Ricoh — Sc569-00

Non-OEM toner contains low-grade waxes that produce excess dust, fouling the thermistor rapidly. Also, damp paper releases steam that condenses residue on sensors.

: The fuser film, pressure roller, or bearings may be damaged or worn, causing the motor to lock or feel "heavy". Sensor Failure photo interrupter sensor sc569-00 ricoh

The thermistor is a small, glass-encapsulated resistor that changes resistance with temperature. Over time, toner dust and paper dust create an insulating layer on the thermistor. This layer delays temperature readings, confusing the zero-cross detection circuit. Non-OEM toner contains low-grade waxes that produce excess

The error on a Ricoh device is a Service Call (SC) code specifically indicating a Fusing Pressure Release Motor Error . This fault occurs when the machine fails to detect the Home Position (HP) of the pressure roller release mechanism after three consecutive attempts. Common Causes of SC569-00 Sensor Failure photo interrupter sensor The thermistor is