Gestetner B147, Service Manual

Page: 225 / 1081

SC TABLE
SM 4-23 B147/B149/B190
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC
461-
001 Thermistor 2
error (open
circuit) When the temperature
detected by the thermistor 2,
which is at the right (paper
feed section) side of the laser
optics unit, is less than -30°C
for 10 seconds consecutively,
the BCU determines that the
circuit is opened 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. D
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. D
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 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