[Coco] cm-8

[Stan Blazejewski]

On Thu, 01 Apr 2004 10:19:15 -0800, you wrote:

>Hi,
>
>	My cm-8 is in intensive care. Something is wrong with the vertical
>sweep. It is way to tall and the
>linearity is off. And it is wrapping around on the bottom. I have the
>service manual. There are only two
>active elements in the vertical sweep circuit:
>
>	ix0065ce (ha11235)		sync processor for h & v, vert driver
>	ix0238ce (upc1378h)		vertical output
>
>Neither the vertical output nor the vertical driver output are correct
>on a scope (at least according to the
>little pictures in the service manual). The slope part of the vertical
>output has ringing (oscillation).
>Anybody have any idea which is fried and where I can find a replacement
>(an nte1550 may replace the ha11235 so
>that is probably not the one that is fried!)?
>
>	I have ordered a pair of the upc1378h things on ebay. Probably the
>other
>chip is fried.
>
>					kevin
>
>P.S.:	On a philosophical note, how does something break sitting in a
>box? I am almost certain this worked
>	when I boxed it up. I would have fixed it otherwise as I tend to be
>rather anal about such things?

Neither of those components would be faulty.  I would suspect any
electrolytic capacitors associated with those though (won't be more
that 3 or 4 caps), just replace them all & make sure the polarity is
correct!!.  I'll lay odds that will fix your problem.


--

Australia isn't "down under", it's "off to one side"!

stanblaz at netspace.net.au
www.stanblaz.customer.netspace.net.au
www.cobracat.com (home of the Australian Cobra Catamaran)