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Subject: where to find parts to replace Q1 and Q18? bringing dead polys back to life!

From: Marcus Wilson <JB@...>
Date: 2007-11-10

Q1 and Q3 can be replaced by:
BD140

http://www.dse.com.au/cgi-bin/dse.storefront/4735dc390a33bb062740c0a87f9c06b4/Product/View/Z1444
.85c ea

Q18 can be replaced by:
BD139

http://www.dse.com.au/cgi-bin/dse.storefront/4735dc390a33bb062740c0a87f9c06b4/Product/View/Z1443
.85c ea

just be sure to ensure they are in the right way around!

I have had 3 polys with no powerup, and dirty looking transistors.

By replacing these 3 transistors I have been able to resurrect 3 polys so far!

this secret is now out, and good luck to all who wish to try to repair a dead poly using this replacement method.

Once these are replaced you should be able to see 11 P on the display of the poly, and re-load your patches.

Best Regards,

Marcus Wilson



On 10/11/2007, at 10:35 PM, korgpolyex800 wrote:

Jon,

I did a google search on "NTE185 replacement" and "NTE254 replacement"
and got plenty of hits where you can get those transistors.

Let us know how you progress.

Mike.

--- In korgpolyex@yahoogroups.com, "Jon" <shonokij@...> wrote:
>
> Hi!
>
> New to the group and proud owner of a broken Poly 800 MKII!
>
> The guy who owned it before me tried to restore it, with poor
results (I think his plan was to
> cover it with solder and pray it works afterwards.. it didn't!).
>
> I've cleaned his mess up. But I'm missing Q1 and Q18 looks kinda abused.
>
> Since Q1 - B744 is no longer in production. It's replaced by NTE185
- hard to get for me and
> expensive. And it's the same with Q18 - B794 replaced by NTE254.
>
> So I was wondering if you guys have any suggestions for other parts
i could exchange Q18
> and Q1 with?
>
> Thanks!
>
> //Jon
>