
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 Point
Cause of Trouble
Type
Remarks