The controller board itself may have a faulty component or corrupted firmware preventing a proper handshake.
Inspect the connection where the operation panel attaches to the machine. sc673-10 ricoh error
Sometimes a simple "glitch" in the power-up sequence triggers the error. The controller board itself may have a faulty
Turn off the main power switch (located on the side or front of the machine, not just the sleep button). sc673-10 ricoh error
The is a specific communication error indicating a failure between the operation panel and the controller (CTL) . While many Ricoh "SC" codes refer to mechanical jams or fuser issues, the 600-series typically points toward electrical communication or controller startup failures. Understanding the SC673-10 Error