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Problem
4. Machine does not feed
work.
5. Upper and lower
threads are breaking.
1542B
6. Broken needles
1543B
Cause
The feed dog is too low.
The presser foot pressure is too small.
The feed dog is worn out.
The presser foot floats and does not fully
press work.
The feed dog and presser foot work on
one side only.
The needle is bent or the needle tip is
broken.
The needle is not properly installed.
The needle is not properly threaded.
The upper or lower thread tension is too
weak or too strong.
The needle holes are too small for
threads.
The loopers are damaged.
The material is being pushed or pulled
with excessive force during sewing.
The needle is not properly installed.
The needle tip is bent.
The needle tip is broken, or the needle
hole is blocked.
Needles hit the loopers.
The needle holes are too small for
threads.
CAUTION:
・ It is extremely dangerous to leave any pieces of broken needle sticking in the material. If the
needle breaks, search for all pieces until the whole of the needle is found again.
・ Furthermore, we recommend that thorough steps be taken to account for such needles to comply
with product liability regulations.
DA-927A, DA-928A
10. TROUBLESHOOTING
Remedy
Adjust the feed dog height.
Adjust the presser foot pressure.
Have serviceman check it.
Have serviceman check it.
Have serviceman check it.
.
Replace the needle
Install the needle correctly.
Thread the needle correctly.
Adjust the upper thread or lower thread
tension.
Check the needle and thread counts.
Smooth the loopers with an oiled
grindstone or replace the damaged parts.
Do not push or pull the material with
excessive force.
Install the needle correctly.
.
Replace the needle
.
Replace the needle
Adjust the timing of the loopers running
clear of the needles.
Check the needle and thread counts.
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