Page 1
MDA EQ Series Setup Guide
Installation
1. Turn off and disconnect all equipment from the power source.
2. (Optional) If desired, mount the MDA EQ on a 9.5, 6, or 3.5 inch deep rack shelf; a
projector mounting pole; or furniture.
3. Connect a composite video or an S-video source device to the Input connector.
4. Connect one or two video output devices to the composite video or S-video output
connectors.
5. (Optional) Connect a monitor to the Loop-Thru connector for passive loop-through.
6. Set the termination toggle switch:
о If a monitor is connected to the Loop-Thru connector, set the
switch to High Z (up).
о If no monitor is connected, set the switch to 75 Ohm (down).
7. Wire the provided power supply as shown below and connect it to
the 2-pole, 3.5 mm captive screw connector.
Power Supply
Output Cord
Orange Captive Screw
Connector
3/16” (5 mm) MAX
SECTION A–A
Ridges
Smooth
A A
Tie Wrap
CAUTION: Always use a power supply provided by Extron for the MDA EQ series. Use of
an unauthorized power supply voids all regulatory compliance certification and may
cause damage to the supply and the MDA.
The Extron® MDA EQ Series are compact mini distribution amplifiers available with
composite video or S-video and with individual output gain and equalization controls
that compensate for different cable lengths for each output. Each adjustment on the
MDA 4SV EQ model equalizes two outputs. The MDA EQ products are also line drivers,
able to equalize signals sent over 1000 feet (300 m) of Extron Mini High Resolution cable.
This guide provides basic instructions for an experienced installer to set up these
distribution amplifiers for operation.
VIDEO DISTRIBUTION CONTROLLER
GAIN EQ1GAIN EQ2GAIN EQ3GAIN EQ
4
LOOP-THRU
HIGH Z
75 Ohm
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CAUTION: The power supply must not be permanently fixed to the building structure or
similar structures.
The power supply must not be located within environmental air handling spaces or
the wall cavity.
The installation must be in accordance with the applicable provisions of the
National Electrical Code ANSI/NFPA 70, Article 725 and the Canadian Electrical Code,
Part 1, Section 16.
The power supply must be located within the same vicinity as the Extron A/V
processing equipment in an ordinary location, Pollution Degree 2, secured to a
podium, a desk, or an equipment rack within a dedicated closet.
8. Connect power cords to the input and output devices and turn on all equipment.
9. Adjust the potentiometers for output cable lengths (if needed).
о If using very short output cables, set all potentiometers to the default setting
(with the arrow on the potentiometer pointing to the dot beside it as shown).
GAIN EQ1GAIN EQ2GAIN EQ3GAIN EQ
4
Figure 1. MDA 2V EQ and MDA 4V EQ Default Potentiometer Adjustment
1/2
GAINGAIN EQGAIN
C
GAIN EQ
Y
1/2
CY
Figure 2. MDA 4SV EQ Default Potentiometer Adjustment
о If using long cables, follow these steps to adjust the potentiomenters:
a. Send the Color Bars test signal
to the input, using a video test
generator such as the Extron
VTG 300.
b. Adjust the Gain potentiometers
for output 1 until the signal
level at the far end is the same
as the input (or the display
shows the desired brightness
and contrast).
c. Adjust the EQ potentiometer
for output 1 so that no
overshoot or round front
corners appear at the far end
on an oscilloscope (or you
see a sharp picture with no
smearing).
d. Repeat steps b and c for the
rest of the outputs.
MDA EQ Series Setup Guide, cont’d
© 2010 Extron Electronics. All rights reserved.
68-978-50 Rev A
03 10
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Figure 3. Application Example — MDA 4V EQ
MDA 4V EQ
POWER
12V
0.2A MAX
INPUTINPUT
LOOP-THRULOOP-THRU
OUTPUTSOUTPUTS
IN
1
2
75 Ohm
3
4
Projectors
Local Monitor
Flat Panel
Display
LCD
Projector
Extron
MDA 4V EQ
Distribution
Amplifier
DVD Player
200'
Cable
1,000'
Cable
50' Cab le
800'
Cable
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