Sharp FO-50 Operation Manual page 59

Using FAX Mode
Changing the number of rings
If desired, you can change the number of rings on which the fax
machine answers incoming calls in FAX and FAX/TEL modes. Any
number from 2 to 4 can be selected.
1
Press these keys:
The display will show:
NUMBER OF RINGS
ENTER (2-4) (2)
2
Enter the desired number of rings
(any number from 2 to 4).
The display will show:
TEL/FAX REMOTE #
3
Press the STOP key to return to the
date and time display.
58
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FUNCTION
4
3
Example: 3 rings
STOP