Cleaning Rear Dust Screen - Lenovo 90H9 Hardware Maintenance Manual

Cleaning rear dust screen

To replace the system fan:
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 computer cover. Refer to "Removing the computer cover".
Step 5. Press then pull the out the rear dust screen as shown.
Step 6. Cleaning tips:
a. Us a brush gently brush through the dust screen to remove the dust.
b. If cleaning the dust screen with clean water, make sure you dry the
dust screen completely before put it back.
Step 7. To install the rear dust screen:
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