2MN/2N1
1-4-82
8430 Punch unit communication
error
Communication failed to be
established after the punch
unit was hooked 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.
Punch PWB (YC1) and DF main PWB (YC7)
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.
Punch PWB (YC1) and DF main PWB (YC8)
Defective PWB. Replace the punch PWB or the DF main
PWB and check for correct operation.
8500 Mailbox communication
error
(4000-sheet finisher)
Communication failed to be
established after the mailbox
was hooked up.
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 main PWB (YC3) and DF main PWB
(YC6)
Defective PWB. Replace the MB main PWB or the DF main
PWB and check for correct operation.
8510 MB conveying motor error 1
(4000-sheet finisher)
When initial operation, MB
home position sensor does
not turn on within 5 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.
Code Contents Causes
Check procedures/
corrective measures
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