You can lube the the contact plate rivets with mineral oil. Normally the spring has 1-3/4 to 2 turns of tension. If you add too much tension, the unit won't step up all the way. Check reset from the first step and the top step.ĭO NOT just add tension to the center coil spring. Clean off the contact plate with alcohol and a non-scratching scrub pad, then manually step up/reset the unit and verify the wipers whizz back to reset when you push in the reset solenoid plunger. The most common problem is someone put grease or something has turned tacky on the rivets on the contact plate. With luck, the fuse blows before any real damage is done. It will get red hot, may burn up or partially short. If your line unit is gunked up, it won't reset all the way, the zero switch won't open and the reset coil will turn into a small version of a toaster. They both stay powered until the line unit resets, then an 'open at zero' switch on the side of the line unit opens and removes the power. When you hit the coin switch, the line unit reset coil and the line unit reset relay get powered. Pedantically, the coils with plungers going into them are called 'solenoids' :-) They should never stay powered for long.