[analogorgans] Re: Rodgers 220-II air sound
- From: matt@xxxxxxxxxx
- To: analogorgans@xxxxxxxxxxxxx
- Date: Mon, 31 Dec 2007 17:03:11 -0600 (CST)
No offense taken; it's a fair question. But yes, I did know about the
switch. I can't hear any difference between when the switch is on or off.
I've tried turning the pots on the board to either extreme, and I've
listened to a variety of stops and keys as well.
I should mention that the air sound switch had been wired to the emitter
of Q285 (instead of the base, as shown in the schematic). I moved the
wire, and I don't see any obvious damage (like burned or shorted
components) on the board. I'm loath to start pulling and testing
components without a better idea of how the circuit works.
Matt
> Hi Matt,
>
> Don't mean to insult you in any way, but you do know about the switch
> under
> the key desk to turn it off and on(?).
>
> Assuming the switch IS ON, can you adjust the pots on the outermost rack
> and
> hear any difference?
>
> Best regards,
> Jerry Akers
>
> -----Original Message-----
> From: analogorgans-bounce@xxxxxxxxxxxxx
> [mailto:analogorgans-bounce@xxxxxxxxxxxxx] On Behalf Of matt@xxxxxxxxxx
> Sent: Sunday, December 30, 2007 10:09 PM
> To: analogorgans@xxxxxxxxxxxxx
> Subject: [analogorgans] Rodgers 220-II air sound
>
> Hi all,
> I recently acquired a Rodgers Cambridge 220-II organ in mostly-working
> condition. I'm working on fixing the non-working parts and the air sound
> has me flummoxed. I can't hear any difference between when the air sound
> is on and off. (I assume that means it isn't working -- this effect isn't
> so subtle that it's completely inaudible, is it?) Working from the
> schematics in the technical manual, all of the inputs to the board look
> good and none of its components are obviously bad. Anyone have any
> suggestions? Can I even troubleshoot this without a scope?
>
> Thanks,
> Matt Roesle
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