Re: Vanguard pink noise

Replace any small capacitors connected to the chip.

On Sep 23, 2010 2:53 PM, "Kevin Moore" <talon.k@gmail.com> wrote:
> 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)
>> www.flippers.com "Old pinballers never die, they just flip
>> out"
>>
>>
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Received on Thu Sep 23 15:56:29 2010