Asteroids G05-802 Test Image Question: What Am I looking At?

mhanlen1

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Asteroids G05-802 Test Image Question: What Am I looking At?

So I've been working on my Asteroids this weekend and have done the following:

From Bob Roberts...

G05 Cap kit with Xistors
Asteroids Cap Kit
Big Blue Replacement
AR board rebuild kit
Replaced all Power Supply Fuses

So after shotgunning all of this, it behaves and looks exactly the same way as it did prior. While it may be good preventative maintanence, it got me no further to a working cabinet. Right now I get the spot killer image with blinking player buttons. I'm pretty sure I have a board problem, but there may be another issue too. I've searched the net and had trouble finding what the image on an Asteroids is supposed to look like if you have the spot killer and flip the test switch.

This is what I get. Does this look normal? Or should the image look different? Anyone have a picture to compare? If I move the pots on the PCB it basically moves this square around in the left lower quardrant only.

4396446786_6178854123.jpg

4395682913_14e6a2b82c.jpg



I'm going to have to most likely find a working board or get mine fixed, but I'd like to know if my monitor may need adjustment too. By the way I replaced all 4 transistors on the G05.
 
You need a known working board to diagnose a monitor and a known working monitor to diagnose a board.

Right now I'd say you have a problem with your DAC's....
 
In the X/Y section of the board, you'll have two DAC's (Digital-to-Analog Converter's) If they go bad, they can cause problems like this. But other things can cause problems, too. If you have an o-scope handy you can check on the board to see if you have a good signal there before the DAC's...
 
Googling DAC was useless but I searched here for Asteroids DAC and found some info. I see coinopchips has them, but since I'd just be shotgunning it yet again, maybe it's best to get my board repaired. I have no test equipment and no spare parts around, but at least your info leans toward a board issue instead of a monitor problem... which is what I've been thinking anyway.
 
You at a minimum have a board problem, and as Mod has said it looks like a DAC problem.

The test pattern should look like this...

Please keep in mind that this pic is an asteroids deluxe.

101_0143.jpg
 
You at a minimum have a board problem, and as Mod has said it looks like a DAC problem.

The test pattern should look like this...

Please keep in mind that this pic is an asteroids deluxe.


So even if you have a spot killer, when you flip the test switch- it's supposed to resemble this? Gotcha... that's what I was wanting to know.
 
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