Chris -
I have a spreadsheet with parts for refreshing the 2465a LVPS along with Mouser part numbers. This has worked well for my scope. After reading the Condoraudio piece and looking at this list you can decide what you want to do. You can grab the spreadsheet 2465LVPS_ReCap.xls from
or I can email it directly to you if you can get your email address to me.
Chip
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--- In TekScopes@..., "Chris" wrote:
Hello all,
I'll try and keep this short. When it comes to electronics I'm somewhat a newb, but not entirely. I've always been interested in it, and I've recently purchased a scope - the tek 2465 300Mhz unit. Spent some time getting familiar with it, playing around in XY mode, and then used it for some diagnostics with some inductive sensors I was having an issue with. Just when I was getting ready to pack it up from verifying the sensors the scope went a bit goofy. The display at the bottom appeared to be "compressed" to a a central blur (I could change it's intensity with the readout intensity) and my traces were a short line near the center of the screen. I powered the scope off, waited a few seconds and then powered it back on, and it now powers on, lights up all the LED's, and I get a super bright --- display at the center of the screen (unaffected by intensity adjustments etc).
So, as typical I pulled the cover and did an initial once-over. I found that on the main power supply board by the mains that 2 of the capacitors look rough (one with the outer shell opened up). If you reference this pdf regarding a 2465B, the 2nd image of the A2 PCB has the very capacitors circles in red. The lower most one in the image is the one that looks like it may have blown. I haven't pulled the board out of the scope to get a better view of it yet. The rest of the capacitors on the board are the green and brown mix as the image in the PDF shows, which leads me to believe they're still the original capacitors in the unit.
Now in researching and reading about these scopes before I purchased one, I had read that the capacitors were a common issue in them. I have no worries about un-soldering components and soldering new ones in as I've done it numerous times to revive other old equipment. (And I've read about the need to cool these scopes with a fan if you operate them with the cover off)
So sorry to drag this out, so I'll try to make this quick. For those in the know about these scopes, is there a listing/BOM for what capacitors should be purchased and replaced?
Does the 2465B use the same values/locations on their boards that I can just follow the PDF I linked?
Does my issue sound like something that the capacitors could be causing? Or is it likely more involved?
I'd be happy to provide images or video as requested if it will help.
A huge thank you for taking the time to read and/or respond!
Chris
