Black Print - Xerox DocuPrint C55 Service Manual

Defect Name / Description
7. BLACK PRINT (NO IMAGE IS PRESENT,
THE PAGE IS BLACK).
IMAGE QUALITY RAPs
IMAGE QUALITY DEFECTS
Possible Causes
1. Drum Module not seated.
2. Print Drum module arcing.
The print may be a combination of all colors.
3. ESS holding laser on.
4. No power to Charge Scorotron.
5. No Charge on signal.
6. Broken Charge Scorotron.
7. High voltage Power Supply defective.
8. Constant Black Data being sent to ROS.
9. Constant Black Data being sent to PCU PWB.
10. PCU PWB or ESS PWB defective.
11. Laser beam is always on.
2/99
3-6
Corrective Action
1. Reseat the Drum Module.
2. Listen for arcing and watch message display
for scrambled characters. If present replace
the Print Drum module.
3. Slide ESS out of printer. Run IOT Test
pattern. If OK, replace ESS. If prints are still
black, reinstall ESS and continue with this
procedure.
4. Check the wiring between the High voltage
Power Supply and the Charge Spring Clip to
ensure a good connection.
5. Refer to Section 7, BSD 9.1 and check the
Charge on Signal (CN106-2) for an open. If
signal does not go low during print, replace
the PCU PWB.
6. Replace the Print Drum Module.
7. Replace the High Voltage Power Supply.
8. Refer to Section 7, BSD 6 and check the
VIDEO DATA line (CN113-8) for a short to
ground.
9. Refer to Section 7, BSD 6 and check the
DATA line (CN104-11) for a short to ground.
10. Replace PCU PWB. If problem still exists,
replace the ESS PWB.
11. Replace the ROS.
DocuPrint C55/C55mp/[NC60]