- Extron Electronics Universal Interfaces User's Manual

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xi Controls and Installation
The jumpers perform the following functions:
J20: 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 polarity will follow input sync polarity:
the output sync signal’s polarity will be 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 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 wide.
• If the jumper is placed on pins 2 and 3, the
output vertical sync pulse will be short
(narrow). This is the default setting.
5. Replace and fasten the enclosure cover, reversing
step 2.
2-18
Negative Follow
Wide Short