Moon Patrol adapter problem ( picture )

PYJAMAGROOVE

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Hello everyone! Is is my first post, so I'd like to say hi to all of you, my name is Tobias, age 31, male, crazy about games and arcade!
Now, I've done my first adapter - Moon Patrol to Jamma. Everything works fine, picture, sound etc. Only after few minutes picture starts bending a bit from upwards, then more and more and finally it moves left ( I can see only a half) and gets dark.

After I let the board to cool down, everything goes back to normal and repeats after few minutes.

My guess is, that the video chip gets too hot. I don't know is it the board or my adapter.

Thank you for any help.
 
Sounds as if you may have wired the adapter incorrectly. Make sure that you don't have +12vdc going to a place that requires +5vdc.
 
Thanks for a quick response! I will check my wiring. I've forgot to mention, that I have a digital voltmeter in my cabinet, and it shows 4,7V on this board, not 5,1V as on my other boards.
 
Thanks for a quick response! I will check my wiring. I've forgot to mention, that I have a digital voltmeter in my cabinet, and it shows 4,7V on this board, not 5,1V as on my other boards.

It sounds like you may need to rebuild or replace the power supply board.

4.7V is barely on the acceptable running range for Moon Patrol.

ken
 
It sounds like you may need to rebuild or replace the power supply board.

4.7V is barely on the acceptable running range for Moon Patrol.

ken

Totally agree, 4.7 is low. Doesn't make sense that 4.7 would heat up the any of the chips to the point of failure though.
 
Totally agree, 4.7 is low. Doesn't make sense that 4.7 would heat up the any of the chips to the point of failure though.

It may not be the chips that need to cool down. It may be the connector pins burning. Or the video sync circuit may be acting up with low voltage.

I had a JAMMA game that did that (video problem) when the power supply warmed up. When it first happened, I tried everything. I swapped monitors. I spent hours tracing circuits and working the logic on my bench and never got it to go south. Back in the cabinet, 20 minutes later the horizontal hold had gone south. Back on the bench. Perfect. What was different, the switcher. Replaced it. Bang everything was dead on. Switcher had a transistor that was going south. As it heated up it dropped the voltage. At around 4.6V the horizontal hold signal went out on the board.

Not going to say that this will fix everything, but getting the voltage up is a good place to start.

ken
 
Thanks guys for your input.

Ive tried also everything, played with wires.. So I've figured, that something must be wrong with the board...4,71V, then after a minute 4,74V. Picture slowly bending etc.

So I've tried finally to put it in my vertical Konami wired Zaccaria cabinet. Works PERFECTLY!! Even wormed up! No problems with picture etc. So the board and adaptor must be O.K.
This cabinet has a little tighter connector than the other one. Could looser connector be a problem?...
 
Problem solved. I've cleaned all the connections with the harness and there was some serious monitor adjustments involved. Still operates on 4,75V though. But works! Thanks everyone.
 
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