Ricoh — Sc569-00

Use SP5804 (Output Check) to activate alignment fence motor.

The SC triggers when:

Two sub-cases:

Even with a current SC569-00, you can access service history:

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Paper dust, toner residue, or melted adhesive from envelope printing can coat the thermistor. A contaminated thermistor acts as an insulator, delaying temperature sensing. The fuser lamp overheats while the sensor reads “cold,” triggering a zero-cross error. Use SP5804 (Output Check) to activate alignment fence

The halogen lamp inside the fuser may have a broken filament or intermittent connection. When the lamp fails, the thermistor detects no temperature rise, but the power circuit still attempts to send current—creating a mismatch that triggers SC569-00.