Braun ET55 buttons do not work

I don't know which particular calculator model you have, but for an HP-12C, the manual says the following:
Digit Separators
As a number is keyed in, each group of three digits to the left of the decimal point is automatically separated in the display. When the calculator is first turned on after coming from the factory - or after Continuous Memory is reset - the decimal point in displayed numbers is a dot, and the separator between each group of three digits is a comma. If you wish, you can set the calculator to display
a comma for the decimal point and a dot for the three-digit separator. To do so, turn the calculator off, then press and hold down the [.] key while you press [ON]. Doing so again sets the calculator to use the original digit separators in the display.

2.4507E-4 is scientific notation for 2.4507 times ten to the minus 4, or .00024507.

Take the 2.4507 and move the decimal point, to the left if the exponent is negative, to the right if it is positive, the specified number of positions.

If the magnitude of the result is too small or too large, the calculator will automatically switch to scientific notation. Imagine a number that has more than 12 digits to the left of the decimal point. How is that going to fit onto the display? Or a number that is 0 followed by the decimal point followed by 12 0s and then some significant digits?

Hi,

P12c display from Comma to Point This document describes how to change the display of the decimal point on the HP 12C (HP12C) Calculator from a comma (commas) back to a decimal point.
Instructions

1. Turn off the calculator.
2. Hold down the decimal point.
3. Continue to hold the decimal point key, while turning on the calculator.

The comma should change back to a decimal point.
Explanation The comma is the European equivalent of the decimal point.
This procedure is also applicable to HP12CP (Hewlett-Packard 12c Platinum) and HP12CPA (Hewlett-Packard 12c Platinum 25th Anniversary Edition).

Let me know, if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

"Fix" indicates the calculator is rounding results. Press "Fix" followed by "." (decimal point) to remove the fixed decimal setting.

To put the calculator back to NORMAL mode, try [2nd][FIX] then [ . ] (decimal point).

press black/orange button, press =(DISP) button and enter 0-9 for digits to be displayed after decimal point.

Input the following and try:

1. Press 2ndF and . the point button. This changes the screen to FIX DEG
2. Press 2ndF +/- 2 Answer shown is to 2 dec. pl.
3. If you want it to 5 decimal places, Press 2ndF +/- 5 answer shown is to 5 d.p. and so on
   

For normal, just take calculator out of FIX so just DEG shows.

Couldn't find you a YouTube video, so text will have to do.


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Followed by a digit key, it probably set the display to fixed decimal notation with the specified number of digits following the decimal point.

No, it didn't magically fix a broken calculator :-)

I called Canon customer support. There is a tiny reset button on the lower back area of the calculator. Simply stick a small object in there to reset the calculator and you should be as good as new! Worked for me!

Turn the calculator off, then press and hold down the .(decimal key) while you press the on button. Doing so again sets the calculator to use the original digit separators in the display