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Uneven Seams; All Stitches - Brother HE-800A Service Manual

Electronic lockstitch button holer
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5. TROUBLESHOOTING
5-12. Uneven seams (10) ...... All stitches
Cause
Threading
Thread path
Needle
Thread chips or dust
Upper thread
Rotary hook holder
Rotary hook
Bobbin winder guide
Lower thread
Bobbin case
Stitch patterns
110
Check
Upper thread threading
Lower thread threading
Flaw or abrasion on the
thread path
Needle installation
Needle size
Rotary hook rim
Rotary hook edge
Around needle plate hole
Upper thread tension
Thread and needle
Flaw on the rotary hook
holder
Rotary hook holder and
inner rotary hook overlap
amount
Rotary hook lubrication
Bobbin thread tension
Uneven bobbin winding
Lower thread tension
Damaged
outside
bobbin case and bent
bobbin holder spring, etc.
Purl stitch, whip stitch
Thread the upper thread correctly.
Thread the lower thread correctly.
Polish with buff or replace the part.
Especially, pay attention to finishing around needle
plate hole.
Insert needle fully into needle bar
Replace needle with thicker one.
Remove thread chips or dust
Increase upper thread tension while checking
stitches.
Replace needle with one that fits for the thread.
Polish with buff or replace the part.
Adjust the rotary hook holder and inner rotary hook
overlap amount.
Decrease the quantity of lubrication oil.
* Note that if you reduce the amount of oil too much,
thread breakages may occur.
Adjust the tension on the bobbin winder guide.
Move bobbin winder tension bracket up and down to
adjust.
Adjust the lower thread tension.
of
Polish with buff or replace the part.
* Use the HE-800A bobbin case.
Set using parameter number 11.
Remedy
Needle plate hole
Check flaw here
Adjust the rotary hook
overlap amount.
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