DX-390  (200-0214)            Preparation              Faxback Doc. # 3608

SETTING THE MW TUNING INCREMENT

In the United States, the Federal Communications Commission (FCC) assigns
frequencies for stations in the MW band in 10-kilohertz increments.  (In
the United States, we commonly call the MW band the AM band.)  In Europe
and some other parts of the world, MW frequencies are assigned in 9-
kilohertz increments.  Be sure MW STEP is set for the part of the world
you are in.

The MW STEP switch is located inside the battery compartment.  Set it
before you install the back-up batteries.

INSTALLING BACK-UP BATTERIES

Back-up batteries power the receiver's clock and save the stations stored
in memory if the receiver's primary power source is interrupted.

The receiver uses three AA batteries for back-up power.  For best
performance, we recommend alkaline batteries, such as Radio Shack Cat. No.
23-552.

NOTE:  You cannot operate the receiver using only the back-up batteries. 
       If you press POWER when the back-up batteries are the only
       available power source, E flashes on the display.

Follow these steps to install the back-up batteries.

1.  Remove the battery compartment's cover by pushing the cover in the
    direction of the arrow.

2.  Install three AA batteries, as indicated by the illustration near the
    battery compartment.  Note the polarity markings (+ and -).  For easy
    removal, place the batteries on top of the lift-out ribbon.

3.  Replace the battery compartment cover, or install additional batteries
    for primary power as described in "Internal Battery Power" under
    "Connecting to Primary Power."

To check the back-up batteries' power level, remove the primary-power
batteries or unplug the AC or DC adapter.  Then, look at the receiver's
display.  If it is dim, replace the back-up batteries.

CONNECTING TO PRIMARY POWER

You can power the receiver from internal batteries, standard AC power, or
your vehicle's battery.

Internal Battery Power

You can power the receiver from four D batteries.  For best performance,
we recommend alkaline batteries, such as Radio Shack Cat. No. 23-550.

Installing the Primary-Power Batteries:  Follow these steps to install
batteries for use as the primary power source.

1.  Remove the battery compartment's cover by pushing the cover in the
    direction of the arrow.

2.  Install four D batteries as indicated by the illustration near the
    battery compartment.  Note the polarity markings (+ and -).  For easy
    removal, place the batteries on top of the lift-out ribbon.

3.  Replace the compartment cover.

Checking the Primary-Power Batteries:  To check the primary-power
batteries, turn off the receiver.  The battery power indicator appears on
the display for several seconds.  Fresh batteries show a power level of 7.
When the indicator shows a power level of 2, replace the primary-power
batteries.

NOTES:  If you press POWER to turn on the receiver when the primary-power
        batteries are dead, E flashes on the display.

        If you do not plan to use the receiver for several days, or if you
        are using another power source, we recommend you remove the
        primary-power batteries.  This helps protect the receiver from
        possible battery leakage.

AC Power

With an optional AC adapter, such as Cat. No. 273-1663, you can power the
receiver from standard AC power.

CAUTION:  You must use an AC adapter that supplies 6 volts with the center
          tip set to negative.  It must deliver at least 400 milliamps,
          and its plug must properly fit the receiver's DC IN 6V jack. 
          Using an adapter that does not meet these specifications could
          damage the receiver or the adapter.

Follow these steps to use AC power.

1.  Set the adapter's voltage switch to 6V.

2.  Line up TIP on the green-tipped barrel plug with -NEG on the adapter's
    socket, and insert the plug.

3.  Insert the barrel plug's other end into the receiver's DC IN 6V jack. 
    This disconnects the primary power batteries.

4.  Plug the adapter into a standard AC outlet.

DC Power

With an optional DC adapter, such as Cat. No. 273-1802, you can power the
receiver from your vehicle's battery.

CAUTIONS:  You must use a DC adapter that supplies 6 volts with the center
           tip set to negative.  It must deliver at least 400 xcmilliamps,
           and its plug must properly fit the receiver's DC IN 6V jack. 
           Using an adapter that does not meet these specifications could
           damage the receiver or adapter.

           You vehicle must have a 12-volt DC, negative-ground electrical
           system.

           To protect your vehicle's electrical system, always unplug the
           adapter into the receiver before you plug it into the
           cigarette-lighter socket, and always unplug the adapter from
           the cigarette-lighter socket before you unplug it from the
           receiver.

Follow these steps to use DC power.

1.  Set the adapter's voltage switch to 6V.

2.  Insert the adapter's barrel plug into the receiver's DC IN 6V jack.

3.  Insert the adapter's large plug into the vehicle's cigarette-lighter
    socket.  This disconnects the primary-power batteries.

(ALL-12/13/94)