|Nominal power supply for an HP-75D and question about batteries|
Message #1 Posted by Tomás (España) on 27 June 2009, 2:20 p.m.
I am new here, and also new at the HP calculators world (I've been using for 25 years Casio's ones)
I have got an used HP-75D but it came without cable cord nor power supply. I guess my friend had it retired for several years, probably since he left the USA.
My questions are:
1) Which power supply does this unit need to work? (there is no signal nor label indicating it) (I have dismounted the calc from the pod too, to check) I am in Spain now, and here we have AC 220V@50Hz, moving towards 230~240V@50Hz. Also, don't know if there was a power transformer and then the unit needs DC at, let's say, 12V or so.
Reading http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=910 it seems it is 110V@60Hz minimum 2A, but would like to be sure to avoid damaging the HP-75D.
2) At the back of the pod there are 2 empty slots. Inside both, one can read: "PROPER OPERATION REQUIRES BATTERY IN THIS LOCATION". My doubts are:
a) are they really needed to work, or they are only needed if you don't want to lose your programs/data stored in the RAM if you un-plug the power cord?
b) if they are needed, could you give me the technical details or model of that batteries to look for them?
I find rare there is no written indication of these data in the calculator.
Excuse my poor english, and nice meeting you in this nice site!