Repair a Singer Sewing Machine. Determine the model of your sewing machine. Look on and under the machine for this information. Visit Singerco.com to purchase a manual if you do not have one. The manual will include schematics, threading diagrams and information on how to use your Singer sewing machine.This information can make it much easier to diagnose and repair your sewing machine.Use the handwheel to make the needle rise and fall.isit Singerco.com to purchase a manual if you do not have one. The manual will include schematics, threading diagrams and information on how to use your Singer sewing machine. This information can make it much easier to diagnose and repair your sewing machine. Use the handwheel to make the needle rise and fall.