Kyocera TASKalfa 2551ci Service Manual page 355

Code Contents
7903 Drum unit M 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.
7904 Drum unit Y 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.
7911 Developer unit K 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
Poor contact in the Reinsert the connector. Also check for conti-
connector termi- nuity within the connector cable. If none,
nals. replace the cable.
Drum unit (M) and drum connect PWB(YC4)
drum connect PWB and engine connect
PWB (YC8)
Engine connect PWB and engine PWB
(YC4)
Defective drum Replace the drum unit M (see 1-5-15).
PWB.
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-39).
Poor contact in the Reinsert the connector. Also check for conti-
connector termi- nuity within the connector cable. If none,
nals. replace the cable.
Drum unit (Y) and drum connect PWB(YC2)
drum connect PWB and engine connect
PWB (YC8)
Engine connect PWB and engine PWB
(YC4)
Defective drum Replace the drum unit Y (see 1-5-15).
PWB.
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-39).
Poor contact in the Reinsert the connector. Also check for conti-
connector termi- nuity within the connector cable. If none,
nals. replace the cable.
Developer unit (K) and drum connect
PWB(YC9)
drum connect PWB and engine connect
PWB (YC8)
Engine connect PWB and engine PWB
(YC4)
Defective devel- Replace the developer unit K (see 1-5-13).
oper PWB.
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-39).
1-4-48
Check procedures/
corrective measures
2NP