Electronics > Repair
tektronix TDS500 TDS700 power supply models PSU repair
Tantratron:
Thanks @inlinebeginner for clarifying the C17 topic where as a reference, my very first post shows pictures of old and new PSU
https://www.eevblog.com/forum/repair/tektronix-tds500-tds700-power-supply-models-psu-repair/msg5160828/#msg5160828
Yes clearly the standby circuit seems really different, same for the PFC-boost converter section when dealing with new design. As you know, there are no schematics for TDSxxxC/D but the low volatge DC output parts seem similar. The differences are really the standby section and the PFC-boost section plus I find new design easier to access the mosfet, the screws...
TerrySt:
Terra,
Thanks for the heads up on the capacitors in the old power supply that need changed. I have my old 524A opened up to work on the CRT power supply, so I'm going to change the parts you suggest (C17 and the 4 RIFA caps).
I noticed that in the picture you posted of the old supply with the suspect parts circled, that you circled C16 instead of C17. C17 is the cap right next to the one you circled. At least that's how it looks on my supply, which matches your picture. Unfortunately I don't have a parts diagram for that model of supply to be sure, but the part next to the one you circled is 47uF at 80V.
Terry
TERRA Operative:
Ah, I may have made a mistake. I'll correct the image and reupload it tonight.
TERRA Operative:
Corrected image is now uploaded.
Tantratron:
Hello Terra, it took a while to import from eBay-USA to France but finally got your amazing TDSxxx tester.
Attached pictures showing its use on a valid PSU (new style) then later, I'll try to use it on my two old style PSU, one being broken.
I understand your recommendation to replace some RIFA caps first to not aggravate these two PSU.
Respect for your work, Albert
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