What just happened?

Mr Do

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I just picked up a mint Space Duel cocktail that looks like it came out of the factory. It worked fine, it was on for about 7 minutes at the location I bought it from.
I brought it home, and turned it on. Hit the select button to start playing, (beautiful picture came up) and then lights out. I checked and 2 fusses blew on the power brick.
The F4 and F5 blew and are 4A 250V Slow Blow.
What I pulled out of the brick were 10A 32V.
I disconnected the monitor and put new fuses, and the same thing happened.
What is going on? I need some help. Was I duped?
 
'Hot' unit

Other than a wire shorting to ground (moved during transport?), you may have a unit that was a 'hot chassis' that had a missing isolation tranformer.

Was the outlet grounded at the place you bought it from????

Just a thought....
 
Well, first measure the AC voltage between the transformer side of both fuses. it should be about 36vac.

The voltage then goes thru the fuses to pins 6 & 7 of J5. In fact, if you unplug that P5 connector, the fuses probably won't blow.

It then goes to the ARII board, P9 pins 4 & 5. It goes through a bridge rectifier circuit where it is converted into +22vdc and -22vdc.

Most likely, you have a problem with that rectifier circuit. You can connect P5 on the brick and unplug P10 on the ARII to confirm that the problem is on the ARII (the fuse still blows)...
 
trouble shooting

I may have just found the problem.
The ARII board was "off the mounting track and probably touching components and causing a short. The screw that holds it in is missing or touching something.
I see it but can't fix right now, I have somewhere to be.
I will let you know later.
David
 
I found the problem.
The ARII board was off the track and shorting the game, blowing the fuses.
But once I mounted it back making sure all was mounted and postioned correctly, the game works great except no sound.
ARII or volume pot???
David
 
I always just check the inside for loose wiring after moving a game. You never know if anyone has taken a screw loose somewhere that might cause a board to come loose and short out components...
 
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