Singer 7640 - Page 36

2
4
36
Troubleshooting
TROUBLESHOOTING AND MAINTENANCE
14. NEEDLE THREADER NOT WORKING
(for models with built-in automatic needle threader)
Possible Cause: Needle not in correct position.
Solution: Raise needle to its highest position by turning hand wheel toward you. (See Page 16)
Possible Cause: Needle inserted incorrectly.
Solution: Needle all the way up in needle clamp (See Page 28)
Possible Cause: Needle is bent.
Solution: Remove bent needle, insert new needle. (See Page 28)
Possible Cause: Hook pin damaged.
Solution: Needle Threader needs replacement; contact authorized SINGER
®
service center: Visit
www.singerco.com.
15. LOUD NOISE WHEN SEWING
Possible Cause: Thread not in take-up lever.
Solution: Rethread the machine, making sure the take up lever is in its highest position so thread
goes in the eye of the take up lever – turn machine hand wheel toward you to raise the take up
lever to its highest position for threading. (See Page 15)
Possible Cause: Thread path obstructed.
Solution: Check that thread is not caught on the thread spool or behind the spool cap. (See Page
15)
16. MACHINE WILL NOT RUN
Possible Cause: Bobbin winding spindle is engaged when you try to sew.
Solution: Disengage bobbin winding spindle. (See Page 13)
Possible Cause: Power cord and/or foot control not plugged in correctly.
Solution: Make sure power cord/foot control are correctly seated in machine and power supply.
(See Page 12)
Possible Cause: Wrong bobbins being used.
Solution: Use only SINGER
®
branded bobbins that are same style as those that come with
machine. (See Page 11)