Brother XM3700 Service Manual page 186

Adjustment
<From previous page>
10. Loosen the nut 4 on the adjusting screw of the connecting rod assy.
*Key point
• Do not loosen the nut 4 too much. (When the nut 4 is loosened too much, the adjusting screw is removed.)
11. Adjust the stitch length so that the forward stitch length (10 pitches) and the reverse stitch length (10 pitches)
are the same by turning the adjusting screw of the connecting rod assy.
*Key point
• Turn the adjusting screw counterclockwise (Turn to the direction "a"). (Connecting rod assy is shorter.)
→ Reverse stitch length " f " is shorter. (Fig. 3 "a")
• Turn the adjusting screw clockwise (Turn to the direction "b"). (Connecting rod assy is longer.)
→ Reverse stitch length " f " is longer. (Fig. 3 "b")
12. Tighten the nut 4 on the adjusting screw of the connecting rod assy to secure the adjusting screw.
*Key point
• When tightening the nut 4 of the adjusting screw, keep the adjusting screw from moving.
NG
more than 4 mm
10
pitches
Forward stitch
Straight forward/Straight reverse stitch length
Connecting rod assy
Adjusting screw
10
f
pitches
Reverse stitch
OK
10
pitches
Forward stitch
Fig. 3
4 - 33
Nut 4
Flat screwdriver
NG
more than 4 mm
10
pitches
10
f
pitches
Forward stitch Reverse stitch
Reverse stitch