148
PROBLEM
TIP or PAGE
REMEDY
PROBABLE CAUSE
Upper thread comes
out of the eye of the
needle after the trim.
Tread is not cutting
on one of the heads.
No solenoid
operation of the
upper thread catcher.
The default tail length is
Medium.
Confirm correct fuse size
and voltage.
Check upper thread tension.
Set the length of the thread
tails to Long or Medium on
the control panel.
Remove any foreign
substance in the Velcro strip
that may be causing the
thread to break.
Check the fastening screw
of the movable blade, the
crank of the movable blade,
the driving clamp and the
connection of fastening
screw.
Adjust the tension of the
fixed screw.
Replace the movable blade.
Adjust the position of the
movable blade.
Replace F4 fuse in the
power board if required.
Check solenoid terminal
connection and/or replace
the solenoid.
Replace thread sensor disc
on pre-tensioner (thread
sub-controller).
Check connection
Upper thread has been
trimmed too short.
Upper thread tail is above
the throat plate after cutting.
The movable and fixed
blades are not working.
The cross tension of the
movable blade and the fixed
blade is too loose.
The movable blade is
broken.
The movable blade does not
return to its correct position.
Short circuit of the fuse.
(when all heads operate
incorrectly)
Malfunction of the solenoid
wiring or the solenoid itself.
Malfunction of circuit disc.
Bad connection