Lincoln AC/DC 225 control dials inoperative

Since the rotary switch has positive stops at both ends of its arc, the odds are that either the set screw has fallen out of the knob or that the switch blade has completely broken in half so that the shaft can spin freely. The first is easy, the second requires taking the whole case apart to get at the back side of the switch and replace the switch blade.

Hope this helps,

Rich Waugh

The only way you can get a repair manual is to be a service shop,but what your saying is the dial turns with no resistance.did anyone turn the dial while someone was welding?if so the dial has to be replace,what happens is the contacts inside the unit weld together becuase once the dial is turning it breaks contact then makes contact welding the dial in place.You would not be able to turn the dial.so if the dial turns very easy I would check to see if the dial handle is loose on its shaft.the unit can be taken apart but it just takes a little time.it is a very basic unit with not to many internal parts.good luck,you can fix the problem.