2NL/2P8-1
1-4-62
8520 MB conveying motor error 2
(3000-sheet finisher)
When standby operation, MB
home position sensor does
not turn off within 1 s.
MB conveying
motor
1. Execute Mail Box - Conv of U240
finisher operation check (see page 1-3-
90).
2. Manipulate the conveying roller of the
mailbox to check it can smoothly rotate.
3. Check that the drive from the motor
reaches the conveying roller.
4. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
MB conveying motor and MB main
PWB (YC5)
5. If the wiring is disconnected, shorted or
grounded, replace the wiring.
6. Replace the MB conveying motor.
MB home position
sensor
1. Execute U241 Mail Box - Motor HP to
check the finisher switch (see page 1-3-
92).
2. Check that the sensor and its mounting
bracket are correctly positioned.
3. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
MB home position sensor and MB main
PWB (YC2)
4. Replace the MB home position sensor.
MB main PWB Replace the MB main PWB
8800 Document finisher main
program error
Document finisher main pro-
gram error at power up.
DF main PWB
1. Confirm that the wiring connector is
firmly connected and, if necessary,
connect the connector all the way in.
DF main PWB (YC4) and Engine PWB
(YC18) (3000-sheet finisher)
DF main PWB (YC7) and Engine PWB
(YC18) (1000-sheet finisher)
2. If the wiring is disconnected, shorted or
grounded, replace the wiring.
3. Replace the DF main PWB(Refer to the
service manual for the document
finisher).
Engine PWB
1. Check the engine software and upgrade
to the latest, if necessary.
2. Replace the engine PWB (see page 1-5-
44).
Code Contents Related parts
Check procedures/
corrective measures
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