Wireless Intercom System Service Manual

CONTROLS and CONNECTIONS
FRONT PANEL (Refer to Figure 2)
Power ON/OFF Switch: Push this switch once to
turn power ON; push it again to turn the power
OFF.
Power ON Indicator: The Power ON Indicator is
illuminated when the Power
ON/OFF Switch is
pushed in the
ON Position. It remains illuminated
while the Transceiver is on.
Local
Headset Connector: 4 Pin XLR Connector
for InputJOutput. The headset jack will accept 6
different Telex Model Headsets. Compatible with
otherintercom headsets with four pin XLR connec-
tors that are wired as shown in Figure
1.
MICROPHONE
GROUND
BALANCED
AUDIO
OUT
MICROPHONE
AUDIO
Figure 1
Headset XLR Connector Wiring
1-2
Local Headset Volume: Adjusts volume
to Local
Headset. DOES NOT AFFECT MICROPHONE
GAIN.
Mic On-Push-to-Talk/Lock-to-Talk Switch:
Enables the local headset microphone audio func-
tion. NOTE: DOES NOT control base station RF
transmit.
Local Push-to-Talk Indicator: Will be il-
luminated whenever the talk function is on.
Local Microphone
Gain Control and Over-
modulation Indicator: A screwddver adjustable
control is provided
to control the input level ofthe
local headset mic. This input is protected
from
overloads by means of a gain compressor whose
operation
is signaled by the gain LED indicator.
Portable Enable Switches and Indicators: When
in the
"IN" position, the Enable switches allow the
user of the conesponding portable unit
to be heard
by others connected
to the system. When in the
"OUT" position, the respective portable will
be
muted, but this portable will still be able to hear all
other selected remotes and interfaces. The in-
dicators normally show the presence
of a portable
transceiver in use
on the channel corresponding to
that indicator.