Demolition Man
Williams, 1994You're currently viewing posts by Pinsider fabsj82.
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Hey guys. I just bought a Demolition Man with a non working DMD. While testing voltages on the DMD I looked away for a split second and bridged the 62 volt pin to the 12 volt pin. Optos went out and the game started launching balls continuously. F116 fuse was blown. I turned the game off replaced the fuse and it blew again right away on start up. I pulled the board and BR5 bridge seems to be fine. Where should I be looking next? U20 chip?
Quoted from DumbAss:pull J116, J117 and J118 and if the fuse still blows it's on the board.
Thanks! Pulled J116, J117 and J118 and the fuse did not blow on power up. Do you have a recommended order to go in to start narrowing down the culprit?
Quoted from Pin_Guy:Does your 12V LED on the power board light?
All LEDs match my Getaway except LED3 is lit solid and light on DMD driver board is off.
IMG_20200224_182019 (resized).jpgQuoted from Pin_Guy:Try just leaving the DMD display disconnected
That was the first thing I tried. Fuse blew right away
Quoted from Pin_Guy:my guess is J118 will blow the fuse.
J117 is my fuse blower.
Quoted from Pin_Guy:disconnect J606
Disconnected j606 and plugged in j117. Fuse did not blow. What are the chances I blew up my display as well? Of course I had my one known good one in there at the time.
Quoted from Pin_Guy:Babcock driver PCB; if you have a Cherry PCB board
IMG_20200224_193923 (resized).jpgQuoted from Pin_Guy:I have no idea
Lol. Thanks a ton @Pin_Guy I really appreciate all your help. I'll take this as a win for the night. I can start a game, flippers are acting weird but I should be able to take it from here. Thanks again!
IMG_20200224_192529 (resized).jpgQuoted from BC_Gambit:I need to buy better test leads for my multimeter.
Definitely don't rely on notches in the probe and don't have three kids running around the machine while you are using it 
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Green Bay, WI