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On Tue, Sep 18, 2012 at 1:30 PM, Michael Hawkins <korgpolyex800@...> wrote:You should be AOK in the group. You are not in any naughty bin. At least, not as far as I can tell.
Mike
From: Tavish McDonald <tavishmcronald@...>
To: korgpolyex@yahoogroups.com
Sent: Tuesday, September 18, 2012 3:38 PM
Subject: Re: [korgpolyex] Re: Just made a trade for a broken poly 800! Problems at first glance!
Good guess, from what I can tell it turns out they did do exactly that. I turned the board over and found a some wires connecting the jack to where the battery current goes in. Also two capacitors going across the output/headphone jacks, maybe if I cut these the headphone jack will work again. I would post pictures of what I found but I'm having trouble getting into the members only area now?On Tue, Sep 18, 2012 at 10:14 AM, bimmerfan222 <bperkins211@...> wrote:
Hard to tell from the pics, but I wonder if the prev. owner/butcher managed to somehow re-route the external power connection direct to the battery terminals and that's why it powers up when you plug a wallwart into the 9v DC input jack.
I think the LED they put in it was perhaps either an activity indicator or they simply didnt have a standard diode to put in.. so they used a LED instead (not a good idea since it gobbles up current).
Since it does power up and you have LED display activity, it sure sounds like it's not dead yet and perhaps recoverable.. just going to take time/patience to go thru it and restore it to OEM specs.
-Blaine
--- In korgpolyex@yahoogroups.com, Tavish McDonald <tavishmcronald@...> wrote:
>
> Yeah this thing is definitely going to need some work, I thought getting it
> cleaned up would be a good place to start while I find parts. I have
> powered it on with an adapter without Q1 somehow, I wonder if the
> nonfunctional headphone jack has anything to do with this transistor. I
> have the service manual.
>
> Yes the compartment shows signs of battery leakage.
>
> http://www.sdelectronic.rs/php/elm.php?prm=TR2SB
> based on this it looks like TR2SB764 is 60v 1a 10w. Is that what I need to
> know to find a replacement or is there more to it than that? Obviously I
> don't know much about electronics/transistors.
>
>