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The CMOS battery (button cell) may have run out.
A CMOS battery is necessary to store BIOS settings in a computer. If you remove the rear cover of the PL series unit, you can find a button cell engraved with "CR2032" on the board, and that is the CMOS battery.
When this error occurs, it is recommended to replace the battery. | | | | 
| | | Compatible Battery | Service Life | Lithium battery CR2032
(Hitachi Maxell, Ltd.)
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| 5 years |
| | | NOTE | | - | The expected battery service life is 5 years, however the battery may die before then. It is strongly recommended that you replace the battery regularly. | | - | When the battery is replaced, the BIOS settings are initialized. Configure the BIOS settings again after replacing the battery |
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