(Topic ID: 177603)

'54 Gottlieb Mystic Marvel problems

By PittPin

7 years ago


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  • 33 posts
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  • Latest reply 7 years ago by PittPin
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#4 7 years ago

You may need to have credits on the replay unit in order for the game to start. Also check the switch stack that rides the back of the ball gate, these switches often get accidently knocked out of whack when raising and lowering the PF.

- TimMe

#10 7 years ago

On Gottlieb schematics, the switches are shown with the game reset and ready to play ball one, and the machine unplugged (no power).

As for the switch stack on the ball gate that I was talking about, what I mean is that there are one or more switches that get actuated when the ball gate (AKA the ball release) in the ball trough is in the energized position. One of these switches is normally closed and will be opened when the ball gate is energized. When this switch is open, it shuts off all of the start circuits, including the replay button.

If you look at your schematic snippet in post #1, at the very bottom right corner of the pic there is the start ("S") coil. Just to the left of the S coil is a switch marked "ON BALL RELEASE." This is the switch I'm talking about. If that switch is knocked out of whack and is not making contact when the ball gate (AKA ball release) is in the non-energized position, then you'll never be able to start a new game.

- TimMe

#11 7 years ago

You also asked about the score motor. The score motor is a cam assembly with a large top cam that has 3 detents, spaced 120 degrees apart. That's because one cycle of the score motor is 1/3 of a full rotation of the cam. The score motor assembly has various switch stacks spaced at different positions around the perimeter of the cam assembly. These switches are actuated by detents in the cams and by posts protruding from the cams. Each of the switch perimeter locations is identified by number - 1, 2, 3, etc.

In addition, the various "levels" (vertical positions) of the score motor cam assembly are identified by letter - A, B, C, etc. The top cam is the "C" level cam. So a motor switch at "1C" is in the switch stack at position 1, riding the top cam. A motor switch at "2B" is in the switch stack at position 2, riding the post between the top and bottom cams. And so on. The lower left area of your schematic should have a diagram that calls out all of the switch positions and levels used on your score motor.

The score motor has a home position. It must always return to this home position or the game will not work correctly. The home position is where the cam rider for the switch stack at motor 1C is sitting in one of the 3 detents of the top cam. There is a switch on the motor 1C position that is called the runout switch. Whenever this runout switch is closed, it causes the score motor to run. The runout switch is closed whenever the cam detent is not at the 1C position, because then the 1C switch stack get pushed back by the little metal cam rider that rides the edge of the top cam.

An easy way to check that all is well with the score motor is to turn on the game, and then rotate the top cam by hand a few degrees counter-clockwise. This should cause the 1C switch stack to actuate, which will close the motor runout switch. The motor should come to life and run the cam 1/3 turn to the next detent position at 1C. You can do this test a few times to confirm that the score motor is always reliably running itself back to the home position.

If the score motor doesn't move when you rotate it out of the home position by hand, then either you have no power to the motor, or you have a failing runout switch at the motor 1C position.

- TimMe

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