5.Insert the two new batteries on top of the ribbon tab, taking care to position them correctly according to the plus (+) and minus (-) terminals, as shown below.

6.Replace the cover.

7.Set the battery replacement switch to NORMAL OPERATION.

If nothing happens when you press [ON]:

*Setting the battery replacement switch to REPLACE BATTERIES shuts off power to the unit. Check that the battery replacement switch is set to NORMAL OPERATION.

*Repeat the above battery replacement procedure step by step.

*After following the above battery replacement procedure, the LCD contrast setting which is set by user will be back to its default mode.

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Sharp OZ-650, OZ-640, OZ-630 operation manual If nothing happens when you press on