Re: Vanguard pink noise

Well the MB3712 is the last amp in the circuit. I have isolated it, and the
noise is still present. Grounded the input to the amp, noise also still
present. that is why I thought it was the MB3712.

The only other thing I can think of is that there is noise coming off the
12v power. But my scope apparently isn't good enough to see it on the
output.

Kevin

On Thu, Sep 23, 2010 at 2:05 PM, John Robertson <pinball@telus.net> wrote:

> Kevin Moore wrote:
>
>> Hello all,
>> Working on a Vanguard, that has pink noise / static throughout the game
>> play. All sounds, and voice are present, just a constant background static
>> noise. At first I thought it was due to a bad MB3712 audio amp, but
>> replacing it did not help. I've re-capped the power supply, and no change.
>> So I'm wondering if anyone has experienced this problem on Centuri /
>> Vanguard before.
>> Thanks,
>> Kevin
>>
>> Try removing the volume control - if the noise leaves then something
> ahead of the volume control is the problem. Then use the schematic to
> isolate the various sound sources (lift resistors or capacitors that connect
> to the input side of the volume control) until you find the guilty party...
>
> John :-#)#
>
> --
> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
> (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
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> out"
>
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Received on Thu Sep 23 15:53:31 2010