8-11
Error Type Cause
Upper thread is trimmed
too short and comes
unthreaded
Upper thread is trimmed
too long and thread tail
remains on the embroidery
Failure of movable and
fixed blades
Loose cross tension of the
blades
Movable blade damaged
Incorrect return position of
movable blade
Poor connection/quality of
solenoid
Bad connection
Poor quality circuit board
Short strokes of upper
thread holder
Upper thread holder
overloaded
Cable fuse short-circuit
Circuit fuse short-circuit
Expired lifespan of the
lamp
Inspection & Repair
check upper thread tension
set or length
of trimmed thread in data set-
up
set or
length of trimmed thread in
data set-up
if upper thread is held due to
narrow velcro space in upper
thread holder, clean the
velcro
Check screws and crank driver
clamp screws of the movable
blade
Check tension of fixed blade
Change movable blade
Adjust the position of movable
blade
Check/change solenoid &
connection
Check connection
Change thread detecting plate
in sub controller
Adjust stroke
Adjust the workload
Replace the cable fuse
Replace the con. box lamp
ass’y fuse
Replace the fluorescent lamp
ShortMedium
MediumLong
The default is .
Change fuse spec
Change fuse spec
Change fuse spec
Medium
Reference
Short upper
thread after
trimming
Thread is not cut
(at specific
head)
Failure of upper
thread holder
solenoid
Failure to hold
upper thread
When the
fluorescent lamp
is not properly
operating, one
of the following
might be the
reason:
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