Arcade Collecting > Restorations & repair
Star Wars - fully working!
Spyridon:
--- Quote from: Level42 on June 30, 2009, 04:42:18 pm ---I'm sorry, since my education was in electronics I keep assuming some "basic" things to be known by all collectors. Just my fault....
The DAC's are Digital to Analogue Converts. They convert a digital signal into an analog signal and nothing else.
The Op-Amps Amplify the signals so they are strong enough to drive the monitor. Let me check the schematics....
--- End quote ---
Thanks for the explanation. I don't have a background in this but I'm trying to learn. Right now I'm reading this:
Spyridon:
--- Quote from: Level42 on June 30, 2009, 04:54:00 pm ---I've included the page of the schematics. To the left you see the DAC's. The amps are all the triangle shaped figures. Note that some of these are in the same IC ! (Those IC's have f.i. 4 amps in one package)
--- End quote ---
Excellent! I was able to follow most of that. I did locate the Amps and I tested each pin with my DMM. Here are the results:
As you can see, there are definitely some outliers on 9 B/C. The good news, is that this is also part of the y-axis which is the one that was not correct.
Level42:
Did you measure AC or DC voltage?
I assume to ground ?
Spyridon:
--- Quote from: Level42 on July 01, 2009, 05:58:41 pm ---Did you measure AC or DC voltage?
I assume to ground ?
--- End quote ---
Yes, measured to ground. My DMM only has one setting for voltage regardless of AC or DC.
ChadTower:
--- Quote from: Spyridon on July 01, 2009, 09:14:50 pm ---My DMM only has one setting for voltage regardless of AC or DC.
--- End quote ---
Ew! Replace that!
There are times you want to measure the AC on a DC circuit.
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