TRC-464  (210-1554)          Troubleshooting          Faxback Doc. # 6313

If your CB is not working as it should, follow the suggestions below to
see if you can eliminate the problem.  If you cannot, take the CB to your
local Radio Shack store for assistance.

Symptom              Solution

Trouble           *  Be sure VOLUME is turned up.
receiving         *  Be sure SQUELCH is adjusted properly.
                  *  Be sure the CB is switched to an operating channel.
                  *  Be sure the antenna cable is securely connected to
                     both the antenna and the CB.

Trouble           *  Be sure the antenna cable is securely connected to
transmitting         both the antenna and the CB.
                  *  Be sure all connections are secure and free of
                     corrosion.
                  *  Be sure the microphone is securely connected to the
                     CB.
                  *  Be sure you are fully pressing the microphone talk
                     button.

CB does not       *  Check the power supply (either automobile or 12V
work at all          DC) and in-line fuse (replace only with an
                     identical 2-amp fuse).

REDUCING NOISE

The Automatic Noise Limiting (ANL) circuit helps keep background noise to
a minimum.  However, strong sources such as your vehicle's ignition,
another radio, or spark plugs may be more than the circuit can compensate
for.

If you operate the TRC-464 with the vehicle's engine off, you should not
have any problems with noise.  If you use the CB with the engine on, you
can determine the source of the noise by turning off the engine and
operating the CB with the ignition set to ACC.  If most or all of the
noise goes away, the problem is in your vehicle's ignition or electrical
system.

Here are a few hints to help you reduce or eliminate such noise:

Replace old ignition wires with new, high-voltage, noise-suppression
wires.

Install noise suppressors on your spark plugs, or install new spark
plugs that have built-in suppressors.

If problems persist, check your alternator/generator, regulator, and
gauges.  Noise from these sources can be reduced or eliminated using
bypass capacitors at the various output voltage points.

Your local Radio Shack store has a wide selection of noise-suppression
accessories.

(BR/smc-05/04/94)