68
Trimming
Failure (on
specific heads)
Failure to create
initial stitch after
trimming
Upper Thread
Holder Motor's
Failure to
Operate
Failure to Hold
the Upper Thread
① The moving and fixed
blades do not operate.
② Loose crossing tension of
the moving and fixed
blades
③ Damage to the moving
blade
④ Wrong return position of
the moving blade
① Short upper thread
② Short lower thread
③ Inappropriate function of
the lower thread holder
① Bad fuse condition of the
upper thread holder motor
and poor connector
connection
② Faulty board
① Short upper thread holder's
stroke
② Poor operation of the
operational overload to the
upper thread holder
■ Check the conditions of the
tightening screw for the
moving blade and the
tightening screw for the
moving blade crank
trimmer driving clamp.
■ Adjust the tension of the
fixed blade
■ Replace the moving blade
■ Adjust the position of the
moving blade
■ Adjust the tension of the
upper and lower thread
■ Check the front fuse on the
control box and replace the
fuse or check the
connection status of the
connector
■ Replace the joint board
■ Adjust the upper thread
holder's stroke
■ Readjust the upper thread
holder to remove the
operational overload
■ Check the rated
voltage of the fuse
= 250V 2A
Corrective Action and Check PointCause of TroubleType Remarks
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