marantz pm-44se volume/balance, strange problem/noises.

Archived from groups: rec.audio.tech (More info?)

Sounds as if cleaning the controls would probably fix it.

Here's some advice from an old post, possibly a bit more than you need:

One uses a cleaner / lubricant designed for the purpose, such as Caig
De-Oxit, usually in a small aerosol can with a plastic extender tube. With
the valve on the can set to LOW, one sprays a bit of cleaner into the
control, aimed at the carbon element, if it's a potentiometer, or at the
moving and stationary contacts, if it's a switch. Work the control back and
forth numerous times. Usually we repeat the process.

There's other fine points - such as blowing out the dust etc first, and
packing tissue around the control to catch runoff and prevent a mess. Often
it's necessary to hold the unit at some impossible angle so gravity can help
get the cleaner where it needs to be.
I will often blow out the controls again with a compressor and repeat the
treatment, it's my belief that by so doing I blow out some of the debris
loosened by the cleaning process.


Mark Z.

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"Andy wilson" <ajw@bushinternet.com> wrote in message
news:408fafce.0404110238.7bda5330@posting.google.com...
> Amplifier produces a "crackling" noise through speakers when volume or
> l/r balance is adjusted, then settles back to normal sound/function
> when adjustment is made and the controls are left alone. It does it at
> all volumes and strangely how bad the crackling noise is, depends on
> how "heavy" you grab/touch the volume knob?? (perhaps pure coincidence
> but i thought i'd mention it).
> Does anyone know if this is a serious problem or one which can be
> fixed without much hassle/expense, or should i get rid and replace.
> (its only started in the last week or so.)

Archived from groups: rec.audio.tech (More info?)

Fine, but how does one vacuum inside of a switch?

mz

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"unitron" <unitron@coastalnet.com> wrote in message
news:ae27d822.0404121850.57c7ba35@posting.google.com...
> "Mark D. Zacharias" <mzacharias@yis.us> wrote in message
news:<c5bahb$2qqehg$1@ID-180484.news.uni-berlin.de>...
> > Sounds as if cleaning the controls would probably fix it.
> >
> > Here's some advice from an old post, possibly a bit more than you need:
> >
> > One uses a cleaner / lubricant designed for the purpose, such as Caig
> > De-Oxit, usually in a small aerosol can with a plastic extender tube.
With
> > the valve on the can set to LOW, one sprays a bit of cleaner into the
> > control, aimed at the carbon element, if it's a potentiometer, or at the
> > moving and stationary contacts, if it's a switch. Work the control back
and
> > forth numerous times. Usually we repeat the process.
> >
> > There's other fine points - such as blowing out the dust etc first, and
> > packing tissue around the control to catch runoff and prevent a mess.
Often
> > it's necessary to hold the unit at some impossible angle so gravity can
help
> > get the cleaner where it needs to be.
> > I will often blow out the controls again with a compressor and repeat
the
> > treatment, it's my belief that by so doing I blow out some of the debris
> > loosened by the cleaning process.
> >
> >
> > Mark Z.
> ---snip---
>
> Don't blow, vacuum. You want to remove unwanted stuff, not permanently
embed it.