420 Series 4-1
4.1 General
This section explains how to disassemble the computer and replace Field Replaceable Units
(FRUs). It may not be necessary to remove all the FRUs in order to replace one. The chart
below is a guide to which FRUs need to be removed in order to remove others. Always start
by removing the battery pack, then follow the lines on the chart to determine which FRU you
must remove next in order to repair the one you think is causing the computer to operate
improperly.
❏ Battery Pack
❏ Optional PC card
❏ Optional memory card Display ❏ FL inverter Board
❏ FDD/CD-ROM drive Mask ❏ LCD Module
❏ Hard disk drive ❏ FL
❏ Keyboard
❏ Sub-battery
❏ VGA board
❏ RTC battery
❏ Top cover with display assembly
❏ Sound board
❏ Membrane switch
❏ Speaker
❏ AC PS unit
❏ Infrared board
❏ System board
❏ Fan
❑ Microphone
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