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No.
Trouble
Errorin thread
5
tightening
6
Error in trimming
36
Cause
Weak tension of upper thread
Weak tension of lower thread
Improper timing for needle and shuttle
Laxity of exchanging tension between
movable mes and fixed mes
Abrasion and crack on blade of movable
mes and fixed mes
Wrong position of trimming cam.
Corrective Action
Readjust the tension of upper thread.
Readjust the tension of lower thread.
Readjust the timing for needle and shuttle
Readjust the tension of fixed mes.
Exchange the movable mes and fixed mes.
Readjust the position of trimming cam
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