TRC-495 40-Channel CB Base Station Transceiver
(210-1579)                 Troubleshooting            Faxback Doc. # 17946

If your CB is not working as it should, refer to the following charts to
see if you can eliminate the problem.  If you cannot, take the CB to your
local Radio Shack store.  DO NOT attempt repairs or adjustments yourself.

Symptom: Trouble with reception.

Check                             Solution

Insufficient volume?              Adjust VOLUME as needed.

Too much squelch?                 Adjust SQUELCH as needed.

CB not on operating               Switch to active channel.
channel?

Microphone connected?             Connected microphone.

Antenna connected?               Secure connections.

RF gain too                      Adjust RF GAIN as needed.
low?

Channel 9 locked?                Press CH9 again.


Symptom:  Trouble with transmission.

Check                            Solution

Transmission                     Secure antenna
cable connected                  connnector.
to antenna?

Antenna not                      Extend to full
fully extended?                  length.

Connectors corroded?             Clean and tighten.

Talk button not                  Press completely.
fully pressed?                   Hold down button
                                 while speaking.

Microphone                       Firmly press in
connector                        jack.
loose?

Symptom:  CB does not work at all.

Check                            Solution

Power connected                  Secure connections
incorrectly?                     to a live source.

Fuse in the DC                   Replace with
power lead                       identical fuse.
needs replacing?

NOISE REDUCTION

Since the receiver section of your CB is very sensitive, it easily picks
up even the smallest signals and amplifies them.  Any noise that you hear
from the CB most probably originates from external source.  The receiver
itself is exceptionally quiet.

If the noise is continuous and fairly loud, it cannot be totally eliminated 
by the automatic noise limiter (ANL) and noise blanker (NB) circuits.  You 
must solve the problem at its source.

The sources of noise might be high-voltage power lines, fluorescent
lights, electrical motors, automobile ignition systems and so on.
Also, incorrect installation of your CB, antenna, or cable might cause
noise.

  Try relocating your CB or antenna away from any noise-generating
  sources.

  Provide a good ground for your antenna with UL-listed components.

  Ensure a good shielding connection in the antenna coaxial cable.  Check
  the connnectors and cable, and make repairs if necessary.

  Check the routing of the antenna cable.  Reroute the cable and / or
  antenna away from any noise-generating sources.

In some cases, an AC line interference filter added to the AC input of
your CB can help.  If a particular appliance or motor seems to be the
major cause of noise, try to reduce or eliminate that noise problem at
the source (the appliance or motor).  You can find many useful accessories
including AC line interference filters, cables, and connectors at your
local Radio Shack store.


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