Sc569-00 Ricoh [extra Quality] -

The thermistor connects to the printer’s I/O board via a thin wire harness. If this cable is pinched, frayed, or partially unseated from the fuser connector, resistance changes cause false edge-temperature readings.

If you own any of these devices and see the red “Service Call” prompt with SC569-00, do not reset the main breaker repeatedly—this can damage the power supply unit. sc569-00 ricoh