Ricoh D065 Service Manual page 473

Service Call Conditions
the frequency measured by
the number of zero cross
signals for 500 ms is larger
than 66Hz or smaller than 45
Hz.
The interval between one
zero cross signal and the
next is 7.5 ms or shorter 3
times consecutively for 500
ms.
Fusing thermistor error 1
The end thermistor (contact type)
551 A
was less than 0C (32F) for more
than 7 seconds.
Fusing thermistor error 2
The end thermistor (contact type)
could not detect:
100°C 25 seconds after the
start of the warmup cycle.
A change in temperature
552 A
more than than 16 degrees
for 5 seconds.
The reload temperature with
56 seconds after the start of
the fusing temperature
control cycle.
Fusing thermistor error 3
553 A
The end thermistor (contact type)
was at 240°C (464°F) for more
D062/D063/D065/D066
Thermistor disconnected
Thermistor connector defective
Fusing lamp disconnected
Thermistor bent, damaged
Thermistor position incorrect
PSU defective
IOB control board defective
3-28 SM Appendix