Ricoh M281 Series Service Manual page 837

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Be careful not to damage the hooks at the rear of the controller cover when you
remove or install the controller cover.
5. Insert the Fax Connection Unit Type M24 SD card into SD card slot 1 [A] (upper slot).
6. Reassemble the machine.
7. Turn ON the main power.
8. Press [Firmware Version] in the [Administrator Tools].
SM
Fax Connection Unit Type M24 (D3CP-05, 06, 07)
3 D255/D256 FAX OPTION