SINGER W1624 - Manual (Page 42)

f PROBLEM
PROBABLE CAUSE
CORRECTION A
Breaking upper
thread
• Incorrect threading
• Thread jams inside the shuttle.
• Incorrect needle inserting.
• Upper tension too tight.
• For the fabric used, the thread is too thin.
P.5
Remove thread
P.14
P.9
P.15
Breaking lower
thread
• Thread not wound sevenly on the bobbin or not drawn up correctly.
• Lower thread tension too tight.
• Lint stuck in the bobbin case and inside the tension spring.
P.12 P.13
P.10
Remove lint and
clean coit a brush.
Skipping stitches • 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 shuttle.
P.14
P.14
P.15
P.5
P.36 and remove
excess oil.
The material
puckers
• Upper or lower thread tension too tight.
• Stitch too long for mterial
• Thread too thick
• Incorrect threading of upper or lower thread.
P. 9 P.10
P.16
P.15
P. 5 P.13
The thread makes
loopers
• Incorrect setting of bobbin case
• Incorrect threading.
• Unbalance tension of upper and lower thread.
P.36
P.5
P. 9 P.10
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