(Topic ID: 289547)

Gottlieb Mars System 80 MPU Troubleshooting

By Knxwledge

3 years ago


Topic Heartbeat

Topic Stats

  • 16 posts
  • 3 Pinsiders participating
  • Latest reply 3 years ago by Knxwledge
  • Topic is favorited by 1 Pinsider

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#8 3 years ago

Those mods are all factory made.
They update the MPU to use a single 2716 vs dual 2708s as found in the first few games.

www.PInWiki.com has a discussion about this.


Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
http://www.PinWiki.com/ - The new place for pinball repair info

#10 3 years ago

You need special equipment to test 6532 chips in circuit.

Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
http://www.PinWiki.com/ - The new place for pinball repair info

#12 3 years ago

Not a bad ROM. ROMs either work or they completely fail.
Sound isn't working because you have the driver board out of circuit and all sound signals go through the driver board.
Clip the ground wire on the locked coil so you can connect the driver board again.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/Contact ... for board repairs
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#14 3 years ago
Quoted from Knxwledge:

Would you happen to know which of the chips (Z1-Z5) I need to do on Mars for the "thunk cure"?

It depends on which coils are thunking.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/Contact ... for board repairs
http://www.PinWiki.com - The Place to go for Pinball Repair Info

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