Ricoh Da-P1 Field Service Manual page 186

6. Troubleshooting
SC No.
SC553-00
SC No.
SC554-00
SC No.
SC557-00
184
Level Error Name/Error Condition/Major Cause/Solution
Fusing (Edge) thermistor high-temperature detected (software)
While a fusing heater works, temperatures of 255°C or more are
detected during 1 second.
A
Resistor failure: Thermistor (Center)
Clear the SP: fusing SC
Level Error Name/Error Condition/Major Cause/Solution
Fusing (Edge) thermistor high-temperature detected (Hardware)
Temperatures of 257°C or more are detected.
• Damaged triac (shorted)
• Failed engine control board
• Failed fusing thermopile
• Failed fusing thermistor
A
• 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 PSU when triac is blown.
Replace engine board and/or fusing thermistor.
Level Error Name/Error Condition/Major Cause/Solution
Zero-crossing frequency exceeded
The number of zero-crossing interrupts exceeds a certain value in 500
ms.
C
The frequency of the commercial power supply line is unstable or noise
occurs.
None