Hey guys (and especially you Omega Man!) any help here is very much appreciated...
I picked up a free particle board box full of leaky old batteries and wires mixed with circuit boards better known as: Omega Race. I had fixed one a few years ago so am trying to tackle this one myself too. The story so far...
1. Cleaned the boards
2. Replaced all 14 rams installed 11 new sockets
3. Replaced S1, R1, PR1 with socketed - 741LS245, 74LS32, 74LS04
4. Jumped about 20 bad traces from the various RAMs
5. Checked the voltages at the power supply
At power on:
1. Enters game mode with graphics garbled/squished down to about 1/4" on the bottom right of the screen but just big enough to tell you are firing, moving, etc. Moving the pots on the main board moves the graphics L/R or U/D but still just a thin line about 1/4" high.
2. There is no sound but the amp seems good (touch back of it and get loud hum in speakers, can raise & lower with pot adjustment)
3. Test mode is not flashing any LED errors (It was flashing 10,11,12,13,14 when I started this project so getting this far is huge!)
So I guess I have 2 issues to tackle - no appropriate sounds and the squished video. Any thoughts or suggestions?
:0)
I picked up a free particle board box full of leaky old batteries and wires mixed with circuit boards better known as: Omega Race. I had fixed one a few years ago so am trying to tackle this one myself too. The story so far...
1. Cleaned the boards
2. Replaced all 14 rams installed 11 new sockets
3. Replaced S1, R1, PR1 with socketed - 741LS245, 74LS32, 74LS04
4. Jumped about 20 bad traces from the various RAMs
5. Checked the voltages at the power supply
At power on:
1. Enters game mode with graphics garbled/squished down to about 1/4" on the bottom right of the screen but just big enough to tell you are firing, moving, etc. Moving the pots on the main board moves the graphics L/R or U/D but still just a thin line about 1/4" high.
2. There is no sound but the amp seems good (touch back of it and get loud hum in speakers, can raise & lower with pot adjustment)
3. Test mode is not flashing any LED errors (It was flashing 10,11,12,13,14 when I started this project so getting this far is huge!)
So I guess I have 2 issues to tackle - no appropriate sounds and the squished video. Any thoughts or suggestions?
:0)


