Re: 2247A PSU Burn Mark near R2254/2255/2272/2273 and how to fix based on service manual


 

Ha! So there was a change notice from Tektronix addressing this exact
issue.

In the original design they must have figured that two 200 milliwatt
resistors in series for 400 milliwatts would be enough (and using
multiple parts is a fine way to distribute the heat load over a wider
area) but ultimately it was not and they changed it to one 1 watt
resistor.

On Mon, 14 Mar 2016 12:50:20 +0000 (UTC), you wrote:

Just in case members encounter this same issue.
Sample picture and fixes can be found in
https://groups.yahoo.com/neo/groups/TekScopes/files/2247A-PSU-BurnMark-Near-A18R2254%20/

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