SOURCE: singer sewing machine 7422 bobbin
hi im not an expert on domestic sewing machines bt it seems u maybe have to adjust the teeth on your machine. if you dont know how to do that a machine mechanic will do it for you for a small fee. hope that helped angela
SOURCE: Beeping Sewing Machine
Your problem is most certainly with the buttonhole switch. Firstly: Look if the buttonhole lever, left back of machine, is push up in position. The beeping sound is a warning message. Secondly Remove the light cover, left of the machine, loosen back screw and remove left hand screw completely. Check for a small black electric switch, follow the brown and green elecrtic wire, just back of the light. If you push the BH lever up and down the switch finger should also move up and down. If it stays down, the machine will not work and give a beeping sound. If the switch finger is stuck, push it up with the BH in top position. Hope this will help you
SOURCE: How do I thread my Singer 7422?
I suggest you do a search on youtube on how to thread a sewing machine and choose a video showing a similar machine as there are really only about 3 basic types of machine as regards the threading.
Some of these instruction videos are very good and you will find it much easier than explanations. However-the important thing is that the thread must go between the tension discs by your tension regulator and do make sure you have a good need le in the machine, inserted correctly.
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