Owner's Manual

14. Troubleshooting
56
BAS-343E
Shuttle race thread
guide position
Fixed knife blade
Shuttle race thread
guide position
Needle bar lift amount
Skipped stitches at
sewing end
Needle bar lift amount
Thread take up spring
tension and height
Check RemedyProblem Cause
Fixed knife is blunt.
Movable knife does
not pick up the thread..
Thread take-up spring
tension and height are
incorrect.
The movable knife does not pick
up the thread because of skipped
stitches at the sewing end.
Movalbe knife position
is incorrect.
Incorrect needle and
rotary hook timing.
Shuttle race thread
guide is not separating
the threads.
13
32
33
32
33
Sharpen or replace the
fixed knife.
Adjust the needle bar
lift amount
Adjust the tension and
height of the thread take-
up spring.
Adjust the position of
the shuttle race thread
guide.
Adjust the needle bar
lift amount.
Refer to "Skipped
stitches occur".
Adjust the position of
the shuttle race thread
guide.
Page
Upper thread is not
trimmed.
Thread jamming.
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Upper thread length
Upper thread tension
Shuttle race thread
guide position
Upper thread is not
properly tight.
Shuttle race thread
guide is not separating
the therads. incorrect.
Uneven upper thread
length.
33
13
12
Adjust the upper
thread tension.
Adjust the position of
the shuttle race thread
gudie.
Adjust the sub-tension.
Poor seam finish on
reverse side of material.
Lower thread tension
Thread take-up spring
tension and height
Upper thread tension
Lower thread tension
is too weak.
Upper thread tension
is too weak.
Thread take-up spring
tension and height are
incorrect.
13
13
13
Adjust the lower thread
tension.
Adjust the upper
thread tension.
Adjust the tension and
height of the thread
take-up spring.
Incorrect thread
tightness.
Sub-tension
Movable knife position
Sub-tension is too weak.
34
13
Turn the sub-tension nut
to adjust the tension.
Adjust the position of
the movable knife.