Fixing a Tektronix 2246


Hi all! New to groups, so bear with me if I’ve messed up something.

I have a Tektronix 2246 with some very strange symptoms, it’d be great if I
could have some help diagnosing it. Basically, all I have is a flat trace,
no response from signals and no text on the top or bottom to indicate
voltage. That is, unless, I press the menu keys that pop up the previous
measurements, voltmeter, etc. if I press those, the display works.

So far, I’ve:
-checked the voltage rails, all spot on
-looked around for faulty components
-replaced a leaking capacitor on the psu, even though the voltage was fine
-tried every combination of the front panel buttons/knobs

How would I go about finding the issue? Any help would be appreciated.


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