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HP 3455A repair and capacitor question.

 

I have a 3455A that I have been using, and recently it stopped working and throwing the Cal Constant #12. After finding my 30 Volt test point low and TP 14 low, I found capacitor C57 bad with my Peak ESR meter. After replacing this capacitor, everything went back to normal when the Test button is pushed, and my voltages came back up fine.
My question is, when I bought the correct dimension capacitor on DigiKey, they were all listed as "audio" capacitors and not "general" service. Its a Nichicon UKZ1H221MHM capacitor. Is it OK to leave in or should it have a general service capacitor.
Thanks, Rob?
Bob Albert
 

I doubt that it will make a significant difference.? Having said that, I wish it were that easy to fix my 3455A.? It worked well until one day it stopped.? Please guide me toward a solution.

Thanks, Bob

On Saturday, August 22, 2020, 11:56:56 AM PDT, Rob Naulty <rdnault851@...> wrote:


I have a 3455A that I have been using, and recently it stopped working and throwing the Cal Constant #12. After finding my 30 Volt test point low and TP 14 low, I found capacitor C57 bad with my Peak ESR meter. After replacing this capacitor, everything went back to normal when the Test button is pushed, and my voltages came back up fine.
My question is, when I bought the correct dimension capacitor on DigiKey, they were all listed as "audio" capacitors and not "general" service. Its a Nichicon UKZ1H221MHM capacitor. Is it OK to leave in or should it have a general service capacitor.
Thanks, Rob?
 

I started with the test points for voltage. Also the 10 volt reference was low at 9.2 and -9.1 volts. They also came back to 10.0 and -10.0. The Peak ESR meter really came thru. Also about a week ago, Hakko had 20% off, so I bought a FR-301 desoldering tool. Pulling out the capacitor brought a smile to my face.
Its a 50V 220uf capacitor with 7.5 mm spacing. I at least kept the correct size and voltage and capacitance. I didn't know if any one else would have upped the voltage or capacitance to put a general service capacitor in.?
Thanks, Rob

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