Ricoh how to fix Error code SC670-00, Ricoh MP 2001sp MP 2501sp, functional problem detected.

When error code shows SC670-00, this video shows, how to fix this problem? This is the first step, if not solved, Please follow service manual. (Service Manual) SC670-00 D Engine start up error Case 1 /ENGRDY signal was not asserted when the machine was turned on or returned from energy saver mode. /IPURDY signal was not asserted when the machine was turned on or returned from energy saver mode. EC response was not received within specified time from power on. PC response was not received within specified time from power on. SC response was not received within specified time from power on. Writing to Rapi driver failed (the other party not found through PCI). Case 2 Unexpected down status was detected after /ENGRDY assertion.