Lenovo IdeaCentre B550 All-in-One - Manual (Page 44)

Step 8. Remove the seven screws that secure the EMI cover to the chassis.
Step 9. Lift up the EMI cover up to remove it.
Step 10. To reinstall the EMI cover:
a. Line up the EMI cover with the mounting holes on the chassis and secure it with the seven
screws.
Step 11. Reattach the middle cover, optical drive, computer stand and the rear cover.
Replacing the speaker system
Note: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover.
To replace the speaker system:
Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating
system, and turn off the computer and all attached devices.
Step 2. Unplug all power cords from electrical outlets.
Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O)
cables, and any other cables that are connected to the computer. Refer to “Left and right view”
and “Rear view” for help with locating the various connectors.
Step 4. Remove the rear cover. Refer to “Removing the rear cover”.
Step 5. Remove the computer stand. Refer to “Removing the computer stand”.
Step 6. Remove the optical drive. Refer to “Replacing the optical drive”.
Step 7. Remove the middle cover. Refer to “Removing the middle cover”.
Step 8. Remove the EMI cover. Refer to “Removing the EMI cover”.
38 IdeaCentre B550–B555Hardware Maintenance Manual