Ricoh M160 - Page 263

Service Call
SM 6-19 M160/M161
Troubleshooting
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.
 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