To translate: The printer’s central processing unit (CPU) monitors the AC power supply to the fusing lamp. The "zero cross" refers to the point where the AC voltage waveform crosses zero volts. When the fusing thermistor (a temperature sensor) fails to detect the correct zero cross signal or detects an abnormal frequency, the printer instantly halts operation and displays SC569-00.
: Inspect the fuser unit for physical damage or paper jams. Ensure the fuser is properly seated and all connectors are clean. Sensor Replacement
For exact connector pinouts, motor resistance values, and SP mode numbers, always consult the official Ricoh service manual for your specific model, as finisher hardware varies by generation.
Before attempting a software reset, perform a physical inspection of the hardware:
The "piece" or component most likely failing is one of the following: