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INTERFACES
10
FAQ (FREQUENTLY ASKED QUESTIONS) 9
No: Question Answer
1. When and
why do I
need to use
the
Horizontal
Position
Adjustment
knob?
If you have multiple
computers connected to a
single display through the
VA6831FC
, this control will
be useful to adjust the
horizontal position of the
image for each input. This
control knob is only active
when CH1 Horizontal Delay
& CH2 Horizontal Delay dip-
switches are in the OFF
position for each input.
2. When and
why would I
use the
SYNC ON
GREEN dip-
switch,
although the
unit does not
separate
SYNC from
GREEN?
The
VA6831FC
does not
separate the SYNC signal
from GREEN. It will
combine Sync with Green
Video, when the SYNC ON
GREEN switch is in the ON
position. So, if the desired
output is in RGsB format,
then put this dip-switch in
the ON position.
3. What is
Horizontal
Delay and
why is this
function
needed?
This function may be
necessary when interfacing
with a projector/monitor with
sensitive sync input, or
particularly with LCD
projectors. When the
Horizontal Delay is in the
ON position, the output will
have the same type of Sync
as the source.
4. Why do we
have
balanced
input and
unbalanced
output?
If you use the
VA6831FC
for a distance of less than
500 ft with an output cable,
there is no need to have
balanced input and
balanced output. If
balanced audio input is fed
into the
VA6831FC
Interface, the unbalanced
audio output will provide a
good signal quality.
TROUBLESHOOTING GUIDE 10
1. The power LED should be ON, when the
correct voltage is applied to the Interface.
2. Make sure that the cables have the correct pin-
outs and the connection and quality of the
cables are good.
3. Make sure that the source and display are
scan-rate compatible. The projector or monitor
should support an appropriate signal format
(RGsB, RGBS or RGBHV). Connect a projector
or monitor directly to the computer with a
shorter cable to verify the compatibility of the
display and source.
4. When adjusting the Horizontal position of the
image, check to see if the CH1 Horizontal
Delay or the CH2 Horizontal Delay switch is in
the OFF position.
5. Verify that the position of the INPUT
SELECTION SWITCH is in the proper position.
6. Please check the status of the LED next to the
Input Selection switch on the front panel and
make sure that it is ON for the active input.