scopes [was: how to troubleshoot? ...]

[Happy Harry]

The XYZ unit sounds like a vectorscope. I'm not sure what the
professional use of these are, I think some kind of video
or communication use...

19" is HUGE for a scope.  Maybe its some kind of TV monitor or
test gear ???

Most scopes have the CRT shielded in a mu-metal can, and do
NOT have deflection coils (yoke) like a TV monitor. They use
electrostatic deflection. If you see a yoke like a TV... its not
a scope..

Working on scopes is semi-hazardous. There ARE high voltages involved
but they are similar to TVs in hazard.  A line isolation transformer
is a real good idea... and a schematic if you can get one. If you
are not sure where it is safe to put a probe ground clip... then stay
out for safety.

It is even possible to work on a bad channel of a scope using itself!
But I prefer a working scope to fix a non-working one.
Get the model numbers and inquire... maybe someone has the same or
similar and can hook you up with a schematic.

H^) harry


>From: Kasper Souren <kasper at industree.org>
>To: synth-diy at node12b53.a2000.nl
>Subject: Re: scopes [was: how to troubleshoot? ...]
>Date: Mon, 15 Jan 2001 16:52:14 +0100
>
>On Mon, Jan 15, 2001 at 06:10:53AM +0000, Scott Gravenhorst wrote:
> > I have to agree with Harry.  And after all, everything we do
> > has some cost of some sort.  In DIY electronics, it's some
> > cash spent for decent tools.  And as Harry points out, most of
> > them are one time costs.  At least things like oscopes last
> > a long time.
>
>Well, last a long time... I've found several scopes. One Philips (with
>two X inputs) sometimes doesn't give output. Another one (X/Y, 19"
>unit, quite big) never gives output, and one biggy (19", with weird
>inputs (X, Y, Z)) gives a very strange effect, it keeps in the middle
>with fluctuations in one direction (adaptable with knobs). Do you
>people have any clue of what could be wrong with these machines? And
>is it 'safe' to fix them when they're connected?
>
>greetz,
>Kasper

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