Hi
I just got a used Tektronix TDS 540 o'scope. I was advised that
these had a huge problem with leaky caps. Before I had it, it was
explained to me that the panel lights lit up, but the screen didn't
show anything. In asking the owner of a repair shop what he'd
recommend I do when I got it, he said to make sure the memory protect
switch wasn't in the unprotect position.

So, today I got the scope. Sure enough, there were panel lights on
power-on, but no screen. I tried to find the switch through the holes
on the side of the case, but couldn't seem to get it. I opened the
case, found it, and flipped it. I then powered up the unit, thinking
I had put it in the "protect" mode. As it turns out, I didn't. It
had been in the protect mode when it arrived.

When I power it up now, the front panel lights come on and the fan
starts to whirl, but only for about half a second before they go dark
and the cycle repeats, click-click-click...

Stupidly, I also remember pushing a little tiny button mounted on
the top circuit card momentarily.

Any idea what happened? Did I erase some critical firmware that is
required to boot or something? I flipped the switch back, but it
wasn't any help.


Any recommendations?

Thanks

Josh
Seattle, WA