If Steps 1 through 4 fail to resolve the issue, the Main Controller Board (MCU/BICU) is defective and requires replacement. The CPU or the board circuitry has failed.
Loose RAM or a failing NVRAM chip on the controller board can stall the boot process. Locate the controller board at the back of the MFP. Remove and firmly reseat the RAM modules. sc67310 ricoh error extra quality
Did this error happen , or right after a firmware update/parts replacement ? If Steps 1 through 4 fail to resolve