Specifications

2.11 CODE #53 — FUSING OVERHEAT
- Definition -
The thermistor detects a temperature higher than 240
o
C.
- Possible Causes -
• Thermistor short
• AC drive board defect
• Main board defect
- Action -
Clear the service call condition.
Check the voltage at TP107 on the main board.
More than Less than
3.45V 3.45V
Replace the main board.
Has the thermistor shorted?
No Yes
Replace the thermistor.
Check the voltage at CN122-9 on the main board.
24V 0V
Replace the main board.
Replace the ac drive board.
1 December 1990
6-42