HP-41C battery contacts



#5

Hi. I just got a HP-41C. I do not know if it works, and I do not want to buy N (E90) cells just to see if it works. I am planning to power it with some adaptor I will do, but I need to know if central battery contacts are connected to the internal circuits or just to each other.

Bye, Ricardo


#6

You can test with any good, clean 4.5 to 5.5 volt dc source. Power consumption is approximately 5 ma in the active state, it varies by model. The center two connections are only a jumper, there is no connection to the 41.


#7

Thank you, Randy

#8

Hi Ric,

It's just possibly worth your while to current limit the power supply to few hundred millamps or so to test your 41C.

If there is anything along the lines of a short in the interconnections that way you will save the internal power supply regulator.

Second hand machines sure do arrive with some strange faults...

DW


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