My 54825A had a power-up problem: if you unplugged the AC cord for a few hours, pressing the front-panel button wouldn't power on the scope. But if you plugged in the AC for about 5 minutes, it would work fine again.
That sounds like an easy thing to fix, but the whole power-on architecture was a baffling Rube Goldberg device from the button on a small support PCB to the front panel PCB to the PC plug-in card to the power supply. I've never seen anything like it.
I disclosed the flaw to the buyer (the price was very low) and he was excited to have something to work on. :-)
That sounds like an easy thing to fix, but the whole power-on architecture was a baffling Rube Goldberg device from the button on a small support PCB to the front panel PCB to the PC plug-in card to the power supply. I've never seen anything like it.
I disclosed the flaw to the buyer (the price was very low) and he was excited to have something to work on. :-)