Troubleshooting – Muxlab LongReach 16 Active CCTV Hub User Manual
Page 13
© MuxLab Inc.
LongReach 16 Active CCTV Receiver Hub Installation Guide
Page 13
4.
Troubleshooting
The following table describes some of the problem symptoms, the probable causes and
possible solutions. If the information below does not solve the problem, the technical
support contact information can be found at the end of this section.
Picture
Power
LED
Port
LED
Probable Causes
Possible Solutions
No image
OFF
Power off
Blown fuse
Check power supplies of CCTV
equipment
Remove the fuse at the rear of the
unit and replace it with one with the
same rating
No image
ON
ON
Wrong pin configuration
Check pin configuration and verify
straight-thru wiring
Picture distorted
ON
ON or
blinking
EMI interference
Wires reversed on signal pair
on one side
Split pair
Check that wiring is not too close to
transformers and lighting ballasts
Make sure that the wires on the
signal pair are not reversed on one
side.
Check if the UTP pairs are correct
(not split)
Picture loses
color
ON
ON
Exceeded distance
specifications
Lower grade UTP cable is
introducing high losses
Check DC loop resistance and
verify if distance spec is exceeded
Reduce cable length or eliminate
high-loss components
Replace cable by higher grade
Picture contains
low frequency
background
noise (wood
grain pattern)
ON
ON
Poor grounding
Connect ground of Active Balun to
true building ground
Image
occasionally
fading,
synchronization
not perfect
ON
ON
Ground Loop Fault. i.e.
ground differential voltage
between transmit and receive
ends exceeds 2 V DC or AC.
Isolate remote camera power entry
and enclosure from local ground.
Ensure that camera is secured
against static discharges (i.e.; is
inside metal, grounded cage)
When contacting your nearest MuxLab dealer or MuxLab Technical Support please have
the following information ready:
• Unit model number.
• Cabling lay-out. Include model of
camera and DVR used, cable length
and type.
• Description of problem.
• List of tests performed.