Hi jimsal,

Welcome to Fixya. Yes Diagnosis is correct because SC670 is a common error on this machine.

SC670 mistake Engine Response - After powering on the machine, a response is not received from the engine within 30 second. Which means when the main power is turned on or the machine starts warming up from energy-saving mode, the controller does not receive a command signal from the BCU. There could be few possibilities that you need to check and diagnose

Reasons:

- Loose connection
- Defective controller
- Defective BCU

Troubleshooting:

- Turn the main switch off and on.
- Check the connection between the BCU and controller.
- Replace the controller.
- Replace the BCU.

Here's the illustration of the controller:

To reinstall the controller board into the printer push the bottom center area of the board

After replacing the BCU or controller, remove the NVRAM on the old board and put it on the new one.
This should be the series of troubleshooting. Unfortunately, this is not an easy fix. If you do not have any repair experience, i would advise you to call a Ricoh professional so that he could take care of the problem.

Thanks for using Fixya.

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http://www.fixya.com/support/t1718617-ricoh_1515mf_scanning

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