Reverse this procedure to install the RTC battery. When installing the disc cell RTC battery, make
sure the “+” sign faces up.
Base enclosure
Description Spare part number
Base enclosure (includes 4 rubber feet, battery lock latch, battery release latch, and RJ-45
cover)
720534-001
Before removing the base enclosure, follow these steps:
1. Turn off the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Disconnect the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
4. Remove the battery (see
Battery on page 41).
5. Remove the service door (see
Service door on page 42).
6. Remove the mSATA SSD (see
mSATA SSD on page 43).
7. Remove the hard drive (see
Hard drive on page 46).
Remove the base enclosure:
1. Remove the front rubber feet (1).
The rubber feet are included in the Rubber Kit, spare part number 720559-001.
2. Remove the seven Phillips PM2.5×5.5 screws (2) in the that secure the base enclosure to
the computer.
Component replacement procedures 53
