8. TROUBLESHOOTING
8.
TROUBLESHOOTING
• Please check the following points before calling for repairs
or
service.
• If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of
purchase.
AcAur10N
Turn off the power switch and disconnect the power cord before carrying out troubleshooting.
If
the foot switch is depressed by mistake, the sewing machine might start operating and injury could result.
Problem Cause Remedy Reference
Work clamp does not
Work clamp moves stiffly.
Apply a
su
itable amount
of
grease to the
/
lift.
sliding parts
of
the work clamp.
A
ir
tu
be
of
presser lifter cylinder is bent Straighten the bend in the tube
or
/
or damaged (Pneumatic specifications). replace the tube.
Work clamp does not
Work clamp moves stiffly.
Apply a
su
itable amount
of
grease to the
/
drop.
sliding parts
of
the work clamp.
Air tube
of
presser lifter cylinder is bent Straighten the bend in the tube or
/
or damaged (Pneumatic specifications). replace the tube.
Work clamp lift amount
Work clamp lift amount setting at
Change the work clamp lift amount
/
is incorrect.
operation panel is incorrect (Solenoid
setting.
specifications).
Work clamp arm
lever
position is Adjust the position
of
the work clamp
P.
35
incorrect. (Pneumatic specifications) arm lever.
Work clamp does not
Work clamp arm stopper position is
Adjust the position
of
the stopper.
/
lift to the
ma
ximum
incorrect (Solenoid specifications).
height.
/
Cylinder joint position is incorrect.
Adjust the position
of
the
cy
linder joint.
(Pneumatic specifications)
Thread wiper does
not operate correctly.
Ad
ju
st the height
of
the thread wipe
r.
P.
32
The thread wiper is obstructing the
needl
e.
Adjust the stroke
of
the thread wiper.
P.
32
Thread wiper position is incorrect. Adjust the stroke
of
the thread wiper.
P.
32
Lower thread winds
Bobbin winder tension assembly height Adjust the height
of
the bobbin winder
P. 18
to
one side.
is incorrect. tension assembl
y.
Lower thread winding
Bobbin presser position is incorrect. Ad
jus
t the position
of
the bobbin presser.
P.
18
amount is incorrect.
Thread slips out
of
Stitches being skipped at the sewing
Refer
to
"Skipped stitches occur".
P.
37
the needle.
start.
Upper thread length is irregular. Ad
jus
t the sub-tension.
P.
20
Positi
on
of
shuttle race thread guide is Adjust the position
of
the shuttle race
P.
28
incorrect thread guide.
36
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