On 1/01/09 2:15 AM, in article ,
"engineer" wrote:
"Mal Thomas" wrote in message
...
I have just become aware that one of the variable resistors (Mid Frequency
Attenuator) on the rear of one of my speakers is on the fritz.
Either the MF driver cuts out and/or the resistor, when turned, is noisy.
I
have managed to 'clean' the resistor somewhat by turning it back and forth
a
few times, but it is still a little noisy.
http://flickr.com/photos/22432327@N02/3136967471/ photo here.
Now I very little knowledge of the internals of a speaker so I would
appreciate some advice from someone who is more qualified than I am.
Looking at the panel in the photo, I would presume removing it would give
me
ready access to the resistor, but can I expect any sealant here or are the
screws the only thing holding it in ?
I know I can get replacements of these things from an electronics
components
shop, so any clue as to the type or rating would be appreciated.
Failing replacement, can I simply bypass it by removing it altogether?. I
usually run the MF one wide open, so I won't be too bothered if I lose the
control.
At the moment I have managed to find a spot where the driver is working,
but
I'd prefer to find a more permanent solution.
TIA
Cheers
Mal
Oz
G'day, Mal.
If you have even entry level competence with electrical stuff and a
soldering iron do not hestiate to go in, do the forensics and fix it (don't
bypass it, that would likely screw-up the speaker's sound balance.) The
potentiometer may well clean up with switch cleaner. If not a replacement
should be easy to find. Make sure that removed plates, etc, are well sealed
when you put it all back - not difficult to do: thin foam draft excluder
strip under them works well. Stick anything that need sticking with contact
adhesive. Ensure no dry joints.
Good luck!
Cheers,
Roger
Many thanks Roger. Yes I do have some soldering skills (a legacy from
building model railways for some years!).
I haven't open the cabinet yet, so can I expect to find the rating or 'part
#' of the potentiometer stamped on it somewhere ? Or is there some
'standard' type used for this purpose? (it is here that my experience and
knowledge fails me).
I'll try the switch cleaner route first though.
Regards
Mal
Oz