Specifications

C2985M-A (3/11) 11
Troubleshooting
If the following instructions fail to solve your problem, contact Pelco Product Support at 1-800-289-9100
(USA and Canada) or [phone] (international) for assistance. Be sure to have the serial number
available when calling.
Do not try to repair the unit yourself. Leave maintenance and repairs to qualified technical personnel only.
Table A. Troubleshooting the AUD-1 and the ALM-1
Problem Possible Cause Suggested Solution
Cannot enable the
accessory.
The accessory is not
correctly installed.
Ensure that the accessory is installed
completely and correctly.
The accessory is not
enabled.
Enable the accessory.
The accessory settings
were not saved.
Save the settings after configuring the
accessory.
The AUD-1 does not
respond.
There is a problem with
the wiring.
Ensure that the wiring is properly installed.
The sampling rate is set
incorrectly.
Set the sampling rate to 8 kHz.
The microphone you are
using is not a line-level
device.
Use a line-level microphone.
The audio signal is
weak.
There is no power to the
microphone.
Apply power to the microphone (refer to
Wiring on page 6).
There is no speaker
amplification.
Ensure that the line out wiring includes an
amplifier.
You are not using the
correct type of
transformer.
Use a 600-ohm impedance matching
transformer.
The wiring distance
between the audio
equipment may be too
long.
Test the equipment using a shorter wiring
distance.
The gain is not properly
adjusted.
If you are using an external amplifier and it
has an adjustable gain, increase the gain
until the signal is acceptable.
You are using a
consumer line-level
microphone.
Use a professional line-level microphone.
Add an external amplifier to your circuit and
or adjust the gain.
The audio signal is noisy. You are using a mic-level
microphone rather than
a line-level microphone.
Use a line-level microphone.
Add an external amplifier that will bring the
signal to line level.