PRO-42 Programmable Scanner
(200-0302)                 Power                      Faxback Doc. # 39658

You can power the PRO-42 from any of the following three sources.

  Internal Batteries

  Your vehicle's battery (using an optional DC adapter)

  Standard AC power (using an optional AC adapter)

Using Internal Batteries

The PRO-42 requires six AA batteries for power.  For longest battery life
and best performance, we recommend alkaline batteries (Cat. No. 23-552).
Or, use rechargeable nickel-cadmium batteries (Cat. No. 23-125).  Recharge-
able batteries do not last as long on a single charge as alkaline batteries,
but you can use rechargeable batteries again and again.

CAUTION:  The PRO-42 has a built-in charging circuit that lets you recharge
          nickel-cadmium batteries inside the scanner.  However, do not use
          this circuit when you install non-rechargeable batteries in the
          PRO-42.  Be sure to read "External Power Sources" and "Recharging
          Nickel-Cadmium Batteries".

Installing the Batteries

The PRO-42 uses a removable battery holder to make battery installation
easier.  You install the batteries in the holder first.  Then, you install
the holder into the PRO-42's battery compartment.  Follow these steps to
install or replace the batteries.

1.  Remove the battery compartment cover by pressing down on the arrow and
    sliding off the cover in the direction of the arrow.

2.  Remove the battery holder from the battery compartment and install six
    AA batteries, observing the polarity (+ and -) as marked on the battery
    holder.

3.  Place the battery holder in the battery compartment so that the holder's
    metal contacts line up with the metal contacts in the battery compart-
    ment.

    Be sure the holder's ribbon sticks out when the holder is in the com-
    partment.  The ribbon makes it easier for you to remove the holder next
    time.

4.  Replace the battery compartment cover.

Low Battery Indicator

When the batteries get weak, B appears on the display.  Immediately replace
all six batteries.  Or, if you use rechargeable nickel-cadmium batteries,
recharge all six batteries.

Using External Power

The PRO-42 has two external power jacks - PWR and CHG - and it is important
that you understand the purpose of each jack before you connect any adapter
to the PRO-42.  Improperly using the jacks can damage the scanner or the
power adapter.

The PWR jack supplies power to operate the scanner and disconnects the
internal batteries.  You can use this jack with an external power source
regardless of what kind of batteries you install in the PRO-42.

The CHG jack supplies power to operate the scanner and also supplies power
to recharge the internal batteries.  Use the CHG jack only when you install
nickel-cadmium batteries in the PRO-42.

WARNING: Never use the CHG jack when you install non-rechargeable batteries
         (standard, extra-life or alkaline) in the scanner.  If you try to
         charge non-rechargeable batteries, they get hot and can explode.

If you use only external power, do not leave the scanner unplugged for
longer than 1 hour.  If you do, your scanner loses all programmed freq-
uencies.

Using An AC Adapter

To power the PRO-42 from AC power you need Radio Shack's AC adapter (Cat.
No. 273-1455).  Plug the adapter's barrel plug into the PWR jack.  Then,
plug the adapter's power module into a standard AC outlet.

When you finish using the AC adapter, disconnect it from the AC outlet
first.  Then, disconnect it from the PRO-42.

NOTE:  If you installed rechargeable nickel-cadmium batteries in the PRO-42,
       you can connect the AC adapter to the CHG jack.  This powers the
       PRO-42 and recharges the batteries at the same time.  See "Charging
       Nickel-Cadmium Batteries".

Using A DC Adapter

WARNING:  Mobile use of a scanner is unlawful or requires a permit in some
          areas.  Check the laws in your area.

You can power the PRO-42 from your vehicle's cigarette-lighter socket, pro-
vided the vehicle has a 12-volt, negative-ground electrical system.  To do
so, you need a Radio Shack Universal DC adapter (Cat. NO. 270-1560A).

1.  Connect the adapter's blue barrel plug to the adapter's cable with the
    tip set to negative (-).

2.  Set the adapter's voltage switch to 9 V.

3.  Insert the barrel plug into the PRO-42's PWR jack.

4.  Plug the other end of the adapter into your vehicle's cigarette-lighter
    socket.

    When you finish using the adapter, disconnect it from the cigarette-
    lighter first.  Then, disconnect it from the PRO-42.

NOTES: If you install rechargeable batteries in the PRO-42, you can connect
       the adapter to the CHG jack.  This powers the scanner and recharges
       the batteries.  See "Charging Nickel-Cadmium Batteries".

       If the scanner does not properly operate when you use an adapter,
       unplug the adapter from the lighter socket and remove ashes and other
       debris.

Charging Nickel-Cadmium Batteries

The PRO-42 has a built-in charging circuit that lets you recharge nickel-
cadmium batteries (Cat. No. 23-125).  To charge the batteries, connect an AC
adapter or a DC adapter to the PRO-42's CHG jack.

WARNING:  Do not connect either adapter to the PRO-42's CHG jack if you
          install non-rechargeable batteries.  Non-rechargeable batteries
          become hot and can explode if you try to recharge them.

It takes about 10 to 18 hours to recharge fully discharged batteries.  You
can operate the PRO-42 while recharging nickel-cadmium batteries, but the
charging time is lengthened.

Charging Tips

Nickel-Cadmium batteries last longer and deliver more power if you occasion-
ally let them fully discharge.  To do this, use the scanner until the low
battery indicator appears in the display.  Then, fully charge the batteries.

Also, never charge the nickel-cadmium batteries when they are extremely hot
or cold.  If you charge the batteries when they are hot, they can permanen-
tly lose their ability to hold power.  If you charge the batteries when they
are very cold, they do not accept a full charge.

Resetting The Memory

The scanner's display might lock up the first time you connect power to it,
or if a power failure lasts for more than 1 hour.  If this occurs, use a
pointed object, such as a straightened paper clip, to press RESET while the
scanner's power is on.  The display becomes blank.

CAUTION: This procedure clears any information you have programmed into the
         scanner. Do this only when you are sure the scanner is not working
         properly.


(EB 5/20/97)

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