Ricoh M001 Service Manual page 85

Fusing overheat error – software
The fusing temperature was detected
543 A
higher than 235
ms.
High temperature detection: Hard
544 A
The thermister detects a high
temperature signal.
Fusing lamp remains on
The fusing lamp remained on longer
545 A
than 12 sec. after the fusing unit
reached optimum temperature and the
main motor switched off.
Unstable fusing temperature
During standby, the fusing temperature
went below 60 °C twice or went above
60 °C three times within 500 ms.
546 A
A 60°C increase in fusing temperature
was detected at five 1-sec. intervals
within 60 sec. before reaching fusing
temperature.
SM
o
C for longer than 200
4-5
Service Call Conditions
Fusing thermistor defective
Power supply board defective
Defective thermister
Defective fusing unit, PSU,
engine board
Fusing thermistor defective
Power supply board defective
Defective connection of the
fusing unit
Fusing thermistor defective
Power supply board defective
Defective connection of the
fusing unit
M001