DX-440 AM/FM Direct Entry Communications Receiver
(200-0221)                 Troubleshooting            Faxback Doc. # 17504

The DX-440 is a ruggedly built electronic unit with all parts
conservatively rated.  However, you should treat it with care; don't
subject it to excessively rough handling.  You will find it will give you
long life enjoyment if kept free from excessive humidity.

If you have problems--(we hope you don't),-- check the following:

FREQUENCY DISPLAY

No/incorrect display                Weak microprocessor or radio batteries.

                                    Microprocessor fails to intialize. 
                                    This may happen when you first install
                                    batteries.

Display is dim                      Weak microprocessor or radio batteries.

                                    Environment is inappropriate for
                                    operation; temperature is too high or
                                    there is too much humidity.

RADIO

No sound                            Check the VOLUME control setting.

                                    Headphone jack is plugged in.

                                    Weak radio batteries

                                    AC adapter cord is not firmly plugged.

                                    DC power cord is not correctly inserted
                                    into cigarette lighter socket in
                                    vehicle operation.

                                    AC jack or external DC jack is plugged
                                    in when trying to operate on batteries.

Weak or intermittent sound          Weak radio batteries

                                    Antenna adjustment insufficient.

                                    Weak signal.  Try moving the unit near
                                    a window when operating in a vehicle
                                    or in a metal frame building.  

Frequency cannot be keyed           EXECUTE was not pressed within 5
in when direct tuning.              seconds.

                                    Microprocessor failed to initialize. 
                                    Remove the micropressor batteries. 
                                    Wait one minute and reinstall.

Scanning or memory frequency        EXECUTE was not pressed after the
cannot be keyed in.                 frequency was keyed in.

Will not scan on AM                 Limit frequencies are not keyed in.

Scanning stops where there          Birdies -- the internally generated
is no clear signal                  signals.  A telescopic antenna is
                                    likely to pick up these undesirable
                                    signals; use an outdoor antenna.

                                    A few of the most common birdies are:
                                       455 kHz     3,844 kHz     9,000 kHz
                                    10,245 kHz   18,000 kHz    20,490 kHz
                                    21,835 kHz   21,868 kHz

Scanning does not stop              Weak signal.
automatically
                                    RF GAIN is not set to MAX

Memorized frequency cannot          Wrong band is set.  Switch bands.
be recalled
                                    Memory has been erased.  Re-enter the
                                    frequency.

SLEEP does not function             The sleep button is not pressed

                                    The power switch is set to on 

If none of the suggested remedies solves the problem, return your set to 
your nearby Radio Shack store for assistance.


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