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29. TROUBLE CHART
Trouble
F
Probable Cause
Correct
•
Operation
Not plugged n proper y
Page 4
Macf rn
Power supply switch s not on
4
does
QT
sow
Thread is stuck in the hook groove
Lack of oi
43
Makir
g no se
Dust of thread jamming the rotary hook
42
Rur rang
ow
Dust of thread jamming the feed dog
42
Thread s stuck ir the hook goove.
42
Improper threading.
11
Upper thread tension too tight.
18
Needle bent or blunt
Breakir g
Improper needle setting.
upper
tt
reao
Removing fabric when take up lever is not in
the higtest position.
Upper thread too thick or too thin for need e
used
Improper threading
Breakir
Lower thread tension too tight
ower
thread
Dust of thread jamming the bobbin case or
around the spring of the bobbin case.
Improper needle setting
9
Skrpp ng
Needle bent
9
stitches
Improper needle and thread for the fabr c
9
Improper upper tkread ng.
11
L
Too ri uch o
I
j
43J
44
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