Owner's Manual

12. TROUBLESHOOTING
BAS-300G-484, BAS-300G-484 SF
74
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Problem Cause Remedy Reference
Lower thread winds
to one side.
Bobbin winder tension assembly height
is incorrect.
Adjust the height of the bobbin winder
tension assembly.
P. 22
Lower thread winding
amount is incorrect.
Bobbin presser position is incorrect. Adjust the position of the bobbin presser. P. 22
Needle is thick.
Select a needle that is suitable for the
sewing conditions.
P. 24
When threading the thread through the
needle, allow a distance of
approximately 45 mm between the
needle hole and the end of the thread.
P. 20
Adjust the sub-tension so that the upper
thread trailing length after thread
trimming is approximately 45 mm.
P. 24
Upper thread trailing length is short.
Increase the stroke of the thread take-up
lever.
* Adjusting the stroke of the thread
take-up lever should be carried out
also if adjusting the sub-tension fails
to prevent the thread from pulling out.
P. 57
Amount of lower thread being fed out
from bobbin is small.
Set the feeding amount to approximately
30 mm.
P. 23
Thread unravelling at
sewing start.
Sewing start speed is fast. Adjust the sewing start speed. P. 34
Rotary hook tip is missing. Replace the part. *
Needle is thin.
Needle is thick.
Select a needle that is suitable for the
sewing conditions.
Needle is bent. Replace the needle.
Needle is incorrectly installed. Install the needle correctly. P. 20
Clearance between needle and rotary
hook tip is large.
Adjust the needle clearance. P. 56
Needle and rotary hook timing is
incorrect.
Adjust the needle bar lift amount. P. 56
Replace the needle hole plate with one
with a smaller hole diameter.
Use a thinner feed plate.
* Recommended thickness: 1.5 mm
Process the work clamps and the feed
plate into shapes that can hold the
material near the seam.
P. 67*
Skipped stitches occur.
Material is flapping.
Adjust the intermittent height of the
intermittent presser foot.
(-484 SF specifications only)
P. 31