13. TROUBLESHOOTING
BAS-342G PS
74
Problem Cause Remedy Reference
Needle is too thin.
Replace the needle with one with a
higher count.
Incorrect tightening of
the thread.
Damage to the hook stopper.
Buff the hook stopper to remove the
damage, or replace the hook stopper.
*
Thread take-up spring tension and
height are incorrect.
Adjust the tension and height of the
thread take-up spring.
P. 55
Sub tension is too weak.
Turn the sub tension nut to adjust the
tension.
P. 24
Upper thread trailing
length is irregular.
Fixed knife is not cutting cleanly.
Sharpen the fixed knife or replace it
with a new one.
P. 62
Thread take-up spring tension is too
strong.
Adjust the tension of the thread take-up
spring.
P. 55
Lower thread is
protruding from the top
of the material.
Insufficient thread take-up amount.
Adjust the position of arm thread guide
R.
P. 56
Lower thread tension is too weak. Adjust the lower thread tension. P. 24
Lower thread is threaded incorrectly.
Pass the lower thread through the
window of the inner rotary hook.
P. 23
Sewing speed is too high. Reduce the sewing speed. P. 30
Needle is incorrectly installed. Install the needle correctly. P. 19
Select the correct intermittent presser
foot.
*
Upper thread position is incorrect.
Grind the cylinder of the intermittent
presser foot so that it does not touch
the thread.
*
Hitch stitch sewing
range is too great.
Needle is shaking.
Replace the needle with one with a
higher count.
Thread trailing length
underneath the material
is too short.
Fixed knife position is too close to the
needle hole plate.
Install the fixed knife in the correct
position.
P. 62
Check if the safety switch cord is
disconnected.
P. 12
Adjust the position of the safety switch. P. 18
Sewing machine does
not operate when the
power is turned on and
the foot switch is
depressed.
Safety switch does not work.
If the safety switch is malfunctioning,
replace it with a new one.
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