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Tektronix 2465B repair advice

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siggi:
Your display problem is most likely due to problems on the A5 board. The 2465X scopes are all drive-by-wire, and the versions that have SMD capacitors on the A5 board are infamous for the caps leaking, which wipes out the reference for the DAC. This in turn takes out the intensity controls and creates a whole host of other problems.

Read through the thread as suggested here, and you'll find plenty of A5 trouble.

--- Quote from: med6753 on May 28, 2021, 05:14:19 pm ---Set aside a few hours and read through this thread.......

https://www.eevblog.com/forum/testgear/tektronix-2465b-oscilloscope-teardown/

--- End quote ---

Mark Krass:
Hello 705jas,

Did you manage to nail down this problem after all? It looks like I've got the same issue.


--- Quote from: 705jas on May 28, 2021, 06:25:54 am ---HI All

Just picked up a 2465B and it powers up and seems to do what it should eg. Auto works on a signal, all 4 channels are there and measuring works etc but the main issue I have is the strange screen display (see video( https://youtu.be/SbDoiq8P4Bs ) and pics).  All voltages have tested ok.  Initially, I had no display but a slight tweak of the Grid Bias and the display was there.  Still has all original caps etc.  Should I recap it as a matter of course and then start the troubleshooting again?  Suggestions on where to get a cap "kit" from?  Sorry for the newbie questions but just starting my journey with this beautiful old scope.  I would love to get it fully working.  Any advice appreciated.

cheers....705JAS

--- End quote ---

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