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Installation and operation, cont’d, Setting internal jumpers – Extron Electronics RGB 168xi VGA User Guide User Manual

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RGB 138xi

xi

xi

xi

xi, RGB 168xi

xi

xi

xi

xi Installation and Operation

RGB 138xi

xi

xi

xi

xi, RGB 168xi

xi

xi

xi

xi Installation and Operation

Installation and Operation, cont’d

7

Stereo audio output connector

— This 3.5 mm,

5-conductor captive screw connector is used for
audio output. See “Cabling” in this chapter for a
wiring guide.

Setting Internal Jumpers

The jumpers inside the interface(s) are set at the factory to meet
the requirements of most systems. However, you can
change a jumper setting to meet the needs of a particular
system.

Changes to internal jumper settings must be
performed by authorized service personnel only.

The user-configurable, internal jumpers control the
following functions:

• horizontal and vertical sync polarity, and
• vertical sync pulse width.

Follow these steps to change the jumper settings. The
RGB 138xi is shown for illustration, but the steps apply to
both models.

1. Remove power from the interface (if it is connected) by

disconnecting the AC power cord from the unit.

2. Open the cover of the interface (the top half of the

enclosure), as shown below. Remove the screws
from the enclosure, and lift the cover straight up.

Do not touch any switches or electronic
components inside the interface. Doing so
could damage the interface.

Opening the interface cover

2-9

properly. Flagging or bending at the top of the
video image is a sign that the serration pulses
should be removed.

ON — When this switch is set to On, serration

pulses will be output in the vertical sync
interval.

OFF — When this switch is set to Off, serration

pulses will not be output.

4 — 75 Ohm (video input termination) —

RGB 138xi

xi

xi

xi

xi only — Video termination is

accomplished in a number of ways when using a
universal interface like the RGB 138xi:

1. Using a laptop breakout cable (LBC)

connected to a laptop or desktop computer
with no local monitor,

2. Connecting a local monitor to the breakout

from an MBC cable,

3. Setting the 75 ohm termination switch on the

interface when using an MBC cable without a
local monitor attached,

4. Using a termination adapter with an MBC

cable and no local monitor attached, or

5. Using an MBC buffer cable.

The input to the interface is high impedance, and
for the video signal to be at a proper level (not
blooming) 75 ohm termination is needed for the
computer signal. The switch provides a method

of termination to prevent blooming
when a monitor breakout cable is used
but no local monitor or termination
adapter is connected.

ON — The RGB 138xi provides 75 ohm video

input termination.

OFF — The RGB 138xi provides Hi Z (high

impedance) video input termination.

4 — SPARE — RGB 168xi

xi

xi

xi

xi only

This DIP switch does not have a
function in the RGB 168xi.

6

BNC output connectors

— These BNC female

connectors are for red, green, and blue video output,
and horizontal, vertical and composite sync output.

SOG

DDSP

SERR

75 Ohm

SOG

DDSP

SERR

SPARE

2-8

RGB 138

xi

RG

B 1

38

xi

INP

UT

S

AU

DIO

AN

AL

OG

UN

SW

ITC

HE

D

600

W

AT

TS

M

AX.

MIN/M

AX

MB

C

PO

WE

R

UN

IVE

RS

AL

IN

TE

RF

AC

E

W

/AD

SP

Remove #8 Screws
(4 Places) Each Side
and Bracket, if Present

Remove (12)
Screws

Lift Cover
Straight Up

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