Ricoh IM C300 Service Manual page 1599

5.4 FAX UNIT CONFIGURATION
Component
FCU (PCB2)
Speaker
Fax Connection Unit Type M41
D0CK
Code Callout
1
D0CK02 2
D0CK -
124
Remarks
Included with the fax unit
Optional
This is used to set up the remote fax function.
Fax Unit Configuration
SM