Extron electronics MDA 3A Manual de usuario

MDA 3A • User Guide

This guide describes the installation and operation of the Extron MDA 3A Mini Distribution Amplier (MDA).

Introduction

The Extron MDA 3A is a one-input, three-output audio distribution amplier. The MDA 3A distributes balanced or unbalanced

audio on captive screw connectors. The MDA 3A ships with an external desktop 12 V power supply that accepts 100 to 240 VAC,

50 Hz or 60 Hz input.

Connections, Controls, and Indicator

Figure 1 shows all of the connectors on the MDA 3A.

BAL

123

MDA 3A

POWER

12V

.3A MAX

INPUT

OUTPUTS

L1R2LR LR3

UNBAL

123

Distribution Ampliﬁer

MDA 3A

Front

Rear

BAL

123

MDA 3A

POWER

12V

.3A MAX

INPUT

OUTPUTS

L1R2LR LR3

UNBAL

123

Distribution Ampliﬁer

MDA 3A

111222444333

Front

Rear

1Power Connector

3Audio Outputs Connectors 5 Power LED

2Audio Input Connector 4Balanced/Unbalanced DIP Switches

Figure 1. MDA 3A Rear and Front Panels

Power

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.

• La polarité de la source d’alimentation est primordiale. Une alimentation avec une polarité de tension incorrecte peut

endommager la source d’alimentation ainsi que MDA. Il est essentiel d’identifier une connexion négative du cordon

d’alimentation au niveau des stries sur les parties latérales du cordon.

1Power connector (see figure1) — Plug the external 12 VDC power supply into this two-pole captive screw connector. The

power supply is included with the unit. Figure 2 shows how to wire the connector.

Power Supply

Output Cord

Orange Captive Screw

Connector

0.3 inch (7 mm) MA

SECTION A–A

Ridges

Smooth

Tie Wrap

ATTENTION:

• If not provided with a power supply, this product is

intended to be supplied by a UL Listed power source

marked “Class 2” or “LPS”, rated output 5Vdc min.

0.5A.

• Si ce produit n’est pas fourni avec une source

d’alimentation, il doit être alimenté par une source

d’alimentation certifiée UL de classe 2 ou LPS, avec

une tension nominale 5 Vcc, 0,5 A minimum.

Figure 2. Power Connector Wiring

MDA 3A • User Guide (Continued)

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.

• Utilisez toujours une source d’alimentation fournie ou spécifiée par Extron. L’utilisation d’une source d’alimentation

non autorisée annule toute certification de conformité réglementaire et peut endommager la source d’alimentation

ainsi que le produit final.

• 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.

• Sauf mention contraire, les adaptateurs CA/CC ne conviennent pas à une utilisation dans les espaces d’aération

ou dans les cavités murales. La source d’alimentation doit être placée à proximité de l’équipement Extron dans un

emplacement ordinaire soumis à un degré de pollution de catégorie II, solidement fixé au rack d’équipement d’une

baie technique, d’un pupitre, ou d’un bureau.

• 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.

• L’installation doit toujours être conforme aux dispositions applicables du Code américain de l’électricité (National

Electrical Code) ANSI/NFPA 70, article 75, et du Code canadien de l’électricité, partie 1, section 16. La source

d’alimentation ne devra pas être fixée de façon permanente à la structure de bâtiment ou à d’autres structures

similaires.

• The length of exposed wires is important. The ideal length is 3/16 inch (5 mm) (see the NOTES on page 2 for

details).

• La longueur des câbles exposés est importante. La longueur idéale est de 5mm (3/16inches). (voir les

REMARQUES à la page12 pour plus d’informations).

• To verify the polarity before connection, plug in the power supply with no load and check the output with a

voltmeter.

• Pour vérifier la polarité avant la connexion, brancher l’alimentation hors charge et mesurer sa sortie avec un

voltmètre.

• The two power cord wires must be kept separate while the power supply is plugged in. Remove power before

wiring.

• Les deux cordons d’alimentation doivent être maintenus à l’écart tant que la source d’alimentation est branchée.

Coupez l’alimentation avant de faire les raccordements.

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.

Audio on Captive Screw Connectors

2Audio Input connector (see figure1 on the previous page) — Connect a balanced or unbalanced audio input to this 3.5

mm, five-pole captive screw connector. Connectors are included, but you must supply the audio cable. See figure3 to wire a

connector for the appropriate input type and impedance level. High impedance is generally over 800 ohms.

Unbalanced Stereo Input Balanced Stereo Input

Do not tin the wires!

Tip

Ring

Tip

Ring

Sleeves

Tip

Sleeve

Tip

inch

Figure 3. Captive Screw Input Connector Wiring

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 4. 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 (see figure3 and figure 4).

Tip (Left) Sleeve (Gnd)

Tip (Left)

Ring (Right)

Sleeve (Gnd)

Tip Sleeve

Unbalanced Mono Unbalanced Stereo

Tip (Signal)

Sleeve (Gnd)

Figure 4. Phono Audio Connectors

3Audio Outputs (1 through 3) connectors (see figure1 on page1) —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 5 to properly wire an output connector.

Unbalanced Stereo Output Balanced Stereo Output

Do not tin the wires!

Tip

Ring

Tip

Ring

Sleeves

Tip

No Ground Here

Tip

Sleeves

inch

Figure 5. 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.

ATTENTION : Pour l’audio asymétrique, connectez les manchons au contact au sol. Ne PAS connecter les manchons aux

contacts négatifs (–).

NOTE: The length of exposed wires is important. The ideal length is 3/16 inch (5 mm) (see the NOTES above for details).

4Bal(anced)/Unbal(anced) DIP switches (see figure1) —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.

5Power LED (see figure1) —When lit, this LED indicates power is applied to the MDA.

68-607-50 Rev. B

05 23

For 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.

All trademarks mentioned are the property of their respective owners.

Worldwide Headquarters: Extron USA West, 1025 E. Ball Road, Anaheim, CA 92805, 800.633.9876

Speciﬁcations Availability

Product specications are available on the Extron website, www.extron.com.

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.

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