Electronics > Repair
HP 34401A Error 606 on Self Test (Solved?)
Kleinstein:
A cracked / cold solder joint is a real possibilty. To get a higher voltage for the 5VB the suspect points would be around U401, especially the feedback path and decoupling capacitors (could make U401 oscillate).
I doubt tha a low mains voltage would cause such an issue. The HP meters are usually made to work also with a rather low voltage. The symptoms from a low mains would be more additional noise from ripple coming through the regulator.
gamerpaddy:
same problem here
i had 3 units with error 606. after replacing the big electrolytics it went away and self test passed.
error 606 also showed in the diode Vf test mode as the voltage reading was very unstable and every reading was off by more than 10..15%
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