Net Media sc01 Guida Di Riferimento
SCXX_Troubleshoot.doc
Page 1 of 2
Rev 0004A
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.
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
2 = 20, 3 = 30, 4 = 40, 5 = 50, 6 = 60
Set TV to ANTENNA Tuning on UHF channels 20, 30, 40, 50, or 60.
Channels 7-12
CAModulator displays test pattern.
7=70,8=80,9=90,10=100,11=110, etc.
7=70,8=80,9=90,10=100,11=110, etc.
Set TV to CABLE Tuning on CABLE channels 70, 80, 90, 100, 110, or 120.
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.
CAModulators
This table covers all CAModulators, SC01, SC02, SCM1 and SCM2. Also see CAModulators Continued table.
Symptom
Description
Recommended Action
CAModulator does
not work.
not work.
1. The CAModulator requires proper
power and signal connections.
power and signal connections.
2. Power Injector is directional; power
cannot pass through TV side.
cannot pass through TV side.
3. Coax shielding may short circuit
power by touching center conductor.
power by touching center conductor.
4. Sufficient power must reach
CAModulator location. Each
CAModulator requires 12V DC, 300mA.
CAModulator location. Each
CAModulator requires 12V DC, 300mA.
5. Rule out external factors such as
cable, amplifiers, splitters, and other
devices.
cable, amplifiers, splitters, and other
devices.
6. CAModulator power must be
disconnected between each channel
change.
disconnected between each channel
change.
7. Numbers on printed circuit board
represent channels. Numbers on red
dip switch block do not.
represent channels. Numbers on red
dip switch block do not.
1. Disconnect and reconnect power supply. CAModulator LED should be
on. Make sure all other connections are secure.
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.
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.
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.
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.
Set CAModulator for a simple channel such UHF 40 or CABLE 80.
7. See Step 6 of this table.
Problems with other
devices connected to
coax.
devices connected to
coax.
8. Power Injector introduces 12V DC
power to coax cable.
power to coax cable.
8. Place Power Injector so that no splitter/combiners are between it and the
CAModulator.
CAModulator.
Or
Use DC Blockers to prevent power from entering other devices.
Gray, hazy, fuzzy, or
blurry picture.
blurry picture.
9. Camera is out of focus.
9. Turn lens clockwise or counterclockwise until picture is focused.
Difficulty inserting
Lens into Decora
plate (In-Wall Models)
Lens into Decora
plate (In-Wall Models)
10. Lens is designed to fit tightly into
Decora plate. Care must be taken to
prevent Decora plate from cracking.
Decora plate. Care must be taken to
prevent Decora plate from cracking.
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.
press all corners down simultaneously. Repeat until all four corners are
snapped into place.
NetMedia, Inc. 10940 N. Stallard Place, Tucson, Arizona 85737 (520) 544-4567 Fax: (520) 544-0800
mailto:sales@netmedia.com http://www.netmedia.com
T
R
O
U
B
B
L
E
S
S
H
O
O
O
T
I
N
G
C
A
A
M
O
D
U
U
L
A
T
O
R
S