Sharp FO-50 Operation Manual page 73

Optional A.M. Mode Settings
Fax when Answering machine Fails
When this function is turned on, your fax will answer the call after 5
rings if the answering machine for some reason fails to answer before
that time. This ensures that you will receive fax messages even if the
answering machine's tape fills up or the answering machine is not
turned on.
This function has been turned off at the factory. If you want to turn it
on, follow the steps below:
Note: When this function is turned on, make sure that the answering
machine is set to answer on 4 rings or less. If it isn't, the fax will always
answer first, preventing callers from leaving voice messages.
1
Press these keys:
The display will show:
FAX RX A.M. FAILS
2
Press 1 to turn on the function, or 2 to
turn it off.
3
Press the STOP key to return to the
date and time display.
72
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FUNCTION
4
YES
1
NO
or
2
STOP