Mark Levinson N 51 - Manual (Page 19)

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Nº51 Media Player Getting Started
2. Using a Phillips screwdriver, remove the two screws from the
battery compartment cover, then remove the cover.
3. Remove the old batteries in the battery compartment.
4. Insert two AAA alkaline batteries. Make sure the batteries are
correctly inserted observing the proper polarity.
5. Align the battery compartment cover with the guide on the
bottom of the remote control.
6. Replace the two screws removed in step 2.
7. Properly dispose of the old batteries.