Muxlab VGA Wall Balun II, US - Manual (Page 2)

© MuxLab Inc. 2010
or VGA distribution amplifier. Tighten the mounting screws on each balun.
2. Connect a Cat 5E/6 4-pair cable from the modular RJ45
jack of the 500043 or 500043 to the twisted pair cabling
of the building. Wiring must be straight-through and
according to EIA 568A or 568B as shown in the
following diagram.
1. To install the balun in a single back box, choose a back box
with a depth of 40 mm or more. Connect the RJ45 plug into the
rear of the balun. Secure the balun with the 2 front screws.
2. Place a Decora® faceplate (not included) and secure with the
2 front screws.
3. Connect the 500041-WP-US to the VGA input of the display
using a standard VGA cable.
4. Power on the PC and VGA monitor. Set monitor Contrast and Brightness to the desired
levels. Set the monitor refresh rate to 60 Hz. See typical application below.
5. Due to the fact that some displays are more sensitive than others and may not sync up
correctly, a RESET button is provided on each VGA Wall Balun or VGA Balun II to
allow these displays to re-synchronize. A RESET button is on both the transmit and
receive side baluns for greater convenience and ease of access. If the initial setup yields
an improperly positioned image on the screen, using a pen or small screw driver, press
the RESET button located next to RJ45 jack on one of the baluns and then immediately
press the AUTOSET button located on the display unit. During this time the image will
change hue and gradually return to normal after approximately fifteen (15) seconds.
Note: Some displays do not require the AUTOSET button to be pressed.
6. Set monitor Contrast and Brightness to the desired levels.
Note: In order to avoid accidentally resetting the connection, the Screensaver options
under Windows Display Settings must be set as follows: (a) Choose any screensaver
except “NONE”; and (b) The “Turn Off Monitor” setting must be set to “NEVER”.
7. The VGA Balun features an optional grounding screw (see diagram above) that may be
used to clear up any image anomalies. For example, under some conditions, there may
be a slight difference in hue between the left hand side of screen and the right.
Connecting the ground terminal to earth ground will help clear this up. However, if
there is a ground loop problem in the building, connecting the ground terminal may
negatively affect the image. Therefore the ground screw should only be used if it
improves the overall image quality.
Note: During start-up, there may be a two (2) to three (3) second delay before an image
appears and the initial image may have a yellow hue. This is a normal function of the
product and is required in order to allow the monitor to sync up correctly.
Front view Side view Rear view
Troubleshooting
The following table describes some of the symptoms, probable causes and possible
solutions in respect to the installation of the VGA Balun II:
Symptom Probable Causes Possible Solutions
No continuity in video link Verify cable continuity between baluns.
Power off Check power supplies of VGA equipment.
No video
PC settings
Perform diagnostics on your VGA equipment
by following the manufacturer’s instructions.
Image distorted or skewed.
Specific display unable to sync
up Follow RESET procedure in manual to force
display to sync up correctly.
Image not stable Defective link or equipment Verify VGA equipment interface integrity.
Unusual colors Reversed polarity Ensure wiring is straight-through polarity.
Background pattern EMI interference
Identify possible radiating frequency sources
Try to isolate them from the video. Use
shielded twisted pair grounded at both ends.
Smearing Exceeded distance Verify cable grade. Use higher grade cable.
Exceeded distance
Verify cable grade. Use higher grade cable if
necessary. Adjust contrast on monitor.
Weak contrast
Unusual link attenuation Verify cable distance using cable tester.
Horizontal bars moving upward
in background
Ground loop problem
Assure that PC and Monitor are connected to
the same ground. Disconnect PC or monitor
from the ground.
1 to 2 pixel object random
dislocation High noise level in the room.
Distance exceeded. Set another resolution and refresh rate.
Review connectivity.
Slight variance in hue between
left and right display margins
Slight background noise Connect ground terminal to earth ground.
Shaking image Possible ground loop problem Disconnect gnd terminal from earth ground.
If you still cannot diagnose the problem, please call MuxLab Customer Technical
Support at 877-689-5228 (toll-free in North America) or (+1) 514-905-0588
(International).