Setting Internal Jumpers - Extron electronics RGB 103 User Manual

Controls and Installation, cont'd
If desired, change the configuration of jumper J20
3
(sync polarity) or J40 (vertical sync width). See
"Setting internal jumpers" below.
Set up the configuration switches. See "Setting
4
configuration switches" on page 2-9.
If desired, attach the interface to a table or under a
5
podium using an optional Extron mounting kit. See
"Mounting the interface" on page 2-9.
Attach the interface to the computer, attach the local
6
monitor to the interface, and attach the projector to
the interface. See "Cabling" on page 2-11.
If you are not using a local monitor with the
RGB 103xi or the RGB 112xi, you must attach an
MFTA (multi-frequency termination adapter) to
simulate a monitor.
Attach the interface to an audio system. See
7
"Connecting audio" on page 2-12.
Plug the interface into a grounded AC power source.
8
Turn on the computer, monitor, and projector (or
9
other display device).
The image from the computer should appear on the
10
projector and monitor. If it does not, double check
steps 4 through 6 and make adjustments as needed.

Setting internal jumpers

The jumpers inside the interface are set at the factory for
optimal use by 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:
J20: Sync polarity jumper — This jumper adjusts the
Follow Negative
1
• If the jumper is on pins 1 and 2, output H and
V sync polarities are forced to negative.
LM RGB 103/109/112xi xi xi xi xi Controls and Installation
2-6
output sync polarity. Horizontal
(H) and vertical (V) sync output
can either follow input sync
polarity, or be forced to negative.
• If the jumper is on pins 2 and 3, output sync
polarities follow input sync polarity: The
output sync signals' polarity is the same as
the input polarity. This is the default
setting.
J40: Vertical sync width jumper — This jumper
adjusts the vertical sync pulse width.
Some digital display devices have very
Wide
Short
specific requirements for incoming
1
sync pulse width. If no picture
appears, the picture cuts in and out, or the
picture is scrambled, try adjusting the vertical
sync pulse width or switching from ADSP to
DDSP.
• If the jumper is on pins 1 and 2, the output
vertical sync pulse will be short (narrow).
• If the jumper is on pins 2 and 3, the output
vertical sync pulse will be wide. This is
the default setting.
To change the jumper settings, do the following:
1. If the power cord is attached, remove power from the
interface by disconnecting the AC power cord from
the unit.
2. Remove the interface cover (the top half of the
enclosure), as shown in figure 6. Remove the screws
from the enclosure, slide the cover slightly towards
the back of the enclosure, enough to clear the gain/
peak switch, lift the cover, and place the cover
upside down next to the base of the enclosure.
Do not pull on the cable that attaches the cover
to the base. Doing so could disconnect the
cable from its connectors.
Do not touch any switches or electronic
components inside the interface. Doing so
could damage the interface.
Slide cover back slightly,
lift straight up.
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Figure 6 — Opening the interface cover
RGB 103/109/112xi xi xi xi xi Controls and Installation
Remove 5
screws
RM
2-7