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Computerized sewing machines, like the 7422, don't usually need oiling. They used sealed bearings. The manual for the 7422 does not show any oiling/lubrication points.
There is two distinct parts, the treadle part you operate with your feet and the sewing machine itself. They are joined by the belt. Both parts need lubrication with light machine oil. Remove the belt and lubricate the treadle, then test it runs smoothly. Then clean and lubricate the sewing machine making sure that runs smoothly using the handwheel. Then put the belt back on.
Is there power, does the sewing bed light come on? If so there is probably a fault with the pedal. If you are practical you can open the pedal and fit a volt meter across the terminals to see if the voltage increase when the pedal is pressed.
make sure the foot pedal cord is pushed in correctly
rethread the machine top & bobbin
clean under the needle plate where the feed dogs are for lint
also clean the bobbin are for lint or loose threads
change needles
Faboulous machine the 401 and the best machine ever made, in the UK if I remember the two red wires go to the right hand pin and thw two blacks go to each terminal, when you rewire the plug which is fidly undo the stop motion, when you plug the machine in if it runs on without touching the foot control change the two black wires over, to rewire the foot control there are only two wires, you can't go wrong.
Your first port of call should be the Singer dealer from whom you bought the machine, it will be under warantee and you don't want to risk breaching the conditions by fiddling around yourself.
They have a duty of care to customers, and would be crazy to give poor service on a new machine.....phone them, outline the issues and arrange a time to meet with them (with the machine) to address the problems..perhaps they offer a familiarisation lesson, as many dealers do, that would also be of enormous benefit to you with a new machine and is a service we provide for all our customers to get them started, so they get maximum benefit from the beginning.
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