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10. TROUBLESHOOTING
10. TROUBLESHOOTING
If there is a problem with operation, first check that the threads are correctly threaded and that the needle is correctly installed.
Please check the following points before calling for repairs or service.
If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of
purchase.
Turn off the power switch and disconnect the power cord from the wall outlet before carrying out troubleshooting.
The motor will keep turning even after the power is switched off as a result of the motor's inertia. Wait until the motor stops
fully before starting work.
The machine may operate if the treadle is depressed by mistake, which may result in injury.
Problem
1. Upper thread is not
tight.
2. Skipped stitches occur
while sewing
1541B
3. Seam position is
incorrect.
25
Cause
The upper thread tension is too weak.
The lower thread tension is too strong.
The position of the upper thread take-up
guide is incorrect.
The position of the upper thread guide is
incorrect.
The needle is not properly installed.
The looper points are dull.
The needle and looper timing is incorrect.
The clearance between the needles and
loopers are incorrect.
The lower thread take-up timing is
incorrect.
The sub-feed dog height is incorrect.
The presser foot pressure is incorrect.
The feed dog height is incorrect.
DA-927A, DA-928A
CAUTION
Adjust the upper thread tension.
Adjust the lower thread tension.
Adjust the upper thread take-up guide
position correctly.
Adjust the upper thread guide position
correctly.
Install the needle correctly.
Replace the loopers with good ones.
Adjust the needle and looper timing
correctly.
Adjust the clearance between the needles
and loopers correctly.
Adjust the lower thread take-up timing
correctly.
Adjust the sub-feed dog height.
Adjust the presser foot pressure.
Adjust the feed dog height.
Remedy
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