Question about HP 12c Calculator
Passes self test but screen flashes and buttons may be inoperative. Does not turn off It is a 15c - couldnt find that in your list of products
You can get rid of the flashing (usually due to memory overflow) by pressing [<-- left arrow] [ON] or [g] [CF] 9.
If you want to reset permanent memory
1.Press and hold [ON] then press [-]
2. release the [ON] key, then the [-] key.
Screen displays Pr Error.
Press any key to clear display.
Hope it helps.
Posted on Sep 25, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
Automatic: The UPS performs a self-test automatically when turned on, and every
two weeks thereafter (by default). During the self-test, the UPS briefly operates the
connected equipment on battery.
Manual: Press and hold the button for a few seconds to initiate the self-test
REPLACE BATTERY LED ILLUMINATES
Replace Battery LED flashes and
short beep is emitted every two
seconds to indicate the battery is
Check that the battery connectors are fully engaged.
Weak battery. Allow the battery to recharge for 24 hours. Then, perform a self-test. If the
problem persists after recharging, replace the battery.
Failure of a battery self-test. The UPS emits short beeps for one minute and the Replace Battery LED
illuminates. The UPS repeats the alarm every five hours. Perform the self-test
procedure after the battery has charged for 24 hours to confirm the Replace
Battery condition. The alarm stops and the LED clears if the battery passes the
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