2MN/2N1
1-4-68
7904 Drum 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 8 times
successively.
Mismatch between writing
data and reading data occurs
8 times successively.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Drum PWB Y and front PWB (YC14)
Front PWB (YC2) and engine PWB (YC10)
Defective drum
PWB Y.
Replace the drum unit Y (see page 1-5-29).
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 8 times
successively.
Mismatch between writing
data and reading data occurs
8 times successively.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Developer unit K and front PWB (YC9)
Front PWB (YC2) and engine PWB (YC10)
Defective devel-
oper unit K.
Replace the developer unit K (see page 1-5-
29).
7912 Developer unit C 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 8 times
successively.
Mismatch between writing
data and reading data occurs
8 times successively.
Defective connec-
tor cable or poor
contact in the con-
nector.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
Developer unit C and front PWB (YC13)
Front PWB (YC2) and engine PWB (YC10)
Defective devel-
oper unit C.
Replace the developer unit C (see page 1-5-
29).
Code Contents Causes
Check procedures/
corrective measures
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