Gamma-1 Platform PCB Multicade Help

[fwfa]

I visited an arcade auction the other day and I picked up a nonworking Williams  Multicade. If I knew then what I have researched and figured out now I probably would not have purchased it or at least had let someone beat me out of it as I think I spent too much for what I have.

None the less I am now deep into this machine (cash wise) and I hope to use the parts that are in it, repair them and get a working machine out the other end.  This is strictly for fun and I hope to collect a few more games in the future and I will be learning as I move forward. I loved the Arcades in the Early 80s and I always wanted a Game of my own then and now I can afford one.  Good news, no more living through my old Intellivision  J. Bad news…a fool and his money L

All that said, I need help!  I do not know what I am doing and I am hoping that someone can provide me with a little wisdom.

Here are the facts concerning the parts that are in the machine currently;

Turn on the Game and the monitor, speaker, and sign lights turn on.  No sound (other than a hiss from the speaker). No playing blind that I can tell

Monitor 19” Electrohome G07 CB0 vertical collapse. (Horizontally Mounted) I believe vertical collapse is what has taken place but the line on the screen is about 4” wide and most I have seen on the internet are less than a ¼” wide…so I am not sure

PCB is a Gamma1 Multiwilliams that was sold by the arcadeshop in 2004-2005. I am not sure if this is working or not. When the system is running I can adjust the volume and the Hissing sound increases and decreases. I have checked several places on the board for continuity. One place looked a little burnt but there was still continuity.

I contact Gamma Arcade and the Arcadeshop concerning a schematic and the arcadeshop replied that the company that produced the part did not offer schematics or repairs

Link to the original advertisement

https://web.archive.org/web/20050126091300/http://www.arcadeshop.com/multi-williams/multi-williams.htm

Link to the Pin out

https://web.archive.org/web/20050208145447/http://www.arcadeshop.com/multi-williams/multi-williams-pinouts.htm

Link to the gamma arcade Board Info Rev 1.5

http://gamma-arcade.com/gamma1platform.htm

 Power Supply Standard power supplies for the monitor and the JAMMA. I did test the power to the PCB and it was right at -6 and I could not get it to the -5 as per the pin out link so I purchased a new power supply and I now have -5 to the PCB

My next step?? I was going to see if I could fix the monitor by replacing the necessary parts that I have read about but not until I tried to adjust it properly???  Does anyone have any guidance concerning the PCB?

Thanks for your help in advance….