The blue arc is *twice* the powering voltage due to the EMF that (Easy to see when the score motor rotates!) When the motor turns off, the score motor home switch gets a "blue arc" every rotation of the score motor. Because of the score motor's electro-motive force (EMF) To a "home" position every 120 or 180 degrees. This switch is what turns off the score motor when it rotates Games the "home" switch is usually on switch stack #1. On Gottliebs usually at 1C or 4C, on Bally and Williams Check the score motor's "home" switch.Score motor stops at an exact home position and doesn't "over run", The purpose of this "brake" switch is to make sure the On the score motor that has *no* wires attached to it!) is hitting the metal If a Gottlieb game, make sure the score motor "brake" switch (a single switch.On games with score reels too), because the game cannot reset the stepper to the zero position. If a stepper unit does not reset, the score motor can continue to run (actually this can happen If the game does not have score reels, see the Stepper Unit section.If either of the two "zero position" switches on any score reel is out of adjustment, If the game has score reels, see the Score Reel section.See the Reset Bank section (but make sure the game has credits.Try the coin door start (replay) button.There may not be 30 or 50 volt power (blown fuse or bad fuse holder), or If the score motor does not turn the game will never start. (On Gottlieb games there is a 'home' position every 120 degree, onīally & Williams games home is every 180 degrees.) Lift the playfield and manually spin the score motor a bit.ĭoes the score motor turn on and move to the next 'home' position? It should.The game to "light up", thus enabling the Lock relay. Remember on many 1970sīally and Williams games you must press the left flipper button for Verify the power switch is functional (if it has one, pre-1967 games generally don't.).The game will never do a full reset/start. Remember if score reels cannot go to zero, This allows you to see if the game is able to reset the (Optional) Manually set the player one score reels to anything other.Make sure coin door switches are not stuck closed!.Check that there are credits on the credit wheel.Just inside the coin door opening that attaches the coin door to the bottom relay panel. Make sure the coin door is plugged in (especially if a Gottlieb game).See the Check Fuses section.Ĭheck the fuse holders too, especially on Bally games. Multi-meter (DMM) on the input side of the transformer. Thirty year old (or older) power cords can easily have breaks in them.
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