Kyocera ECOSYS M3550idn

Error Code:

Code: 7900
Description: Drum EEPROM error
No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated 5 times successively. Mismatch of reading data from 2 locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
Causes: DR PWB. Connect left PWB. Control PWB.
Remedy: DR PWB 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. DR PWB and drum connect PWB (YC1) Drum connect PWB and connect left PWB (YC3) Connect left PWB and control PWB (YC2) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Drum unit.
Connect left PWB Replace the connect left PWB.
Control PWB 1. Check the control software and upgrade to the latest, if necessary. 2. Replace the control PWB and check for correct operation.

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