Net Media SC01, SC02, SCM1, SCM2 Troubleshooting Manual

Troubleshooting Tips

There are many variables involved in Video Distribution. Cable lengths, splitter/combiners, and pre-existing signals can all impact picture
quality. In general, good results are achieved when the field strengths (dB) of each signal are balanced throughout the system. Combinations of
amplifiers, attenuators, and tilt compensators may be necessary to ensure an equalized and sufficient delivery of signal to each television. You
may wish to consult your local A/V Professional whose tools and expertise can help provide you with optimal results.

CAModulator Channels

Channel range effects SC01, SC02, SCM1 and SCM2 CAModulator function.

CAModulator Description Television

Channels 0 and 1 Disable CAModulator signal. No signal should appear on TV.
Channels 2-6 CAModulator displays test pattern.

2 = 20, 3 = 30, 4 = 40, 5 = 50, 6 = 60

Channels 7-12 CAModulator displays test pattern.

7=70,8=80,9=90,10=100,11=110, etc.
Channel 13 Not valid channel selection. No signal should appear on TV.
Channels 14-69 UHF Stations 14-69 Set TV to ANTENNA Tuning on UHF channels 14-69.
Channels 70-94 CABLE Stations 70-94 Set TV to CABLE Tuning on CABLE channels 70-94.
Channels 95-99 Not valid channel selections. No signal should appear on TV.
Channels 100-125 CABLE Stations 100-125 Set TV to CABLE Tuning on CABLE channels 100-125.

Set TV to ANTENNA Tuning on UHF channels 20, 30, 40, 50, or 60.

Set TV to CABLE Tuning on CABLE channels 70, 80, 90, 100, 110, or 120.

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CAModulators

This table covers all CAModulators, SC01, SC02, SCM1 and SCM2. Also see

Symptom Description Recommended Action

CAModulator does
not work.

Problems with other
devices connected to
coax.

Gray, hazy, fuzzy, or
blurry picture.

Difficulty inserting
Lens into Decora
plate (In-Wall Models)

1. The CAModulator requires proper
power and signal connections.

2. Power Injector is directional; power
cannot pass through TV side.

3. Coax shielding may short circuit
power by touching center conductor.

4. Sufficient power must reach
CAModulator location. Each
CAModulator requires 12V DC, 300mA.

5. Rule out external factors such as
cable, amplifiers, splitters, and other
devices.

6. CAModulator power must be
disconnected between each channel
change.

7. Numbers on printed circuit board
represent channels. Numbers on red
dip switch block do not.

8. Power Injector introduces 12V DC
power to coax cable.

9. Camera is out of focus. 9. Turn lens clockwise or counterclockwise until picture is focused.

10. Lens is designed to fit tightly into
Decora plate. Care must be taken to
prevent Decora plate from cracking.

1. Disconnect and reconnect power supply. CAModulator LED should be
on. Make sure all other connections are secure.

2. Check Power Injector direction so that MOD Arrow goes toward
CAModulator and TV Arrow goes toward television.

3. Check all coax F-connectors and replace if necessary.

4. Long cable runs will diminish power, place Power Injector closer to
CAModulator. Amplifiers and some splitter/combiners do not pass DC
power, replace them or move Power Injector so that those devices are not
between it and CAModulator. Multiple CAModulators require more power,
use a larger power supply that gives each CAModulator sufficient power.

5. Connect CAModulator to coax, coax to Power Injector, and Power
Injector directly to one TV. Set TV to channel 70, then program
CAModulator to channel 70 and look for camera picture. If TV will not tune
to channel 70, see No picture on programmed cable channel 70-94 section
of the CAModulators Continued table.

6. Review programming steps. Disconnect and reconnect power supply.
Set CAModulator for a simple channel such UHF 40 or CABLE 80.

7. See Step 6 of this table.

8. Place Power Injector so that no splitter/combiners are between it and the
CAModulator.

Use DC Blockers to prevent power from entering other devices.

10. Place Decora plate on flat surface. Use both hands to center lens and
press all corners down simultaneously. Repeat until all four corners are
snapped into place.

CAModulators Continued

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table.

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NetMedia, Inc. 10940 N. Stallard Place, Tucson, Arizona 85737 [phone] Fax: [phone]

mailto:[e-mail] http://www.netmedia.com

SCXX_Troubl eshoot.doc Page 1 of 2 Rev 0004A

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Troubleshooting Tips

CAModulators Continued

This table covers all NetMedia CAModulators, SC01, SC02, SCM1 and SCM2. Also see

Symptom Description Recommended Action

No picture after
changing channel.

