[analogorgans] Re: SOS "Expression Pedal not working"
- From: "bh" <lexicon13@xxxxxxxxxxx>
- To: <analogorgans@xxxxxxxxxxxxx>
- Date: Mon, 07 May 2007 15:41:21 -0500
Hi Gerald,
Thanks for your quick reply. I followed your instructions
and removed the cardboard enclosure that surrounds the expression pedal
to get to the pot.
Illustrations of test connections made:
(Potentiometer)
/ | \
/ | \
white/brown solid solid
wire brown black
\ wire wire
\ / ^
\ or / |
\ / |
\ / |
[red test lead] [black test lead]
| /
| /
|______________/_____
OHMS meter
_____________________
I clipped the OHMS meter's Test-leads with the Black-test-lead on the
potentiometer's black terminal/wire and the Red-test-lead to solid brown
terminal/wire; I was able to observe a resistance variance reading on
the OHMS meter's scale when I operated the expressions pedal up and
down.
I then removed the OHMS meter's Red-test-lead and clipped it to the
White/Brown striped potentiometer's terminal/wire; with this connection
I was not able to observe any resistance variance reading on the OHMS
meter while operating the expressions up and down.
So then, it's safe to assume the potentiometer is shorted and I have to
replace it?
Barry
PS: I check the potentiometer for openings to spray it with the
electronic cleaner and there were none; it was hermetically sealed.
-----Original Message-----
From: analogorgans-bounce@xxxxxxxxxxxxx
[mailto:analogorgans-bounce@xxxxxxxxxxxxx] On Behalf Of GERALD PERRY
Sent: Monday, May 07, 2007 1:26 PM
To: analogorgans@xxxxxxxxxxxxx
Subject: [analogorgans] Re: SOS "Expression Pedal not working"
It sounds like the potentiometer is dirty or is shorted. Get a spray can
of electronic cleaner and spray the pot thru the openings. Work the
pedal back and forth several times. If you have an ohmmeter check to see
that the resistance varies when the pedal is moved. If there is no
change you need to replace it.
My experience is that after removing the back of the organ, you will
have to remove a cardboard enclosure that surrounds the expression pedal
in order to get to the pot.
Hope this helps.
bh <lexicon13@xxxxxxxxxxx> wrote:
Hello,
I have a Rodgers 750I organ and the entire organ is under one
expression pedal/volume control. While practicing a Toccata halfway
thru, the volume of the organ suddenly changed to full organ volume; ...
my feet were too busy pedaling away and weren't operating the expression
pedal at the time.
Where I live, Rodgers' techs are a few states away.
Nevertheless, I have some technical knowledge and I am hoping it a small
problem that can be remedied. If anyone can help with an answer to my
SOS, it would be greatly appreciated.
Barry
Email: lexicon13@xxxxxxxxxxx
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