Ricoh A250 Service Manual page 405

This manual explains the Fax Unit, as well as the following.
Y
EXFUNC board - Fax Function Expander (Machine Code: A892)
Y
Handset (Machine Code: A646)
Y
PCFE board - PC Fax Expander(Machine Code: A894)
Y
ISDN kit (Machine Code: A890) :Europe model only
Y
(EXMEM board – Expansion Memory)
FAX UNIT A891