Electronics > Repair
[SOLVED] HP 34401a - Error 612, 613, 615, 617, 618, 619, 621
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JohnAH:
That might be it. The 10V scale is slowly to rises to 9V. It really never gets there.
The 100V scale measures 10V.

Using Fluke Calibrator.
JohnAH:
Got it! C
Dr. Frank:
Got the fault?
JohnAH:
I don't know what is going on with my posts but a lot of them are getting truncated.

Yes found it. R105 had a cracked solder joint. It is passing everything now.

Thank you Dr Frank.
shaohu.tang:
In a few days I will also plan to repair a few of them, and then release them to ask everyone!
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