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Table 24. Removal steps of BDC-3.0
2
1
Step Screw (quantity) Color
Torque
1
M2 × 3 mm, wafer-head, nylon-coated (1) Silver
0.181 Nm
(1.85 kgfcm)
When installing: Make sure that the connector is attached rmly.
1120 Backup battery
For access, remove these FRUs in order:
• “1010 Battery pack” on page 60
• “1030 DIMM slot cover” on page 62
• “1060 Keyboard” on page 67
• “1100 Keyboard bezel assembly” on page 75
DANGER
Use only the battery specied in the parts list for your computer. Any other battery could ignite
or explode.
78 ThinkPad T520, T520i, and W520 Hardware Maintenance Manual