Re: 2465 help to fix
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I can attest to the need for a bench fan when running this scope without a case. I use a small clip on fan that can be pointed directly at the instrument.
My first thought for this problem was tht one of the Horiz leads was loose from the scope. They are accessible from the bottom when the case is removed. But then I saw the trace can be moved to the left side of the screen. This seems to say the horiz is working.
I still lean to the idea that something is bleeding the power when knobs are turned but I cant think how since it didn't show when the OP measured voltages as he turned pots.
Im stumped. Not quitting, just stumped.
From: Don Black
Sent: Sunday, January 12, 2014 2:36 AM
Subject: Re: [TekScopes] Re: 2465 help to fix
Have you tried tapping the instrument (gently) to see if it's sensitive to vibration. I think it would have to be very touchy to get these results from the mere vibration of turning a knob but it just seems so general that it's possible. While it could be the CRT it doesn't look like it to me so don't slash your wrists just yet. I've never worked on one of these but is it possible to measure the deflection voltage going to the tube. You should be able to see it jumping all over the place in sympathy with the trace movement.
At least you've won weird fault of the month award.
PS can someone advise if this model overheats if operated with the covers off and needs a desk fan blowing into it while working on it?
On 12-Jan-14 6:47 PM, machine guy wrote: