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ERROR CODE and TROUBLESHOOTING
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6.2.21 Copy process related service call
[C021] Developer unit motor-YMC locking error
(1) Pull out the EPU tray and perform the output check (03-113) to check if the 3 outputs of the YMC-
developer sleeve and 3 outputs of the drum cleaner auger are rotating normally.
When it is not rotating
(2) Check if the connector of the YMC-developer unit motor is connected securely.
(3) Check if the harness or connector of the drum motor (K)/(YMC) is disconnected or open-
circuited.
(4) Check if the YMC-developer unit motor is abnormal.
(5) Check if the column of the drive gears has any abnormality such as damage.
When it is rotating
(6) Check if waste toner is clogged on the waste toner transport path of the YMC-drum cleaner.
(7) Check if the developer material is excessively supplied to each YMC-developer unit.
(8) Check if the drive gear array of each YMC-developer unit has any abnormality such as breakage.
[C022] Developer unit mixer motor-YMC locking error
(1) Pull out the EPU tray and perform the output check (03-115) to check if the 3 outputs of the YMC-
developer unit mixer are rotating normally.
When it is not rotating
(2) Is the connector of the YMC-developer unit mixer motor connected securely?
(3) Check if the harness or connector of the YMC-drum motor is disconnected or open-circuited.
(4) Check if the YMC-developer unit mixer motor is abnormal.
(5) Check if the drive gear array has any abnormality such as breakage.
When it is rotating
(6) Check if developer material is excessively supplied to each YMC-developer unit.
(7) Check if the drive gear array of each YMC-developer unit has any abnormality such as breakage.
[C023] Developer unit motor-K locking error
(1) Pull out the EPU tray and perform the output check (03-113) to check if the 3 outputs of the K-
developer sleeve and 3 outputs of the drum cleaner auger are rotating normally.
When it is not rotating
(2) Is the connector of the K-developer unit motor connected securely?
(3) Check if the connector of the K-developer motor is disconnected or the harnesses are open
circuited.
(4) Check if the K-developer unit motor is abnormal.
(5) Check if the drive gear array has any abnormality such as breakage.
When it is rotating
(6) Check if waste toner is clogged on the waste toner transport path of the K-drum cleaner.
(7) Check if the developer material is excessively supplied to the K-developer unit.
(8) Check if the drive gear array of the K-developer unit has any abnormality such as breakage.
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