[analogorgans] Re: SOS "Expression Pedal not working"
- From: Charles Strack <voceumana@xxxxxxxxx>
- To: analogorgans@xxxxxxxxxxxxx
- Date: Mon, 7 May 2007 17:19:16 -0700 (PDT)
Him Barry.
I don't have a part number cross reference, but will
look through my various manuals tonight & see if I can
identify the part number on one of the schematics.
By the way, if it is a No. 19 bulb, it's the same kind
they use on the music rack light. If it is a no. 19,
then it's probably got socket clips. The no. 19 is
globe shaped bulb with 2 pins coming out of the
bottom.
The 24CS is a cylinder shaped bulb, with wires
(somewhat fragile looking) coming out of its bottom.
It would be soldered into the board.
Charlie
--- bh <lexicon13@xxxxxxxxxxx> wrote:
> Hi Charles,
>
> Thanks for your reply. I went through my Rodgers
> Scarborough
> 750 manual and came upon schematic 1600A (OUTPUT
> PREAMP) and saw the
> following:
>
> ON EXP PEDAL
> -----------
> | +25 |
> | | |
> | | | (28) R5/1K LS
> | 500 |<---O----O----~~~-----O---- EXPRESSION
> | | | ] LAMP
> |_____=____| O---- 1460-026
> | AFFECTS
> | LDR'S
> 19,43,87,149
> =
>
>
> Yes, Charles, you are right on target. I looked at
> the OUTPUT PREAMP
> and found the (CdS Cells) under a black cover; there
> are four Cells
> which surrounds the lamp. So, I turned on the organ,
> turned on an 8'
> Flute stop, used a pencil to lock in one of the key
> signals on the GREAT
> organ and took a flash-light to the back of the
> organ and shined it on
> the CDS cells where the lamp is located and the
> organ volume went up and
> down as I shined the light on and off the lamp area.
> Wow, I would have
> never thought to have looked there. Let me know if
> the above specs
> relates to the correct lamp that I need and if you
> have any, please let
> me know.
>
> Barry
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