Sc569-00 Ricoh ❲INSTANT❳

Understanding the root cause saves you from replacing expensive parts unnecessarily. Here are the top reasons this error occurs:

| Priority | Cause | Explanation | |----------|-------|-------------| | 1 | Paper debris / staples | Tiny paper pieces or a loose staple lodged near the alignment fence guide rails. | | 2 | Alignment fence mechanical binding | Fence skewed, rail dirty/warped, or spring detached. | | 3 | Home position sensor failure | Sensor dirty, disconnected, or failed (e.g., photo-interrupter stuck ON/OFF). | | 4 | Alignment fence motor failure | Motor not turning (open winding, broken gear, harness fault). | | 5 | Motor drive circuit / harness | Broken wire between finisher controller board and motor/sensor. | | 6 | Finisher main board failure | Rare; typically last resort. |

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.

Ricoh fusers include a non-volatile memory (NVRAM) chip. After replacing the fuser, run:

Failure to do this may cause the printer to falsely re-trigger SC569-00 because the old fuser’s error log remains in memory.

In Ricoh’s proprietary Service Call (SC) code system, numbers are categorized by the component family. Codes in the 500 range specifically refer to issues with the fusing unit (also known as the fuser or fixing assembly).

SC569-00 translates to: "Fusing Thermistor Edge Malfunction (Center) – Zero Cross Error."

To break that down:

In practical terms: The printer’s main board sent power to the fuser lamp to heat up, but the thermistor reported a rate of temperature change or an absolute temperature that was physically impossible or dangerous. The printer shut down to prevent a fire hazard.