User`s guide

Frequently Asked Questions
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Q. When a visitor places a call and begins to talk, he or she cannot hear the resident. Why?
A. The speaker may not be working correctly. Unlock the panel and perform a visual inspection of the speaker:
• Look for loose wires 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 impedance. 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.
Q. The LCD display has no display or the display has dark blocks on it. Why?
A. There may be a problem with the contrast level. VR1 (contrast control) is located on the back of the keypad/
display board. Adjust the potentionmeter counter-clockwise for a darker display and clockwise for a lighter display.
Q. Why can’t I find/change the ring pattern in programming mode?
A. Because the ADC system requires a dedicated telephone line, it is not equipped with a ring pattern option. The
ring pattern is dependent on your local telephone company.
Q. I misplaced the key for the telephone access system. How do I obtain a replacement?
A. The Mircom key part number is LK-304. Contact your local distributor or Mircom Head Office for a replacement.
Q. What happens when the visitor gets an answering machine when trying to contact a resident?
A. The system will allow the visitor to leave a message on the answering machine.