Arcade Collecting > Restorations & repair
Star Wars - fully working!
Level42:
Some Flukes do this too, but you can always override it. It's those pushbuttons type meters. However, I've always used the regular "dial" setting Flukes for my work because they are the easiest in every day use.
Spyridon:
--- Quote from: Kevin Mullins on April 23, 2009, 01:57:06 pm ---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 ---
Okay, I checked again. x-out is fluctating. y-out is steady at 13.44.
"then check the X and Y amplifiers on the GAME board."
Where are the X and Y amplifiers and how do I check them?
Level42:
Sorry, I forgot: can you play "blind" with this PCB set now ? I mean can you credit it and start a game and hear the sounds ?
Also, you measured the X and Y on the AVG board (the one on the PCB game-set) right ? With or without the monitor connected ?
The amplifiers on the game board are the circuits behind the DAC converters. Look up sheet 14A in the schematics drawings and you find the Y- (and X-) axis outputs. I guess it would be possible to do a bit of a compare between the X and Y axis points to see if you can find a bad IC.
Game PCB board repair can be very difficult. I struggled with my Centi board but managed to repair it. However, a SW boardset is a pretty complicated set of boards.
Spyridon:
--- Quote from: Level42 on April 26, 2009, 06:10:13 pm ---Sorry, I forgot: can you play "blind" with this PCB set now ? I mean can you credit it and start a game and hear the sounds ?
--- End quote ---
Game is playing blind
--- Quote ---Also, you measured the X and Y on the AVG board (the one on the PCB game-set) right ? With or without the monitor connected ?
--- End quote ---
I measured it on the AVG board with the monitor connected
Level42:
OK, what do the X and Y do without the monitor connected ?
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