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Replacing the card reader
Attention:
Do not open your computer or attempt any repair before reading and understanding the Chapter
1 “Read this first: Important safety information” on page 1.
To replace the card reader, do the following:
1. Remove any media from the drives and turn off all connected devices and the computer. Then,
disconnect all power cords from electrical outlets and disconnect all cables that are connected to the
computer.
2. Remove the back cover. See “Removing the back cover” on page 90.
3. Remove the computer cover. See “Replacing the computer cover” on page 95.
4. Remove the system board shield. See “Replacing the system board shield” on page 98.
5. Locate the card reader. See “Major FRUs and CRUs” on page 31.
6. Disconnect the card reader cable from the card reader.
7. Remove the two screws that secure the card reader, and then remove the card reader from the chassis.
Figure 47. Removing the card reader
8. Align the two holes in the new card reader with the corresponding screw holes in the mounting studs.
Then, install the two screws to secure the card reader.
9. Connect the card reader cable to the card reader.
10. Reinstall the system board shield. See “Replacing the system board shield” on page 98.
11. Reinstall the computer cover. See “Replacing the computer cover” on page 95.
What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to “Completing the parts replacement” on page 116.
Replacing the serial connector module
Attention:
Do not open your computer or attempt any repair before reading and understanding the Chapter
1 “Read this first: Important safety information” on page 1.
To replace the serial connector module, do the following:
1. Remove any media from the drives and turn off all connected devices and the computer. Then,
disconnect all power cords from electrical outlets and disconnect all cables that are connected to the
computer.
2. Remove the back cover. See “Removing the back cover” on page 90.
3. Remove the computer cover. See “Replacing the computer cover” on page 95.
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ThinkCentre M900z Hardware Maintenance Manual
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