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January 2000 © TOSHIBA TEC 4 - 17 FC-22 TROUBLESHOOTING
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C09 Black developer motor rotation abnormal
Is the black developer motor rotating properly?
1. Check if the connectors CN1 or CN2 of the black developer motor is discon-
nected.
2. Check if the connector J108 on the LGC board is disconnected.
3. Check if the connector J703 of the switching power supply is disconnected.
4. Check if the harness between the LGC board and the black developer motor
is open-circuited.
5. Check if the harness between the switching power supply and the black de-
veloper motor is open-circuited.
6. Check if any harness is open-circuited or any connector pin is disconnected.
7. Rotate the motor manually, counterclockwise as seen from its back, and if
the motor load is abnormal, remove any foreign matter from the drive unit.
(Do not try to rotate the motor clockwise as seen from its back.)
8. Replace the black developer motor.
9. Replace the LGC board.
Are the pins B12 and B15 of the connector J108 on the LGC board always at the level "L"?
1. Check if the connector CN2 of the black developer motor is disconnected.
2. Check if the connector J108 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 black developer motor.
1. Check if any conductor pattern on the LGC board is open- or short-circuited.
2. Replace the LGC board.
3. Replace the black developer motor.
NO
NO
YES
YES