Dear Arcade Controls Fourm members,
I have just obtained a non-working Midway space invaders arcade game. I am really trying to get it back into working order, but sadly I have but a little electronics knowledge. It also does not help that when I search Google that I cannot find hardly any restoration info on the machine, let alone anything directly applicable to my scenario. Any ways here's the deal. I tested the power supply board for voltages, and all but the -5 volts seems fine. The -5 v is reading like 200mV which cannot be correct. I ordered a Cap kit for the Monitor and the Power Supply from Bob Roberts, as well as a new power cord. After the new caps are installed in the power board there is no change on the -5 v but everything else is spot on, well the +18 is reading 17.20 but that's fine. I then proceeded to install a new voltage regulator that is in the -5 v circuit, a 7905C. After the part is installed, there was still no change. I really need to get this sorted out before I even begin to look at the monitor, but the monitor is currently just showing a solid grey screen. On the power supply board there are a few parts that look to have gotten hot in the past, but I need to know their function and if they even effect the -5 v circuit. Could some one please tell me what parts do what, how they can fail, what problems they cause when they do? I believe this information would not only be helpful to me, but also to other beginners. I do know what caps and resistor are, I am talking about the green diode looking things, the round metal things with 8 legs that stand off the board, the disc thing in the middle of the heat sync, that sort of stuff. I think it would also be helpful to have a part diagram that maybe displays the value of the resistors on the board as well if anyone could possibly provide one? One last thing, I connected the monitor up to a kind of home-built test rig, does anyone know the correct plugs for the monitor wires that go to the tube (not the ones that connect to the neck) there are 4 a black one, red, green, and yellow.
I will post a link where I have taken pictures of the board along with other things to do with the machine, I am really looking forward to getting this working.
Thanks in advance,
Noah
Pics:
https://skydrive.live.com/redir?resid=DB065D31B19F9386!925&authkey=!AGvSaE7JToCTVJ4P.S. I was not impressed with the kit provided by Bob Roberts, The pics tell the whole story....
P.S.S. If this thread it not in the correct place/ I have done something wrong please tell me so that I can fix it. I am really looking forward to becoming a member of this great community.
