Arcade Collecting > Restorations & repair
Galaga Machine project - It's now ALIVE!
Mauzy:
I would only swap the processor ICs to the second CPU board. Then if it gives you different results, swap the chips one by one (i.e. swap a chip, test, swap, test). You may find that something relatively easy is wrong with the first board, fix it, and sell it to start the recoup process.
If you don't get different results, then its either your video board, or you got REALLY lucky when you bought that CPU and you bought something with the exact same problems.
Also, Check your voltages!!! RayB usually has halfway decent advice...;D
Cyberflexx:
--- Quote from: RayB on October 30, 2008, 12:54:36 am ---
--- Quote from: Cyberflexx on October 26, 2008, 04:55:05 pm ---I didnt check my voltages yet. I may do that later tonight..
--- End quote ---
Have you done that yet? ;)
--- End quote ---
The only voltage that I had time to check was the main capacitor on the CPU board. It is getting 5 volts. I am unsure where to check all of the other volatages..
I do have a switching power supply that I am going to install. It is made by Pesco. I verified that it works since it was given to me when I was working on my NeoGeo. I just dont know how to put it in the Galaga quite yet.
The NeoGeo I restored a couple years ago had a bad power supply and I installed a ATX power supply from a computer and it seems to work well.
RayB:
Measure the +5 off the board, near where it comes in from the board harness. And also look up whether or not this board requires a little more than 5.0 . Sometimes errors on boot up are simply due to voltage being too low. But I am not personally familiar enough with original Galaga boards to know. (My bootleg reports RAM errors if voltage isn't high enough).
Would be a shame to find out that's all it was, after all your fiddling with ICs, etc, but I had to ask. Measuring voltage to the board is the #1 first thing to check and make sure is correct, before anything else.
Cyberflexx:
--- Quote from: RayB on October 30, 2008, 03:30:45 pm ---Measure the +5 off the board, near where it comes in from the board harness. And also look up whether or not this board requires a little more than 5.0 . Sometimes errors on boot up are simply due to voltage being too low. But I am not personally familiar enough with original Galaga boards to know. (My bootleg reports RAM errors if voltage isn't high enough).
Would be a shame to find out that's all it was, after all your fiddling with ICs, etc, but I had to ask. Measuring voltage to the board is the #1 first thing to check and make sure is correct, before anything else.
--- End quote ---
I am getting + 5 Volts to the board for sure. I did not have time to do any power adjusting last night.
Cyberflexx:
IT'S ALIVE!!!!!!!!
Well, I was able to play Galaga tonight. I fixed it. Board level repair and a bit of luck.
I ordered a galaga PCB from a guy on ebay for 16 bucks that had missing parts to it. 1st thing I did was swap out the video board and all the IC's. Plugged it in and same results as before. Tonight I did the same thing but with the CPU board. In the process I accidentally broke a pin on the 53xx chip @ 4h posistion on the board. I had to take a jumper wire and tack it to the back side of the socket and solder it to the very very small section of broken pin on the processor.
Every once in a while the screen will flicker very quickly, so i might have a loose wire somewhere or my monitor is slowly drifting away. The red color needs adjusted some, but other than that, I am very happy!
Thanks everyone for all your help in troubleshooting my board..
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