HP82002A replacement capacitor

[teenix]

(05-25-2020 07:39 AM)BusyCalc Wrote:  Hello,

how can you measure or "feel" that a charger is not working properly and it needs a capacitor replacement?

I own a charger from a HP-80 1603S and I charge a battery back once every 2 months approx. The battery gets full and I don't think the charger gets too warm, but I'd like to know how to be sure and avoid accidents with it.

Thanks.

Kins regards,

Oscar

Hi Oscar,

It is hard to say just by the "feel".

Generally a problem will show up as battery damage due to overcharging, or batteries that appear to run down earlier than normal, indicating faulty batteries and/or a faulty charger.

I think you can only test the charger with some electronic test gear like meters, oscilloscopes and component testers.

The calculator charge plug and socket may be worn as could be the mains plug and wiring. The electrolytic filter capacitor is not rated for 40+ years of use, so it would be my first choice in new components. Then I'd have a good look at the circuit board condition followed by semiconductor, resistor, transformer checks.

cheers

Tony