MODEL 2810E-2001 USER MANUAL
2810E-2001 UM
REV 3.0
21
feedback. When the operator dons the headset at the same volume level, the
acoustic feedback will no longer occur. The operator's head provides acoustic
isolation between the microphone and earphone of the headset. The same is true
for an occupant’s headset microphone and earphone.
To troubleshoot acoustic feedback issues first determine the source. One way to
quickly determine the source of the acoustic feedback is to cover each active
microphone with your hand one at a time. Another method is to adjust the volume
controls one at a time. The volume control that stops the feedback indicates the
source. For example, if the CHAMBER VOLUME control stops the feedback, the
problem is likely in an occupant’s headset or chamber speaker. Common sources
are feedback between the operator's headset microphone and the PANEL
SPEAKER of the 2810E-2001. If the operator wants to operate with the headset
and leave the PANEL SPEAKER on, Amron recommends the operator move away
from the 2810E-2001 by using the Amron Model 2822-28 Remote Walk-and-Talk
Module. This module provides an "extension" cord for the operator headset
allowing the operator to operate away from the 2810E-2001.
Crosstalk is caused by signal leakage between the microphone and earphone
wires in the communications cable. In a good cable with all the wires open (not
connected) the resistance between any two wires should be greater than 10 Meg-
Ohms. Over time, the cable can be damaged and this resistance drops to the
point that crosstalk can occur. When this occurs, the communication cable in the
umbilical should be replaced. For a temporary solution, you can try swapping the
position of the occupant’s earphone wires on the CHAMBER EARPHONE jack. If
you are using a banana plug, simply unplug the chamber earphone and rotate by
180 degrees before reconnecting. If this does not solve the problem and the
chamber wiring cannot be immediately replaced, then operate in 2-Wire mode until
a replacement umbilical can be used. Amron strongly recommends the use of the
shield, twisted pair communication cables.
5.3.8
PUSH-TO-TALK DOES NOT WORK
If used, check the connection to the handheld microphone. A common issue is
that the yellow banana plug is not properly seated in the PUSH-TO-TALK JACK. If
the operator is using the PANEL SPEAKER as the microphone with the PUSH-TO-
TALK BUTTON, make sure the SPEAKER SWITCH is turned on. If neither of
these solves the problem, there could be a broken wire inside the chamber
communicator. Open the front panel and inspect. If that does not resolve the
problem then contact Amron per section 2.2 for further assistance.