All Stitches - Brother HE-800A User Manual

- . Uneven seams (10) ...... All stitches
Cause
Threading Upper thread threading
Lower thread threading
Thread path Flaw or abrasion on the
thread path
Needle Needle installation
Needle size
Thread chips or dust Rotary hook rim
Rotary hook edge
Around needle plate hole
Upper thread Upper thread tension
Thread and needle
Rotary hook holder Flaw on the rotary hook
holder
Rotary hook holder and
inner rotary hook overlap
amount
Rotary hook Rotary hook lubrication
Bobbin winder guide Bobbin thread tension
Uneven bobbin winding
Lower thread Lower thread tension
Bobbin case Damaged
bobbin case and bent
bobbin holder spring, etc.
Stitch patterns Purl stitch, whip stitch
Check
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.
outside of Polish with buff or replace the part.
* Use the HE-800A bobbin case.
Set using parameter number 11.
HE-800A
16. TROUBLESHOOTING
Remedy
Needle plate hole
3996Q
Check flaw here
Adjust the rotary hook
overlap amount.
3997Q
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