Traces drift on an used Tektronix 2430A

[auato]

Hi mates!

Look at this (the first 15 seconds of video = summary of all problems)

Why? Give me a hint where to start my troubleshooting. Power supplies seem to be in the ranges.


bye
auato

 

[betwixt]

As the amount of drift stays the same when the input attenuator is changed, it would point to a fault in the deflection stages. I've never seen one do that before though!

I would suggest the best place to seek help is the Yahoo Tek support group. It's a busy group and full of experts on 24xx series scopes, I'm sure someone there would tell you exactly where the fault lies.

Brian.

 

[Frank Hertel]

Auato---I had the same "Trace Drift" problem, but only on channel #2.

I wildly and quickly rotated the Vertical Position knob back and forth, making sure to engage the spring loaded detent on each CW and CCw rotation of the position knob.

I did this about 20 times and the Vertical position adjustment stabalized and started working again.

I just discovered this and can't be sure that it is a long term fix, but for now, mine is working again.

I assume(?) the spring loaded detent, on either side of the knob's free movement, enguages a "switch" that allows an internal ckt, to provide pulses for the "Vertical Position"/ data word, for that channel's "Vertical Position".

I suspect the switch had oxidized contacts from setting and not being used regularly?

I hope it works for you too.

Frank Hertel