Hi! thanks for passing by.
I have this Tektronix 2230 that has an incorrect sweep readout that shows 2s sec/div but only on a few of the sweep settings in B hor. Mode.
In A hor. mode it's just stuck, also to 2s.
Accordigly to the schematics the readout logic works by some comparators connected to a MUX.
I've checked the voltages (as stated by table 6-4) and found some incorect values that correspond to the settings with a non functioning readout, i'll post the schematics, some photo and the table i'm referring to.
Now the question is, how can i confirm that the comparators are fine?
I'm quite stuck...
Thanks for any help.
Federico
PS In table 6-4 the yellow highlited voltages are the ones that tested ok.
Schematics
https://www.tek.com/manual/2230-service-manual