Brother S-7200B Service Manual page 68

11. TREADLE UNIT ASSEMBLY
3) Memorizing the neutral position
4) Memorizing the maximum backward position
5) Completion of setting
61
With your foot released from the treadle, press the start
backtack key (4).
"Pr" will appear in the stitch number display (3).
3197M
With the treadle depressed backward to the maximum
backward position, press the start backtack key (4).
The stitch number display (3) will switch off.
3198M
1. Turn off the power switch (1).
2. Set DIP switch No.4 to OFF.
0653B
S-7200B