WingKing
Member
A little background info: I'll just preface this post by saying that I've never worked on Williams games before. I don't have a ton of knowledge in this area, but I can follow instructions if you can explain to me what I need to do. I have read through a lot of older posts on Defender repairs and looked through the manual.
I purchased 3 project Defender cabs not too long ago and I'm just getting around to consolidating all the working parts into one cab. I have 3 complete board sets. Only 1 monitor is working.
I've swapped out different boards and trying different combinations of things and so far I'm not having any luck. I'm starting to think that maybe I don't have 1 fully working set of pcbs among the 3 sets I was given. Or maybe the wiring in the cab I'm using is shot.
Issue: When I power the game on I hear the sound that I believe you're supposed to hear. The monitor is turns on and displays a white/gray color and has some rolling (I think it might also turn to a reddish color after a while). The game does not coin up or play blind. The power supply has the +5v +12v and -5v lights lit up. All 4 lights on the ROM pcb stay lit. I can do a test of the sounds and adjust the volume.
Here is where my inexperience comes into play. I'm trying to test voltages, but I can't figure out where/how to do it. I found the location of all the voltages in the manual. If I stick the leads of my multi-meter down into the openings on the connector, it doesn't make contact or get a good enough connection to read anything due to the way the wires are inserted into the connectors. Is there somewhere else I should be testing voltages? If so, could someone please give instructions on where to do it in the most plain way possible?
I purchased 3 project Defender cabs not too long ago and I'm just getting around to consolidating all the working parts into one cab. I have 3 complete board sets. Only 1 monitor is working.
I've swapped out different boards and trying different combinations of things and so far I'm not having any luck. I'm starting to think that maybe I don't have 1 fully working set of pcbs among the 3 sets I was given. Or maybe the wiring in the cab I'm using is shot.
Issue: When I power the game on I hear the sound that I believe you're supposed to hear. The monitor is turns on and displays a white/gray color and has some rolling (I think it might also turn to a reddish color after a while). The game does not coin up or play blind. The power supply has the +5v +12v and -5v lights lit up. All 4 lights on the ROM pcb stay lit. I can do a test of the sounds and adjust the volume.
Here is where my inexperience comes into play. I'm trying to test voltages, but I can't figure out where/how to do it. I found the location of all the voltages in the manual. If I stick the leads of my multi-meter down into the openings on the connector, it doesn't make contact or get a good enough connection to read anything due to the way the wires are inserted into the connectors. Is there somewhere else I should be testing voltages? If so, could someone please give instructions on where to do it in the most plain way possible?
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