HP 35 - Working with AC Charger but not Battery Pack

[Michael Lopez]

Hi all,

Thanks very much for the useful information & suggestions.

As I previously indicated, I am new to the Classics range (had experience from HP41 series onwards) & wondered what that Brass clip on the HP35 was for. When I first saw it, I thought it might have been some kind of earth for the AC charger but it didn't mate with anything on the plug. However, I would never have guessed that it was like a mechanical "switch" to go from AC power to batteries :-( .

There was light corrosion on the pins & clip so I cleaned both in-situ but it still didn't work. Seems that the clip is quite loose & not exerting enough contact pressure against the pins. But the aluminium foil trick Mark suggested works fine. Just pushed some carefully folded aluminium kitchen foil between the clip & pins & all working now. So fortunately it didn't turn-out an internal corrosion problem (there is no evidence of leaks in the battery compartment either).

I presume the said clip isn't connected to anything internally? Am tempted to pull it off & then re-bend it so it isn't loose where it slips over the plastic ridge in the body.

For now though, very happy with my first Classics calculator.

Cheers,

Michael