Lenovo T420i manual DIMM in the slot on the underside of the computer

1060 DIMM (in the slot on the underside of the computer)

For access, remove these FRUs in order:

•“1010 Battery pack” on page 63

•“1050 DIMM slot cover” on page 69

Note: Your computer has two DIMM slots: one under the keyboard and another on the underside of the computer. If you install a DIMM in only one of the two slots, install it in the slot located under the keyboard.

Removal steps of DIMM (in the slot on the underside of the computer)

When installing: Insert the notched end of the DIMM into the socket. Press the DIMM firmly, and pivot it until it snaps into place. Make sure that it is firmly fixed in the slot and does not move easily.

70ThinkPad T420 and T420i Hardware Maintenance Manual