Damaged harnesses or loose connectors between the motor/sensor and the control board. How to Fix and Reset SC569-00
The pressure release motor may be locked due to an excessive load, or the motor driver itself could be defective. sc569-00 ricoh
Before performing a software reset, inspect the following according to YYToner : sc569-00 ricoh
Dust or toner buildup on the "U-shaped" HP sensor can prevent it from detecting the actuator. sc569-00 ricoh
Because fusing-related errors are often flagged for safety, they frequently require a manual software reset even after the physical problem is resolved. 1. Hardware Inspection
The pressure roller HP sensor (often designated as S26 or SEN60) may be disconnected, dirty, or defective.