Qbert Sound issue

Phetishboy

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I have installed a new cap in the power supply brick, new switching power supply and am running Mike Doyle's 7 in 1 multi kit. So why oh why do I have frozen sound on power up, regular sound on the 3rd power up (or so) then lose all sounds anywhere from 1-45 minutes later. A quick power down then up and the sound is back again. WHAT IS GOING ON? U-17 has been replaced on the soundboard and the sound chip on the CPU has been replaced. I have done every suggested mod known to man on this machine, and I still have sound issues. The switcher now supplys a much lower voltage for the sound amp and knocker, so I shouldn't be burning out components anymore. Is the lost sound a symptom of too little voltage?
 
wouldn't it be good to try it without the multi kit? that's the first thing i'd try - go back to basics...
 
I dont have any experience with the multi kit or arcadeshop switcher so I cant say if they are causing your issues or not. I can tell you that the LM379S should not be affected by the lower voltage. I can confirm the sound board runs just fine on around 16-30v. What are you getting on the 30v line? If I recall its a 24v switcher? I had actually done alot of testing with a very similar switcher on my qbert. I saw arcadeshop was working on this and was close to being finished with it so I scrapped that project. What im saying is I had no issues with the game running a switcher except the knocker which was very weak. I never confirmed if the problem was the lower voltage or the fact that my knocker had the wrong coil at the time.
 
I dont have any experience with the multi kit or arcadeshop switcher so I cant say if they are causing your issues or not. I can tell you that the LM379S should not be affected by the lower voltage. I can confirm the sound board runs just fine on around 16-30v. What are you getting on the 30v line? If I recall its a 24v switcher? I had actually done alot of testing with a very similar switcher on my qbert. I saw arcadeshop was working on this and was close to being finished with it so I scrapped that project. What im saying is I had no issues with the game running a switcher except the knocker which was very weak. I never confirmed if the problem was the lower voltage or the fact that my knocker had the wrong coil at the time.

I installed one of ArcadeShop's switchers in a Qbert recently and the lower voltage definitely made alot of the speech sound different along with the knocker being weaker. Previously the cab was running on it's original PS but the BR for the 11.5v to the CPU board died (and it had just been replaced a couple of weeks prior). Since the machine is running for 16 hours a day in a barcade, the switcher made sense since it generates alot less heat then the original PS.

Had to run the wire from the power brick that supplied 11.5v to the CPU board and connected that directly to the switcher.
 
Not sure if this will help, but I was recently having some sound issues on my Q*bert. All the sounds fired, but about half of them were the wrong sounds. I already have a switcher installed and I tried replacing one of the chips to no avail. After power cycling a lot, I noticed that sometimes the right sounds would play but then change to the wrong ones mid-game. I started jiggling connectors and when I got to the sound board edge connector, it became apparent that was the problem area. Fixed by reseating it.
 
i've got one of the arcadeshop.com switchers and an original power board, and i can switch them back and forth and have no difference on the sound or knocker.
 
Since the machine is running for 16 hours a day in a barcade, the switcher made sense since it generates alot less heat then the original PS.
So you've got this thing on location? I only ask because 16 hours is a would seem like a long time if it was in a home environment. I wouldn't mind having a chance to play a Q*Bert in the wild, but soon I hope to have mine up and running. :)
 
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