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11. TROUBLESHOOTING
፧
77 KE-430F, BE-438F
Problem Cause Remedy Ref.
Upper thread tension is too strong. Adjust the upper thread tension.
P. 63
Needle is installed incorrectly. Install the needle correctly.
P. 26
Thread is too thick for the needle. Use the correct thread for the needle. P. 30
Thread take-up spring tension and
height are incorrect.
Adjust the tension and height of the
thread take-up spring.
P. 64
Damaged or burred rotary hook, needle
hole plate or needle.
File smooth or replace the affected
part.
Upper thread breaks.
Thread melting (synthetic thread) Use the needle cooler.
P. 22
Lower thread tension is too strong. Adjust the lower thread tension.
P. 63
Lower thread breaks.
Corners of needle hole plate or bobbin
case are damaged.
File smooth or replace the affected
part.
Clearance between needle and rotary
hook tip is too great.
Adjust the needle clearance. P. 66
Incorrect needle and rotary hook timing. Adjust the needle bar lift amount. P. 66
Driver is contacting needle more than is
necessary.
Adjust the driver needle guard. P. 66
Needle is bent. Replace the needle.
Skipped stitches occur.
Needle is installed incorrectly. Install the needle correctly.
P. 26
Adjust the needle clearance. P. 66
Needle is touching the rotary hook.
Adjust the needle bar lift amount. P. 66
Needle is bent. Replace the needle.
Needle is too thin. Use the correct needle for the material. P. 30
Needle breaks.
Needle is striking the button. (BE-438F)
Refer to “5-6. Checking the sewing
pattern” .
P. 42
Button breaks.
(BE-438F)
Needle is striking the button.
Refer to “5-6. Checking the sewing
pattern” .
P. 42