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Table 22. Removal steps of DC-in connector, base cover, fan, digitizer pen case, and pen switch assembly (continued)
Step Screw (quantity) Color
Torque
11
M2 × 3.5 mm, at-head, nylon-coated (1) Silver
0.181 Nm
(1.85 kgfcm)
When installing:
• Before you attach the fan assembly to the computer, apply thermal grease, at an amount of 0.2 grams, on the
part marked a as in the following gure. Either too much or too less application of grease can cause a thermal
problem due to imperfect contact with a component. You need to peel the thin lm off from the rubber b .
• Make sure that the DC-in connector, the fan connector, and the pen switch connector are attached to the system
board rmly.
a
b
a
Applying labels to the base cover:
The new base cover FRU is shipped with a kit containing labels of several kinds.
Note: If the Windows Authentication label (COA)
2 is attached to a part that is replaced, return the old part
with the label attached to the customer, or provide a letter to the customer stating what the label was
originally on the system and what the label part number, serial number, and product key were.
When you replace the base cover, you need to apply the following labels:
19
Homologation label
20
Product label
The following labels need to be peeled off from the old base cover, and need to be put on the new base cover.
1
China telecom label
2
Windows Certicate of Authentication label (COA)
3
SIM label
4
BTY word label
5
Asset tag
6
IMEI label
7
Brazil WWAN label
88 ThinkPad X220 Tablet and X220i Tablet Hardware Maintenance Manual