2KZ/2K0
1-4-34
7912 Developing 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 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 (C) and drum connect
PWB(YC7)
drum connect PWB and engine connect
PWB (YC4)
Engine connect PWB and engine PWB
(YC12)
Defective develop-
ing PWB.
Replace the developer unit C (see 1-5-14).
7913 Developing 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.
Developer unit (M) and drum connect
PWB(YC8)
drum connect PWB and engine connect
PWB (YC4)
Engine connect PWB and engine PWB
(YC12)
Defective develop-
ing PWB.
Replace the developer unit M (see 1-5-14).
7914 Developing 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.
Developer unit (Y) and drum connect
PWB(YC6)
drum connect PWB and engine connect
PWB (YC4)
Engine connect PWB and engine PWB
(YC12)
Defective develop-
ing PWB.
Replace the developer unit Y (see 1-5-14).
Code Contents Causes
Check procedures/
corrective measures
Service Manual Y113010-4
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