Ricoh M281 Series Service Manual page 329

4.23.2 CONTROLLER BOARD
Controller Board (MP 501/601)

Keep NVRAMs away from any objects that can cause static electricity. Static electricity
can damage NVRAM data.
1. Remove the controller box. (page 4-128)
2. Disconnect the connector on the controller box [A].
3. Remove the fax unit [A].
SM 4-135
Electrical Components
D255/D256/M281/M282