Kyocera TASKalfa 2550ci - Page 291

2MV
1-4-35
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.
Poor contact in the
connector termi-
nals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Drum unit (M) and drum connect PWB(YC4)
drum connect PWB and engine connect
PWB (YC4)
Engine connect PWB and engine PWB
(YC9)
Defective drum
PWB.
Replace the drum unit M (see 1-5-16).
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-45).
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.
Poor contact in the
connector termi-
nals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Drum unit (Y) and drum connect PWB(YC2)
drum connect PWB and engine connect
PWB (YC4)
Engine connect PWB and engine PWB
(YC9)
Defective drum
PWB.
Replace the drum unit Y (see 1-5-16).
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-45).
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.
Poor contact in the
connector termi-
nals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Developer unit (K) and drum connect
PWB(YC9)
drum connect PWB and engine connect
PWB (YC4)
Engine connect PWB and engine PWB
(YC12)
Defective devel-
oper PWB.
Replace the developer unit K (see 1-5-14).
Defective PWB. Replace the engine PWB check for correct
operation (see page 1-5-45).
Code Contents Causes
Check procedures/
corrective measures