Ricoh Aficio MP171 Field Service Manual page 131

SC No. Level
SC544-00 A
SC No. Level
SC545-00 A
Error Name/Error Condition/Major Cause/Solution
Fusing (Center) thermopile 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.
Error Name/Error Condition/Major Cause/Solution
Fusing (Center) heater stay ON
The thermistor (center) has not detected the target temperature, even after
the fusing heater stays ON for more than 30 seconds after reloading.
• Deformed or floating thermistor
• Broken fusing lamp wire
• The overtemperature prevention mechanism started working
• Clear the SP: fusing SC.
• Replace the fusing thermistor.
• Replace the fusing (Center) lamp.
Service Call
129