No picture on
programmed UHF
channel 14-69.

No picture on
programmed CABLE
channel 70-94 or
100-125.

No picture through
Cable Box.

1. The CAModulator power must be
disconnected between each channel
change.

2. TV must be set to ANTENNA Tuning in
order to view UHF channels 14-69.

3. TV must be set to CABLE Tuning in
order to view CABLE channels 70-94 or
100-125.

4. Cable Boxes normally use CABLE
Tuning.

1. Review programming steps. Disconnect and reconnect power supply.
Set CAModulator for a simple channel such UHF 40 or CABLE 80.

2. Tune TV to channel 70. If
Tuning mode.

Check the switches or menus on your television and change from CABLE
Tuning to ANTENNA Tuning.

Leave the TV in CABLE Tuning and program the CAModulator for a
CABLE channel from 70-94 or 100-125.

3. Tune TV to channel 70. If
ANTENNA Tuning mode.

Check the switches or menus on your television and change from
ANTENNA Tuning to CABLE Tuning.

Leave the TV in ANTENNA Tuning and program the CAModulator for a
UHF channel from 14-69.

4. Program the CAModulator for a CABLE channel from 70-94 or 100-125.

successful

unsuccessful

CAModulators

, your TV is probably in CABLE

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, your TV is probably in

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No picture on
programmed CABLE
channel 95-99

CAModulator has
"forgotten"
programmed
channel.

Bad signal on station
next to programmed
channel.

"Noise" on
programmed CABLE
channel 70-94 or
100-125.

Weak, “snowy”
signal on Cable or
Antenna channels
after CAModulator
added.

Weak, “snowy”
signal on
programmed
channel.
Horizontal, diagonal,
or herringbone lines
on any distributed
channel.

5. Cable Boxes sometimes put the
CAModulator signal on a different channel
or do not pass the signal at all.

6. If you cannot get a signal through the
Cable Box then you must bypass it and

SWITCH THE TV

the CAModulator channel.

7. The CAModulator does not program
channels 95-99.

8. The channel is not forgotten, though a
momentary power outage may
occasionally scramble the signal.

9. Modulated channels will interfere with
adjacent channels, especially the one just
below it.

10. Local UHF broadcast channels can
interfere with CABLE channels. As a
rough guide,
UHF channel + 51 = CABLE channel.
Example: UHF 40 is close to CABLE 91.

11. Cable and Antenna signals are
generally not as strong as the
CAModulator’s. Also, the additional cable
and combiners disperse and weaken their
signal strength.

12. CAModulator signal is being dispersed
and weakened through distribution
system.

13. Signal may be too strong for television.
CAModulator output is at least +27dB.
Combined signals are unbalanced.

between channel 3 and

5. Check for the CAModulator signal several channels above and below
the programmed channel.

6. Combine the CAModulator signal to the cable signal after the Cable
Box.

Or
Split the combined cable/CAModulator signal before the Cable Box and
recombine again after the Cable Box. Use a filter or trap to eliminate
channel 3 on the bypassed side.

Or
Use an A/B Switch to select between modulated and cable signal.

7. Program the CAModulator for a CABLE channel from 70-94 or 100-125.

8. Disconnect CAModulator power supply and reconnect after waiting for
several seconds. Programmed channel should reappear.

9. Program channels with at least one blank channel above and below.

10. Program the CAModulator for a CABLE channel 70-94 or 100-125 that
is not close to a local UHF broadcast channel frequency.

11. Amplify Cable or Antenna signal before combining with CAModulator
to prevent signal loss upstream and to help signal balance. Use other
combinations of amplifiers, attenuators, and tilt compensators to provide a
balanced and sufficient signal to each television.

12. See Step 11 on this table.

13. Weaken signal with gain controls, attenuators, splitter/combiners, or
longer cable lengths. Use other combinations of amplifiers, attenuators,
and tilt compensators to provide a balanced and sufficient signal to each
television.

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NetMedia, Inc. 10940 N. Stallard Place, Tucson, Arizona 85737 [phone] Fax: [phone]

SCXX_Troubl eshoot.doc Page 2 of 2 Rev 0004A

mailto:[e-mail] http://www.netmedia.com