1160 System Board Assembly And Fan Assembly - Lenovo ThinkPad Edge E420 Hardware Maintenance Manual

Removal steps of speaker assembly
When installing: Attach the speaker assembly and route the cable as shown in the following figure, and
make sure that the speaker connector is attached firmly.

1160 System board assembly and fan assembly

Important notices for handling the system board:
When handling the system board, bear the following in mind.
• The system board has an accelerometer, which can be broken if several thousands of G-forces are applied.
Note: Dropping a system board from a height of as little as 6 inches so that it falls flat on a hard bench can subject
the accelerometer to as much as 6,000 G's of shock.
• Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite.
• If a system board is dropped, you must test it, using PC-Doctor for DOS, to make sure that the HDD Active
Protection System™ still functions.
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Chapter 8 Removing and replacing a FRU
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