Dlsmith
Member
Looking for some input on trouble shooting a Galaxian PCB.
Where I am at:
I'm teaching myself how to repair arcade PCB Boards. I have purchase a Galaxian PCB as my test project.
I built a test bench with an CGA/EGA/YUV/RGB to VGA arcade converter to make the process easier.
The PCB had the ROM mother board and I converted it to the single 27128 Eprom Modification.
On the reset pin 26 of the CPU I'm getting a high signal but it stays there. when I hit the reset button, it's high, briefly low, then stays high. According to my manual, it should start high, then stay low.
Does anyone have a suggestion of were to start looking.
Also, I have +5vdc at the CPU and the ROMS.
Attached are pictures of my PCB and the screen I'm getting now.
Thanks for any suggestions.
David
Where I am at:
I'm teaching myself how to repair arcade PCB Boards. I have purchase a Galaxian PCB as my test project.
I built a test bench with an CGA/EGA/YUV/RGB to VGA arcade converter to make the process easier.
The PCB had the ROM mother board and I converted it to the single 27128 Eprom Modification.
On the reset pin 26 of the CPU I'm getting a high signal but it stays there. when I hit the reset button, it's high, briefly low, then stays high. According to my manual, it should start high, then stay low.
Does anyone have a suggestion of were to start looking.
Also, I have +5vdc at the CPU and the ROMS.
Attached are pictures of my PCB and the screen I'm getting now.
Thanks for any suggestions.
David