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Bad condition Cause Remedy
Ref. page &
Item
Pre-tension is too loose Make pre-tension tighter P36-7-11
Adjust trimmer cam position P32-7-9-2.6Trimmer timing is delayed
Adjust synchronizer position P37-7-15
Upper thread tension release timing
is too fast
Delay tension release timing
Control unit
4.
Thread tail
from needle is
too long after
timing
Thread guide is in wrong position Adjust thread guide position
properly
P35-4)
Trimmer function is canceled Resume trimmer function Control unit
Fixed knife is dull Change it new knife P30-7-9-2.1
Movable knife is in wrong position Adjust movable knife position
properly
P30-7-9-2.2
Skip stitching happens at trimming Fix skip stitching P44-3
Trimmer air cylincle is out of order Change it new air cylincle ---
Adjust trimmer cam position P37-7-9-2.6
5.
Trimming is not
functioned
Trimmer timing is wrong
adjust synchronizer position P37-7-15
Needle and rotating hook clearance is
too big
Adjust needle and rotating hook
clearance properly
P21-7-2-8)
Needle and rotating hook timing is not
correct
Adjust needle and rotating hook
timing properly
P21-7-2-7)
Needle is bent Change it new needle ---
Needle is in wrong position Amend needle position P20-7-1
6.
Skip stitching
often happens
Stepping foot position is not correct Adjust stepping foot position
properly
P23-7-5
Upper thread tension is not tight
enough
Increase upper thread tension
P19-6-3-2)
Adjust tension regulator position
properly
P36-7-13
Thread tension regulator’s discs are
opened during sewing
Adjust upper tension foot timing
properly
P35-7-10
Stepping foot position is not correct Adjust stepping foot timing properly P23-7-5
7.
Stitch forming
is loose
Stepping foot up and down timing is
not proper
Adjust stepping foot timing properly
P26-7-5-3
Cables wiring is disconnected Connect all cables precisely P9-3-12
System software is not loaded Load system software to control
box
P12-5-1
Emergency stop switch is kept ON Release emergency stop switch
lock
P16-6-1
8.
Sewing
machine does
not work eve
start switch is
turned ON
Start switch is out of order Change it new start switch ---
Synchronizer cable is disconnected Connect synchronizer cable
precisely
Control unit
9.
Sewing machine
runs idle at high
speed when power
switch is turned ON
Synchronizer is out of order Change it new synchronizer
---
Work holder activate solenoid valve
cable is disconnected
Connect the cable precisely
Control unit
Work holder presser is not strong
enough
Increase work holder presser
P28-7-8-1
10.
Work holder
does not work
Work holder switch is out of order Change it new work holder switch ---
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