Archive of the former Yahoo!Groups mailing list: Rhodes Chroma Polaris

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Subject: RE: [chromapolaris] Re:No doubt..the most insane repair of all time...

From: "Paul D. DeRocco" <pderocco@...>
Date: 2007-02-10

> From: Robert Weigel
>
> Thanks..yeah...I know buttons fail :-). But...I'm talking
> about ALL of them. Literally..every one has failed within a
> matter of hours after working great ...completely great...for
> 20 years! hehe. Yeah I know other people have a button or
> two fail here and there.
> <snip>
> Yet..what am I to think? ALl of the ribbons look perfect. Like I
> say..continuity all the way down to the flat on every line! I
> seriously..believe this thing should be in a 'freak occurance
> museum' someplace. hehe. I mean just the membrane panel.
> Give me another one and I'll take the chroma polaris for my
> contribution :-)
>
> But I'd say much more likely..somehow there is a weak point
> under the panel somewhere and all the data lines severed
> somehow. Even though I..never pulled or anything on anything
> that should have done that..ahem..

Do you have a scope? This should be pretty easy to diagnose with one.
However, the SWSTB lines are open-collector, so it's helpful to touch them
with a resistor to +5V just to make sure the driver is working correctly.

--

Ciao, Paul D. DeRocco
Paul mailto:pderocco@...