Service manual

Service Manual vii
Paper path in operation 5-9
Paper pick-up 5-9
Drum loading 5-11
Printing 5-12
Print unloading 5-14
Power supply 5-15
DECcolorwriter 1000 image processor 5-17
Image rendering technology 5-17
6 Troubleshooting
System power-up sequence 6-1
Print engine troubleshooting 6-2
Verifying image processor operation by using the Test Pattern Generator 6-2
Verifying print engine operation by using its self-test print 6-3
Verifying power supply operation 6-3
Measuring power supply voltages 6-3
Inspecting the power supply fuses 6-5
Testing for a shorted motor 6-6
+24 VDC safety interlocks 6-6
Testing motor resistances 6-8
Media jams and the paper path 6-8
Media-based problems 6-8
Paper-pick errors 6-9
Paper-clamping errors 6-10
Print-eject jams 6-11
Checking the paper-feed motor and drive train 6-11
Media skews passing through the paper path 6-12
Transfer roll jam 6-12
Printing and print quality problems 6-13
Streaks or lines in the print parallel to the long axis of printing 6-13
Streaks or lines in the print parallel to the short axis of printing 6-13
White portion of print is colored 6-14
Color is uneven 6-14
Not printing 6-15
Printing too light or too dark 6-16
Image is offset or cut off 6-16
Wrinkling 6-17