Icom IC-12GAT Instruction Manual page 19

BASIC OPERATION 7.
E ACTIVATING VXO To activate VXO, follow the instructions below
and refer to the diagrams.
1) Remove the battery pack from the transceiver.
2) Remove 4 screws from the rear panel of the
transceiver (1)
4) Slowly pull the front panel up (3) and out (4).
Do not pull apart the speaker wires.