Date: Tue, 4 Sep 2007 18:08:02 -0700
Reply-To: Jake de Villiers <crescentbeachguitar@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jake de Villiers <crescentbeachguitar@GMAIL.COM>
Subject: Re: It's time to hit that idle Stabilizer on the head!!!
In-Reply-To: <vanagon%2007090420234796@GERRY.VANAGON.COM>
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I can make a page for the pix on my Google Page if you want. Heck, you can
make your own.
I think Neil was offering to host Vanagon info too.
Yo, Neil, chime in here would you?
On 9/4/07, T.M. <tinkerman007@yahoo.com> wrote:
>
> Wow, I'm honored!
> While searching the list for BD438, I came across some very interesting
> posts by the two Jo(h)ns responding to this/my thread, and see that you
> and others have made great progress already. Your website (KENNEKE.COM) is
> awsome! Why didn't you hint you have such a nice website?...
> Looking at your ISCU page I see that our units are quite different (I have
> a 251 907 393C, while you have a 'B' model). My unit has two BD438
> transistors connected to each other, while yours has only one as far as I
> could see. Otherwise, the design looks quite similar with three LM2902 and
> one LM2903. You mentioned analog V->F converters, I said integrator
> circuits, basically they're the same thing, right?
>
> And I saw your posts planning to reverse engineer the ISCU...
> Well, I've done part of it by now, mostly the power supply circuits and
> the output driver, but it's not complete yet. And I see there's no point
> comparing voltages between two different designs (B & C).
>
> I think it would be best that we post our pictures (with annotations and
> test points marked) on the web somewhere, so people could add their
> measurements too. I don't think we even need to reverse engineer the thing
> completely - several crucial test points could provide most of the info we
> need.
>
> And now to your post -
>
> On Tue, 4 Sep 2007 15:58:38 -0700, jon <jon@KENNEKE.COM> wrote:
>
> >Very interesting. I've never seen an ISCU with any other failure than the
> >high current transistors. I have seen a rare case where the diode check
> >came out good...on a bad transistor.
>
> Yup, I was thinking of that possibility...I probably hurried a bit in
> soldering them back in because I didn't have a spare and hoped to find the
> problem elsewere, but no problem taking them out again with my superquick
> technique...
>
> >Also, with electronic items of that age, check out the electrolytic
> >capacitors (or, simply replace them all...sometimes that is just as
> easy).
>
> Not so easy with mine, because it was completely dipped in/covered with
> laquer before being put in it's box, to seal it against the elements.
> Heck, it's tough touching the PCB and getting a connection at all!...:-)
>
--
Jake
1984 Vanagon GL
1986 Westy Weekender "Dixie"
www.crescentbeachguitar.com
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