Hi, Michael:
The aluminum chassis in Tek scopes has been Alodized or Anodized (I
can't remember which process is used). This process cleans the surface
and hardens it. I'm no chemist, but I think part of that process uses
potash. If you use potash to clean it I think your chassis surface will
be changed (will not look good).
Any chem heads correct me please.
Bill Roberts
michael.petereit@... wrote:
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Dave,
I fond that thread but it didn't gave that conclusion.
I used alcohol for slight mud, this scope was placed in a dirty an humid cellar for years without it's coverage.
The aluminium is best cleaned by caustic potash but it will eat up tin too.
Thus I tried with a industrial cleaner which worked pretty good. In the area of the high voltage transformator I didn't used anything else than alcohol. I was afraid of getting shorts by using chemical stuff.
I try to build up ths voltage divider to measure the high voltage.
BR,
Michael
-------- Original-Nachricht --------
Datum: Sun, 04 Feb 2007 14:27:26 -0600
Von: Artek Media <manuals@...>
An: Michael Petereit <michael.petereit@...>, TekScopes@...
CC:
Betreff: Re: [Tekscopes] old fashioned 535 - first start after 35 years
Michael
For starters , do a search in the Tekscopes archives for a a long
email thread on washing and baking old scopes to get the grime out .
It may be as far back as two years ago but there was a lot of discussion.
Next I would carefully remove and mark the locations of all the
tubes, find a friend with a tube tester and test all the tubes ...
Once you have a clean dry scope and a good set of tubes time to start
tracing the circuits for bad electrolytic.. Many will suggest that
you just replace them all :-)
Does the filament on the CRT glow ? If that is dead ...you may be out
of business till you find a doaner scope
Good luck and HAVE FUN
Dave
At 02:02 PM 2/4/2007, Michael Petereit wrote:
Hi,
now I finished the repair of this pretty old scope. I switched on and
was afraid of getting "flames" out of it.
This didn't happen but even after 10 minutes running no beam appeared on
the tube.
Since the servicemanual describe resistors and capacitors with it's
number within the system the reality looks different.
I cannot measure neither 9kv voltage nor I can find the correct part
cause the scope is pretty dirty inside.
Any hints where to look first ?
Thanks,
Michael
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