13. TROUBLESHOOTING
BAS-342G PS
72
Problem Cause
Remedy
Reference
Upper thread tension is too strong.
Adjust the upper thread tension.
P. 24
Needle is incorrectly installed.
Install the needle correctly.
P. 19
Thread is too thick for the needle.
Select a thread that matches the needle.
P. 24
Thread take-up spring tension and
height are incorrect.
Adjust the tension and height of the
thread take-up spring.
P. 55
Damage or burring of the rotary hook,
needle hole plate, needle or thread path.
Repair or replace the problem part.
*
Thread breaking from heat
(Synthetic thread).
Use a needle cooler.
P. 20
Thread is threaded incorrectly.
Thread the thread correctly.
P. 20
Upper thread breaks.
Damage to the hook stopper.
Buff the hook stopper to remove the
damage, or replace the hook stopper.
*
Lower thread tension is too strong.
Adjust the lower thread tension.
P. 24
Lower thread breaks.
Damage to the needle hole plate or
bobbin case.
Repair or replace the problem part.
*
Clearance between needle and rotary
hook tip is too great.
Adjust the needle clearance.
P. 58
Needle and rotary hook timing is
incorrect.
Adjust the needle bar lift amount.
P. 57
The driver needle guard is covering the
needle more than necessary.
Adjust the driver needle guard.
P. 57
Needle is bent.
Replace the needle.
Needle is incorrectly installed.
Install the needle correctly.
P. 19
Skipped stitches occur.
Intermittent height of intermittent presser
foot is too high.
Adjust the intermittent height of the
intermittent presser foot.
P. 32
Adjust the needle clearance.
P. 58
Clearance between needle and rotary
hook tip is too great.
Adjust the needle bar lift amount.
P. 57
Needle is bent.
Replace the needle.
Needle deflection.
Select a needle that is suitable for the
sewing conditions.
Reduce the sewing speed.
P. 24
P. 30
Needle is broken.
Needle is too thin.
Select a needle that is suitable for the
sewing conditions.
P. 24
Thread take-up spring tension and
height are incorrect.
Adjust the tension and height of the
thread take-up spring.
P. 55
Thread jamming.
Needle and rotary hook timing is
incorrect.
Adjust the needle bar lift amount.
P. 57
Summary of Contents for BAS-342G PS
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