Berzerk questions

don1400

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Hello,
I picked up a Berzerk just after the New Year and finally got it up and running and I have two issues that I could use some help with. First issue, The ZPU flashes 8 times but game beeps only 4 times, game plays fine. With only 4 beeps are there some other things going on with the game that are not apparent at the moment and will show up later? Second issue is with the voices, they are not all at the same volume. "intruder alert" is very loud compared to the others, one or two are almost a whisper is this normal or not? If not any ideas where I should start looking? Any help would be appreciated.
Thanks,
Rich H
 
Nope not normal, as compared with mine. There may be a problem with the attenuation circuit on the sound board. But then it could be an output problem coming from the voice board, going to the attenuation circuit.

There are a few caps on the sound board, you might start checking the ESR on those.
 
I disagree, the voices are definitely supposed to differ in volume. (Check out the schematics, there's a volume regulation circuit)
But the difference in volume should not be as much as you mention. This combining with your mention of some beeps missing while the flashes are there leads me to believe there could be a problem in your sound amplifier.
 
Both you and Talon were correct, turns out the sound board was causing the problems. I first cleaned the legs on the socketed chip and blew some contact cleaner in the socket, fired up the game and I got 8 beeps but volume on the voices didn't change any, so then I took a close look at the electrolytics and saw one had a nice bulge and another one looked suspicious. After replacing the two caps sound problem solved, all voices work properly, game now 100% working! Thanks for the help. Now when it warms up in the north here (June) cabinet gets stripped, fixed, primed, painted, stenciled and with the new control panel on order from Chris Moore it will look as good as new.
Rich H
 
Glad we could help. I had just got done fixing about 7 sound boards. The attenuation or (volume control circuit) uses those caps.

Not to mention all the interconnect problems, and dirty sockets :)

My funniest is when the game came up and it stated Chicken detected in Pocket.
 
Talon, reading your first reply a bit more thorough (I was in a hurry this morning) I think you meant the same as I probably did.
Anyway, good to know it's fixed. And go easy on the contact spray...

Would have loved to hear it say that !

I found some info from the MAME guys, and the vocabulary also has "HELP" in the ROMs, I wonder when it says that...Maybe when the slam-switch is activated ? I checked there is a connection for it but my Berzerk doesn't have a slam-switch on the coin door.
 
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