Specifications

RF OUTRF OUT
DC 15V INDC 15V IN
OUTPUT
IR
OUTPUT
IR
CABLECABLE
ANTENNAANTENNA
ANTENNA + CABLEANTENNA + CABLE
VIDEOVIDEO
AUDIOAUDIO
L RL R
BB
AA
VIDEOVIDEO
AUDIOAUDIO
L RL R
DD
CC
11
44
33
22
1122
33
44
OUTPUT
IR
OUTPUT
IR
Troubleshooting IR
Troubleshooting Video
If your IR system is not working, check to see if the modulator’s IR
engine is feeding approximately 12 Volts DC onto the coax between
the shield and center pin. (Any voltage between 8-12VDC is OK). If
there is no voltage between the center pin and shield, check the
connectors on each end of the coax.
If your modulated signal looks ‘snowy’ or if you don’t see it at all, follow
these steps to correct the problem.
1. If you are combining the modulator with the an antenna or CATV signal
(as shown on pages 4 & 5) disconnect the antenna or CATV signal so
that the modulator is the only signal in the system.
a. If this solves the problem, you will either have to change the channel
you are modulating on to a truly empty channel or you will have to filter
out the signals that are interfering with the modulator.
b. If disconnecting the antenna or cable feed does not solve the problem,
continue to step 2.
2. Connect the RF output of the modulator directly to the RF input of a TV
(make sure the signal is not feeding through any unnecessary devices
such as VCRs or cable boxes).
a. If this solves the problem, there is something wrong with your
distribution system. Reconnect your distribution system one component
at a time until you identify which piece is causing the problem.
b. If connecting directly to a single TV did not solve the problem, continue
to step 3.
3. With the modulator still connected directly to the TV, make sure the TV
tuner is set to the same mode as the modulator. TVs have can either be
setup to receive antenna signals or CATV signals. If the TV is setup to
receive antenna signals and the modulator is set for CATV signals, you
will not see the modulated signal on the desired channel. You may need
to perform an auto-program search with the TV. This is typically an
option in the TV’s setup menu. Before the channel search begins, the TV
will usually prompt you to choose the type of input signal: either CATV or
Antenna/Off-air.
a. If auto-programming finds the modulated channel, then reconnect the
system. If you have further problems repeat steps 1 & 2.
b. If auto-programming does not find the channel or if it finds the channel
and there is only a empty black screen, continue to step 4.
4. An empty black screen is usually an indication that there is no signal
getting into the modulator. Verify that an active composite video signal
is connected to the yellow RCA input jack on the modulator. An easy
way to verify the composite video signal is to connect it directly to the
yellow RCA input of a TV set.
a. If you do not have an active video signal, try another source. When
you have verified that the composite video signal is active, reconnect it
to the modulator and repeat step 3.
b. If there was no problem with composite video signal when you
connected it directly to the TV, then call tech support for further
assistance: 1-800-840-0288.
VDC
If you are trouble shooting a whole-house IR system and you
measure approximately 8-12 Volts DC on the output of the Modulator,
but 0 Volts DC on the output of your RF splitter, check the following
items:
1. Make sure you are using a DC passing splitter. Traditional splitters
will short out DC voltage traveling on the coax and prevent your IR
system from working.
2. Make sure that there are DC blocks (model 3109) on any output
from the RF splitter that will not be connected to an IR-4100. If
outputs from the splitter are connected directly to TV sets without
going through a IR-4100 or DC block, the system voltage will be
shorted out by the input of the TV set.
3. Double check the fittings at the end of your coax cables. If a little
bit of shielding is touching the center pin, the voltage will be
shorted out and the system will not work.
Don’t worry. The IR-4000 engine has a current limiting circuit. If the
engine is shorted (due to a bad connection or a non-DC passing
splitter) nothing will be harmed.
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