Singer 7640 CONFIDENCE Instruction Manual and Troubleshooting Guide - Page 34

Bobbin Thread Breaking, Needles Breaking, Bobbin Winding Difficulties

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24 TROUBLESHOOTING AND MAINTENANCE Troubleshooting 7. BOBBIN WINDING DIFFICULTIES Possible Cause: Bobbin thread loosely wound on bobbin. Solution: Rewind bobbin, making sure that the thread is placed snuggly in the bobbin winding tension disk. (See Page 13) Possible Cause: Bobbin winding spindle not fully engaged, therefore bobbin not winding. Solution: Check that the bobbin winding spindle has been fully engaged before starting to wind. (See Page 13) Possible Cause: Bobbin is winding sloppily because thread end not held at beginning of winding process. Solution: Before starting to wind, hold the thread tail (coming out of the bobbin) securely, allow the bobbin to partially ¿ll, then stop to trim the thread tail close to the bobbin. (See Page 13) 8. BOBBIN THREAD BREAKING Possible Cause: Bobbin threaded incorrectly. Solution: Check that bobbin is placed correctly in the bobbin case. (See Page 14) Possible Cause: Bobbin wound too full or unevenly. Solution: Bobbin thread may not have been correctly placed into bobbin winding tension disk during the bobbin winding process. (See Page 13) Possible Cause: Dirt or lint in bobbin case. Solution: Clean bobbin case. (See Page 37) Possible Cause: Wrong bobbins being used. Solution: Use SINGER® bobbins that are the same style as those that come with the machine - don't substitute. Your machine comes with Class 15 transparent bobbins. 9. NEEDLES BREAKING Possible Cause: Bent, dull or damaged needle. Solution: Discard needle, insert new needle. (See Page 28) Possible Cause: Wrong size needle for fabric. Solution: Insert appropriate needle for fabric type. (Go to www.singerco.com to view the Stitch Reference Guide) Possible Cause: Machine not threaded correctly. Solution: Rethread the machine completely. (See Page 15) Possible Cause: "Pushing" or "pulling" fabric. Solution: Don't manually push/pull fabric in order to sew, but allow the machine's feed teeth to draw fabric under the presser foot as you guide it. (See Page 23) 34

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34
TROUBLESHOOTING AND MAINTENANCE
Troubleshooting
8.
BOBBIN THREAD BREAKING
Possible Cause:
Bobbin threaded incorrectly.
Solution:
Check that bobbin is placed correctly in the bobbin case. (See Page 14)
Possible Cause:
Bobbin wound too full or unevenly.
Solution:
Bobbin thread may not have been correctly placed into bobbin winding tension disk
during the bobbin winding process. (See Page 13)
Possible Cause:
Dirt or lint in bobbin case.
Solution:
Clean bobbin case. (See Page 37)
Possible Cause:
Wrong bobbins being used.
Solution:
Use
SINGER
®
bobbins that are the same style as those that come with the machine –
don’t substitute. Your machine comes with Class 15 transparent bobbins.
9.
NEEDLES BREAKING
Possible Cause:
Bent, dull or damaged needle.
Solution:
Discard needle, insert new needle. (See Page 28)
Possible Cause:
Wrong size needle for fabric.
Solution:
Insert appropriate needle for fabric type. (Go to www.singerco.com to view the Stitch
Reference Guide)
Possible Cause:
Machine not threaded correctly.
Solution:
Rethread the machine completely. (See Page 15)
Possible Cause:
“Pushing” or “pulling” fabric.
Solution:
Don’t manually push/pull fabric in order to sew, but allow the machine’s feed teeth to
draw fabric under the presser foot as you guide it. (See Page 23)
7.
BOBBIN WINDING DIFFICULTIES
Possible Cause:
Bobbin thread loosely wound on bobbin.
Solution:
Rewind bobbin, making sure that the thread is placed snuggly in the bobbin winding
tension disk. (See Page 13)
Possible Cause:
Bobbin winding spindle not fully engaged, therefore bobbin not winding.
Solution:
Check that the bobbin winding spindle has been fully engaged before starting to wind.
(See Page 13)
Possible Cause:
Bobbin is winding sloppily because thread end not held at beginning of winding
process.
Solution:
Before starting to wind, hold the thread tail (coming out of the bobbin) securely, allow the
bobbin to partially
¿
ll, then stop to trim the thread tail close to the bobbin. (See Page 13)