Specifications

2.12 CODE #55 — FUSING THERMISTOR OPEN
- Definition -
The thermistor does not detect 2
o
C within 30 seconds after the main switch is
turned on.
- Possible Causes -
• Thermistor open
• Main board defective
• Fusing lamp open
• Thermofuse open
- Action -
Is the thermistor open?
No Yes
Replace the thermistor.
Clear the service call condition.
Does the fusing lamp turn on?
No Yes
Replace the main board.
Is the fusing lamp open?
No Yes
Replace the fusing lamp.
Is the thermofuse open?
No Yes
Replace the thermofuse.
Is the ac harness defective?
No Yes
Replace the ac harness.
1 December 1990
6-43