Service manual

SC TABLE
SM 4-19 G130/G131
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 471 Transfer belt
H.P. error
The transfer belt HP sensor
signal does not change from
Low to High (home position) or
vice-versa 1 second after the
transfer belt contact motor
turns on.
• Transfer belt unit not
set correctly
• Defective transfer belt
H.P. sensor and/or
transfer belt sensor
• Defective transfer belt
contact motor
• Transfer belt unit
problem
1. Turn the main switch off and on.
2. Reset the transfer belt unit.
3. Clean or replace the transfer belt
sensor.
4. Replace the transfer belt contact
motor.
5. Check the contact and release
mechanism of the transfer belt unit.
D
SC 481 Waste toner
vibrator error
The waste toner vibrator does
not operate.
• Loose connector
• Defective motor
1. Turn the main switch off and on.
2. Replace the motor.
D
SC 490 Transfer bias /
paper attraction
roller bias leak
error
• The high voltage supply
board transfer checks the
circuit and detects current
leaks. If this happens, the
high voltage supply board
sends a SC signal (High to
Low at CN215-6) to the
BCU.
• The BCU checks this signal
every 2 ms and generates
this SC code when the error
condition occurs 250
consecutive times.
• Defective high voltage
supply board - Transfer
• Damaged transfer belt
• Transfer unit
• Damaged high voltage
supply cables
• Damaged cables
between the BCU and
high voltage supply
board
• Defective BCU
1. Turn the main switch off and on.
2. Check the transfer unit and replace
the belt and/or the transfer unit if it is
damaged.
3. Replace the high voltage supply
board - Transfer.
4. Check and/or replace the high
voltage supply cables.
5. Check and/or replace the dc cables
between the BCU and high voltage
supply board.
6. Replace the BCU.
D
SC 501 Paper Tray 1
error
SC 502 Paper Tray 2
error
When the tray lift motor is
turned on, (if the upper limit is
not detected within 10
seconds), the machine asks
the user to reset the tray. If this
condition occurs three
consecutive times, the SC is
generated.
• Defective paper lift
sensor
• Defective tray lift motor
• Defective bottom plate
lift mechanism
1. Turn the main switch off and on.
2. Check if the bottom plate smoothly
moves up and down manually.
3. Check and/or replace the paper lift
sensor.
4. Check and/or replace the tray lift
motor.
B