Pulled out my old Tek 2465 Scope and the horizontal sweep seems to have gone on vacation 🙂
Everything else seems to be working and I can get vertical deflection on the calibration point. Text, measurements and x/y mode work just fine. I've gone through the service manual and checked what I can (voltages are good, cleaned and re-seated the hybrids, etc), but since I don't have a second scope, there are several things I can check. It's from the 90's, so could be a capacitor issue, but visually, things look good. Any suggestions would be welcome
Everything else seems to be working and I can get vertical deflection on the calibration point. Text, measurements and x/y mode work just fine. I've gone through the service manual and checked what I can (voltages are good, cleaned and re-seated the hybrids, etc), but since I don't have a second scope, there are several things I can check. It's from the 90's, so could be a capacitor issue, but visually, things look good. Any suggestions would be welcome
The 2465 is a fantastic scope. It's definitely worth restoring. I'd start by checking the power supplies and make sure they're within spec (both DC and ripple voltage) but it sounds like you've done that already.
Does the text generator use the same time base as the rest of the scope?
Tom
Does the text generator use the same time base as the rest of the scope?
Tom
U800 is usual suspect for Horizontal Deviation issue.
There are much information on those scope and their common failure on this group : https://groups.io/g/TekScopes
rgds
There are much information on those scope and their common failure on this group : https://groups.io/g/TekScopes
rgds
Gee that sucks, I love my 2495A got it cheap too!!
Mine worked when I got it then 3 years later the OSD went wonky, calibration is slightly out as the traces do work properly, there is a issue with the trigger system and it shows, it tells me this when I power it up, all the screen character's are little stars, the voltage and sweep speed numbers show,other than that it works fine.
I watched many videos on replacing the cap's and things that go wrong, and I am quite capable of doing the job of refurbishing it myself..........
But, after watching those videos, And, reading a few pretty bad horror stories of DIYrepair on them (evidence of parts on "Ebay"), I chose at least for myself to send mine in to a Pro and have it done by someone whom has done a more than a few of them !!
It was a $15,000 scope when it was new it deserves to get another 45 years of use out of it.................
These were the Very Best of the Best, Best analog scopes ever made !!!
Cheers !!!
I Do hope that you do get yours running again as they are a Charm to work with, I am still tempted to go in there and poke around as I read of a few fixes for the OSD, but the trigger circuits!!?
The repair bill seems to be reasonable for these things and still obtainable as well, but it is still a good chunk of change nevertheless. :/
I am looking to find a 2465B 400mhs version as well some day that would set nice next to the Oscope's I have now. 🙂
Good Luck !! 🙂
jer 🙂
Mine worked when I got it then 3 years later the OSD went wonky, calibration is slightly out as the traces do work properly, there is a issue with the trigger system and it shows, it tells me this when I power it up, all the screen character's are little stars, the voltage and sweep speed numbers show,other than that it works fine.
I watched many videos on replacing the cap's and things that go wrong, and I am quite capable of doing the job of refurbishing it myself..........
But, after watching those videos, And, reading a few pretty bad horror stories of DIYrepair on them (evidence of parts on "Ebay"), I chose at least for myself to send mine in to a Pro and have it done by someone whom has done a more than a few of them !!
It was a $15,000 scope when it was new it deserves to get another 45 years of use out of it.................
These were the Very Best of the Best, Best analog scopes ever made !!!
Cheers !!!
I Do hope that you do get yours running again as they are a Charm to work with, I am still tempted to go in there and poke around as I read of a few fixes for the OSD, but the trigger circuits!!?
The repair bill seems to be reasonable for these things and still obtainable as well, but it is still a good chunk of change nevertheless. :/
I am looking to find a 2465B 400mhs version as well some day that would set nice next to the Oscope's I have now. 🙂
Good Luck !! 🙂
jer 🙂
Yeah. It's a nice scope. I have no plans to get rid of my 2465B. I re-capped the power supply as one of the voltages had too much ripple and the scope wouldn't pass calibration as result. I paid more for the caps than I paid for the scope. 🙂
Tom
Tom
I've been going through this page as well, U800 is a potential issue, but other aspects of the horizonal seem to work (such as XY mode). It's just the sweep that seems to be missing lol