Asteroids Game PCB - No Y output, help needed with the fix
Hello! After completely rebuilding my 19v2000 deflection board (the journey is/was captured here: http://forums.arcade-museum.com/showthread.php?t=137243) I found that my asteroids PCB was not sending a Y signal. The game worked when I got it, but loose connections on the deflection board were causing the monitor to turn on and off. I left it on for a couple hours after wiggling the deflection wires to get the display on and playing a bit. After returning to it, it was completely blacked out, but playing blind. After my rebuild and cap/transistor/pot kit install I checked the Y signal from the board.... None!
My symptoms:
- Spot Killer on
- Game plays blind with all sounds working
- Thin horizontal line and bright center dot visible, with action visible along it
This seems to jive with the repair encyclopedia here (except for the vertical part, mine is horizontal):
Problem: Display only visible in a very narrow vertical band in centre of screen, some activity can just be seen in the band (revision 04 board).http://www.ionpool.net/arcade/asteroidtech/asteroidsrepair.html#V11
The fix is listed as **Fix: TL082 op amp at C12 had been removed, as well as the two capacitors at C98 and C119 (220 pf radial lead epoxy dipped 100V Mica capacitors). Replaced.**
How do I replace the TL082, and where can I get one? Could anything else be the issue? The voltage regulator at VR2 looks suspect, but how do I test it? Pics:
Thanks!!
Hello! After completely rebuilding my 19v2000 deflection board (the journey is/was captured here: http://forums.arcade-museum.com/showthread.php?t=137243) I found that my asteroids PCB was not sending a Y signal. The game worked when I got it, but loose connections on the deflection board were causing the monitor to turn on and off. I left it on for a couple hours after wiggling the deflection wires to get the display on and playing a bit. After returning to it, it was completely blacked out, but playing blind. After my rebuild and cap/transistor/pot kit install I checked the Y signal from the board.... None!
My symptoms:
- Spot Killer on
- Game plays blind with all sounds working
- Thin horizontal line and bright center dot visible, with action visible along it
This seems to jive with the repair encyclopedia here (except for the vertical part, mine is horizontal):
Problem: Display only visible in a very narrow vertical band in centre of screen, some activity can just be seen in the band (revision 04 board).http://www.ionpool.net/arcade/asteroidtech/asteroidsrepair.html#V11
The fix is listed as **Fix: TL082 op amp at C12 had been removed, as well as the two capacitors at C98 and C119 (220 pf radial lead epoxy dipped 100V Mica capacitors). Replaced.**
How do I replace the TL082, and where can I get one? Could anything else be the issue? The voltage regulator at VR2 looks suspect, but how do I test it? Pics:
Thanks!!
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