Service manual

SC TABLE
SM 4-33 G130/G131
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 747 Booklet finisher
lift motor error
The upper limit sensor
detects the regular tray while
the lift motor is lifting the
regular tray.
The paper height sensor
does not turn off within 10
seconds after the lift motor
starts to lower the regular
tray.
The upper limit sensor does
not turn off within 10
seconds after the lift motor
starts to lower the regular
tray.
The paper height sensor
does not turn on within 10
seconds after the lift motor
starts to lift the regular tray.
The controller does not
receive the signal from the
lift motor encoder sensor
within 50 milliseconds after
the lift motor starts.
Defective paper height
sensor
Loose connection of
the paper height
sensor
Defective upper limit
sensor
Loose connection of
the upper limit sensor
Defective lift motor
Loose connection of
the lift motor
Incorrect assembling of
the lift motor
Defective lift motor
encoder sensor
Loose connection of
the lift motor encoder
sensor
1. Turn the main switch off and on.
2. Check the connection of the paper
height sensor.
3. Check the connection of the upper
limit sensor.
4. Check the connection of the lift motor
encoder sensor.
5. Check the connection of the lift
motor.
6. Replace the paper height sensor.
7. Replace the upper limit sensor.
8. Replace the lift motor encoder
sensor.
9. Replace the lift motor.
B
SC 748 Booklet finisher
backup data
error
The CPU tries to write data in
the EEPROM three times, but
fails to write data.
Defective EEPROM
EEPROM not installed
1. Turn the main switch off and on.
2. Check that the EEPROM is installed.
3. Replace the EEPROM.
B
SC 749 Booklet finisher
punch-unit
communication
error
A communication-error alarm is
not cleared for 3 seconds.
The finisher controller
cannot communicate
with the punch-unit
controller.
1. Turn the main switch off and on.
2. Check the connection between the
finisher controller and the punch-unit
controller.
B
SC 750 Booklet finisher
punch-unit
controller error
The checksum in the backup
data is inconsistent.
Defective EEPROM
(on the punch-unit
controller)
EEPROM not installed
1. Turn the main switch off and on.
2. Check that the EEPROM is installed.
3. Replace the EEPROM.
B