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17. TROUBLESHOOTING
169KE-430F, BE-438F
Problem Cause Remedy Ref.
Upper thread tension is too strong. Adjust the upper thread tension.
CD
Instruction
manual
Needle is installed incorrectly. Install the needle correctly.
CD
Instruction
manual
Thread is too thick for the needle. Use the correct thread for the needle. P. 103
Thread take-up spring tension and
height are incorrect.
Adjust the tension and height of the
thread take-up spring.
P. 105
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.
CD
Instruction
manual
Lower thread tension is too strong. Adjust the lower thread tension.
CD
Instruction
manual
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. 107
Incorrect needle and rotary hook timing. Adjust the needle bar lift amount. P.107
Driver is contacting needle more than is
necessary.
Adjust the driver needle guard. P. 107
Needle is bent. Replace the needle.
Skipped stitches occur.
Needle is installed incorrectly. Install the needle correctly.
CD
Instruction
manual
Adjust the needle clearance. P. 107
Needle is touching the rotary hook.
Adjust the needle bar lift amount. P. 107
Needle is bent. Replace the needle.
Needle is too thin. Use the correct needle for the material. P. 103
Needle breaks.
Needle is striking the button. (BE-438F)
Refer to “5-5. Checking the sewing
pattern (BE-438F)” in the CD instruction
manual.
CD
Instruction
manual
Button breaks.
(BE-438F) Needle is striking the button.
Refer to “5-5. Checking the sewing
pattern (BE-438F)” in the CD instruction
manual.
CD
Instruction
manual