Electronics > Repair

[SOLVED] HP 34401a - Error 612, 613, 615, 617, 618, 619, 621

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Phiveaces:
Just wanted to say that thanks to Zucca, I now have a working 34401A :clap:

Mine only had errors 613, 615, 617, 619 and 621.

Setting the Ohms range to Ohms, and checking the output of U201 compared with its inputs showed  ~14V when it should have been closer to AGND.

Replaced with a new one from Digikey and now all tests passed!  :-DMM

Zucca:
That was my Xmas present to you! Enjoy!!!

chihaxinh:
I have same problem but replace U201 not help !  :(

Dr. Frank:

--- Quote from: chihaxinh on December 18, 2015, 08:00:11 am ---I have same problem but replace U201 not help !  :(

--- End quote ---

You mean, you have the same Error messages?

To change this OpAmp simply on this, was obviously the wrong action.

You also have to check the voltages in the Ohm circuitry, as zucca, Phiveaces, and me have done. This is urgently necessary to identify the really corrupt component.
A useful help is a diagram with the correct voltages vs. the erroneous ones, you have to measure on your own.

Please come back when you have made these measurements!

Frank

Zucca:

--- Quote from: Dr. Frank on December 18, 2015, 09:10:53 am ---Please come back when you have made these measurements!

--- End quote ---

+1

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