Space Shuttle
Williams, 1984I've seen Vid's mod about replacing the 27 ohm resistors with jumpers and upgrading to Mosfet IRFZ34N's on Sys 3-7 MPU's. Will this mod work for the Sys9 board as well? Has anyone done this mod and noticed a drop in temperature/heat in the backbox?
I don't recall seeing anyone do that to a System 9 board, but I see no reason that it won't work. Another, I think better method is described here:
http://www.pinwiki.com/wiki/index.php?title=Data_East/Sega#Using_MOSFETs_in_the_Lamp_Matrix_Circuitry
The example is a DE MPU, but the same should hold for Williams System 9 and 11.
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Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info
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Marshall, VA