Electronics > Repair

tektronix TDS500 TDS700 power supply models PSU repair

<< < (4/6) > >>

TERRA Operative:
Nice!

Let us know how your testing goes! :)

Tantratron:
This morning I've connected the PSU tester into the old style PSU which has been failed for mor ethan 3 years and just sitting here. This time, no LED lights up where from what I see or hear, there is some kind of oscillation or attempt to run the standby.

As for the four RIFA capacitors, what new part number do you purchases to be equivalent ?

When the PSU tester does not show any LED to be ON, what other means could I use to investigate the power on failure through the PSU tester ?

TERRA Operative:
For replacing the Rifa capacitors, I used part number R413F11000000K but any similar equivalent would be fine.

As for troubleshooting, check the parts I pointed out in the image I posted above. If there is no standby voltage, then that part of the circuit is probably bad.

PwrElectronics:
I hadn't read this thread when it was originally posted.

Don't have any advice on repair of these but....

I was a product and test engineer at Zytec from 1994-1996 and worked in the factory in the small town of Redwood Falls, Minnesota where these were made.  I remember seeing them in an adjacent production line area to the one I was assigned to.

Zytec was a spinoff of Control Data (mainframe computers) power supply division in the 1980s when Control Data was closing down.

Zytec merged with some other company whose name escapes me around '97 or '98 and the joint company was called Artesyn.  This lasted a few years until bought by Emerson and it was known as Emerson Power Systems or Emerson Network Power.  A few years back, the name returned to Artesyn Embedded Power.  Now, its been bought by Advanced Energy in 2019.

The Redwood Falls factory was closed/sold around 2000 or 2001 and production was moved out of the USA.

DavidAlfa:
Just repaired the PSU from a TDS 520D, found no schematics, it was blowing the breaker.
The PFC circuit has two small bjts driving the big fets, the 2n4401 was shorted so it was setting the fet permanently on.
Replaced with a MPS2222A, it's back to live, 420V generated in the beefy cap.
It's had been touched before (Failure sticker from 2017), the IRF450 fets looked new.
Though the guy gave up and put a sticker "Short in transformer" ::).

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod