Battlezone sound problem....Only half the sounds present

learpilot2

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Battlezone sound problem....Only half the sounds present

I bought a battlezone, and it works great except for sound. It plays great, however, exactly half of the sounds are missing. The tank motor sounds good high and low, and the enemy and my tank fire sounds work. All the explosion sounds work.

The missing sounds are the alien sauser and alien guided missle sounds, the radar beep when a new tank appears, and the tune at the end if the game. The last 2 deep thumps of the tune work, but the begining of the tune is silent. When game is over, 10 seconds of silence (missing melody), then "boom, Boom". I saw the audio board has two TDA 2002 amps. I figured one must be bad. I replaced both, with no change. I ordered a bob roberts audio board rebuilt kit, and atari power supply kit, and rebuilt both the power supply, and audio board plus two new TDA 2002 amps. Still no change. Any suggestions? The sounds I have are coming through all 3 speakers, 2 overhead, and one lower left front. Thanks for the help. Also no Ram beeps during startup in test mode. All else checks ok on screen test display.
 
Sounds like a bad pokey, Radar blip, bump, saucer, Sacuer disentigrate, Missle Bonus, and 1812 all come directly from the pokey. Try reseating it first and see if that helps. I beleive the rest of the sounds are generated by using 4066 chips. Sounds like you have those. If you have another atari aux board you may try swapping the pokey location b/c2 on the aux.
 
I will try changing the pokey chip out. That must be it.

Had a question. The chip at the lowest position (b/c 2) says 8023e and c012294-03. Is that the pokey chip? I ordered a pokey, and it came printed with c012294b-01 and c03051 and AMI 8810MHO. Are these that same chips? Do I just swap them out? I assume the pokey chip is a sound ic and is interchangable with many games?

Thanks
 
You can also harvest a pokey from any old atari home computers (I beileve the 800's have them socketed) most others, like the 400, 7800, and ones inside certain 7800 cartridges are soldered in.
 
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