ADM 3a with no horizontal scan
cclist at sydex.com
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.
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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