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はじめに

The CMOS battery maintains the time, date, hard disk and other configuration settings in the CMOS memory. When your CMOS battery dies, your system settings will be lost.

必要な工具と部品

1. 手順1 How to unplug and discharge before repair
  Power down your PC and remove the power cord from the back.
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2. 手順2
  Press and hold the power button for about 10 seconds, then release.
  
  This helps drain any remaining power stored in the capacitors, so that you can safely work on the internal components.
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1. 手順3 Dell Optiplex GX620 Side Panel Disassembly
  With the computer standing upright, firmly pull on the tab at the back of the computer.
  
  When the side panel pops free, gently pull the panel away from the computer.
  
  If you have trouble freeing the side panel from the case, you may need to pull the tab a bit harder.
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1. 手順4 Removing the CMOS Battery
  Insert a tool beside the battery and gently pry the battery out.
  
  Using a screwdriver to pry open anything can harm your device. Instead, use a spudger or a plastic opening tool.
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