So 5 years ago I took some hard earned money an plunked it down on a brand spanking new Tektronix MDO3014 scope plus the logic analyzer expansion. Great running scope, did everything I needed it to until this last week. Fast forward to current time, the scope would just keep resetting. Turn it on, it would run for a few minutes, then act like it got a power cycle. First things first, check prime power, yup that's good, stable and nothing else plugged it has issues. Next, I open the unit to check the 12V power supply, check, it's good (even monitored the output with another scope for glitches). I start checking other test points and find that during the reset the lower voltage outputs from the mezzanine board are also dropping out. It is unclear if that's normal during a power cycle, or possibly the cause. I investigate for hot components and can't find anything. There have been no error messages prior to a restart, just bam reset.
I contacted Tek tech support, they recommend upgrading the firmware (I was running 1.18 just fine) and sure enough during the firmware update, RESET! So now the scope has a discombobulated front panel microcontroller (read: buttons, knobs and lights don't work anymore).
Next step, request a service quote for getting it back up and running. Tektronix wants $2710 plus shipping to repair the scope. 5 years old, 1424 hours on it and it's essentially garbage.
![Angry >:(](https://www.eevblog.com/forum/Smileys/default/angry.gif)
Has anyone else had experience repairing the original problem of the random resets? Not really sure where to start looking yet. I think that the main acquisition board is ok, when it ran it had no problems getting a signal, and it was nice and clean. Nothing hot that I could tell. Any help out there?