Re: Vanguard pink noise

There wasn't many, but all caps in the sounds circuits have been replace.
Tants, Electrolytics ceramics.

On Thu, Sep 23, 2010 at 2:56 PM, Rodger Boots <rlboots2@gmail.com> wrote:

> 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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> >>
>

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Received on Thu Sep 23 15:58:51 2010