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Troubleshooting
6.1) Machine Part
Excessive relaxation of the belt tension or
the damage to the belt
Power cutoff or the cut of the circuit fuse
Separation of feed bracket from X or Y limit
Loose main driving belt
Wrong synchro location
Damage to needle (crooked needle, scratch
on needle hole or groove, abrasion or
deformation of the needle tip)
Wrong needle installation
Contact between needle and hook
Wrong thread placement
Wrong needle installation (needle height,
needle direction, etc.)
Damaged needle (crooked needle, scratch
on needle hole or groove, abrasion or
deformation of the needle tip)
Too strong upper and lower thread tension
Excessive thread take-up lever spring
’
s
tension and moving scope
Crooked needle used
Improper needle for used thread
Bad needle fitting condition
Improper needle and timing
Improper groove, and wide gap between
hook points
Excessive thread take-up lever spring’s
tension and moving scope
Faulty machine
operation
Improper stop position
Needle break
Thread break
Stitch skip
1
2
3
4
5
Adjust the belt tension and replace the belt
Check whether the main shaft motor drive
fuse is cut and replace it if so.
Properly place the feed bracket at the
normal position (within the scope of the limit
switch)
Adjust the belt tension
Adjust the synchro location
Replace the needle
Properly install the needle
Adjust the distance between needle and
hook properly
Insert the needle again
Replace the needle
Adjust the tension
Adjust the thread take-up lever spring
tension and moving scope
Replace the needle
Replace the needle
Refit the needle
Adjust the needle and hook timing
Adjust the needle and hook timing
Adjust the thread take-up lever spring
tension and moving scope
No
Trouble
Cause
Corrective Action
