Question about Canon P23-DHV Calculator

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Display can I adjust the contrast on the display

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There is no control for contrast adjustment. But if the display quality has changed, it is possible that electromagnetic interference (EMI) or static discharge may have affected the display. You can try to reset the unit by pressing the reset button on the bottom with a ballpoint pen tip, but you will have to reenter the date, time, and tax rate if you do this.

Posted on Apr 29, 2008

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2 Answers

Adjust screen brightness

Turn the calculator on, press and hold the 2nd button, then press the up-arrow button to increase the contrast or the down-arrow button to decrease the contrast. If you go too far, release both buttons, press and hold the 2nd button, and press the appropriate arrow button.

Sep 30, 2013 | Texas Instruments TI-82 Calculator

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Fx 115 es can't see the display

First, try adjusting the display contrast. Press SHIFT MODE down-arrow 6 then use the left/right-arrows to change the contrast. If that doesn't do any good, try replacing the battery.
Contrast adjustment is on page E-5 and the battery replacement instructions start on page E-71 of the manual.

Apr 05, 2012 | Casio FX-115ES Scientific Calculator

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TI89 dim display

Hi This problem can be fixed

Mar 20, 2012 | Texas Instruments TI-89 Calculator

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No display

It is possible that you have dimmed it.
To adjust screen contrast
  1. Press [SHIFT][MODE] to access (SETUP)
  2. What should be displayed (even if you cannot see it) is the left part of the screen capture below.
  3. By pressing the Down arrow the second page of options should be displayed (even if you cannot see it).
  4. Press 6 to open the contrast adjustment screen (you will not see it either).
  5. Press repeatedly on the [+] key until something appears on the screen.
If you followed these instructions correctly and failed to make the display visible, then there may be some hardware damage to your calculator.


Aug 13, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

I am a teacher. I have about 10 calculators that

It has two batteries CR2032. They should not be removed at the same time. There must always be one battery in the calculator. The calculator should be turned OFF when changing batteries.

Often after you change batteries the screen contrast may be too light and you cannot see anything. The contrast can be adjusted (lightened or darkened). As you adjust the contrast setting,a highlighted number in the upper right corner changes to indicate the current contrast setting; 0 is the lightest, and 9 is the darkest.
To adjust the display contrast:
1. Press and release the [2nd] key.
2. Use one of two keys: (UpArrow or DownArrow)
--- To increase the contrast (darken), press and hold [UpArrow]
---To decrease the contrast (lighten), press and hold DownArrow

Hope it helps.
Thank you for using FixYa.

Nov 23, 2009 | Texas Instruments TI-80 Calculator

1 Answer

When I connect my calculator to the overhead, the display is dark and will not show the proper display that is on the there a setting I need to change?

On the TI overhead screen, there is a dial. This is how you adjust the contrast. It sound like the contrast on the overhead display is too dark.

Aug 28, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

Utility programms not displaying well. when working on SAT. menu and other menus programming tools do not display well and some times flashing.

You can increase the contrast.
Press [MENU]. Use arrows to select [CONT] icon. Press [EXE] . Press arrow down to [CONTRAST]. Use + or - to adjust. You can also adjust color individually, or press [F1] to set the factory default.
If all this does not improve the display, you may have to install fresh batteries (main batteries).
Hope it helps.

Jul 02, 2009 | Casio CFX 9850GB Plus Calculator

1 Answer

Turned up display, but not dark enough to see display

No. You can adjust the contrast by pressing and releasing the 2ND key, then pressing and holding the Up key to increase the contrast. Obviously, you can decrease the contrast by using the Down key instead.

Jun 04, 2009 | Texas Instruments TI-85 Calculator

1 Answer

Low screen display contrast

Adjust the display contrast by pressing and releasing the 2ND key, then pressing and holding the Up key to increase the contrast or the Down key to decrease the contrast.

May 29, 2009 | Texas Instruments Calculators

1 Answer

Digit display

Adjust contrast [MENU] Arrow till [CONT] icon is highlighted. Arrow down to highlight CONTRAST. Press + ou - to adjust.
You can also adjust colors, if you have the color version.
It this does not work, chamge batteries (main batteries).
Hope it helps.

Oct 12, 2008 | Casio CFX 9850GA Plus Calculator

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