23
Troubleshooting
9.Improper upper threading
[Example of phenomenon] [Check item before adjustment]
Is the needle positioned at the top?
Is the thread threaded properly through the needle guide?
Is the upper thread threaded properly?
Is the needle installed correctly?
Is a needle # 11 to # 16 used?
Is the needle bent?
Step Item Diagnosing Method Standard
Reference
Page
1. Needle
threader
Needle
threader
height
<Condition>
Needle: # 11 to # 16
<Diagnosis>
When the needle bar is brought to the upper
dead point by turning the handweel, check
the movement of needle threader lever by
pressing it down.
Threader hook
must pass
through the
needle hole
without
smoothly.
[Adjustment]
page.38
Bent
threader
hook
<Diagnosis>
Chech the shape of threader hook.
Threader hook
must not be
bent.
[Adjustment]
page.38
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