Mac mini (PowerPC) PRAM Battery Replacement
- Author: iRobot
- Difficulty: Moderate
The time and date, as well as other settings, are kept by the PRAM battery when your machine is off. Replacement battery is a CR2032 3v lithium button cell.
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You can skip this step if you bought your putty knife from iFixit. Putty knives purchased from iFixit come with pre-ground edges.
You'll need a putty knife in order to open the case. A 1.5 inch thin putty knife will work well, but you'll want to grind the edge down. Rub the putty knife's short edge back and forth on a sheet of all purpose rough grit sandpaper (100 grit will work fine) until it attains a beveled edge.
Place the mini upside down on a cloth and turn it so that the apple leaf faces you.
Insert the putty knife into the seam between silver outer case and the white plastic. If you have trouble, you can insert the putty knife at an angle or grind the knife's edge down further. Push the blade down until you meet firm resistance (roughly 3/8 of an inch).
If your mini has neither an Airport card nor a Bluetooth board, you can simply lift the optical drive up and away. Otherwise, you need to disconnect the Airport and/or Bluetooth antenna cables first.
With your free hand, pull the Bluetooth cable up from Bluetooth board and unplug the Airport antenna cable from the right of the Airport card. Caution: both of these connections are very small. When re-assembling unit after repair, you may want to remove the two screws holding the airport card to the assembly and lift the card up and out to re-attach the cables.
Push the PRAM battery in and pull it up. You'll have to push the battery in further than you'd expect in order to get it to pop free.
When inserting the new battery, make sure the side with writing along the edges faces the black plastic holder. You should also insure that the metal connectors make contact with the battery (you can bend them forward if they do not).