Uneven Seams (4) - Brother KE-430HX Service Manual

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13. TROUBLESHOOTING
Cause
Shuttle race thread
guide
Thread nipper
Bobbin thread clamp
spring
13-6
. Uneven seams (4) ...... All stitches
Items with a "*" in the "Page" column should only be handled by a qualified technician.
Cause
Threading
Thread path
Thread chips or dust
Upper thread
Needle
Lower thread
Bobbin case
Needle plate
Feed plate
Work clamp
175
Check
Position of the shuttle race
thread guide
Stitch count
Bobbin thread clamp spring
Check
Upper thread threading
Lower thread threading
Flaw or abrasion on the
thread path
Shuttle race base rim
Hook edge
Around needle plate hole
Upper thread tension
Needle and thread
Installing a needle
Needle count
Lower thread tension
Damaged outside of bobbin
case and bent bobbin holder
spring, etc.
Relation between material
and needle plate
Relation between material
and feed plate
Relation between material
and work clamp
KE-430HX/KE-430HS, BE-438HX/BE-438HS
Remedy
Adjust the shuttle race thread guide position.
The needle groove is aligned
with the center of the needle.
Disable memory switch No. 500 setting: thread nipper
device operation.
Install the bobbin thread clamp spring.
Remedy
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.
Remove thread chips or dust.
Increase upper thread tension while checking stitches.
Replace needle that fits the thread.
Insert the end of the needle shank so that it touches
the top edge of the needle hole of the needle bar.
Replace needle with thicker one.
Adjust the lower thread tension appropriately.
Polish with buff or replace the part.
* Use the KE-430H/BE-438H bobbin case.
Use a needle plate that matches the material.
Use a feed plate that matches the material.
Use a work clamp that matches the material.
Page
137*
4077B
21
Page
*
*
Instruction
manual
132
132,
Instruction
manual
*

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Ke-430hsBe-438hsBe-438hx

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