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SERVICE CALL CONDITIONS
2.12 CODE #53 — FUSING OVERHEAT
- Definition -
The temperature detected by the thermistor becomes higher than 240°C.
- Possible Causes -
•
Thermistor short
Defective ac drive board
•
Defective main board
•
Fusing harness shorted
•
- Action -
Clear the service call condition.
Check the voltage at TP107 on the main board.
More than
Less than
3.45 volts
3.45 volts
Replace the main board.
Has the thermistor shorted?
No
Yes
Replace the thermistor.
Check the voltage at CN114-4 on the main board.
24 volts 0 volts
Replace the main board.
Replace the ac drive board or check the fusing harness.
6-44
24 June 1994
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