Service Guide
vii
Contents
General Information 1
The Phaser 740 Color Printer 2
The Phaser 750 Color Printer 4
Phaser 740 printer RAM and printer capabilities 6
Phaser 750 printer RAM and printer capabilities 8
Print engine assemblies 10
The image processor board 13
Phaser 740 13
Phaser 750 14
Front panel 15
Rear panel 17
Test print button 17
Network card LEDs 18
Health LED (Phaser 740 only) 20
Media tray type sensing 20
Difference between Phaser 740 and 750 22
Specifications 23
Regulatory specifications 26
Error Codes and Messages 27
Error messages 27
Print engine error codes 27
Normal power-up self-tests 35
Troubleshooting 37
System power-up sequence 37
Print engine troubleshooting 38
Testing the print engine 38
Verifying printer operation by using its self-test print 39
Verifying power supply operation 39
Measuring power supply voltages 39
Inspecting the power supply fuses 41
Safety interlocks 41
Testing for a shorted motor 42
Media jams and the paper path 43
Media-based problems 43
Media problems 43
Multiple-sheet pick 44
The media skews passing through the paper path 44
Paper tray indicates empty when it is not 44
No paper feeder installed 45
No imaging unit installed 45
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General