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17
Symptom #5: Intermittent IR control (i.e. buttons on remote
need to be pressed multiple times)
Cause
Solution
1.
Plasma Interference.
Plasma interference can be re-
flected off of any item it comes into
contact with within approx. 3 feet
of the front of the display. Keeping
this in mind, make sure that the IR
Receiver is free from any object that
might reflect Plasma interference
back into the receiving eye.
2.
Relatively high levels of ambi-
ent noise. This can be due to
any of the following: sunlight,
florescent lighting or Plasma
Displays.
Reposition the IR Receiver or elimi-
nate the light source.
3.
Long Wire Runs – shielded wire
typically of 100 feet (30 meters)
or longer causes a filter effect
due to accumulated capaci-
tance of the wire. Intermittent,
or no IR control, could actually
be because of the longer wire
runs.
Putting a 470-ohm resistor in paral-
lel at the Connecting Block between
signal and ground will effectively
discharge the capacitance of the
wire. This will allow the signal to
travel farther on shielded wire.
Adding a resistor between the input
and ground of the Connecting Block
will drop the IR level down some-
what. Passive Connecting Blocks,
such as the 789-44, may not have
enough signal output for consistent
control of the equipment. You may
have to upgrade to an amplified
Connecting Block to bring the IR
level back to normal. In these
cases, the 791-44 would be an ideal
Connecting Block for single zone
systems while the 795-20 would
work best for a 2-4 zone system.
4.
Low batteries in Remote
Replace batteries.
