2MN/2N1
1-4-83
8520 MB conveying motor error 2
(4000-sheet finisher)
When standby operation, MB
home position sensor does
not turn off within 1 s.
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.
MB conveying motor and MB main PWB
(YC5)
MB home position sensor and MB main
PWB (YC2)
Defective MB
home position sen-
sor.
Replace the MB home position sensor.
Defective MB con-
veying motor.
Replace the MB conveying motor.
Defective MB main
PWB.
Replace the MB main PWB and check for
correct operation.
8800 Document finisher main
program error
Document finisher main pro-
gram error at power up.
Defective connec-
tor cable or poor
contact in the con-
nector (4000-sheet
finisher).
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
DF main PWB (YC4) and engine PWB
(YC18)
Defective connec-
tor cable or poor
contact in the con-
nector (1000-sheet
finisher).
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
DF main PWB (YC7) and engine PWB
(YC18)
Defective PWB. Replace the DF main PWB or the engine
PWB and check for correct operation.
8900 Document finisher backup
error
Read and write data does not
match 3 times in succession.
Defective connec-
tor cable or poor
contact in the con-
nector (4000-sheet
finisher).
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
DF main PWB (YC4) and engine PWB
(YC18)
Defective connec-
tor cable or poor
contact in the con-
nector (1000-sheet
finisher).
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
replace the cable.
DF main PWB (YC7) and engine PWB
(YC18)
Improper installa-
tion EEPROM.
Check the installation of the EEPROM and
remedy if necessary.
Defective DF main
PWB.
Replace the DF main PWB and check for
correct operation.
Code Contents Causes
Check procedures/
corrective measures
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