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32
VT2500
Trouble
Check item
Remedial action
Ref. page
Skip stitch
Is the thread wrongly threaded?
String the thread properly.
17
Is the needle bent or the tip broken?
Replace the needle.
16
Is the thread too much tightened?
Loosen the thread by the tension unit.
18
Are the timing and clearances of the
needles, looper and needle guards
correct?
Correct the timing and clearances of
the needles, looper and needle guards.
27 ~ 29
Is the needle too thin for the thread?
Either replace the needle or the
thread with the proper size.
16
I s t h e n e e d l e w r o n g l y a t t a c h e d
(direction or insertion depth)?
Attach the needle correctly.
16
Thread breakage
Is the thread caught on the eyelet?
Remove the caught thread.
Is the thread wrongly threaded?
String the thread properly.
17
Is the thread too much tightened?
Loosen the thread at the tension unit.
18
Is the needle too thick for the
thread?
Either replace the needle or the
thread with the proper size.
16
Is the thread good quality?
Use a good quality thread.
Did the thread break under heat?
Use the SP device.
20
Is there damage on eyelet, looper
thread take-up, etc?
Either repair the damage or replace
with a new part.
Needle breakage
Did the needle contact the looper?
Correct the clearances of the needles,
looper and needle guards.
27・29
Improper thread
tension
Is the thread wrongly threaded?
String the thread properly.
17
Are the needle threads and looper
thread properly balanced?
Correct the balance at the tension
unit.
Uneven tension
Is the thread wrongly threaded?
String the thread properly.
17
Are the needle threads and looper
thread properly balanced?
Correct the balance at the tension
unit.
O i l d o e s n o t
come from nozzle
Is oil level below the line on the oil
gauge?
Add oil.
13・14
Is the oil filter clogged?
Replace the oil filter.
15
7.
Troubleshooting