|HP 35 charger/case questions|
Message #1 Posted by Adam Vaughn on 2 June 2011, 11:15 p.m.
Hello, everyone! I recently became the proud owner of a Hewlett Packard 35 calculator (version 3). It came with several original accessories, including the hard plastic case, the leather soft case, a restuffed 82001A battery pack, and the manual. However, the power supply included with it was decidedly non-original: basically a 9V 200mA DC wall-wart connected to the charging pins of the original connector! For the hell of it, I measured the voltage at these pins without a load (I didn't try connecting the adapter to the calculator), and the meter immediately went to around the 20V mark! Even so, this worked to some degree, since the battery pack had a charge in it when I got it; of course, the battery understandably got hot during charging, according to the previous owner, so he didn't charge it often.
Just recently, I bought a genuine HP 82002A charger on CraigsList. When I got it, I decided to test the voltages from it, unloaded, using a Triplett 310 VOM. The side which powers the calculator during charging measures out to what seems like a proper 4.5V or so. The set of pins which charge the battery (marked with a '+'), however, seems to output closer to 16V! Is this normal for this portion of the charger while unloaded, or has something gone wrong inside the unit?
As an aside, how are the accessories supposed to be arranged within the hard case? I see a portion which is presumably meant for the power supply, but the 82002A I have doesn't have the same shape (nor does any other original supply I've seen pictures of). Is the leather soft case supposed to go in there as well, and if so, where? Anyway, thanks in advance!