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| Tektronix 2235 AN/USM 488 - Diagnosis Help |
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| WhatsICC:
Hi All, I've picked up this military version of the 2235 for my first scope... :palm: It was $200, probably waaay overpriced but there's no real used market in my area, and a better price than the cheapest brand new rigol or siglent DSO. Plus im really only using it for audio at the moment I got it from an electronics surplus store not too far from me that had a bunch from a military base somewhere nearby. It seems to be in great condition, besides the horizontal knob having a bit of a crack and the radiation mesh on the outside having a slight tear in it... id say im a noob but that's an understatement. Forgive me if this post is frowned upon, I didn't find too many topics specifically on the 2235 or USM488 Everything seems to function as normal, both channels trigger in auto and norm. On the calibration point, it seems like it's hitting 500mv spot-on at .1v/div, the horizontal calibration seems a bit off but that's expected it doesn't look close to 1khz. However, there seems to be quite a lot of jitter in the traces, especially with the intensity turned up (this can be seen at 2:25 in my video.) When adjusting the vertical position the traces start to veer off "slightly" at the very top and bottom much worse at the bottom not as noticeable at the top. Could these be from the 2235 power supply issue I've read about? I'm also sure its got a few Rifas that need to go but it's working as of right now.. >:D Should I see if he'll swap it out for a different unit or is this one just a few tweaks away from glory days? I'd rather not, I'm not sure if this is the type of place that does returns at the least hopefully swap it out, he has 10... but if it is too far gone then it's worth a shot... I've included pictures and this is a quick 3 minute video: Any help would be great, besides the obvious return it for a DSO I feel like id learn much more from an analog. |
| TERRA Operative:
While not directly addressing the issue you have, I have a video on my youtube channel on upgrading a bunch of things in these scopes that might help out a bit, especially on the PSU side of things. https://youtu.be/lrXCVg6T-ek |
| WhatsICC:
I actually found your video on a previous thread and had it saved! I've begun watching it, I think I may just tear it down, swap the Rifas out and at the least all the PSU electrolytics. However, If anyone out there has some insight into my funny trace behavior that would be amazing. |
| Old Printer:
One of thew things I like about Tek scopes is the great service manuals they wrote. I have a 2225 and a 475 and the first thing I did was buy the manuals. Artek has high res scanned copies that are usually searchable and in pdf format. I just looked and both the operator and service manuals are available as a download for $7.00 total. You might find them free on the web but often the scans are poor, particularly the schematics. |
| WhatsICC:
Awesome!!! Very glad you mentioned that. I didnt know about Artek, I found some free manuals on the TekWiki but havent downloaded yet. If they look rough ill absolutely go the Artek way. Thank you very much:) |
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