Author Topic: Tektronix 2456B after 10 mins - looses focus - (Read 1693 times)

jlp1167 · « **on:** March 16, 2016, 05:39:19 am »

The scope looses focus after running 10 mins. Anyone have this problem ?

tautech · « **Reply #1 on:** March 16, 2016, 05:46:35 am »

The scope looses focus after running 10 mins. Anyone have this problem ?

Welcome to the forum.

Can focus be recovered with adjustment?

From the Repair docs and links thread in the Repair board:
http://www.sphere.bc.ca/test/tek-parts/troubleshooting-scopes.pdf

amine · « **Reply #2 on:** March 16, 2016, 09:54:12 am »

Here is a link to the service manual http://www.atecorp.com/atecorp/media/pdfs/data-sheets/tektronix-2465b-2467b_manual.pdf

Page 79 describes the Focus Amplifier
Page 87 describes the Focus circuits

The Diagram on page 536 ( last page..) shows the Focus Amplifier circuitry..

Hope this will help you tracing the problem ..

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