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Pre-emphasis
Pre-emphasis compensates for long cable runs, distortion, and pixilation on the distribution amplifier outputs. To enable
pre-emphasis:
1.
Remove and keep the screws holding the cover to the base. For the DVI DA4 Plus, there are three screws along the rear edge
of the top and two screws on each side. For the DVI DA6 Plus and DVI DA8 Plus, there are four screws along the rear edge of
the top and three screws along each side. Set aside the cover.
2.
Check the part number of the printed circuit board (see
20-1667-01LF and higher for the DVI DA4 Plus or 20-1683-02LF and higher for the DVI DA6 Plus or DVI DA8 Plus.
NOTE:
If the part number of the board is lower than these values, you cannot activate pre-emphasis on your model.
Replace the cover as described in step 5.
3.
Locate the Pre-emphasis DIP switch (number 1), which is labeled Preemph.
4.
By default, the Pre-emphasis DIP switch is in the down (disabled) position. To enable pre-emphasis, toggle the switch to the
up position.
5.
Replace the cover, using the screws that were removed in step 1.
Troubleshooting
No output signal — Check that the front panel LED is lit (amber shows that the unit is receiving power, green shows that
•
it is also receiving an input signal). If LED is not lit, check the
page 3).
•
No output signal or poor quality signal — Check the integrity of the cabling from the source device to the distribution
amplifier and from the distribution amplifier to each of the display devices.
•
DVI signals run at very high frequency and poor connections can cause degradation or loss of the signal, or jitter.
•
Signal transmission distance can vary greatly and depends on signal resolution, cable type, cable quality, graphics card
and the display used in the system.
•
Use only cable that is designed for DVI signals.
•
Limit or avoid the use of adapters or couplers.
•
Enable the Pre-emphasis feature
•
Display device displays a flashing black or blue screen, snow or other distortion — A device that is not HDCP compliant
may be receiving HDCP-encrypted signals. The DVI DA Plus series distribution amplifiers are not HDCP compliant.
•
Signal on some displays but not others — Reboot the source device. When the source device boots up, the EDID handling
feature ensures that the output resolution of the source device matches the requirements of the display device with the
lowest resActuallyolution.
•
If an additional display device is added, which requires an even lower resolution, the image does not display correctly on that
monitor until the source device is shut down and rebooted. At that time, EDID handling ensures that the output resolution of
the source device is recalibrated to meet the needs of the additional display device.
NOTE:
For EDID handling to work correctly, you must disable the EDID Lock feature for all outputs (see
page 6).
figure 5
on page 5). The boards must have a part number of
Power input
(see page 3) and the
Input connector
(see
EDID Lock
DVI DA Plus Series • User Guide
on
7
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