser scanner 19 Photosensitive drum
9 Toner cartridge 20 Transfer roller
10 Registration shutter 21 Duplex feed assembly
11 Multipurpose tray (Tray 1) pickup roller 22 Duplex feed roller
Figure 1-3 Optional Tray 3 components
1 2
Item Description Item Description
1 Tray 3 cassette 3 Tray 3 feed roller
2 Tray 3 pickup roller 4 Tray 3 separation pad
3
4
Sequence of operation
The product operational sequence is controlled by the DC controller that is on the engine control
system. The following table describes each period of a print operation from when the product is turned
on until the motor stops rotating.
4 Chapter 1 Theory of operation ENWW
Table 1-2 Sequence of operation
Period Duration Purpose Remarks
WAIT From the time the power is
turned on or the door is
closed until the drum-phase
adjustment is complete
STBY (Standby period) From end of the WAIT or
LSTR period until either the
print command is received
from the formatter or the
power is turned off
INTR (Initial rotation) From the time the print
command is received until the
fuser temperature reaches its
target temperature
PRINT From the end of INTR period
until the fuser paper sensor
detects the trailing edge of
paper
LSTR (Last rotation) From the end of the PRINT
period until the delivery motor
stops rotating
Brings the product to the
ready state
Maintains the product in
readiness for a print
command
Prepares the high-voltage
biases, laser scanner, and
fuser for printing
Forms the images on the
photosensitive drum and
transfers the toner image to
the print media
Moves the printed sheet out
of the product, and stops the
output from the laser scanner
and high-voltage biases
The product detects the toner
level, cartridge presence, and
environment.
The product enters sleep
mode when the formatter
sends a sleep command.
The product enters the INTR
period as soon as the
formatter sends another print
command.
ENWW
Basic operation
5
Engine control system
The engine control system coordinates all product functions and drives the other three systems.
The engine control system contains the DC controller, high-voltage power supply PCA, and low-voltage
power supply.
Figure 1-4 Engine control system components
Formatter
ENGINE CONTROL SYSTEM
LASER SCANNER SYSTEM
Engine controller
DC controller
IMAGE-FORMATION SYSTEM
Low-voltage
power supply
PICKUP, FEED AND
DELIVERY SYSTEM
High-voltage
power supply
ACCESSORY
6 Chapter 1 Theory of operation ENWW
DC controller
The DC controller controls the product operational sequence.
Figure 1-5 DC controller
Engine controller
AC input
Fuser
Transfer roller
Cartridge
Laser scanner
assembly
Motor
Fan
Low-voltage
power supply
Solenoid
Photointerrupter
Switch
DC controller
High-voltage
power supply
Accessory
Formatter
ENWW
Table 1-3 DC controller electrical components
Component type Symbol Description
Fan FM1 Main fan
Motor M1 Main motor
M2 Scanner motor
Solenoid SL1 Multipurpose tray pickup solenoid
SL2 Cassette pickup solenoid
SL3 Duplex reverse solenoid
Engine control system
Control panel
7
Table 1-3 DC controller electrical components (continued)
Component type Symbol Description
Switch SW1001 Power switch
SW301 Door-open detection switch
Photointerrupter PS912 Top sensor
PS913 Paper width sensor
PS914 Cassette media out sensor
PS914 Left paper width sensor
PS915 Multipurpose tray media out sensor
PS915 Right paper width sensor
PS916 Fuser output sensor
PS916 Output-bin paper-full sensor
8 Chapter 1 Theory of operation ENWW
Motor control
The product has one motor for media feed and image formation.
Figure 1-6 Main motor
ENWW
Table 1-4 Motor control components
Symbol Name Driving part Failure detection
M1 Main motor Rollers in the product an
rollers in the paper feeder
Yes
Engine control system
9
Fan control
The product has one fan for preventing the product from overheating.
Figure 1-7 Fan control
Table 1-5 Fan control components
Symbol Name Cooling area Type Speed
FM1 Fan Inside the product Intake Full
10 Chapter 1 Theory of operation ENWW
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