Sc569-00 Ricoh Guide

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.

Always order the exact fuser assembly for your Ricoh model suffix (e.g., D147 4116 for MP 4055). Cross-reference your printer’s serial number with Ricoh’s parts catalog before purchasing. sc569-00 ricoh