(Topic ID: 278466)

Miss America 75 .... pls help with diagram

By pjjj

3 years ago

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  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 3 years ago by baldtwit
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#1 3 years ago


After repairing a dozen+ EM pinballs or so, i thought.. lets give a bingo a throw...
An "almost" working MA75 voor €100, all included. I think thats about €1/kg.

A lot is working now. She starts, rattles, flashes and humms...... As Miss America should...
she won't stay quiet ... As Miss America should... ( think she does not finish her reset cycle)....

But thats the problem, it's not Miss America, it's MISS AMERICA 75....
No diagram to be found on IPDB or in this forum (yet).
I have the 46 pages manual of MA75 though... plus some update pages on the mixer units...

so please, anyone,
A diagram of MA75......needed.
I can offer free beverages and cupcakes on delivery. (Netherlands, Sealand)

Any help appreciated,


#2 3 years ago


#3 3 years ago

Thanks !

Found it.

And the first flaw.....
I'm missing contacts on CU CAM#4..(TOP-contact).. so the coin-switch does nothing.

Is a pic avaialble how it should be ..? (there should also be something like a jumper to choose between single and multi-play per coin....)

Short-clamping the contact (crocodiles) increases the credit relay with about 4 points (lots of game-noise) on every press of the coin-door startbutton....

Is this normal..??
0b31193e-7d41-407c-83cd-d071834de82e (resized).jpg0b31193e-7d41-407c-83cd-d071834de82e (resized).jpgCU-cam4 top (resized).pngCU-cam4 top (resized).png

#4 3 years ago

can't tell from the picture angle what wires are connected, but you probably aren't missing switch blades.

there's four sets of switches on the cam 4. The top set is SPDT, so it has a moving middle blade with blades above and below it. The below blade should have wire 95-50 on it.

the wires attached to lugs on the top of the stack are for configuring the coin behavior of the machine. MA75 has these options:

1] one coin = one cycle of the machine - the bottom blade of the SPDT should be jumpered to wire 18-11
2] one coin = one cycle + 4 credits added. Bottom blade jumpered to 15-5
3] 2 coins needed to produce either of the above. wire 25-30 on one of the top lugs jumpered to either 18-11 or 15-5

when you have credits on the replay register, the coin switch shouldn't do anything.

the SPDT top blade has wire 14-5 on it. It's job is to trip the tilt trip relay if the coin switch is closed when the timer cams lift up the cam 4 switch stack. It's there to help prevent people from fishing a coin on a string to toggle the coin switch. If it annoys you, you can disable the tilt by misadjusting the top blade permanently open.

there's no guarantee an operator jumpered things the way bally intended. As long as closing the coin switch causes either the start relay or multi-play relay to power, that's the end goal for options [1] and [2] above. Option [3] the coin switch just powers the alternator relay which in turn steps the alternator unit once.

flipper games usually had all this stuff configured with plugs. For whatever reason, the bingos almost always required soldering wires to set the coin behavior the way the operator wanted it.

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