Service manual

Revised 03/2006
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2-3
SYMPTOM
POSSIBLE CAUSE
PROBABLE SOLUTION
S-311
Deburr or replace the looper.
Deburr or replace the throat
plate.
Thread breakage.
Thread draw-off is too tight
Damaged loopers, spreaders, or
throat plate.
Incorrect needle and sewing
mechanism adjustment.
Poor thread quality.
Thread holes in the needle and
the looper are too small.
Bent or broken needle.
Needle track on a looper.
Damaged throat plate.
Incorrect sewing system adjust-
ment
Incorrectly adjusted thread draw-
off.
Bent needle or damaged stitch
forming parts.
Incorrectly adjusted sewing
mechanism.
Incorrect needle guard distance.
Defective spreader return springs
Knife and cutting steel are
incorrectly installed.
Cutting cylinder pressure is too
low.
Damaged knife.
Knife does not return.
Knife incorrectly installed.
SYMPTOM
POSSIBLE CAUSE
PROBABLE SOLUTION
SERVICE
SECTION
E12
E4,E10,E7,
E11,E12
E12
E10,E11
E13
Reduce thread tension.
Replace damaged parts.
Correctly adjust the needle bar,
loopers, openers and tension.
Replace thread.
Use correct parts.
Roll the needle on a smooth flat
surface, if bent, replace the
needle.
Replace the damaged parts.
Check the knife impression on
the cutting steel, adjust or
replace as needed.
Check the knife. Replace if
damaged.
Correctly adjust.
Correctly adjust the sewing
mechanism
Correctly adjust the sewing
mechanism.
Set the distance to 0.05 mm.
Replace the springs.
Adjust or replace the spring.
Tighten the adjusting screw
by 1/2 rotation and check the
cutting.
Replace the knife.
Correctly install the knife.
2. FAULTS WITHOUT ERROR MESSAGES
TROUBLESHOOTING
The machine does
not sew.
Skip stitches.
Sewn fabric is
incorrectly cut.
Top thread is not
trimmed.
B7