Mircom

When a visitor places a call and begins to talk, he or she cannot hear the tenant. Why?

The speaker may not be working correctly. Unlock the panel and perform a visual inspection of the speaker:

• Look for loose wires or loose solders as well as damaged components.

• Check that the volume in the panel speaker is set properly. VR4 (volume control) is the adjustment potentiometer for the standard board and VR2 is the adjustment potentionmeter for the slim line board; both are located at the bottom of the board. Adjust the potentionmeter clockwise to increase the volume.

If there are no loose wires and the volume in the panel speaker is set properly, there may be a problem with the speaker impedence. To see if this might be the problem, follow the instructions below:

1. Turn the system power off and disconnect the white and green speaker wires from the main
board.

2. Set your meter to ohms and set the scale to 50 ohms or higher.

3. Place the meter leads on the white and green speaker wires. The meter should read between
40-45 ohms. If your readings are different please contact Mircom’s technical support department for assistance.