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• “1100 Keyboard bezel assembly” on page 75
• “1110 Bluetooth daughter card (BDC-3.0)” on page 77
• “1120 Backup battery” on page 78
• “1130 Smart Card or Smart Card dummy spacer” on page 79
• “1140 Speaker assembly” on page 81
• “1150 Thermal module” on page 83
• “1170 LCD unit” on page 86
• “1180 Base cover assembly” on page 89
Table 33. Removal steps of I/O sub card
2
1
1
Step Screw (quantity) Color
Torque
1
M2 × 7 mm, wafer-head, nylon-coated (2) Silver
0.181 Nm
(1.85 kgfcm)
When installing: Make sure that the connector is attached rmly.
1200 System board assembly, magnesium structure frame, and modem
daughter card (MDC)
Note: The system board does not contain the Ethernet port, the ac power connector, and the modem port.
For the Ethernet port, see “1190 I/O sub card” on page 91. The ac power connector is installed on the
magnesium structure frame. If the computer is equipped with an MDC, the modem port is also installed on
the magnesium structure frame.
For access, remove these FRUs in order:
• “1010 Battery pack” on page 60
• “1020 Serial Ultrabay Enhanced device or travel bezel” on page 61
• “1030 DIMM slot cover” on page 62
• “1040 DIMM (bottom slot)” on page 63
• “1050 Hard disk drive slot cover, hard disk drive (HDD) and HDD rubber rails or solid state drive (SSD)
and storage converter” on page 65
• “1060 Keyboard” on page 67
• “1070 DIMM (upper slot)” on page 70
• “1080 PCI Express Mini Card for wireless LAN” on page 71
• “1090 PCI Express Mini Card for wireless WAN” on page 73
92 ThinkPad T520, T520i, and W520 Hardware Maintenance Manual