RGB 324/326/340 • Installation and Operation
RGB 324/326/340 • Installation and Operation
Installation and Operation, cont’d
2-10
2-11
Metal Wall Box
Screw
Braided Shield
Installation Cable
Foil Shield
Cable Clamp
To prevent short circuits, the outer foil sheild can be
cut back to the point where the cable exits the cable
clamp. Trim back or use heat shrink to insulate all
shields (braided or foil) from the circuit board. If
shields contact the circuit board, a short circuit may
occur. Also, both the braided and foil sheilds should
be connected to an equipment ground at the other
end of the cable.
Connecting the buffer to the RGB 320
with installation cable
The cabling examples on page 2-14 and 2-15 show a buffer
wired for RGBHV video and balanced audio output using
seventeen conductor plenum installation cable.
Extron recommends using Extron’s seventeen conductor bulk
plenum installation cable (part numbers 22-111-03, 22-111-04) or
equivalent. Installation cable includes coaxial cables for video
signals, shielded twisted pair wires for audio, and single
conductors for power and communications signals.
Connect the cables between the buffer and the
RGB 320 interface on a one-to-one basis. Cable
conductor assignments must be the same at both
ends of the cable
, or damage may occur to circuits
in the buffer and/or the RGB 320.
Remove power from both the buffer and the
RGB 320 while cables are being attached.
Preparing and terminating the cable
Use the illustrations on pages 2-14 and 2-15 as wiring guides.
They show connectors and conductor assignments for the buffers
and the RGB 320.
1.
Select and install a multiconductor cable, such as the
Extron Plenum seventeen conductor installation cable, which
contains appropriate conductors (at least 5 coaxial, 3 sets
of shielded twisted pair, 3 single 20 AWG) for the video,
power, control, and audio signals that this system will use.
4.
Remove the Adjust knob. You may need a very small
diameter Allen wrench to loosen the nut that holds it in
place.
5.
Slide the top part of the enclosure slightly forward, then
upward to remove the cover. The circuit board remains in
the bottom portion of the enclosure.
H-SHIFT
HIGH-Z
INPUTS
ANALOG
AUDIO
SHOW ME/
SELECT
V-SHIFT
VIDEO LEVEL
AUDIO LEVEL ADJUST
Remove (5)
Screws
Remove (2)
Connector Nuts
and Knob
Opening the RGB 340 enclosure
6.
Set the level/peaking jumpers. See the jumper diagram on
page 2-9.
7.
Reverse steps 2 through 5 to replace the cover.
Cabling
All the output, power, and control cables from the RGB 324,
RGB 326, and RGB 340 buffers go directly to the RGB 320
switching interface. Refer to the RGB 320 User’s Manual and see
“Connecting the buffer to the RGB 320 with installation cable”
in this chapter when making and connecting cables for the
buffers. Run the cables through the wall/furniture and into the
electrical box (if used) before attaching connectors.
Input connections
Input connections and audio input connector wiring are
discussed on page 2-5.
Connecting shields
Multiconductor cables contain several braided and foil shields.
At the buffer end of the cable, the outer braided and foil shields
should be connected to the grounded metal wall box (or to a
grounding wire if a metal wall box is not used). The wires that
make up the braided shield can be unbraided, then twisted
together to form a large, multi-strand wire that can be folded
back under the wall box cable clamp or attached to the metal
wall box with a screw. See the following illustration.
im Vertrieb von
CAMBOARD Electronics
www.camboard.de
Tel. 07131 911201
Fax 07131 911203
