Service Guide
v
Contents
General Information
1
The Phaser 1235 Color Printer 2
Printer RAM and printer capabilities 4
CRU life counter behavior 4
Print engine assemblies 5
The image processor board 11
The control panel 12
On Line LED 12
! Fault 12
Rear panel 13
Accessing special operating modes 14
System controller board LEDs 14
Paper tray type sensing 15
Specifications 16
Regulatory specifications 19
Error Codes and Messages
21
Error messages 21
Troubleshooting
31
Power on self-diagnostic test 32
Print engine troubleshooting 33
Testing the print engine 33
Verifying printer operation by using its self-test print 34
Verifying power supply operation 34
Measuring power supply voltages 34
Inspecting the low-voltage power supply fuse 36
Safety interlocks 36
Testing for a shorted motor 37
Motor and fuser roller resistances 38
Media jams and the paper path 39
Media-based problems 39
Media problems 39
Multiple-sheet pick 39
The media skews passing through the paper path 40
Paper tray indicates it is empty when it is not 40
