TRC-499  (210-1599)           Troubleshooting          Faxback Doc. # 15571

If the 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                       Check that:

  Trouble with reception        The CB is turned on.

                                VOLUME is turned up.

                                SQUELCH is adjusted properly.

                                The microphone is securely connected to
                                the CB.

                                The antenna cable is securely connected to
                                both the antenna and the CB.

  Trouble with transmission.    The CB is turned on.

                                The microphone is securely connected to
                                the CB.

                                All connectors are clean and tightened.

                                The antenna cable is securely connected to
                                both the antenna and the CB.

                                You are fully pressing the microphone talk
                                button.

  CB does not work at all.      The power supply (either vehicle or 12V DC)
                                and in-line fuse (replace only with an
                                identical 2-amp fuse) are working.

REDUCING NOISE

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

If you operate the TRC-499 with a 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 of 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.

    Be sure that the ground connection (black wire) is secure.

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

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


(/all-06/07/95)