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The digits on the display can hardly be read

I changed the battery (LR44 battery)but things didnn't change. The contrast doesn't change pressing 2ndF and up arrow one after the other. Can you help me?

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It just went display, changed batteries and still nothing. I was using it when this happened.

It is possible that the calculator went dead because the main batteries were depleted. However when you change the main batteries, it is often the case that the display contrast changes, and may become too light for you to see anything. If that is the case, you can increase the contrast of the screen.
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How can i change the contrast of the display?

Hi ik12364,

The Hp 10s doesn't have contrast control. You probably need to change the button cell battery LR44. This battery only last 3 years, if your lucky under normal use. No telling how long it sat in a warehouse or, on the shelf. If replacing the battery does not work then you may have a defective screen. HP should replace it, if you had it less than a year of purchase date. If you have any more questions about this calculator just post a comment about your inquiry and, I'll be glad to respond.

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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.

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Hope it helps.

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