(Topic ID: 297612)

Gottlieb System 80B Switch Matrix ROW not Working Monte Carlo

By jk

2 years ago



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#2 2 years ago

I would suspect the 7404 at Z11.
A logic probe would help you know with certainty.
You can also "diode test" that chip with a meter.

Meter on diode check.
Board out of game or connectors removed.
Red on lower left pin.
Black on other pins one at a time.
.4-.7 should be the reading on each pin except the upper right pin.

--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

1 year later
#6 1 year ago
Quoted from apc7654:

Can I use the diode test for Z13 and Z14?

You sure can.
Diode testing works on all 74xx chips.

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

#8 1 year ago

Connectors are always suspect on System 80 games. Glad it is working.

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

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