Telex Airman 8, Maintenance & Overhaul Manual

Page: 40 / 52

40 Maintenance Airman 8
3.1.4.4 Microphone Sensitivity Adjustment
The microphone gain has been factory-adjusted to the nominal level required for normal
radio operation. Microphone sensitivity is adjusted by turning the gain adjustment control.
To adjust the microphone , do the following:
1. Rotate the boom mic fully clockwise until the microphone gain adjustment access
hole is aligned and open.
2. Insert a 2mm x .5mm flat-bladed screwdriver into the gain adjustment access hole.
NOTE: If gain adjustment access hole is properly aligned, the screwdriver can be inserted
approximately 1/2 inch into the hole. If not properly aligned, the screwdriver only
inserts approximately 1/8 inch into the hole.
3. Turn the gain adjustment potentiometer clockwise to increase the gain.
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OR
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Turn the gain adjustment potentiometer counterclockwise to decrease the gain.