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