Lenovo C2 Series Hardware Maintenance Manual page 56

Note: It may be helpful to place the computer face-down on a soft flat surface for this procedure. Lenovo
recommends that you use a blanket, towel, or other soft cloth to protect the computer screen from scratches
or other damage.
To replace the rear I/O module
Step 1. Remove any media (disks, CDs, 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 optical drive. Refer to "Replacing the optical drive".
Step 5. Remove the hard disk drive cover. Refer to "Replacing the hard disk drive".
Step 6. Remove the speaker cover. Refer to "Removing the speaker cover".
Step 7. Remove the computer cover. Refer to "Removing the computer cover".
Step 8. Remove the EMI cover. Refer to " Removing the EMI cover".
Step 9. Remove the 2 screws that secure the rear I/O module to the motherboard and lift it up gently.
Step 10. Disconnect the power cable from the motherboard and the TV antenna cable(s) from the TV tuner
card.
Step 11. Remove the screws that secure the rear I/O module to the metal bracket and slide it out to remove.
For models C220 and C225 refer to the illustration below. (2 screws)
For models C320 and C325 refer to the illustration below. (3 screws)
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Lenovo C2/C3 SeriesHardware Maintenance Manual