Mitsubishi LU2-410 User Manual

THREAD TRIMMER TROUBLESHOOTING LIST
Trouble
Cause
Corrective Action
Reference
Thread is not tri
mmed.
1. Roller does not rest onto
cam groove when needle is
at the lowest position.
Adjust cam follower
crank position.
Check setting of sole
noid crank.
Sec. 7 (10) in P. 22
Sec. 8 in P. 23
2. Fixed knife is not in posi
tive engagement with mova
ble knife.
Adjust intermeshing pre
ssure between movable
and fixed knives.
Sec. 5 in P. 21
3. Movable knife is improperly
located.
Check setting of movable
knife.
Sec, 1 in P. 18
4. Machine stop position tim
ing is too advanced.
Adjust synchronizer.
P24
5. Thread trimmer cam is
improperly adjusted.
Adjust thread trimmer
cam.
Sec. 3 in P. 19
6. Needle thread tension re
lease timing is too advanced.
Adjust needle thread ten
sion regulator.
Sec. 4 in P. 20
After thread tri
mming, needle
thread slips out
of needle.
1. Needle thread tension disc
fails to open.
2. Thread catches in thread
retainer.
3. Thread is not smoothly
passed through thread hand
ling parts.
Adjust needle thread ten
sion regulator.
Check threading of nee
dle thread.
Polish thread handling
parts such as thread
retainer, needle thread
tension regulator, and
needle clamp.
Sec. 4 in P. 20
Sec. 4 in P. 9
4. Needle thread tension re
leasing timing is too delayed.
Adjust needle thread ten
sion regulator.
Sec. 4 in P. 20
After trimming,
needle thread is
too long.
1. Bobbin thread retaining
spring pressure is too high.
2. Pretension is insufficient.
Reduce spring pressure.
Increase spring pressure.
3. Needle thread tension re
leasing timing is too ad
vanced.
Adjust needle thread ten
sion regulator.
Sec. 4 in P. 20
28
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

Mitsubishi LU2-410 Specifications

General

Brand	Mitsubishi
Model	LU2-410
Category	Sewing Machine
Language	English