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Learned the hard way to simply replace every electrolytic cap, and then test EVERY semiconductor device in a power supply like this one. Choosing who to blame with voltage measurements can be iffy. A zener diode or transistor that flunks a test just gets changed.

This one does not have a trimpot for adjusting the output voltage. Those are always suspect when they get old. A drop of cleaner often smooths them out.

Testing every semiconductor device also serves to prevent fratricide. Changing just one failed part sounds reasonable, unless another failed part that you didn't replace overloads the new part and blows it out. Testing them all circumvents the risk of damaging a newly-installed component that way.

73

[QUOTE="nomadradio, post: 785354, member: 22"] Learned the hard way to simply replace every electrolytic cap, and then test EVERY semiconductor device in a power supply like this one. Choosing who to blame with voltage measurements can be iffy. A zener diode or transistor that flunks a test just gets changed. This one does not have a trimpot for adjusting the output voltage. Those are always suspect when they get old. A drop of cleaner often smooths them out. Testing every semiconductor device also serves to prevent fratricide. Changing just one failed part sounds reasonable, unless another failed part that you didn't replace overloads the new part and blows it out. Testing them all circumvents the risk of damaging a newly-installed component that way. 73 [/QUOTE]

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