How to turn off the microphone of Sony 198P camera?

Sony DSR-PD 198P camera turns off its microphone according to the following steps:

1. Install the battery for Sony DSR-PD 198P camera.

2. Turn on the camera power switch and put the camera in standby state.

3. Install the cannon port of the external microphone to the input cannon port of the camera.

4. Open the microphone setting switch cover and set F and G in the figure below to the middle position of INPUT 1. The camera will turn off the built-in microphone and use the microphone installed by INPUT.