Ricoh D096 Service Manual page 201

Fusing temperature warm-up error (center)
The fusing temperature
rises less than 7 degrees in
2 seconds, and this
542 A
continues 5 times
consecutively.
The fusing temperature is
not detected in 25 or 35
seconds.
Fusing overheat error (center)
The fusing temperature is
543 A
over 230°C for 1 second
(detected by the
thermistor).
Fusing overheat error (center) 2
The fusing temperature is
over 250°C for 1 second
544 A
(detected by the fusing
temperature monitor
circuit).
Fusing lamp overheat error (center)
After the fusing temperature
reaches the target
545 A
temperature, the fusing
lamp does not turn off for 12
consecutive seconds.
SM Appendix
Service Call Conditions
Fusing thermistor defective or out of
position
Fusing lamp open
Power supply board defective
Fusing thermistor defective
Power supply board defective
Fusing thermistor defective
Power supply board defective
Fusing thermistor defective or out of
position
Power supply board defective
3-7 D096