391-921 Drum CRUM K Not In Position
BSD-ON: 9.4 Drum Life Control (C,K)
The Drum (K) CRUM is not in the proper position (loose CRUM).
NOTE:
When turning the power OFF, turn OFF the Power Switch first and then the Main Power Switch.
Cause/Action
1.Remove and reinstall the Drum (K).
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 MDM PWB P/J528 and the Drum CRUM Coupler Assembly (K) P/J115 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 foreign substances
•The Drum (K) for improper installation
If no problems are found, replace the following parts in sequence:
•Drum (K) (PL 8.1)
•Drum CRUM Coupler Assembly (K) (PL 8.1)
•MDM PWB (7830/35) (PL 18.2A)
•MDM PWB (7845/55) (PL 18.2B)