Magenta Research MultiView AK500 Quick Reference & Setup Manual - page 7
MAGENTA MULTIVIEW™ SERIES
22
3.4 Video Adjustment
3.4.1 Cable Distance Compensation Settings
Before performing the adjustment procedure below, be certain that the MultiView
AK500 Receiver is connected to the CAT5 cable that will be used in your particular
installation. This is because the adjustments are specific to the type and length of UTP
cable being used.
In order to get the highest quality video signals from your MultiView AK500DP, please
follow the instructions and diagrams below:
An image file is available for download at www.magenta-research.com/MV1500test.
bmp to assist in these settings. If the image file cannot be downloaded, use a utility to
draw a black box on a white background.
Before you begin, ensure the EQ Adjust knob is fully counter clockwise and all skew
compensation switches are in the off position.
Turn the EQ Adjust knob clockwise until the shadow next to the black box just
disappears. The brightness in the white area should be the same as the white area
above and below the black box.
3.4.2 Skew Compensation Settings
Skew compensation may be necessary for signal timing differences due to differing pair
lengths within the CAT5 cable. An alternative to using skew compensation is to utilize
Skew Free CAT5 cable. Contact Magenta Research for details.
Using the skew compensation switches, 10 nanoseconds of skew may be compensated
for each color pair.
An image file is available for download at www.magenta-research.com/
MV1500test.bmp to assist in these settings. See Figure 3-2 for an example.
Using the switches, adjust each color to align the Red, Green, Blue lines so that they
are stacked on top each other as a single line.
10
7
CHAPTER 4: Troubleshooting
4. Troubleshooting
4.1. Common Problems
In most cases, nearly every issue with the MultiView™ 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.
Problem: No video signal at the transmitter local port or at the receiver.
Solution: • Check that both units are powered.
• Ensure EQ adjustment is set correctly — turn knob slowly. The
knob is equivalent to 0 feet of cable when fully counter-clockwise
and equivalent to 500 feet of cable when fully clockwise.
• 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. The
transmitters and receivers ship with 75-ohm termination as the
default. To disable termination, see Appendix B.
Problem: Poor video quality:
Solution: • Have all receiver adjustments been finished (see section 3.4).
• Ensure EQ adjustment is set correctly — turn knob slowly. The
knob is equivalent to 0 feet of cable when fully counter-clockwise
and equivalent to 500 feet of cable when fully clockwise.
• Check all cable connections.
• The video signal’s refresh rate may be set too high. Reset to a
lower refresh rate in your monitor-configuration menu.
• There may be a delay skew issue. See Section on Skew.
Problem: Poor audio quality:
Solution: • Powered speakers are required. Make sure speaker power is
ON.
• Check input source levels from the source device. Make sure
the audio source is not overdriven or underdriven.
• Audio is summed left and right for “A” versions. If using a single
channel, both audio inputs must be connected at the transmitter
end for full audio gain. Audio is line level.
• SA serial//audio units support full stereo line level. A high
frequency noise may be heard if the cat5 cable from the
transmitter is disconnected, or the transmitter is not power up.
This is normal. And will disappear once a complete link
connection is made.
• If Daisy Chaining, audio termination must be removed in DP
units. Only the last receiver requires termination. For SA units a
special un-terminated version must be used between
transmitters and the last receiver with a standard End-Of-Line
unit installed at the end. SA units cannot be terminated/
unterminated in the field. This does not apply to SAP units.
11