Table of Contents
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No
Trouble
Bad thread tightening
condition
6
Missing thread
7
trimming
40
Cause
Weak upper thread tension
Weak lower thread tension
Improper needle and hook timing
Relaxed crossing tension of the 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 hook timing
Adjust the fixed blade tension
Replace the moving and fixed blades
Readjust the location of the trimmer cam
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