Brother S-7300A-403P - Troubleshooting Advanced Stitch Issues; Thread Pulling Out After Trimming; Condensed Stitch and T;T Short Issues

S-7300A
14. TROUBLESHOOTING
94
Problem
Possible cause
Page
15
Upper thread is raised
above the material surface
after thread trimming.
・
Upper thread protrudes from the material surface after thread
trimming.
1. Increase the pitch during thread trimming.
2. Set the feed direction for sewing end processing to ↑.
35*
16
When T/T short is on,
skipped stitches occur
where they should be
sewn at the sewing end.
・
Use the T/T short parameters to delete the the stitch before the final
stitch.
・ Use the T/T short parameters to reduce the stitch pitch of
the final
stitch and the one before it.
・
Use the T/T short parameters to set the feed direction for sewing end
processing to ↑.
If sewing backtack stitches
・ Reduce the number of stitches (D) for backtack sewing by 1 stitch
35*
(94-15)
30*
17
When T/T short is on,
condense stitches (the
final stitch and the one
before it) cannot be sewn
neatly before thread
trimming.
・
Use the T/T short parameters to increase the stitch pitch.
・ Use the T/T short parameters to reduce the sewing speed.
35*
(94-15)
18
Thread trailing length on
underside of material is
too long.
・
Turn on the T/T short function.
If you would like the trailing length to be even sorter after turning on the
T/T short function.
・ Is the meshing position of the thread trimming knives directly below
the needle hole?
・
Use the T/T short parameters to reduce the stitch pitch of the
condense stitches (the final stitch and the one before it) before
thread trimming.
・ Use the T/T short parameters to reduce the pitch during thread
trimming.
35*
82*
35*
(94-15)
19
When T/T short is on,
thread trailing length on
underside of material is
too short.
・
Use the T/T short parameters to increase the pitch during thread
trimming.
35*
(94-15)
20
To prevent fraying at the
sewing end
・
Turn on the T/T short function, and then use the T/T short parameters
to set the feed direction for sewing end processing to ↑.
35*
(94-15)
21
Incorrect thread trimming
(Upper and lower threads
are both not being
trimmed)
・
Is the fixed knife or movable knife damaged or worn?
Replace the fixed knife or the movable knife.
・
Is there not enough of a meshing amount between the upper knife
and the lower knife?
Adjust the tip of the upper knife to the lower knife index position
so that the knives mesh.
82*
Stitch pitch and sewing speed for
stitch before final stitch
Stitch pitch and sewing
speed for final stitch
Stitch pitch during thread trimming
Feed direction for sewing
end processing