Table of Contents
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No.
Trouble
Bad thread tightening
6
condition
Missing thread
7
trimming
38
Cause
Weak upper thread tension
Weak lower thread tension
Improper needle and shuttle timing
Loose crossing tension between moving and
fixed blades
Scratch or abrasion on the moving and fixed
blades
Wrong trimmer cam location
Corrective Action
Adjust the upper thread tension
Adjust the lower thread tension
Adjust the needle and shuttle timing
Adjust the tension of the fixed blade
Replace the moving and fixed blades
Readjust the location of the trimmer cam
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