Extron electronic Stereo Amplifier MDA3 User Manual

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  
Product specifications are available on the Extron website, www.extron.com.  
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.  
1
 
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  
3
 
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.  
9
Front Panel, all MDA Models  
DISTRIBUTION AMPLIFIER  
Figure 6.  
MDA 3 Series Front Panel (All Models)  
68-607-01  
Rev. E 10 13  
Extron Headquarters  
+800.633.9876 Inside USA/Canada Only  
Extron Europe  
Extron Asia  
Extron Japan  
Extron China  
Extron Middle East  
+971.4.299.1800  
Extron Korea  
Extron India  
+800.3987.6673  
Inside Europe Only  
+65.6383.4400  
+65.6383.4664 FAX  
+81.3.3511.7655  
+81.3.3511.7656 FAX  
+86.21.3760.1568  
+86.21.3760.1566 FAX  
+82.2.3444.1571  
+82.2.3444.1575 FAX  
+1800.3070.3777  
(Inside India Only)  
+971.4.299.1880 FAX  
Extron USA - West  
+1.714.491.1500  
Extron USA - East  
+1.919.850.1000  
+31.33.453.4040  
+91.80.3055.3777  
+1.714.491.1517 FAX  
+1.919.850.1001 FAX  
+31.33.453.4050 FAX  
+91.80.3055.3737 FAX  
© 2013 Extron Electronics All rights reserved. All trademarks mentioned are the property of their respective owners. www.extron.com  
 

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