The calculator's backup battery sits in its own compartment and is held in place with a single screw. On the TI-89, to change the contrast, press ◆ + or – to adjust the contrast as necessary. You may have to repeat this process several times, pressing 2nd and the corresponding arrow key until your screen has been returned to normal. Press the 2nd button on your calculator, then either the ▲ arrow key to darken the display or ▼ arrow key to lighten the contrast. Sometimes after changing your battery your calculator home screen contrast may be very dark or very light and you will have difficulty seeing characters on the screen. If you were receiving a warning message about low batteries before changing the batteries, you should no longer see this message. Once you have finished replacing all the batteries, place the battery cover on the back of the calculator, then power up the graphing calculator by pressing the ON button. Also, never mix rechargeable and non-rechargeable batteries. For best results, don’t use both old and new batteries in the calculator. Ensure that the + and – ends are placed correctly.
If you remove all batteries at once and then replace them with new batteries, you run the risk of losing your calculator programs. The best way to replace the batteries is to remove each battery individually, leaving the other three batteries intact, and replacing the battery you removed with a new battery, repeating for each of the four AAA cells. Remove one battery, replace with the new battery, then proceed on to the next battery.
0 kommentar(er)
