MVC 121 • Installation and Operation
MVC 121 • Installation and Operation
Installation and Operation
2-6
Rear Panel Features and Cabling
MVC 121
ON
INPUTS
OUTPUTS
LEVEL
48V
ON
OFF
MAIN 3
LINE
MIC
RS-232
MUTE
Tx Rx
POWER
12V
0.5A MAX
L
1
2
R
3
1
2
3
4
1 2 1 2
MIXER/VOLUME
CONTROLLER
FIXED
L
R
MIC 1
MIC 2
VARIABLE
L
R
7
8
1
2
3
5
4
6
1
Power connector
— Connect the included 12 VDC external
power supply into the 2-pole 3.5 mm captive screw connector.
Be careful to observe the correct polarity.
Power Supply
Output Cord
Captive Screw
Connector
A
A
SECTION A–A
CAUTION
When connecting the power supply, voltage
polarity is extremely important. Applying power
with incorrect voltage polarity could damage the
power supply and the MVC 121. Identify the
power cord negative (ground) lead by the ridges on
the side of the cord or a black heat shrink wrapping
around it.
Do not tin the stripped power supply leads before
installing the captive screw connector. Tinned wires are
not as secure in the captive screw connectors and could
be pulled out.
The two power cord wires must be kept separate
while the power supply is plugged in. Remove
power before wiring.
To verify the polarity before connection, check the no load
power supply output with a voltmeter.
After making any adjustments to the MVC 121, either
via the front panel controls, SIS commands, or the
Extron Audio Products Control Program, wait at least
10 seconds after making those changes
before
disconnecting power to the MVC 121. Failure to
observe the 10-second timeout may result in those
adjustments not being saved.
2
Mic input DIP switch
—
Mic 1
and
Mic 2
inputs
are controlled via a DIP switch.
1.
Set the mic input
Level
according to the
microphone type:
a.
Wireless mic: Set the mic’s DIP switch to the
Line
position (On).
b.
Wired mic: Set the mic’s DIP switch to the
Mic
position (Off).
2.
Set the
48V
phantom power position according to
microphone type:
a.
Condenser mic: Set the mic’s DIP switch to the On
position.
b.
Dynamic mic: Set the mic’s DIP switch to the Off
position.
Condenser microphones require power. Dynamic
microphones
do not
require power.
When a mic’s input level DIP switch is set to “line”
level, that input’s
48V
phantom power is disabled
regardless of the “48V” phantom power DIP switch
setting of that input.
CAUTION
Never set an unbalanced dynamic microphone to
48V
, doing so may damage the microphone. For
condenser mics, verify that the mic will safely
operate at 48 VDC.
ON
LEVEL
48V
ON
OFF
LINE
MIC
1
2
3
4
1 2 1 2
2-7
im Vertrieb von
CAMBOARD Electronics
www.camboard.de
Tel. 07131 911201
Fax 07131 911203
