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Bad condition
Pre-tension is too loose
4.
Trimmer timing is delayed
Thread tail from
Upper thread tension release
needle is too
long after
trimming
Tread guide is in wrong position
Trimmer function is canceled
Movable Knife is in wrong
5.
Trimming is
Skip stitching happens at
not functioned
Trimmer timing is wrong
Needle and shuttle hook
Needle and shuttle hook timing
6.
Skip stitching
often happens
Needle is bent by driver
Needle is in wrong position
Presser foot position is not
Upper thread tension is not
Thread tension regulator's
discs are opened during sewing
7.
Stitch forming
Presser foot position is not
is loose
Driver and shuttle hook
clearance is very small
Presser foot up and down
Cables wiring is disconnected
8.
Sewing
System software is not loaded
machine does
not work even
Emergency stop switch is kept
start switch is
turned ON
Start switch is out of order
9.
Sewing
machine runs
idle at high
speed when
Synchronizer is out of order
power switch
is turned ON
From the library of Superior Sewing Machine & Supply LLC • www.supsew.com
Cause
timing is too fast
Fixed knife is dull
position
trimming
clearance is too big
is not correct
Needle is bent
correct
tight enough
correct
timing is not proper
ON
Synchronizer cable is
disconnected
Remedy
Make pre-tension tighter
Adjust trimmer cam position
Adjust synchronizer position
Delay tension release timing
Adjust thread guide position
properly
Resume trimmer function
Change it new knife
Adjust movable knife position
properly
Fix skip stitching
Adjust trimmer cam position
Adjust synchronizer position
Adjust needle and shuttle hook
timing properly
Adjust needle and shuttle hook
timing properly
Change it new needle
Adjust needle and diver clearance
properly
Amend needle position
Adjust presser foot position
properly
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
Release emergency stop switch
lock
Change it new start switch
Connect synchronizer cable
precisely
Change it new synchronizer
― 38 ―
box
Ref. page
& Item
7-14
7-10
7-18
Control
unit
7-5
Control
unit
7-11
7-11
7-6
7-10
7-18
7-2
7-2
----
7-4
7-2
7-6
6-3(2)
7-17
7-17
7-6-1
----
7-6-3
3
5-1
6-1(3)
----
Control
unit
----
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