Gestetner B147 Service Manual page 224

SC TABLE
SC No. Item
SC TD sensor error The development-unit drive
393- during warming starts. TD sensor signal is 0.78
001 up V or less.
393-001: K
393-002: Y
393-003: C
393-004: M
SC Drum motor No drum gear position sensor
440- error signal is detected within 0.7
001 440-001: Black second (185 mm/s), 1.0
440-002: Color second (125 mm/s), or 2.0
seconds (62.5 mm/s).
SC Thermistor 1 When the temperature
460- error (open detected by thermistor 1,
001 circuit) which is at the left (fusing unit)
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.
SC Thermistor 1 When the temperature
460- error (short detected by the thermistor 1,
002 circuit) which is at the left (fusing unit)
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
B147/B149/B190
Definition Possible Cause
• Loose cable
connection
• Positioning plate out
of place
• Defective TD sensor
• Development unit not
found
• Defective PCU
• Defective drum motor
• Defective drum gear
position sensor
• Thermistor 1
defective
• Cable connection
error
• BCU defect
• Thermistor 1
defective
• Cable connection
error
• BCU defect
Related
Troubleshooting Procedure
SCs
1. Turn the main switch off and on.
2. Check that the development unit is
correctly installed.
3. Remove the development unit and
check the connector on the rear.
4. Check the positioning plate.
5. Replace the development unit.
1. Turn the main switch off and on.
2. Check and/or replace the PCU.
3. Check and/or replace the sensor.
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. Check the cable connections.
3. Replace the thermistor.
4. Replace the BCU.
4-22
Type
D
D
D
D
SM