12c won't turn on --- options?


It has good batteries. What are the resurrection steps to try?

This is a single 2032 battery non-12c+ made in China a few years ago.

Not worth major surgery :-) but thought it would be good to try a couple of things.

So, batteries are NOT the problem.

Next? :-)



Can you check the current drain, idle (no power), button pressed, etc? It may give an indication of any anomaly and narrow down possible fixes.



All keys 'click'? If one makes permanent contact, it wouldn't turn on.


Perhaps contrast is down. Stuck key?

Edited: 27 Oct 2011, 1:00 p.m.


Did you remove the battery and short the contacts inside the calculator together for a few seconds?


-- No stuck keys

-- yes, shorted the internal contacts with a coin and then with a paper clip.

Might just be dead, but thought I would hunt for magic tricks.


are the feet and battery door in good shape? use it for parts.


Not sure the age of the unit you have but a very common problem with early one cell 2032 units was a really *bad* design in the battery contacts.

The + contact on the left side gets bent out of position, failing to make contact. Remove the cell and look for the contact to protrude into the circular area taken up by the cell. If you don't see the contact while looking straight down into the cell area, that's the problem.

FWIW, the design was later modified.


For the record, the problem suggested by Randy was the reason it would not turn on.

The small contact that touches the side of the single 2032 battery cell was not bending out enough into the cell receptacle to make contact with the battery.

A slight amount of bending and it made contact.

Voila. A working 12c.

Thanks all.

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