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INTERFACES
12
12
FREQUENTLY ASKED QUESTIONS 9
No: Question Answer
1 When and
why do I
need to
use the
horizontal
position
dial?
The horizontal position control
dial enables or disables the
control of the horizontal
position of the image. First
adjust the horizontal position
using the monitor or projector
control, and then use the
horizontal position control of
the VA6822, if needed.
2 What dip-
switch do I
set to
receive
composite
SYNC
output?
The first option is to take the
output from RED, GREEN,
BLUE & CSYNC connectors
regardless of the dip-switch
settings. The second option is
to turn OFF the H&V Output
dip-switch and take the output
from RED, GREEN, BLUE,
and HSYNC connectors.
3 When and
why would
I use the
Sync on
Green dip-
switch,
although
the unit
does not
separate
Sync from
Green?
The VA6822 does not
separate the sync signal from
green, but if the desired output
is in RGsB format when the
input signal is RGBS or
RGBHV, then turn the sync on
green dip switch to the ON
position. The VA6822
combines Sync on Green if
this switch is in the ON
position.
4 When do I
use the
H&V Out
dip-switch?
If the desired output is in
RGBHV format, then turn ON
the H&V Out dip-switch. If the
H&V Out dip-switch is OFF,
then composite sync may be
present on the HSYNC
connector.
TROUBLESHOOTING GUIDE 10
1. The power LED should turn RED when the
correct voltage is applied to the Interface. It
should turn GREEN when both power and a
valid input signal is applied. If the power LED
is absent when the unit is turned ON, return
the VA6822 to the factory for repair.
2. Make sure the cables have the correct pin-out
and the connection and quality of the cables
is good.
3. Make sure that the source and display are
scan-rate compatible. The projector should
support an appropriate signal format (RGsB,
RGBS or RGBHV). Connect the projector
directly to a computer with a shorter cable to
verify the compatibility of display and source.
4. If the desired output is in RGBS format, then
the H&V Output dip-switch is in the OFF
position and the Composite SYNC signal is
taken from the HSYNC or CSYNC connector.
If the display needs an RGBHV signal, then
the H&V Output dip-switch should be in the
ON position and the sync signal is taken from
the HSYNC and VSYNC connectors.
5. If the desired output is RGsB, then the SYNC
ON GREEN dip-switch should be ON.
6. If the image bends on top of the screen and
RGBHV output is used, then turn on the H&V
Output dip-switch.
7. Please make sure that the amplitude level of
the input signal is as follows:
a) RED, GREEN, and BLUE channels are
less than 1.2Volts
b) HSYNC & VSYNC are less than 5.0 volts
8. Please use only an ALTINEX supplied power
cord suitable to the country of usage for
proper operation of the VA6822.
9. If problems show up on the display after
continuous usage at higher voltage, higher
temperature, higher humidity, or at other
extreme environmental conditions, please
correct those extreme conditions.