Symptom Cause Solution
Speaker does not
operate. Talk button
lights amber when
pressed.
Speaker switch turned off,
volume knob turned all the
way down, or channel
switch set to unused
channel.
Adjust controls
appropriately.
Speaker plug or wiring has
come loose.
Make sure speaker is
connected internally.
Plug P3 missing on circuit
board.
Plug P3 must be installed in
jack J3 if the EB-TW or EB7-
4W options are not used.
Hum or buzz in system
Inductive pickup caused
by close proximity of this
speaker station or
connected stations to
power lines or
transformers.
Relocate the offending unit
or wiring. If the cable run is
exceptionally long, consider
adding and using the EB7-
4W four-wire option
module. (Requires an
additional four-wire
interface at the opposite
end of the “long run.”)
System feedback
(Acoustical)
Intercom level control at
this station or another
station is set too high.
Adjust.
Sidetone null control at
this station or another
station is not adjusted
correctly.
Adjust. Refer to the chapter
“Operation.”
Channel not terminated.
Set the main station or
power supply termination
switch for that channel to
the on position.
Channel switch set to an
unconnected channel.
If only one intercom line is
connected, set option
switch #1 to the on or
closed position to link both
channel switch positions to
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