Re: Vanguard pink noise

I hate shotgunning, but if the caps have been replaced it's time to go after
the resistors.

On Sep 23, 2010 2:59 PM, "Kevin Moore" <talon.k@gmail.com> wrote:
> 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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>> >> chris@westnet.com
>> >>
>>

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Received on Thu Sep 23 16:02:11 2010