Sharp ZQ-190 Operation Manual page 33

(2) Precautions when replacing the memory backup battery
If the memory backup battery is replaced when the operating batteries are
depleted, the memory contents will be lost. Make sure the operating
batteries are not depleted. If the operating batteries are depleted, first
replace these before replacing the memory backup battery.
(3) Replacing the battery
1. Press to turn the power off.
OFF
2. Loosen the screw (counterclockwise) and remove the
battery holder cover on the back of the unit.
3. Remove the memory backup battery seal.
4. Remove the used battery using a ball-point pen or
similar object.
• Do not use a mechanical pencil or sharp pointed object.
5. Install a new battery with the positive side (+) facing up.
6. Replace the seal and the holder cover and secure the cover with the
screw.
7. The power will be turned on 2 to 3 seconds after
If the power does not come on, press the RESET switch. If nothing
appears on the display again, replace the operating batteries.
is pressed.
ON
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