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HE-800A
16. TROUBLESHOOTING
98
ውዒ
-
ውዎ
. Uneven seams (10) …… All stitches
Cause Check Remedy Page
Upper thread threading Thread the upper thread correctly. 58 Threading
Lower thread threading Thread the lower thread correctly. 60
Thread path Flaw or abrasion on the
thread path
Polish with buff or replace the part.
Especially, pay attention to finishing around needle
plate hole.
-
Needle installation Insert needle fully into needle bar 57 Needle
Needle size Replace needle with thicker one. -
Thread chips or dust Rotary hook rim
Rotary hook edge
Around needle plate hole
Remove thread chips or dust
69, 71
Upper thread tension Increase upper thread tension while checking
stitches.
62
Upper thread
Thread and needle Replace needle with one that fits for the thread. -
Flaw on the rotary hook
holder
Polish with buff or replace the part.
-
Rotary hook holder
Rotary hook holder and
inner rotary hook overlap
amount
Adjust the rotary hook holder and inner rotary hook
overlap amount.
74
Rotary hook Rotary hook lubrication Decrease the quantity of lubrication oil.
* Note that if you reduce the amount of oil too much,
thread breakages may occur.
26
Bobbin thread tension Adjust the tension on the bobbin winder guide. - Bobbin winder guide
Uneven bobbin winding Move bobbin winder tension bracket up and down
to adjust.
59
Lower thread Lower thread tension Adjust the lower thread tension. 61
Bobbin case Damaged outside of
bobbin case and bent
bobbin holder spring, etc.
Polish with buff or replace the part.
* Use the HE-800A bobbin case. -
Stitch patterns Purl stitch, whip stitch Set using parameter number 11. 37
3996Q
3997Q
Needle plate hole
Adjust the rotary hook
overlap amount.
Check flaw here