User guide

Troubleshooting
MultiView™ II DVI-TX Installation and User Guide 16
Chapter 5 Troubleshooting
In most cases, nearly every issue with the MultiView™ II CAT5 Video System can be resolved by checking the
CAT5 termination and making sure that it’s pinned to the TIA/EIA 568B wiring specification. However, there may
be other problems that cause the system to not perform as it’s designed. Below are solutions to the most
common installation errors and their solutions.
Problem Solution
No video signal at
the transmitter
local port or at the
receiver
Check that both units are powered.
Ensure receiver EQ and SKEW adjustments are set correctly. Change EQ settings slowly to
allow the display to re-acquire a valid signal and display the image.
Make sure the CAT5 cable is terminated correctly per the TIA/EIA 568B wiring specification.
Is the display device powered on and functioning?
Check to ensure display settings (resolution, refresh rate, etc) are compatible with input
signal.
In some cases, the video termination may be mismatched. Generally, transmitters and
receivers ship with 75-ohm termination as the default. Refer to applicable user-guides to
change the termination settings.
There may be a DDC/EDID compatibility problem. Try changing the DDC mode setting, or
copying the DDC/EDID profile directly from the display.
Poor video quality
at receiver
Ensure receiver EQ and SKEW adjustments are set correctly. Change EQ settings slowly to
allow the display to re-acquire a valid signal and display the image.
Check all cable connections.
The video signal’s refresh rate may be set too high. Reset to a lower refresh rate in your
display-configuration menu (for example, under Windows on a PC).
There may be a video-skew delay issue. See section on skew adjustments in the applicable
receiver manual.
There may be a DDC/EDID compatibility problem. Try changing the DDC mode setting, or
copying the DDC/EDID profile directly from the display.
Poor audio quality
The audio output at the receiver is line-level only. An amplifier or powered speakers are
required. Make sure amplifier or speaker power is ON.
Check input source levels from the source device. Ensure the audio source level does not
exceed the audio-input ratings for the DVI-TX. Clipping or distortion can result.
Audio is summed left and right for “A” versions. If using a single channel, both audio inputs
must be connected at the transmitter end to obtain proper audio gain through the link (1:1,
input to output).
If daisy chaining, audio termination must be removed in DP receivers (AK600/1200DP and
XR2000DP). Only the last receiver requires termination. This does not apply to SA or SAP
units. SA units no longer require separate daisy chain or end of line units as of April 2009.
Refer to the appropriate receiver user manual.
Serial
communication
doesn’t work
correctly
Are the serial devices connected properly? Are the serial parameters correct for
source/destination devices?
Are the serial cables terminated correctly? Is a null-modem cable required at the TX or RX
end?
When using RS-232 capable receivers with video switches, distribution amps, or multi-output
transmitters, the serial data is sent transmit-only. Please take this into account when trying to
control displays or other devices. For assistance, contact Magenta Technical Support.