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January 2000 © TOSHIBA TEC 4 - 19 FC-22 TROUBLESHOOTING
C0B Drum motor K rotation abnormal
C0C Drum motor C rotation abnormal
C0D Drum motor M rotation abnormal
C0E Drum motor Y rotation abnormal
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Before performing the following checks, be sure to place the transfer belt unit in a lowered position;
otherwise, the drums and the transfer belt would be damaged when you rotate the drum motor.
Is the drum motor rotating properly?
1. Check if the drum motor connector CN1 or CN2 is disconnected.
2. Check if the connector J116 on the LGC board is disconnected.
3. Check if the switching power supply connector J711 is disconnected.
4. Check if the harness between the LGC board and the drum motor is open-
circuited.
5. Check if the harness between the switching power supply and the drum mo-
tor is open-circuited.
6. Check for any open-circuited harness or any disconnected connector pin.
7. Rotate the motor manually, counterclockwise as seen from its back, and if
the motor load is abnormal, adjust the load on the drum shaft inside the EPU.
Remove any foreign matter from the drive unit.
(Do not try to rotate the motor clockwise as seen from its back.)
8. Replace the LGC board.
9. Replace the drum motor.
Are the pins (K: 22 pin, C: 28 pin, M: 9 pin, Y: 3 pin) of the connector J116 on the LGC board
always at the level "L", and the LEDs (K: D4, C: D3, M: D2, Y: D1) on the LGC board always lit?
1. Check if the drum motor connector CN2 is disconnected.
2. Check if the connector J116 on the LGC board is disconnected.
3. Check if any conductor pattern on the LGC board is open- or short-circuited.
4. Check if any harness is open-circuited or any connector pin is disconnected.
5. Replace the LGC board.
6. Replace the drum motor.
1. Check if any conductor pattern on the LGC board is open- or short-circuited.
2. Replace the LGC board.
3. Replace the drum motor.
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YES
NO
YES
NO