Why doesn't the needle go down? - Sewing Machines

1. If the machine motor is running you can see if the bobbin winder is functioning. If so then you need to tighten the hand wheel lock.
2. If it doesn't work try loosening the screw on the hand wheel lock. 3. Try to tighten the wheel lock now.
4. Now, tighten the screw.
5. If it still isn't functioning you may need to loosen the motor and replace the belt.
6. Belt. Remove old belt. Put new one on while motor is loose. Tighten the motor while you keep the machine running at a slow speed. As you tighten the motor there will be a point the motor speed rises the most. Tighten the motor there and recheck afterwards.