Ricoh G092 Service Manual page 108

SERVICE CALL CONDITIONS
SC Symptom
543 Heating belt overheat
The temperature of the
heating belt is out of the
normal range.
544 Heating belt low temperature error (1)
The fusing unit thermistor in
the middle of the unit has
detected low temperature.
554 Heating roller low temperature error (2)
The fusing unit thermistor at
the left end of the unit has
detected much lower
temperature than the other
fusing unit thermistor does.
580 Fusing belt rotation error
The rotation of the fusing
unit is not normal.
581 Fusing unit low voltage error
The voltage applied to the
fusing unit is out of the
normal range.
G081/G092
Possible Cause/Required Action
• Pin 1 (IC6) unable to turns to lower level
• Defective IH power supply board
• Thermistor short-circuited
• Defective cable connection between CN15 and
thermistor
1. Replace the control board.
2. Replace the IH power supply board.
3. Replace the fusing unit.
4. Connect the cable between CN15 and the
thermistor correctly.
• Defective connection between engine control board
(CN15) and fusing unit
• Defective thermistor
• Defective connection between fusing unit and
thermistor
• Pin 7 (CN32 on engine control board) unable to
send signal
• Defective IH unit or IH power supply board
5. Replace the IH unit or IH power supply board.
6. Connect the cable between the engine board and
fusing unit correctly.
7. Replace the thermistor.
8. Connect the cable between fusing unit and
thermistor correctly.
9. Replace the engine control board.
See SC544.
• Defective fusing belt, gear, or rotation plate
• Defective connection between engine control board
(CN15) and fusing unit
• Defective connection of fusing unit connector
• Pin 4 (CN15) unable to send 1.4-second (or less)
encoder pulse
1. Replace the fusing unit.
2. Connect the cable between the engine control
board (CN15) and fusing unit correctly.
3. Connect the fusing unit connector correctly.
4. Replace the engine control board.
• Defective IH power supply board
• Defective thermostat
1. Replace the IH power supply board.
2. Replace the IH unit.
4-4 SM