TRC-483  (210-1557)          Troubleshooting           Faxback Doc. # 7216

If your CB is not working as it should, follow the suggestion 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 & Solution              │
├──────────────────┼─────────────────────────────────────────────────────│
│ Trouble with     │     Be sure the CB is turned on.                    │
│ reception.       │     Be sure the PA button is not pressed in.        │
│                  │     Be sure VOLUME is turned up.                    │
│                  │     Be sure SQUELCH is adjusted properly.           │
│                  │     Be sure the microphone is securely connected to │
│                  │     the CB.                                         │
│                  │     Be sure the antenna cable is securely connected │
│                  │     to both the antenna and the CB.                 │
├──────────────────┼─────────────────────────────────────────────────────┤
│ Trouble with     │     Be sure the microphone is securely connected to │
│ transmission.    │     the CB.                                         │
│                  │     Extend the antenna to its full length.          │
│                  │     Clean and tighten all connectors.               │
│                  │     Be sure you are fully pressing the microphone   │
│                  │     talk button.                                    │
│                  │     Be sure the antenna cable is securely connected │
│                  │     to both the antenna and the CB.                 │
├──────────────────┼─────────────────────────────────────────────────────┤
│ No channel       │     Be sure the PA button is not pressed in.        │
│ selection.       │     Be sure the CH9 button is not pressed in.       │
├──────────────────┼─────────────────────────────────────────────────────┤
│ CB does not      │     Check the power supply (either automobile or 12V│
│ work at all.     │     DC) and in-line fuse (replace only with an iden-│
                   │     tical 2-amp fuse; see "Replacing the 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-483 with the vehicle's engine off, you should not
have 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-suppresion
    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 the 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.

(CJD/all-07/19/94)