Extron Electronics RGB 168xi VGA User Guide - Manual (Page 11)

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
J-20: Sync polarity jumper — This jumper adjusts the
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 placed on pins 1 and 2,
output H and V sync polarities will be
forced to negative.
• If the jumper is placed on pins 2 and 3, output
sync polarities follow input sync polarity:
the output sync signals’ polarity will be the
same as the input polarity.
This is the default setting.
J-40: Vertical sync width jumper — This jumper
adjusts the vertical sync pulse width. Some
digital display devices have very specific
requirements for incoming sync pulse width.
If no picture displays, 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 placed on pins 1 and 2, the
output vertical sync pulse will be
short (narrow).
• If the jumper is placed on pins 2 and 3, the
output vertical sync pulse will be wide.
This is the default setting.
5. Replace and fasten the enclosure cover, reversing step 2.
If adapter plates will be installed next, this step can
be omitted.
Negative Follow
1
Wide
Short
1
Installing Adapter Plates
The RGB 138xi and RGB 168xi offer the ability to incorporate
a variety of optional architectural adapter plates for pass-
through audio and/or video connections. Each interface’s
front panel can hold up to four (4) input adapter plates. The
rear panel can hold up to two (2) output adapter plates.
Blank plates (three double height) are included with the
interface to cover unused spaces. Other adapter plates
must be ordered separately.
The input plates attach to the front panel. Output cables,
attached to the rear of each plate, pass through the interface
enclosure and rear panel and are held in place by clamps or,
where an output plate is installed, may be wired directly to
the rear output plate connectors. Some adapters require
cables to be soldered to the input/output plate connectors.
3. Note the positions of jumpers J20 and J40 before
changing jumper settings. The illustration of the
circuit board (below) shows the locations of the J20
and J40 jumpers. There are two possible setting
combinations for 3-pin jumpers:
pins 1 and 2 connected, and
pins 2 and 3 connected.
Circuit board jumper locations
4. Configure the jumpers. To configure the jumpers, use
pliers to pull the jumper shunt off the pins, then
place the jumper on the appropriate pins.
Changing jumper settings
The jumpers perform the following functions:
1 and 2
2 and 3
J19
1
J40
1
J20
1
Front
Rear
Power Supply
J20: Sync polarity
jumper
J40: Vertical sync
width jumper
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