Lenovo ThinkPad i Series 172x ThinkPad 390 / i Series 1720 models Hardware Mai - Page 62
Backup Battery (RTC), Keyboard, Hard Disk Drive
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Step Size (Quantity) Head & Color Torque 1 M2 x 18L (1) Pan head, 2.0kgf-cm black Note: The screws do not separate from the modem board cover. Backup Battery (RTC) "Battery ASM" on page 49 "Modem Card" on page 53 Warning The lithium battery can cause a fire, explosion, or severe burn. Do not recharge it, remove its polarized connector, disassemble it, heat it above 100°C (212°F), incinerate it, or expose its cell contents to water. Dispose the battery as required by local ordinances or regulations. Use only the battery in the appropriate parts listing. Use of an incorrect battery can result in ignition or explosion of the battery. Use your thumb first to pull out the backup battery (RTC). Keyboard "Battery ASM" on page 49 "Hard Disk Drive" on page 49 To remove the keyboard: 1. Use a flat-bladed screwdriver to release the latches to lift the middle cover away. 54 ThinkPad 390/i Series 1700