The Dual H-Drive motor board controls two motors with 4 signal from the driver board.
Car 1 - direction and enable
Car 2 - direction and enable
You can test the board by grounding the direction and enable pins for one of the cars.
If you have a RoadShow, the identical board is used in that game too, allowing you to swap boards and isolate to the the Dual H-Driver board or Driver board.
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Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact ... for board repairs
http://www.PinWiki.com - The Place to go for Pinball Repair Info