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10. TROUBLESHOOTING
BAS-311G, BAS-326G
143
Problem Cause Remedy Reference
Movable knife is not cutting cleanly. Replace with a new one. P. 95
Fixed knife is not cutting cleanly.
Sharpen the fixed knife or replace it
with a new one.
P. 95
Adjust the position of the shuttle race
thread guide.
P. 92
Movable knife is not picking up the
upper thread.
Adjust the needle bar lift amount. P. 91
Movable knife is not picking up the
upper thread because the last stitch is
being skipped.
Refer to "Skipped stitches occur". P. 142
Movable knife position is incorrect.
Adjust the position of the movable
knife.
P. 93
P. 94
Upper thread is not
trimmed.
Sub-tension is too weak.
Turn the sub-tension nut to adjust the
tension.
Instruction
manual
Shuttle race thread guide is not
separating the threads enough.
Adjust the position of the shuttle race
thread guide.
P. 92
Incorrect tightening of the upper thread Adjust the upper thread tension. P. 89
Poor stitch finish on
underside of material.
Upper thread length is irregular. Adjust the sub-tension.
Instruction
manual
Upper thread tension is too weak. Adjust the upper thread tension. P. 89
Lower thread tension is too weak. Adjust the lower thread tension. P. 89
Thread take-up spring tension and
height are incorrect.
Adjust the tension and height of the
thread take-up spring.
P. 90
Incorrect tightening of
the thread
Position of arm thread guide R is
incorrect.
Adjust the position of arm thread guide
R.
P. 90
Thread take-up spring tension and
height are incorrect.
Adjust the tension and height of the
thread take-up spring.
P. 90
Sub-tension is too weak.
Turn the sub-tension nut to adjust the
tension.
Instruction
manual
Upper thread length is
irregular.
Fixed knife is not cutting cleanly.
Sharpen the fixed knife or replace it
with a new one.
P. 95
Check if the machine head switch cord
is disconnected.
Instruction
manual
Adjust the position of the machine head
switch.
P. 88
Sewing machine does
not operate when the
power is turned on and
the foot switch is
depressed.
Machine head switch does not work.
If the machine head switch is
malfunctioning, replace it with a new
one.