Xerox PHASER 7500 - Drum CRUM M Communication Fail

Phaser 7500 Printer Service Manual 3-257
Error Messages and Codes
Drum CRUM M Communication Fail
Communication failure with Drum (M) was detected.
Applicable Chain-Link Code
• 091-918: Drum CRUM M Communication Fail
Initial Actions
• Power cycle the printer.
• If the problem persists, follow the procedure below.
1. Turn the power Off and On.
2. Check the following:
• The connection between the Motor Drive PWB J526 and the Drum CRUM
Coupler Assembly (M) P113 for open circuit, short circuit, and poor
contact.
• The connection terminals between the Drum (M) CRUM PWB and the
Drum CRUM Coupler Assembly (M) CRUM for damage and debris.
• The Drum (M) CRUM PWB for contamination or disengagement.
• The Imaging Unit (M) for improper installation.
3. If no problems are found, replace the following parts in sequence:
• Imaging Unit (M) (REP 1.2, page 8-10)
• Drum CRUM Coupler Assembly (M) (PL8.1.3)
• Motor Drive PWB (REP 18.13, page 8-204)
• MCU PWB (REP 18.12, page 8-202)
Troubleshooting Reference
Applicable Parts Wiring and Plug/Jack Map References
■ Drum CRUM Coupler Assy (M),
PL8.1.3
■ Imaging Unit, PL8.1.4
■ MCU PWB, PL18.3.6
■ Motor Drive PWB, PL18.3.7