2MN/2N1
1-4-70
7943 Laser scanner unit M
EEPROM error
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.
APC PWB M and LSU relay PWB (YC8)
LSU relay PWB (YC2) and engine PWB
(YC11)
Defective APC
PWB M.
Replace the laser scanner unit (see page 1-
5-17).
7944 Laser scanner unit Y
EEPROM error
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.
APC PWB Y and LSU relay PWB (YC12)
LSU relay PWB (YC2) and engine PWB
(YC11)
Defective APC
PWB Y.
Replace the laser scanner unit (see page 1-
5-17).
8010 Punch motor error 1
When the punch motor is
driven, punch home position
sensor does not turn on within
200 ms.
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 motor and punch PWB (YC4)
Punch home position sensor and punch
PWB (YC8)
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 motor and punch PWB (YC4)
Punch home position sensor and punch
PWB (YC8)
Punch PWB (YC1) and DF main PWB (YC8)
Defective punch
home position sen-
sor.
Replace the punch home position sensor.
Defective punch
motor.
Replace the punch motor.
Defective PWB. Replace the punch PWB or DF main PWB
and check for correct operation.
Code Contents Causes
Check procedures/
corrective measures
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