# Oscilloscope malfunction: Can someone help with a diagnosis?

This is the screen on my Tektronix 2465 oscilloscope when I power it up. It used to have the lines going all the way across and and when I would connect the probe to the stereo output (as a calibration test) I'd get a waveform.

But now there is no waveform at all, just faint vertical lines when I supply input to channel 1 using the probe. Has anyone else seen this problem before? If you have please tell me what causes it and how I might fix it!

• Can you post a picture of the knob settings? This makes me think off-hand of being in X-Y mode and that maybe curious hands tried out the knobs :) But I'm thinking in any case it will be helpful to someone more experienced with these scopes. Btw, you can post a picture directly in your question, which allows folks to see it without clicking through a link. – scanny Mar 24 '16 at 0:07
• yes, I've put my scope on that setting before, by accident, and it did that. – Tim Spriggs Mar 24 '16 at 0:34
• See BEAM FIND feature described on page 65 of service manual... These older analog Tek scopes had this feature where a momentary button press would shrink the horizontal and vertical drive (much like in your photo), so in case the horizontal or vertical offset were adjusted far off-screen it could be noticed and corrected. Maybe the beam finder switch is stuck? – MarkU Mar 24 '16 at 2:06
• MarkU, I'll give that a try and see if it helps things. – Mr X Mar 24 '16 at 5:32
• Tried that, it has no effect. – Mr X Mar 24 '16 at 15:52

• Thanks WhatRoughBeast! There is a company in Beaverton, OR that will repair it....for a price: $975 flat rate with possible and extra$400. I am feeling masochistic and it might be a great learning experience to repair it myself. I got the machine last year for \$300 so there's no way I'm gonna spend THAT much on repairs. – Mr X Mar 24 '16 at 5:29