User guide

e 14

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

Probable Causes Possible Solutions

No image OFF Power off Check power supplies of CATV equipment

No image or

very noisy

ON Wrong pin configuration Check pin configuration and verify straight-

through wiring

Picture snowy ON Exceeded distance/bandwidth

specifications

Lower grade UTP cable is

introducing high losses

Insufficient signal strength at input

Check if distance spec is exceeded

Reduce cable length.

Replace cable by higher grade

Check level

Horizontal

upward moving

bands

ON Ground loop problem. Isolate CATV receiver from local ground.

Some channels do

not come in

ON Bandwidth limitation Check that the channel frequency is within the

bandwidth limitation of the baluns and hubs

Internet not

functioning

ON Unsupport by CATV system Ensure that all RF components support bi-

directional transmission

Over bright image ON Signal strength too high Attenuate signal by reducing amplifier gain or

by moving internal jumper.

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

CATV receiver, cable modem, cable

length and type.

• Description of problem.

• List of tests performed.