Trouble Shooting
Any system can
be make or break the entire installation. I have been dealing with the
complaint on modulators but most of the time the problem comes from the other
part of system. And this is why I going to tell you in the following words.
Golden Rule :
Always check the connections before you blame the equipments.
1. Herringbone
in TV
Disconnect modulator
from local channels and check modulated channel. If there is programming move
the modulated channel. If the picture is snowy, use a low pass filter to block
noise or data coming in from cable.
2. Horizontal Bars Rolling Through
TV Picture
2.1. Check for a
component of the system that is introducing DC power into the system. Disconnect
that component and check TV. If the hum bars stop, use a DC blocker down stream
from that component to block the power from getting to the TVs
2.2 If the rolling is
only on the modulated channels, check for impedance mismatch by adjusting the
video level adjustment pot.
3. Vertical Bars Rolling Through TV
Picture
Check for AC power
getting on the line. Use a ground breaker in line.
4. Black and White Lines on one Local
Channel
Move modulated channel
up to a new channel. If problem persists and all of the inputs of a multiple
input modulator are not being used, check default channels on modulator to see
if default channel is set to the same channel that the problem channel is.
5. Ghost on the
Picture
5.1 Check
for low quality combiner/spitter in system. Replace with high isolation
combiner/splitter.
5.2 Check
the type of coax used in system. Inadequate shielding in coax will cause
ghosting.
6. Snowy Picture
6.1 Verify
the modulator is set up for the proper TV channel band.
6.2 Verify
the TV is set up on the proper TV channel band.
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