Phaser 7500 Printer Service Manual 3-259
Error Messages and Codes
Drum CRUM K Not In Position
The Drum K CRUM is not in the proper position. (Loose CRUM)
Applicable Chain-Link Code
• 091-921: Drum CRUM K Not In Position
Initial Actions
• Power cycle the printer.
• If the problem persists, follow the procedure below.
1. Remove and reinstall the Imaging Unit (K) (REP 1.2, page 8-10).
2. Polish the connection terminals between the Drum (K) CRUM PWB and the
Drum CRUM Coupler Assembly (K) CRUM with dry cloth. (When cleaning, do
not use drum cleaner, etc.)
3. Check the following:
• The connection between the Motor Drive PWB J526 and the Drum CRUM
Coupler Assembly (K) P115 for open circuit, short circuit, and poor contact.
• The connection terminals between the Drum (K) CRUM PWB and the
Drum CRUM Coupler Assembly (K) CRUM for damage and debris.
• The Imaging Unit (K) for improper installation.
4. If no problems are found, replace the following parts in sequence:
• Imaging Unit (K) (REP 1.2, page 8-10)
• Drum CRUM Coupler Assembly (K) (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 (K),
PL8.1.3
■ Imaging Unit, PL8.1.4
■ MCU PWB, PL 18.3.6
■ Motor Drive PWB, PL18.3.7
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