Extron electronic RGB 404, RGB 402, RGB 406, RGB 408 Electrical tape or heat shrink, and secured

Installation and Operation, cont’d

If shielded twisted-pairwires are used for audio output for the RGB 404, RGB 406 or RGB 408, the shields should be connected to either pin 3 (RGB 406/408) or pins 3 and 8 (RGB 404) of the audio output captive screw connector. Twist the wires from the braided shield together to form a

signal. For example, the input signals from the left side of channel one (CH1L) are output as CH1L+ and CH1L-. The following illustration shows the audio inputs and outputs and how to wire the audio connectors.

multi-strand wire, then insert it into the receptacle side of the captive screw connector. See the “Wiring audio output captive screw connectors” illustration on the next page.

Twisted-pair shields are not used for most other RGB 400 Series applications, even when twisted-pair wires are used. For those other applications, twist the shields together, and fold them back under the wall box cable clamp or attach them to the grounded wall box with a screw.

To prevent short circuits, unused shielded twisted-pair wires and exposed cable shields (braided or foil) must be insulated with

	L
Channel 1	GND
	R
Channel 2	L
	GND

R

Female

Captive Screw

Connector

L	Channel 1
GND	from Audio L, R
	RCA
R	Connectors
L	Channel 2
GND	from PC
	3.5mm
R	Connector
Male	Circuit Board
Base

electrical tape or heat shrink, and secured.

Connect coaxial cables’ shields to a ground through the individual connectors (BNC, S-video or RCA).

Connecting audio cables — RGB 404

The RGB 404 creates two 2-channel, balanced audio outputs from two unbalanced inputs.

•Audio channel one (CH1) consists of unbalanced input on two RCA input connectors (one each for left and

	right input), and balanced output
	on pins 1 – 5 of the 10-pole audio
Tip Sleeve ( )	captive screw connector on the rear
	of the circuit board. Wire the RCA

input plugs as shown at left.

•Audio channel two (CH2) consists of unbalanced left and right input from the single PC-type 3.5 mm audio plug, and balanced output on pins 6 – 10 of the 10- pole captive screw connector on the rear of the circuit board. Wire the stereo PC input plug as shown here:

Tip (+) Sleeve (GND)

Ring (R, -)

Tip (L, +)

Sleeve (GND)

The audio signals are converted from unbalanced to balanced signals as they pass through the RGB 404. As a result, two output signals are produced for each input

Wiring RGB 404 audio connectors

To wire the audio output captive screw connector, follow these steps:

1.Prepare the wires for insertion into the connector by trimming off 3/16 inch of insulation.

2.Following the wiring diagram found on the label on the back of the faceplate or in this manual, insert the wires one at a time into the connector.

3.Tighten the wire clamp in the connector by turning the appropriate screw clockwise. Do not overtighten the screw. Avoid touching circuit board components with the ends of the wires. See the illustration below.

Ground/Shield

	Ground/Shield
Base
Circuit Board	Circuit Board
RGB 404	RGB 406 and RGB 408

Wiring audio output captive screw connectors

4.The cable shields should be connected to either pins 3 and 8 (RGB 404) or pin 3 (RGB 406/408) of the audio

2-18 RGB 400 Series Installation and Operation RGB 400 Series Installation and Operation 2-19