Working on the Tek 2430 from yesterday. The fail I posted yesterday indicated a problem trying to verify the calibration of channel 1. I drilled down on the header fail and that's exactly what it was complaining about. After RTFM decided I might want to try a “Cold Start” first. It's a drastic measure that resets the DAC's and a bunch of other stuff and you risk losing cal data. Decided to go for broke anyway. But first I had to find and remove the jumper that allows you to perform that sequence. The manual offers no pictorial as to where it is and it took me over a half hour to find it.
See it? It's almost under the ribbon cable and that black block just below the “D”.
Once I removed the jumper was able to do a “Cold Start”. All kinds of relays clicking and clacking and almost a blank screen when done. Not good. Powered off and back up. Now taking a NVRAM checksum error. Oh boy. But not surprised because it basically did a wipe. RTFM stated several power cycles should clear it but the calibration constants might be corrupted. Did that several times and the checksum error cleared but now had a new fail.
Drilling down on this fail stated that the Channel 1 and 2 attenuators needed an external calibration.
Did the external cal. Was very simple. Apply .2VDC, then 2.0VDC, then 20.0VDC to both channels. Did that and it passed. But then the Trigger failed stated it needed an external cal. Both external trigger inputs required 0VDC, .5VDC, and 2.0VDC.
Done and holy shit. My stumbling and fumbling around fixed the damn thing. It's now working great. And waveform amplitude and frequency appear to be dead nuts. I will never be able to repeat that.