Lenovo ThinkPad Helix 20CG Hardware Maintenance Manual page 76

2. Remove the SIM card, SD card, and smart card. See "Removing the SIM card, SD card, and smart
card" on page 46.
3. Remove the back cover assembly. See "1010 Back cover assembly, smart-card reader, and
smart-card-reader cable" on page 48.
4. Disconnect the cable of the built-in battery.
Removal steps of the I/O card and I/O-card cable
When installing: Ensure that the connectors are attached firmly.
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