Einleitung
Use this guide to replace your CR2032 PRAM battery.
Werkzeuge
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            Lay the iMac display-side down on a flat surface. 
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            Loosen the three Phillips screws securing the rear panel to the iMac. 
 
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            Lift the rear panel slightly near the bottom of the iMac. 
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            Pull the rear panel toward yourself and remove it from the iMac. 
 
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            Lift the AirPort card slightly by its plastic tab and pull it straight away from its socket. 
 
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            Insert the flat end of a spudger between the body of the AirPort card and its antenna connector. 
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            Push the spudger away from the AirPort card to disconnect the AirPort antenna. 
 
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            Slightly lift the AirPort bracket off the logic board. 
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            De-route the AirPort antenna through the slot in the AirPort bracket. 
 
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                            Abschluss
                          
                          To reassemble your device, follow these instructions in reverse order.
Some models (with light sensor) have only the two outboard screws.
Robert Huber -