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Bad
Cause
condition
Upper thread tension is not
tight enough
Thread tension regulator's
discs are opened during
sewing
7.
Stitch forming
Presser foot position is not
is loose
correct
Driver and shuttle hook
clearance is very small
Presser foot up and down
timing is not proper
Cables wiring is
8.
disconnected
Sewing
machine does
System software is not
not work even
loaded
start switch is
Emergency stop switch is
turned ON
kept ON
9.
Synchronizer cable is
Sewing
disconnected
machine runs
Synchronizer is out of order
idle at high
speed when
power switch is
turned ON
Work holder activate cable
is disconnected
10.
Work holder activate cable
Work holder
is not strong enough
does not work
Work holder switch is out of
order
Work holder switch is not
strong enough
11.
Sewing pattern
sewing material weight is
is distorted
very heavy
X timing belt is loose
From the library of: Superior Sewing Machine & Supply LLC
Remedy
Increase upper thread tension
Adjust tension regulator position
properly
Adjust upper tension release position
properly
Adjust presser foot position properly
Change shuttle hook
Adjust presser foot timing properly
Connect all cables precisely
Load system software to control box
Release emergency stop switch lock
Connect synchronizer cable precisely
Change it new synchronizer
Connect the cable precisely
Increase work holder pressure
Change it new work holder switch
Increase work holder pressure
Slow down sewing speed
Slow down feeding speed
Select sewing material weight level at
feeding
Adjust X timing belt tension properly
29
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—
Ref.page &
item
6-3
7-17
7-17
7-6
—
7-6
3
5-1
6-1
control unit
—
control unit
7-9
—
7-9
6-2
control unit
control unit
7-21
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