Arcade Collecting > Restorations & repair
Star Wars - fully working!
ChadTower:
Ah, different test point. I usually do it at the test points in the AVG section. You don't even have to have the monitor to do that.
Spyridon:
--- Quote from: ChadTower on April 23, 2009, 11:13:34 am ---
Ah, different test point. I usually do it at the test points in the AVG section. You don't even have to have the monitor to do that.
--- End quote ---
I used the test points on the AVG board.
Kevin Mullins:
--- Quote from: Spyridon on April 23, 2009, 12:47:55 pm ---
--- Quote from: ChadTower on April 23, 2009, 11:13:34 am ---Ah, different test point. I usually do it at the test points in the AVG section. You don't even have to have the monitor to do that.
--- End quote ---
I used the test points on the AVG board.
--- End quote ---
I usually start there too and work my way out towards the monitor..... but it was the voltage findings portion that I really should have made note of.
--- Quote ---The correct voltage should be in the +0.5 to -0.5 volt range (basically zero volts).
The voltage will fluctuate because of changing deflection signals. If the measured voltage
is between 5 and 15 volts (positive or negative), then check the X and Y amplifiers on the
GAME board. Also check for broken potentiometers on the game board.
--- End quote ---
And of course there will be slight variances whether the game is in "play" mode or "test" mode. Test mode will generally give more stable voltages and not fluctuate near as much.
Spyridon:
--- Quote from: ChadTower on April 23, 2009, 09:27:27 am ---
Those wouldn't happen to be DC measurements, would they?
--- End quote ---
My DMM has one setting for both AC and DC measurements. The meter automatically adjusts to the correct setting.
ChadTower:
--- Quote from: Spyridon on April 24, 2009, 10:21:59 am ---My DMM has one setting for both AC and DC measurements. The meter automatically adjusts to the correct setting.
--- End quote ---
Ew! What if you want to check for AC ripple on a DC circuit?
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