Yes you can get DC voltage by first removing the unit, CAREFULLY at your own risk plug it in, break out the DVM. Work from the line cord back, it is very simple and their are schematics on line. It has been years (5+) since I had reason to trouble shoot mine, so I can't give specifics. But most places that sell parts will schematics with voltages marked at several test points.
If you are not comfortable with electronics either send out for repair or buy new.