Service manual
SC TABLE
G130/G131 4-34 SM
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 751 Booklet finisher
punch-unit
sensor error 1
The paper edge and size
sensors receive the 2.5-volt
light or weaker light even when
the source emits 4.4-volt light.
• Defective sensors
• Dirty sensors
1. Turn the main switch off and on.
2. Clean the sensors.
3. Replace the sensors.
B
SC 752 Booklet finisher
punch-unit
registration
motor error
• The registration motor drives
the slide unit to the rear side
for 1 second. However, the
home position sensor does
not turn on.
• The registration motor drives
the slide unit to the front side
for 1 second. However, the
home position sensor does
not turn off.
• Incorrect assembly of
the registration motor
• Loose connection of
the registration motor
• Defective home
position sensor
• Loose connection of
the home position
sensor
1. Turn the main switch off and on.
2. Check the connection of the
registration motor.
3. Check the connection of the home
position sensor.
4. Replace the home position sensor.
5. Replace the registration motor.
B
SC 753 Booklet finisher
punch-unit
punch motor
error
• The punch motor starts to
drive the punch cams.
However, the controller does
not receive the encoder-lock
signal for 60 milliseconds.
• The punch motor start to
drive the punch cams.
However, the home
positions sensor does not
turn on for 250 milliseconds.
• Malfunction of the
punch motor
• Loose connection of
the punch motor
• Defective home
position sensor
• Loose connection of
the home position
sensor
• Loose connection of
the encoder sensor
• Defective encoder
sensor
1. Turn the main switch off and on.
2. Check that the connection of the
punch motor.
3. Check the connection of the home
position sensor.
4. Check the connection of the encoder
sensor.
5. Replace the home position sensor.
6. Replace the encoder sensor.
7. Replace the punch motor.
B
SC 754 Booklet finisher
punch-unit
sensor error 2
The A/D inputs of the sensor
are not corrected by varying
the D/A outputs.
• Defective sensor
• Dirty sensor
1. Turn the main switch off and on.
2. Clean the sensors.
3. Replace the sensors.
B