Lenovo 7812, Hardware Maintenance Manual

Page: 166 / 224

Replacing the power switch/LED assembly
This procedure describes how to remove and replace the power switch/LED
assembly.
1. Remove the computer cover. See “Removing the cover” on page 123.
2. Remove the front bezel. See “Removing and replacing the front bezel” on
page 128
3. Disconnect the power switch/LED assembly cable from the system board. See
the system board illustration for your machine type at “Locating parts on the
system board” on page 125.
4. Note the power switch/LED assembly cable routing and the position of the
two LEDs.
5.
Remove the switch and the LEDs from the bezel.
6. Route the cable for the new power switch/LED assembly through the hole in
the chassis and to the system board.
7. Install the new power switch/LED assembly into the bezel. Make sure that the
LEDs are in the correct position.
8. Connect the power switch/LED cable to the system board.
9. Reinstall the front bezel.
10. Go to “Completing the FRU replacement” on page 161.
Replacing the CMOS battery
This procedure describes how to remove and replace the CMOS battery.
If the CMOS battery fails, the date, time, and configuration information (including
passwords) are lost. An error message is displayed when you turn on the
computer.
Important
Refer to “Safety notices (multi-lingual translations)” on page 7 for information
about replacing and disposing of the battery.
CAUTION:
When replacing the lithium battery, use only Part Number 33F8354 or an
equivalent type battery recommended by the manufacturer.
1. Remove the computer cover. See “Removing the cover” on page 123.
2. Locate the battery. See the system board illustration for your machine type at
“Locating parts on the system board” on page 125.
3.
You might have to remove any PCI adapters that impede access to the battery.
4. Remove the old battery.
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Hardware Maintenance Manual