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39－
Bad condition Cause Remedy
Ref. page &
Item
Upper thread tension is not tight
enough
Increase upper thread tension
6-3(2)
Adjust tension regulator
position properly
7-17
Thread tension regulator’s discs
are opened during sewing
Adjust upper tension release
position properly
7-17
Needle and shuttle hook is in wrong
Adjust needle and shuttle
hook position
7-2
Driver and shuttle hook
clearance is very small
Adjust clearance between
driver and shuttle hook
----
7.
Stitch forming is
loose
Presser foot up and down timing
is not proper
Adjust presser foot timing
properly
7-6-3
Cables wiring is disconnected Connect all cables precisely
3
System software is not loaded
Load system software to
control box
5-1
Emergency stop switch is kept
ON
Release emergency stop
switch lock
6-1
8.
Sewing
machine does
not work even
start switch is
turned ON
Start switch is out of order Change it new start switch 3-7
Work holder activate cable is
disconnected
Connect the cable precisely ----
Work holder pressure is not
strong enough
Increase work holder
pressure
7-9
9.
Work holder
does not work
Work holder switch is out of
order
Change it new work holder
switch
3-7
Decrease sewing speed 6-2
Decrease feeding speed Control unit
Sewing material is too heavy
Select heave material setting Control unit
10.
Sewing pattern
is distorted
X or Y driving gear clearance is
not proper
Adjust X or Y driving gear
clearance
7-21
X or Y detector cabled are
disconnected
Connect X-Y cables precisely
----
X-Y detectors are out o order
(Red pilot lamps do not go on at
home position)
Change them new detectors
(Make sure red pilot lamps go
on at home position)
7-19
11.
Work holder
does not stop at
home position
Detector and detector plate
clearance is too big
Adjust the clearance properly ----
Detector or detector plate
mounting is loose
Check setscrews and tighten
them securely
7-19
Detector and detector plate
clearance is bigger than
standard
Adjust detector and detector
plate clearance properly
7-19
12.
Work holder
stops at not
original home
position
Home position correction
function is in working
Cancel home position
correction function
Control unit
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