MDA 3 Series • User Guide
This guide describes the installation and operation of the Extron MDA 3 Series Mini Distribution Amplifiers (MDA).
FCC Class A Notice
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the
FCC rules. The Class A limits provide reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used
in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment
in a residential area is likely to cause interference. This interference must be corrected at the expense of the user.
NOTE: For more information on safety guidelines, regulatory compliances, EMI/EMF compatibility, accessibility, and related topics,
see the “Extron Safety and Regulatory Compliance Guide” on the Extron website.
Specifications Availability
Introduction
The Extron MDA 3 Series are a family of eight one-input, three-output, video and audio distribution amplifiers. The MDA series
distribution amplifiers (DAs) split one composite video or S-video input and/or audio input for output to multiple destinations with
no loss of signal quality. The MDA are members of the Extron line of basic distribution amplifiers, switchers, and associated video
accessories.
The MDAs distribute composite video, S-video (luminance (Y) and chrominance (C)), and/or balanced or unbalanced audio on
captive screw connectors, or unbalanced audio on RCA connectors, in the following combinations:
Audio (Captive
Audio (RCA
Distribution Amplifier
MDA 3SV
S-Video
Composite Video Screw Connectors) Connectors)
MDA 3SVA
MDA 3SV Dual
MDA 3V
2
MDA 3AV
MDA 3V Dual
MDA 3A
2
MDA 3A RCA
The MDAs ship with external desktop 12 V power supplies that accept 100 to 240 VAC, 50 Hz or 60 Hz input.
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NOTES:
•
The length of exposed wires is critical. The ideal length is 3/16 inch (5 mm).
•
•
If the stripped section of wire is longer than 3/16 inch, the exposed wires may touch, causing a short circuit.
If the stripped section of wire is shorter than 3/16 inch, wires can be easily pulled out even if tightly fastened by
the captive screws.
•
•
Do not tin the power supply leads before installing them in the connector. Tinned wires are not as secure in the
connector and could be pulled out.
When making connections for the MDA from existing audio cables, see figure 3. A mono audio connector consists
of the tip and sleeve. A stereo audio connector consists of the tip, ring and sleeve. The ring, tip, and sleeve wires
are also shown on the captive screw audio connector diagrams, figure 2 and figure 4.
Tip
Sleeve
Tip (Left)
Sleeve (Gnd)
Ring (Right)
Tip (Left)
Tip (Signal)
Sleeve (Gnd)
Sleeve (Gnd)
Unbalanced Stereo
Unbalanced Mono
Figure 3. Phono Audio Connectors
f Audio Outputs (1 through 3) connectors — Connect up to three balanced or unbalanced audio devices to these 3.5 mm,
five-pole captive screw connectors. Connect audio devices, such as an audio amplifier or powered speakers. See figure 4 to
properly wire an output connector.
No Ground Here
Tip
Ring
Sleeves
Tip
Ring
inch
Tip
Sleeves
Tip
Do not tin the wires!
No Ground Here
Unbalanced Stereo Output
Balanced Stereo Output
Figure 4.
Captive Screw Connector Wiring for Audio Output
ATTENTION: For unbalanced audio, connect the sleeves to the ground contact. DO NOT connect the sleeves to the
negative (-) contacts.
NOTE: The length of exposed wires is important. The ideal length is 3/16 inch (5 mm) (see the NOTES above for details).
g Bal(anced)/Unbal(anced) DIP switches — For each balanced audio output, set the associated DIP switch to the Balanced
(up) position. For each unbalanced audio output, set the associated DIP switch to the Unbalanced (down) position.
The balanced or unbalanced nature of the audio output is determined by the output connector wiring, not the audio input.
Each output can be balanced or unbalanced independently of the other two outputs.
MDA 3 Series • User Guide
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Power (All Models)
ATTENTION: Power supply voltage polarity is extremely important. Applying power with incorrect voltage polarity
could damage the power supply and the MDA. Identify the power cord negative lead by the ridges on the side of the
cord.
h Power connector — Plug the external 12 VDC power supply into this two-pole captive screw connector. The power supply
is included with the unit. Figure 5 shows how to wire the connector.
Smooth
Ridges
A
A
SECTION A–A
Power Supply
Output Cord
Tie Wrap
0.3 inch (7 mm) MAX
Orange Captive Screw
Connector
Figure 5.
Power Connector Wiring
ATTENTION:
• Always use a power supply supplied by or specified by Extron for use with the MDA. Use of an
unauthorized power supply voids all regulatory compliance certification and may cause damage to the
supply and the MDA.
• Unless otherwise stated, the AC/DC adapters are not suitable for use in air handling spaces or in wall
cavities. The power supply is to be located within the same vicinity as the Extron AV processing equipment
in an ordinary location, Pollution Degree 2, secured to the equipment rack within the dedicated closet,
podium or desk.
• The installation must always be in accordance with applicable provisions of National Electrical Code ANSI/
NFPA 70, article 75 and the Canadian Electrical Code part 1, section 16. The power supply shall not be
permanently fixed to building structure or similar structure.
• The length of exposed wires is important. The ideal length is 3/16 inch (5 mm) (see the NOTES on page 3
for details).
• To verify the polarity before connection, plug in the power supply with no load and check the output with a
voltmeter.
• The two power cord wires must be kept separate while the power supply is plugged in. Remove power
before wiring.
As an alternative, an Extron P/S 100 Universal 12 VDC Power Supply can power multiple MDAs or other Extron 12 VDC
devices using only one AC power connector.
i Power LED — When lit, this LED indicates power is applied to the MDA.
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Front Panel, all MDA Models
DISTRIBUTION AMPLIFIER
Figure 6.
MDA 3 Series Front Panel (All Models)
68-607-01
Rev. E 10 13
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