Kyocera FS4100DN

Error Code:

Code: 7900
Description: Drum unit EEPROM error
No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs eight times successively. Mismatch between writing data and reading data occurs eight times successively.
Causes: Defective connector cable or poor contact in the connector. Defective drum unit.
Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum unit and drum connect PWB (YC1) Drum connect PWB and relay-L PWB (YC3) Relay-L PWB and engine PWB (YC15)
Defective drum unit. Replace the drum unit.

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