mar. 19 avril 2016

Tektronics 2445 scope PSU repair: part 3

After having mostly destroyed the PSU of my Tek 2445, I've decided to be a bit less foolhardy and I've subscribed to the yahoo Tek group. I discovered that such a failure has already been reported there, also after a full recap of the preregulator and regulator of ...

dim. 27 mars 2016

Tektronics 2445 scope PSU repair: part 2

After a quick repair of the PSU of my Tek 2445, I've started a more systematic replacement of the capacitors.

Tek2445 PSU Caps being replaced.

But I was also a bit worried because of a dirty noise coming from the preregulator area.

After having replaced most of the electrolytic capacitors, the dirty noise became ...

jeu. 10 mars 2016

Tektronics 2445 scope PSU repair: part 1

I've recently took my good old Tek 2445 scope from the cellar (along with my {tag}HP8904A signal generator), and it showed signs of tired PSU: unstable display, noise, then the typical noise of a capacitor failure.

Here is the beast:

My old Tektronics 2445 scope

And some pictures of its womb:

The main analog board. Top view of the scope.

The PSU ...