Removing and replacing an fru – Lenovo IdeaPad U300s User Manual

Page 37

Lenovo IdeaPad U300/U300s/U400

Removing and replacing an FRU

This section presents exploded figures with the instructions to indicate how to

remove and replace the FRU. Make sure to observe the following general rules:
1. Do not attempt to service any computer unless you have been trained and

certified. An untrained person runs the risk of damaging parts.

2. Before replacing any FRU, review “FRU replacement notices” on page 32.
3. Begin by removing any FRUs that have to be removed before the failing

FRU. Any of such FRUs are listed at the top of the page. Remove them in

the order in which they are listed.

4. Follow the correct sequence in the steps to remove the FRU, as given in the

figures by the numbers in square callouts.

5. When turning a screw to replace an FRU, turn it in the direction as given by

the arrow in the figure.

6. When removing the FRU, move it in the direction as given by the arrow in

the figure.

7. To put the new FRU in place, reverse the removal procedures and follow

any of the notes that pertain to replacement. For information about

connecting and arranging internal cables, see “Locations” on page 98.

8. When replacing an FRU, use the correct screw as shown in the procedures.

DANGER

Before removing any FRU, turn off the computer, unplug all power cords from

electrical outlets, remove the battery pack, and then disconnect any of the

interconnecting cables.

Attention: After replacing an FRU, do not turn on the computer until you have

made sure that all screws, springs, and other small parts are in place and none

are loose inside the computer. Verify this by shaking the computer gently and

listening for rattling sounds. Metallic parts or metal flakes can cause electrical

short circuits.

Attention: The system board is sensitive to, and can be damaged by,

electrostatic discharge. Before touching it, establish personal grounding by

touching a ground point with one hand or using an electrostatic discharge (ESD)

strap (P/N 6405959) to remove potential shock reasons.

This manual is related to the following products:

IdeaPad U400