DOT on my Asteroids

My Asteroids cabinet was in very good condition. Including the original control panel overlay. Finding a working Asteroids can be very rare and this one wasn’t working either.
As with so many Atari games, first start checking the power supply and then the Audio/Regulator (AR for short) board. Also check the edge connections on the PCB board, they will get burnt if the voltage slips. So after I got the Asteroid to power up, it sounded like it was playing blind. Well of course that means monitor problems. After making adjustments, I was pretty excited to see moving asteroids. But there’s a problem, See the image:
asteroids-5

There’s a bright DOT in the middle of the screen, DOTS in each asteroids and with retrace lines all over the place. The Problem was the Z AMP was out, then I did a full re-cap, replaced about a dozen small signal transistors in the def board and a little trace reworking. Hey after that, GOOD AS NEW!!!!

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2 thoughts on “DOT on my Asteroids

  1. I had the same issue. Recapped, replaced some transistors and it was still there. Turned out the wire for the Z amplifier in the 12 pin connector was pushed out and not making contact. Pushed it in and it works fine.

  2. I have an Asteroids game that has a very similar problem. I can tell it’s running because there is sound but on the video monitor all I see is a single dot. Does anyone know where I might find a schematic or can explain where the Z Amplifier is?

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