Hardware Maintenance Manual
Page 73
... a FRU, do not turn on page 115. 8. Before servicing ThinkPad T420s and T420si models Removing the SIM card: © Copyright Lenovo 2012 67 Where you are loose inside the computer. You may request that Lenovo installs an Optional-service CRU according to return the defective part that ..., unplug all screws, springs, and other small parts are available from electrical outlets, remove the battery pack, and then disconnect any FRU, review Chapter 7 "FRU replacement notices" on page 63. 3. Verify this by using an electrostatic discharge (ESD) strap (P/N 6405959). For information...
... a FRU, do not turn on page 115. 8. Before servicing ThinkPad T420s and T420si models Removing the SIM card: © Copyright Lenovo 2012 67 Where you are loose inside the computer. You may request that Lenovo installs an Optional-service CRU according to return the defective part that ..., unplug all screws, springs, and other small parts are available from electrical outlets, remove the battery pack, and then disconnect any FRU, review Chapter 7 "FRU replacement notices" on page 63. 3. Verify this by using an electrostatic discharge (ESD) strap (P/N 6405959). For information...