はじめに
このガイドを使って、iMac Intel 21.5インチ Retina 4K DisplayのPRAMバッテリーを交換します。PRAMバッテリーはロジックボードの裏側に付いています。そのため、交換するには、ロジックボードを取り出す必要があります。
必要な工具と部品
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この手順で使用する道具：iMac Intel 21.5" Cardboard Service Wedge$4.99
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iFixitの梱包用ボックスを使ってウェッジ用サポートを作ることができます。こちらから組み立てガイドを参照してください。
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iMacの作業を始める前に、コンピューターの電源を外して電源のキャパシタを放電するため約10秒間電源を押し続けてください。
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ゆっくりと2つのプラスチックの突起からバッテリーを押し出します。 （これにより、もう一方の端のスプリング接点に大きな圧力がかかります。）
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バッテリーの端が2箇所ある突起から外れたら、ソケットから上向きに傾けます。
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デバイスを再組み立てする際は、これらのインストラクションを逆の順番に従って作業を進めてください。
デバイスを再組み立てする際は、これらのインストラクションを逆の順番に従って作業を進めてください。
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3 件のコメント
Hmm. I don't see a single place in these instruction, including the parts needed list, that tells which battery is required. From one of the photos it looks like BR2032.
As I needed to replace the failing hard drive in my late 2015 21.5" iMac anyway, and the iMac is now nearly 8 years old, I figured I may as well replace the PRAM battery as well since I've got the screen off. The battery must be getting near its end of life anyway, right? And I don't want to have to open this iMac up again anytime soon. And there seems to be no way to tell what its voltage is without taking it out. So after going through this whole process and putting in a new battery (which registered 3.40 volts at installation), I measured the voltage of the old, original battery. 3.19 volts. I guess I could have waited another 8 years at this rate before replacing it! So if this helps anyone - as long as you keep your iMac plugged in, the PRAM battery in these models might last a good 16 years I guess. (I really wish that if they could not provide a way to measure the remaining life span or at least the voltage of the battery, they would have put it on the other side of the logic board!)
By the way, regarding BR2032 vs CR2032: Apple used BR2032 for the PRAM battery on these and many other iMac models, but the BR2032 is much more difficult to get hold of than the CR2032, as well as more expensive. (It's supposed to hold up better under the heat of the environment it's in.) However, I recently had to open a 2009 iMac again, two years after doing some prior work on it: beside the other work I had put in a CR2032 back then. The CR2032 I removed still had 3.14 volts after two full years in the 2009 iMac. So I don't think the CR2032 would hold up as long as a BR2032, but at that rate I suppose it would get at least 4 years of service before dropping too low.
