HP-41C and lost memory



#6

Hi,

my HP-41C (I obtained recently) has been not used in the last three weeks. When I turned on yesterday it losts his memory. Battery are ok, and the calculator seems to work fine (apart from the usual problem to stay ON only for two-three minutes before an auto shutoff).
Why did it lost his memory?
Can this due to the fact that I put the HP-41C in a TI-65 case (I'm joking of course, but maybe ...)?


#7

Ops the case is that of a SR-56.

Alfredop


#8

Maybe you held down the <- Backspace while turning it on? Or you coused some trouble inserting a module? I would clean the contacts inside the calc (autoshutoff seems to be too soon), and care for the battery contacts (and new batteries, of course).

Hope the problem doesn't return! Klaus


#9

As i learned from this forum (pity, i´ve forgotten which thread, but surely around 2 years old), there are two printed circuit boards inside the hp 41 connected together wich conductive rubber (zebra-strips). The failure of early shut-down is in the contact resistance at this rubber connector. take the 41 apart and clean thoroughly the golden contacts on the pcb´s where the rubber connector is located. Use fresh isopropylic alcohol and Q-Tips (see an earlier thread of what these useful things are!)therefore. after reassembly early shutdown, as well as total power fails should be history. It´s very simple to perform and by this little surgical intervention i already cured two 41´s.
Good Luck!


#10

One should also look at the zebra strips with a magnifier, one copper contact one one end shoted 2 contacts in my 41c.


#11

May be it's the 56 case. The 56 is a low end programmable from TI and the 41 is the top of the line HP. May be the calc just got mad at you.


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