Ricoh M160 Service Manual page 262

Service Call
SC No. Level
SC551-00 A
SC No. Level
SC553-01
A
SC553-02
M160/M161
Error Name/Error Condition/Major Cause/Solution
Broken fusing (End) thermistor wire
At least ten times, the temperature is detected to stay at -20 deg
C or less for 5 seconds.

Broken thermistor wire

Bad connector contact

Clear the SP: fusing SC.

Check the connector connection.

Replace the fusing (End) thermistor.
Error Name/Error Condition/Major Cause/Solution
Fusing (End) thermistor high-temperature detected (software)
(553-01)
In a condition of 235 degrees C or higher temperature, the
temperature has increased more than 10 degrees C per 1
second, the heater has continuously reached 100% (maximum)
duty, and the center thermistor has detected the failure to reach
the target temperature by 11 degrees C.
(553-02)
The temperature is detected to stay at 245 deg C or higher for
one second.

Shorted triac

Failed Engine Board

Clear the SP: fusing SC.

Replace the PSU.

Replace the Engine Board.
6-18 SM