Arcade Collecting > Pinball

Roadshow switch issue - Resolved

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Zero_Hour:
Well, I received a Roadshow yesterday, and it is in immaculate shape. Best play field I've ever seen on one in person, and the Red and Ted heads and Bulldozer blade are all unblemished as well, so I'm pretty happy with the purchase. The machine does have an issue, and hoping for any insight into troubleshooting it.

When running a test at startup, the machine says that switches 31-35 need to be checked. When I go into the Switch Edge Test, they are indeed all unresponsive, as are switches 36-38, so an entire column of the switch matrix seems to be out.

My question is where is the best place to start trying to remedy this?
I've rebuilt flippers and pop bumprs, and even replaced a few blown capacitors on my AFM, so I'm not afraid of working on the Roadshow, but this is new territory for me, and I'd like to attack the problem in the most logical way possible.

smartbomb2084:
Check the Switch Matrix connectors at the bottom of the CPU Board (J207 Pin 3-Green and Orange wire) for hacks or battery corrosion...Look Closely...

Next...check U20 (Pin 16) on the CPU...

Zero_Hour:
Thanks for the response.

Checked the J207 connectors. Wires look good to the connector, no broken pins on the board, no corrosion to be found, board looks to be clean of any soldering hacks.
U20 on the CPU is a socketed IC. Chip was seated, no corrosion, signs of damage to the chip or the board.

smartbomb2084:
When you put the game in SWITCH EDGES Test are all of the Column 3 switches stuck CLOSED or are they OPEN and unresponsive?

If stuck CLOSED... remove Connectores J207 and J209 from the CPU and see if the Column goes out while in SWITCH EDGES Test.

If OPEN... check for a break in the Green-Orange wire  (J207 Pin 3)  to the switches in the column.

Use a DMM not just your eyes...

ChadTower:

Definitely use the DMM and not your eyes.

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