Singer 812U Instruction Manual page 14

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I
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Trouble Cause
Remedy
r - Wrong threading
r - -
See paragraph on threading. 5
f--
Excessíve tension disc pressure.
I - - - Adjust to pro per pressure. 7
I--
Poor-quality thread. I - - - Use thread of good quality, 5
Thread is toa thick for needle eye.
Use needle of correct size or thread
5
f--
e - - .
of correct count.
Thread break
f -
f - Needle setting incorrect1y.
e - -
See paragraph on needle installing. 5
I--
Needle groove and needle eye
I - - -
Replace with good needle,
finished poor1y.
5
Needle, loopers and thread take-ups
See paragraphs on adjustment of left
9
I-- not positioned properly to one
I - - - hand looper vs. needle bar and thread
another.
tension.
6
' - -
Needle, loopers, throat plate,
I - - -
Smooth with oil stone or buff.
1/
thread passage have flaws,
r-- Wrong threading.
I - - -
See paragraph on threading.
5
f - Excessive tension disc pressure.
I - - -
Adjust to proper pressure. 7
I-- Needle setting incorrect1y.
~
See paragraph on setting needle. 5
Stitches skip
I--
~
Needle point blunt or bent. ~
Replace with new needle. 5
Needle, loopers and thread take-ups
See paragraphs on adjustrnent of left
9
f -
not positioned properly to one an-
I - - -
hand looper vs, needle bar and thread
6
other, or have incorrect clearance.
tension.
.
r--
Needle and needle guard not posi-
I - - -
See paragraph on adjustment of left
9
tioned properly to one another.
hand looper vs, needle bar.
'--- Looper point hangs down,
I - - -
Correct with oil stone, or replace
1/
with new looper.
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