TROUBLESHOOTING
The DX-440 is a ruggedly built elec-
tronic 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 initialize. This
may happen when you first install (or
replace) batteries. Remove the micro-
processor batteries, wait for about
one minute, and re-install.
Display is dim
• Weak microprocessor or radio
batteries.
• Environment
is
inappropriate for
operation; temperature is too high
or too much humidity.
RADIO
No sound
• Check the VOLUME control setting.
• Headphone jack is plugged in.
• Weak radio batteries.
• AC adapter cord not firmly plugged.
•
DC
power cord is not correctly in-
serted into cigarette lighter socket
in
vehicle operation.
• AC jack or external DC jack is plugg-
ed in when trying to operate on bat-
teries.
46
Weak or intermittent sound
• Weak radio batteries.
• Antenna adjustment insufficient.
• Weak signal. Try moving the unit
near a window when operating inside
a vehicle or
in
a metal frame building.
• Tuning slightly off-frequency. Use UP
or DOWN key to fine tune.
Frequency cannot be
keyed
in
when
direct tuning.
• EXECUTE was not pressed within 5
seconds.
• Microprocessor failed to initialize.
Remove the microprocessorbatteries,
wait
one
minute and re-install.
Scanning or memory frequency cannot
be keyed in
• EXECUTE was not pressed after the
frequency was keyed in.
Will not scan on AM
• Limit frequencies are not keyed in.
Scanning stops where there
is
no clear
signal
·Birdies-the
internally
generated
signals mixed with external signals. A
telescopic antenna is likely to pick up
these undesirable signals; use an out-
door antenna.
A few of the most common birdies are:
455 kHz 3,844 kHz 9,000 kHz
10,245 kHz 18,000
k~z
20,490 kHz
21,835 kHz 21,868 kHz
Scanning does not stop automatically
• Weak signal.
• RF GAIN
is
not set to MAX
Memorized frequency cannot be recalled
• Wrong band is set. Switch bands.
• 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 above suggested remedies
solves the problem, return your set to
your nearby Radio Shack store for
assistance.
47
