Mitsubishi LS2-190 - Page 31

Trouble
Cause
Remedy
Ref, para.
Thread is trimmed
with thread end
too long.
Pretensioner adjusted
too weak.
Trimming delays.
[51.4.^
[51.4.3.5
Stitch skipping
at starting
sewing
Trimmer type hook is
not used.
Use trimmer type hook
(hook having bobbin
thread guide groove).
El.4. 9
Racing of bobbin causes
Use bobbin case having
El.4. 9
entangling of thread
racing prevention
spring.
Bobbin thread tension is
Adjust bobbin thread
too tight.
tension to 10 - 15g,
1
Too large chamfering on
Use properly chamfered
1
1
presser foot and throat
presser foot and
plate.
throat plate.
Picker comes into con
EI-4.2.3
tact with bobbin.
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From the library of: Superior Sewing Machine & Supply LLC