Removing And Replacing A Fru - Lenovo ThinkPad T61 Hardware Maintenance Manual

Removing and replacing a FRU

Removing and replacing a FRU

This section presents directions and drawings for use in removing and replacing a
FRU. Be sure to observe the following general rules:
1. Do not try to service any computer unless you have been trained and certified.
2. Before replacing any FRU, review "FRU replacement notices" on page 53.
3. Begin by removing any FRUs that have to be removed before the failing FRU.
4. Follow the correct sequence in the steps for removing the FRU, as given in the
5. When turning a screw to replace a FRU, turn it in the direction as given by the
6. When removing the FRU, move it in the direction as given by the arrow in the
7. To put the new FRU in place, reverse the removal procedure and follow any
8. When replacing a FRU, use the correct screw as shown in the procedures.
Attention: After replacing a 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 by using an electrostatic discharge (ESD) strap (P/N
6405959).
56
MT 8889, 8890, 8891, 8892, 8893, 8894, 8895, 8896, 8897, 8898, 8899, 8900, 8938, and 8939
An untrained person runs the risk of damaging parts.
Any such FRUs are listed at the top of the page. Remove them in the order in
which they are listed.
drawings by the numbers in square callouts.
arrow in the drawing.
drawing.
notes that pertain to replacement. For information about connecting and
arranging internal cables, see "Locations" on page 113.
DANGER
Before removing any FRU, turn off the computer, unplug all power cords from
electrical outlets, remove the battery pack, and then disconnect any interconnecting
cables.