Trouble Shooting - Premier MCO-5199 Manual De Instrucciones

1. Loosen screw on the needle plate and remove needle
plate;
2. Rotate hand wheel and make needle at the top position
and raise presser foot; clean feed dog and surrounding
rags by brush;
3. Clean the lubrication shuttle race.
Pull lever "a"of shuttle race outward, remove cover "b" of
shuttle hook and shuttle hook "c", wipe them cleanly with
soft cloth, and then wipe shuttle race cleanly and add 1-
2drops of sewing-machine oil, rotate hand wheel and
make shuttle hook bracket "e" sway to the position shown
as figure, finally assemble the parts in turn.
Note:
- Shut off power during cleaning and maintenance;
- Feed dog and shuttle race shall be regularly cleaned
and maintained.
Trouble Shooting
Problems
The Upper thread broken
The lower thread breaks
Skipping stitch
Needle breaks
P-16
Causes
1. The upper thread is not
threaded correctly.
2. The upper thread tension is too
large.
3. The thread is too thick or fine.
4. Needle is improperly mounted. 4. Mount it again
5. Needle is distorted or blunt.
1. The lower thread is improperly
put into bobbin thread slot.
2. There are rags in shuttle hook. 2. Clean shuttle race
3. The bobbin is damaged and
couldn't work normally.
1. Needle is improperly mounted. 1. Mount it again
2. Needle is damaged.
3. Needle and thread is
improperly selected.
4. The upper thread is not
threaded correctly.
1. Needle is bent.
2. Needle is improperly mounted. 2. Mount it properly
Amendments
1. Thread it again.
2. Reduce the tension (adjust to
the lower setting value)
3. Select suitable thread
5. Replace needle
1. Mount it again
3. Replace bobbin
2. Replace needle
3. Select proper needle and
thread
4. Thread it again.
1. Replace needle