Ricoh M0A0, Service Manual

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6.Troubleshooting
253
SC No. Level Error Name/Error Condition/Major Cause/Solution

Clear the SP: fusing SC.

Check the connector connection.

Replace the fusing (End) thermistor.
SC No. Level Error Name/Error Condition/Major Cause/Solution
SC553-
01
SC553-
02 A 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 250 degrees C or higher for one second.

Failed fusing (end) thermistor
 Clear the SP: fusing SC.
 Replace the fusing (end) thermistor.
SC No. Level Error Name/Error Condition/Major Cause/Solution
SC554-
00 A Fusing (End) thermistor high-temperature detected (hardware)
The hardware high-temperature error sensor flag is detected (250 degrees C or higher).
 Damaged triac (shorted)
 Failed engine control board
 Failed fusing thermopile
 Failed fusing thermistor
 Abnormal fusing control software behavior
 The PWM signal is continuously supplied from the IH inverter (due to a software or
temperature sensor error).

Clear the SP: fusing SC.

Replace the PSU.

Replace the Engine Board.

Replace the fusing thermopile.

Replace the Fusing Unit.
SC No. Level Error Name/Error Condition/Major Cause/Solution
SC557-00 C Zero-crossing frequency exceeded
The number of zero-crossing interrupts exceeds a certain value in 500 ms.
The frequency of the commercial power supply line is unstable or noise occurs.
None