ADM 3a with no horizontal scan

Chuck Guzis cclist at
Sat Apr 9 16:51:15 CDT 2016

On 04/09/2016 01:21 PM, Seth Morabito wrote:

> I'm fairly surprised that the 7805 regulators died, and that they 
> present this symptom (no horizontal scan) upon their death. I'm sure 
> there are other marginal components that will need to be replaced,
> so the restoration is not yet complete until I'm confident I'm not 
> stressing the new 7805s too much.

Good job!

You might check to see how much current and the input voltage of the
7805 is being fed.  Too high a current or input voltage can cause the
regulator to run hot.  There are some remedies for that, such as
replacing the regulator with a "simple switcher" type regulator module.


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