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7. TROUBLE CHART
PROBLEM
Breaking lower thread
Skipping stitches
Section
7
Irregular stitches
The material not fed
correctly
Noisy machine
PROBABLE CAUSE
Thread not wound evenly on the bobbin or not drawn up correctly
Lower thread tension too tight
Lint stuck in the bobbin case and inside the tension spring
Needle not fully inserted
Needle bent
Size or type of needle and thread not suitable for the material
Incorrect upper threading
Too much oil on the machine
Incorrect size of needle for the material
Upper thread tension too loose
Incorrect lower tension
Pattern selection dial not set correctly
Lint stuck on the feed dog
Check for thread in race, the slightest amount of thread in
race may cause noise or binding, use material like tooth pick
or cotton swab to clean.
English
CORRECTION
P.25, P.9, 11
P.101, 103
Remove lint and fluff
with a cleaning brush
P.31
P.31
P.35
P.9
P.87
P.35
P.19
P.101, 103
P.41
P.85
P.85
P.105
115
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