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Operating instructions for eventual trouble shooting
Meaning of abbreviations:NP - Instruction manual
SK - Instructions for service
Note: When the machine is driven by a stop motor, it is indispensable to check up, before starting its repair, the setting of its
parameters according to NP, part B, par. 5.
Trouble
1. Upper thread breaking.
2. Lower thread breaking.
3. Skipped stitches at the seam begin-
ning after previous thread trimming.
Cause
1.1 Incorrect threading of the upper
thread.
1.2 Excessive thread tension.
1.3 Needle incorrectly inserted or da-
maged.
1.4 Needle thickness does not suit to
that of thread or sewn material.
1.5 Hook point sticks the thread.
1.6 Incorrect side setting of throat pla-
te post or needle bed shifting - little
gap between needle and piercing
hole edge from hook side.
1.7 Rear needle guide in an excessive
back position - the right upper
thread is being slid on it.
1.8 Needle thread excessively elastic.
1.9 Low quality thread.
1.10 Needle thickness unsuitable for the
hole in the throat plate insert.
1.11 Damaged throat plate insert.
1.12 Incorrect setting of opening bob-
bin case lifter (little opening).
2.1 Incorrect threading.
2.2 Damaged bobbin.
3.1 Short thread end in needle after
trimming (thread too tensioned in
the moment of trimming).
3.2 Excessive thread tension.
3.3 Upper thread not squeezed, at the
first needle piercing, between
sewn material and rear edge of
piercing hole.
Method of troubleshooting
Thread the upper thread according to NP,
par. 6.1.
Set the tension according to NP, par. 6.3.
Replace needle according to NP, par. 6.5.
Use a thicker needle.
Set distance between hook and needle
according to SK, par. 3.1.3 and 3.1.5.
Set according to SK, par. 3.3.2.
Correct distance between needle and
hook according to SK par. 3.1.3.
Set rear needle guide, so that its front
edge fits with the rear edge of the right
piercing hole.
Increase the hook timing and set the nee-
dle bar height according to SK, par. 3.2.3.
Replace thread.
Replace insert.
Replace insert.
Set according to SK, par. 3.1.6.
Thread according to NP, par. 6.2.
Replace bobbin.
Thread upper thread according to NP,
par. 6.1. Reduce tension of pretension
unit according to NP, par. 6.3. Accelerate
slightly OFF position of main tensioner
according to SK, par. 4.8; NP, part B, par.
5.2.2, 5.3.2; Mini-stop, par. 5.2.5 - para-
meter 192.
Set thread tension according to NP, par. 6.3.
Set needle feeding in such a way, so that,
with the maximum stitch length, the nee-
dle almost touches the rear edge of throat
plate insert accordin to SK, par. 3.2.5.
Reduce height of wheel feeder accord-
ing to SK, par. 3.6.3.2.1.
Put nearer top roller to needle and shift it
rearwards according to SK, par. 3.7.6.2.
Reduce rear guide, so that it touches
slightly sewn material with lowered top
roller.
19


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