Channel Vision E-1200 User Manual download pdf (Page 5)

3 Check all connectors for 75Ω.

Noise on the Audio

1. Insert grounding block in line and ground coax cable

before it enters the TV.

2. Use professional grade audio/video interconnect between

the components and the modulator.

Audio is Too Low

Use a Y-Connector to combine the left and

right audio before entering the modulator.

Herringbone in Picture on Modulated Channel

Disconnect modulator from local channels

an check modulated channel.

A) If there is programming move the

modulated channel.

B) If the picture is snowy, use a #3102-80 low pass filter

block noise or data coming in from cable company.

C) Separate modulated channels by two channels.

Horizontal Bars Rolling Through TV Picture

1. Check for a component of the system to introduce 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. If the rolling is only on the modulated channels, check for

impedance mismatch by adjusting the video level

adjustment pot.

Vertical Bars Rolling Through TV Picture

Check for AC power getting on the line. Use a ground

breaker in line.

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 set to.

Flashing at the Top or Middle of TV Picture

1. If flashing is on modulated channels, turn up attenuator/

down gain of modulator.

2. If flashing is on local channels, attenuate output of

amplifier.

3. Remove cable TV from system. If flash stops, install

filter #3102-__ to fix problem.

Picture is Tearing

Possible impedance problem. Check that impedance

switch is set to 75Ω.

Ghosts on the Picture

1. Terminate all unused ports with 75Ω terminator model

2101.

2. Check for low quality combiner in system. Replace with

high isolation combiner, HS model combiner.

leakage may occur or if the shielding braid is touching the

center conductor.

2. Install model CVT-15PIA amplifier after the combiner.

Grainy Modulated Channel : Good Picture on the Cable

Channels

1. Disconnect cable channels from the system and check the

modulated channels.

A) If the modulated channels are good, use a low pass filter to

"clean-up" the incoming frequencies to be modulated.

B) If the modulated channel does not improve after

disconnecting the local channels, evaluate signal loss of

modulator through the splitters and cable length of the

system. Amplify after the combiner if needed.

C) Also check the connections between modulator and the

combiner for leakage or the cable braid is touching the

center conductor.

2. Make sure the attenuator adjustment on the back of the

modulator is turned to maximum output power.

3. Check output strength with field strength meter.

4. Connect modulator directly to TV and check picture quality.

5. Check bandwidth of all splitters and amplifiers for 1GHz

capability.

6. Place TV cable setting on standard, NOT HRC or IRC.

TV Won't Tune High Enough to get Modulated Channel

1. Use an external tuner i.e. VCR or a Cable Box converter tuner

to allow the TV to view a modulated channel on a channel

through the external tuner.

2. If the modulated channel is beyond the capabilities for that TV,

the TV will not work with the system.

Cable Company Box Won't Pass a Modulated Signal

1. Connect modulator directly to TV and verify the

modulator is sending a signal the TV can receive.

2. Use model 3101 Cable Box Combiner Kit to route

the modulated signal around the cable box. See

schematic page.

Cable Company Uses All Available Channels

1. Use a low pass filter (3102) to block out channels 80 and above

for clean modulation (won't effect channels 95-99).

2. Call for pricing on a custom filter to block out a specific channel

or multiple channels.

Modulated Picture is Too Bright or Washed Out

1. Adjust the white video level. Adjust port on the

chassis located under the white cover plate above the channel

select to the proper brightness.

2. If using a camera, check positioning of the lens to be sure it's not

aimed at the sun or a reflection.

3. Adjust camera lens - see lens manual.

Modulated Picture is Too Dark

1. If baseband video is being split with a Stereo

Loop Kit or loop through quad, set impedance

matching switch or potentiometer

(termination switch) to 1ΚΩ.

2. Adjust the white video level adjust pot on the

chassis located under the white cover plate

above the channel select to the proper

brightness.

O u c h!!!

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Channel Vision E-1200 User Manual Page 5

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