Star Wars pcb issue

[Belike]

Thanks for the inputs, I try to swap the avg custom first.
By the way, what is DAC?

[Etienne MacGyver]

Digital Analog Converter 

[Equites]

There will be two for each axis (x,y).  They will be marked AM6012 or DAC312.

[Belike]

Swapped the AVG custom, nothing changed.
Try the DACS will be next step, thanks for the tip.

[Equites]

Swapped the AVG custom, nothing changed.
Try the DACS will be next step, thanks for the tip.

Also check you op-amps (TL082), touch to see if any are burning very hot.  There are a number of these and they fail often.  They are in the final stage by the DACs.

[level42]

....and you can still buy these here:

http://www.reichelt.nl/TL-082-DIP/3/index.html?&ACTION=3&LA=446&ARTICLE=21560&artnr=TL+082+DIP&SEARCH=tl082

and also the TL081 (probably also on there ? Not sure, Asteroids does )

http://www.reichelt.nl/TL-081-DIP/3/index.html?&ACTION=3&LA=446&ARTICLE=21559&artnr=TL+081+DIP&SEARCH=tl081

Ha, just was in the process of ordering some for my Asteroids PCB. They indeed get red-hot to the touch on my first board...but I fried them accidentally...I hope my DACs are still alive because these are a bit more expensive.

[Belike]

I swapped the AVG pcb from a working set, it works fine with this, so the problem has to be in this pcb indeed.
Unfortunately the chips you mentioned to check are not socketed and I dont have/cant use a scope.
Replace all of them would be a pita, so I rather leave to the experts.

[vernimark]

Save the board there. Once i have time to setup a star wars test desk i ll test one of my  boardsets and i can give you a working one and you give me the faulty one. Sorry for my english. It s saturday morning.

[PaulSwan]

I've just finished building a test rig to fix the boards on my Star Wars - what a pain it was :-|

 - Vector power brick + ARII (I was lucky in that I already had original AC side wiring to use).
 - Board side DC & control wiring to twin edge connectors.
 - JAMMA control box for the input switches (service, test, coin etc).
 - Stereo speakers for the sound.
 - Scope lead adaptors for the X-Y out.
 - Z RGB out mixer & inverter for the scope.
 - Dual track volume control knob

I'm still missing the analog input controls on the control box but it's good enough for now.



Paul.

[vernimark]

I have sw wiring, ar2,  power btick and controls so i can do something similar :-)

[Etienne MacGyver]

Nice!

Do i spot a gravis ultrapad in there  ? 

[PaulSwan]

Hehe, yeah, that's the controls for my normal compact JAMMA rig underneath all that Star Wars stuff.
Paul.