hp 11c

[Lewis Martin]

I had taken out the batteries of one of my hp11c and when i replaced with new batteries none of the keys work the display is stuck at 0.0000 with the word "begin" showing under the 0.0000 can anyone tell me what the problem may be?

[Vieira, Luiz C. (Brazil)]

Hello, Lewis.

Have you tried the the reset? Maybe a single short-circuit betwen battery terminals (DO NOT REMOVE BATTERIES; JUST A SINGLE, LESS-THAN-ONE-SECOND SHORT CIRCUIT) should result in normal operation.

If you want to keep memory contents, try something else. There is a procedure explained in the manual (appendixes) that mentions pressing [ON] [C] (or [ON] [D]) keys simultaneously, "...should your calculator do not respond to any key pressing...". This procedure should be tried more than one time.

Let us know if things got back to normal.

Best regards.

[Raymond Del Tondo]

Hi,

when my 11C had the same problem, I finally removed the batteries.
If you don't remove them, you'll short-circuit the batteries, not only the capacitors inside the calc.
Since those coin cells are all but cheap,
I'd suggest to take them off before proceeding;-)

Regards,

Raymond

[O.J.M.]

I can only speculate as to the actual reasons (electrostatic discharge risk?), but I would leave the batteries in, if only because HP said so. The following is taken directly an appendix from my old manual for the HP-15C (the 12C manual also says the same thing):

"If the calculator still does not respond to keystrokes, leave the batteries in the compartment and short the battery terminals together. (The batteries must remain in place to prevent possible internal damage to the calculator.) With a paper clip or piece of wire, briefly connect the terminals. Only momentary contact is required. The terminals are matching metal strips, or a combination of one spring and one hard edged tab located at either end of the battery compartment. After you do this, the contents of Continuous Memory will be lost, and you may need to press the ON key more than once to turn the calculator back on."

[Massimo Gnerucci (Italy)]

You're right!

It says the same thing on each of the 10 series manuals.

[Raymond Del Tondo]

Agreed.

Nevertheless it worked for my 11C,
while all methods described in the manual didn't help then...

Raymond

[Lew]

thanks everyone i got it working by the suggestion of pressing on c and on d i didn't do the short circuit but thats good to know since i have several calcs 15c and 12c's
thanks again

[Vieira, Luiz C. (Brazil)]

For clearing the information: it's enough pressing [ON] and [D] keys; in the 12C, [ON] and [PMT] (they share the same physical position). I was not sure about which pair was the actual par for the job.

Bes regards.