Gestetner G060 Service Manual page 131

SC No. Item
SC 461- Thermistor 2 When the temperature
002 error (short detected by the thermistor 2,
circuit) which is at the right (paper
feed section) side of the laser
optics unit, is higher than 70°C
for 10 seconds consecutively,
the BCU determines that the
circuit is shorted and displays
this SC code
Transfer belt The transfer belt HP sensor
SC 471
H.P. error signal does not change from
Low to High (home position) or
vice versa 1 second after the
transfer belt contact motor
turns on.
SC 490 Transfer bias / The high voltage supply board
paper (T/PA/CL) monitors the circuit
attraction roller and detects current leaks. If
bias leak error this happens, the high voltage
supply board sends a SC
signal (High to Low at CN213-
8) to the BCU.
The BCU monitors this signal
every 2 ms and generates this
SC code when the error
condition occurs 250
consecutive times.
SM
Definition Possible Cause
• Thermistor 2
defective
• Cable connection
error
• BCU defect
• Transfer belt unit not
set properly
• Defective transfer belt
H.P. sensor and/or
transfer belt set
sensor
• Defective transfer belt
contact motor
• Transfer belt unit
problem
• Defective high
voltage supply board
(T/PA/CL)
•
Damaged transfer
belt
•
Transfer unit
•
Damaged high
voltage supply cables
•
Damaged cables
between the BCU and
high voltage supply
board
•
Defective BCU
4-17
Related
Troubleshooting Procedure
SCs
1. Turn the main switch off and on.
2. Check the cable connections.
3. Replace the thermistor.
4. Replace the BCU.
1. Turn the main switch off and on.
2. Reset the transfer belt unit.
3. Clean or replace the transfer belt H.P.
sensor and/or transfer belt set sensor.
4. Replace the transfer belt contact
motor.
5. Check the contact and release
mechanism of the transfer belt unit.
1. Turn the main switch off and on.
2. Check the transfer unit and replace
the belt and/or the transfer unit if any
damage is found.
3. Replace the high voltage supply
board (T/PA/CL).
4. Check and/or replace the high voltage
supply cables.
5. Check and/or replace the dc cables
between the BCT and high voltage
supply board.
6. Replace the BCU.
SC TABLE
Type
G060