Agilent 34401A Troubleshooting amp Repairing Multiple Errors

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=W22gWBYVMl8

I purchased this unit on Ebay knowing it was failing the self-test and had the following errors: 612, 613, 615, 617, 618, 619, and 621. A quick search on the internet led me to this ‪@EEVblog‬ forum thread: https://www.eevblog.com/forum/repair/... • After changing out some electrolytic capacitors I swapped out chip U201 - not an easy task without SMD tooling. I found this video from ‪@ToltecMerc‬ very helpful: • #2 Repair of Agilent 34401A Multimeter • The chip did the trick and the unit now passes all self-tests. • Timestamps: • 00:00 Introduction, self-test errors • 01:55 eevblog forum thread • 02:40 Schematic analysis • 04:00 Capacitor ESR results • 04:48 18V rails fix themselves • 05:30 Chip replacement strategy • 06:09 A new strategy • 09:07 Self-test passes, resistance checks, super stoked

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