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Troubleshooting an APF TV Fun


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#1 Nateo OFFLINE  

Nateo

    Stargunner

  • 1,272 posts
  • Location:Buffalo, NY

Posted Mon Jan 21, 2019 12:39 PM

I've been looking to repair an APF TV Fun console I acquired some time ago, and now that Ive put together some decent electronics skills, I thought Id make an attempt. It's based off the ubiquitous AY-3-8500 and the data sheets are readily available.
The issue with it is that the left paddle doesn't appear on screen. Everything else seems to work ok - though everything does seem slightly dimmer than usual. And a little brighter when the right paddle and the screen boarders overlap.
I replaced the electrolytics, and the traced from pin 10, and everything seems a-ok on that front, but the problem remains.
Any ideas?

#2 TheProgrammerIncarnate OFFLINE  

TheProgrammerIncarnate

    Space Invader

  • 14 posts

Posted Tue Feb 5, 2019 10:03 PM

The left bat input goes into pin 12. I would check the potentiometer first, followed by the other components and connections according to the circuit diagram. (pg4) If that doesn't work the problem probally lies within the chip and a replacement would need to be soldered in.






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