(Topic ID: 312344)

RAB: no switches work - using Rottendog CPU - why?

By vectorman

2 years ago



Topic Stats

You

#1 2 years ago

Guys,

I have one of the Rottendog CPU replacements, as well as a PS replacement. The game worked fine for a couple years. Then all the switches went dead. Except the test switch. So I can get it into test mode. But then in switch test - nothing. Not a single switch on playfield, cabinet, or undercabinet registers.

I sent the Rottendog back to Rottendog and he tested it and said it works fine. I reinstalled it and same problem. What could be causing this?

Thanks for any guidance.
John

#2 2 years ago

Weird.
The MPU doesn't require 12V for the switch matrix to work as a WPC MPU would.
All of the 6821s are socketed on a RD MPU.
Swap the switch matrix 6821 with one of the display 6821s.
I can't tell you their U## or position locations because it's a RD MPU.

See what changes after the swap.
Pay attention to the "notch" on the end of the 6821s. They must be oriented correctly.

--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
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