Service manual

30 July, 2001 SC TABLE
4-17
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 461-
002
Thermistor 2
error (short
circuit)
When the temperature
detected by the thermistor 2,
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
• Thermistor 2
defective
• Cable connection
error
• BCU defect
1. Turn the main switch off and on.
2. Check the cable connections.
3. Replace the thermistor.
4. Replace the BCU.
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 properly
• Defective transfer belt
H.P. sensor and/or
transfer belt set
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 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.
SC 490
Transfer bias /
paper
attraction roller
bias leak error
The high voltage supply board
(T/PA/CL) monitors the circuit
and detects current leaks. If
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.
• 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
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.