Re: Help with Tektronixs 492 S.A. PSU fault.
I had a similar type of fault on my Tek 466 storage scope. The supply rail was down to 4.7v approx and that was the clue.
I found a huge current drain and the fault was a short cct 2.2uF capacitor fed from a 4.7v zener which was supposed to feed 10v or so to the trigger pots. Believe it or not this little 400mW zener was taking all that current and didn't blow. The capacitor in question was a small yellow type about the size of the zener. Just follow the track around looking for a short to deck.
73 Geoff. G4XMJ
On 15/01/2021 18:55, Nick Gregory G0HIK via groups.io wrote:
I came to switching on one time and it light up, but nothing on the display.