HP 12C Bedienungsanleitung

Andere Handbücher für 12C

20

Inhaltsverzeichnis

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HP 12c Calculator - Resetting the Calculator

Description

Resetting the calculator using the keyboard

Resetting to drain the capacitor

Other solutions

Description

Sometimes a calculator will lock up or will not respond correctly. The calculator may

require a reset for a variety of reasons. These resets will erase the memory on the

calculator and restore the calculator’s defaults. For this reason, it is important to back

up any critical data.

Resetting the calculator using the keyboard

The easiest reset is done from the keyboard. To reset the calculator, follow the

procedures below in the order presented.

1. Press ON to turn off the calculator.

2. Press and hold [ - ].

3. Press and release ON.

4. Release [ - ].

5. The screen will display “Pr Error”

6. The calculator will reset to the default settings, and the memory will be

erased.

If the above reset did not restore the calculator to normal, continue to the next

section.

Resetting to drain the capacitor

If the calculator is still performing unexplained errors or will not turn on, it might have

a static charge. This means the capacitor is full. The previous reset will not drain the

capacitor. With this calculator, there are two options for draining the capacitor. The

option to use is dependent upon the serial number of the calculator to be reset. The

first option is a paperclip reset.

Paperclip reset

A paperclip reset can be performed on all HP 12C calculators with serial numbers

before CN11500001. This will include serial numbers that start with numbers or with

other letters. These calculators will have three 1.5 volt button cell batteries. Follow

these steps for calculators in this serial number range:

1. Remove the battery door.

2. Take the batteries out.

3. Take a paper clip and bend it out enough to cross over from one terminal to

the other.

4. Hold the paper clip across the battery terminals for approximately ten

seconds.

5. Replace with a fresh set of batteries, being sure to follow the polarity

assigned. Note the picture beside the battery cover.

6. Replace battery door.

7. Turn on the calculator. The display should read "Pr Error". Press and release

the ON key twice.

Coin reset

A coin reset can be performed on all HP 12C calculators with serial numbers after

CN11500001. These calculators will have one CR2032 battery.

1. Remove the battery door.

2. Tap the calculator gently into your palm to remove the battery.

3. Place a small battery-sized coin (penny or a dime US) flat into the battery

compartment. Hold the coin in place with your finger.

4. While holding the coin, turn the calculator over, press the ON key, and hold for

10 seconds.

5. Remove the coin.

6. Replace the battery, being sure to follow the polarity assigned. Note the

picture on the calculator.

7. Replace the battery door.

8. Turn on the calculator. The Display should read “Pr Error”. Press and

release ON twice.

Other solutions

If the calculator did not display the "Pr Error" message after resetting, or it did not

correct the error, then remove the batteries for 24 hours.

NOTE:

The batteries must be removed for at least 24 hours to drain the capacitor completely.

After letting the calculator sit without batteries for at least 24 hours, replace with

fresh batteries.

If the calculator continues to malfunction, it may need to be sent in for repair.