Invisible Beam Entry Alert
(490-0316)                 Troubleshooting            Faxback Doc. # 18319

REPLACING THE FUSE

Check the fuse if the external alarm (or another connected security device)
is inoperative.  If the fuse is blown, replace it with a fast-acting fuse
of the same size and type, rated at 0.5 A, 250 V (such as Cat. No. 270-
1047).

1.  Unplug the AC adapter and disconnect the backup battery (if necessary).

2.  Use a Philips screwdriver to remove the screw on the top of the main 
    unit.

3.  Remove the front cover from the main unit.

4.  Remove the fuse by pulling the red ribbon around the fuse.

5.  If the fuse is blown, wrap the new fuse in the red ribbon and insert it
    in the fuse holder.

6.  Replace the front cover and the screw that secures it.

7.  Plug in the AC adapter and reconnect the backup battery (if one is 
    needed).


We don't expect you to have problems with your Invisible Beam Entry Alert, 
but if you do, refer to this table to find possible causes and remedies.
If your Entry Alert is still not operating properly, take it to your local
Radio Shack store for assistance.

    Problem                         Cause and Remedy
___________________________________________________________________________
The external alarm     Cause:   The in-line fuse is blown. 
(or other device)      Remedy:  Replace the fuse with one of the same size
does not operate.               and type (see "Replacing the Fuse").
___________________________________________________________________________
The alarm sounds       Cause:   The sensor is set out of range, causing it
when the infrared               to operate erratically.
beam is not broken,    Remedy:  Check for the distance of the main unit and
giving off false                the reflector, reset to within 3 or 50
alarms                          feet.
                                Adjust SENSITIVITY so the false alarm
                                stops.
                       Cause:   The sensor is exposed to direct sunlight,
                                or light is reflected off other objects.
                       Remedy:  Remove the light source or reposition the
                                main unit and/or reflector.
___________________________________________________________________________
The alarm continues    Cause:   The reflector surface is not set parallel
to sound falsely.               to the front of the main unit.

                       Remedy:  Readjust and/or reposition the main unit
                                and/or reflector.

                       Cause:   The sensor lenses are obscured with dust, 
                                lint, or other contaminants interfering
                                with beam reception.

                       Remedy:  Clean lenses using a nonabrasive lens 
                                cleaning solution and a lint-free cloth.
___________________________________________________________________________

LIGHTNING

Lightning damage is not common, but it can occur in electronic devices.  A
lightning strike near, or directly to, the power line may cause an
excessive surge of voltage that can damage the Entry Alert.  If you live in
an Area that has frequent or severe electrical storms, we suggest that you
purchase a surge protector to help prevent damage to your Entry Alert as a
result of power line surges.  Your local Radio Shack store has a wide
selection of surge protectors.


(CS 10/23/95)