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7 7
Trouble shooting
1) Machine part
No.
Problems
Problems of machine
1
and operation
Incorrect stop position
2
3
Needle break
Thread breakage
4
5
Skipped sewing
Incorrect thread
6
tightening
Missing thread
7
trimming
36
Causes
excessively loose belt tension or belt damage
power or circuit fuse disconnection
disconnection from limited position of X or Y of
feed bracket
loose main drive belt
incorrect position of synchro
needle damage
(bent needle, damage on the eye of needle or
hole, or worn-out or changed needle point)
incorrect needle setting
needle and shuttle contact
wrong threading
wrongly inserted needle
(needle height and direction etc.)
damaged needle
(bent needle, damage on the eye of needle or
hole, or worn-out or changed needle point)
too tight tension on lower and upper thread
excessive tension and workload at thread take-up lever spring
flaw on thread regulating hole area of spring on
upper part spring of shuttle
bent needle use
wrong size needle for sewing thread
incorrect needle installationa
wrong needle and timing
improper hole and wide space between hole and shuttle point
excessive tension and workload at thread take-up lever spring
weak upper thread tension
weak lower thread tension
improper needle and shuttle timing
loose crossed tension of moving mes and fixing mes
worn-out knife edge hole of moving and fixing mes
incorrect position of thread trimmer cam
Solutions
belt tension adjustment and belt change
Check disconnection of major motor drive fuse
in control box and change it
Move feed bracket to the right position (within
switch limitation)
belt tension adjustment
synchro position adjustment
new needle installation
correct needle installation
needle and shuttle space adjustment
correct threading
needle replacement
needle change
tension adjustment
changing thread take-up lever spring tension and workload
replacement of new spring of shuttle upper part
needle change
needle change
needle reinstallation
readjustment of needle and shuttle timing
readjustment of needle and shuttle timing
adjustment of thread take-up spring tension and workload
adjustment of upper thread tension
adjustment of lower thread tension
readjustment of needle and shuttle timing
adjustment of fixing mes tension
changing moving and fixing mes
readjustment of thread trimmer cam position
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