IR Photorelay Alarm  (490-0310)     Operation           Faxback Doc. # 6765

After you install the alarm and reflector, the alarm's operation
depends on the setting of the ALARM/INSTANT/ANNUNCIATE mode switch.
Below is a brief description of each mode and some suggested uses.

The alarm's volume level is greater in the ALARM mode than in the
INSTANT or ANNUNCIATE modes.

ALARM MODE

In the ALARM mode, the alarm sounds for about 5 minutes when
something blocks the beam.  It continues to sound even if the beam's
path is restored.  You can stop the sound by changing the setting of
the mode switch or by setting the POWER switch to OFF.

After 5 minutes the alarm stops sounding and resets.

Note:  The alarm stops and resets even if something still blocks the
       beam at the end of the 5-minute cycle.  The beam must be
       completed and then interrupted again to set off the alarm
       again.

INSTANT MODE

In the instant mode, the alarm sounds when something blocks the beam,
but silences immediately when the path of the beam is restored.

Use this mode in your home or business to tell when someone enters or
leaves a room.  This is also the best mode to use when you install
and test the alarm.

ANNUNCIATE MODE

In the ANNUNCIATE mode, the alarm only sounds two short tones,
regardless of how long the beam is blocked.

You can use this mode for the same applications as the INSTANT mode:
the advantage is that the tone does not continue to sound if someone
stays between the alarm and reflector.

TESTING/MAINTENANCE

In most applications the alarm is "tested" in everyday use.  You can
test the alarm any time by turning on the power and interrupting the
beam.  Use the INSTANT or ANNUNCIATE mode during testing.

To test battery power, unplug the AC cord and interrupt the beam.  To
conserve battery power, turn off the alarm when you have confirmed
proper operation and reconnect the AC power.

LIGHTNING

Lightning damage is not common.  However, lightning striking the
power line can damage the alarm.

If you live in an area with frequent electrical storms, we suggest
that you purchase a spike protector, such as our Cat. No. 61-2780 or
61-2781 to help reduce the possibility of damage.

REPLACING THE FUSE

If your alarm does not work, the fuse might be blown.  Follow these
steps to check and replace the fuse.

Caution:  Replace only with a 2.5A, 250-volt fuse (Cat. No. 270-
          1260).

1.  Set the POWER switch to OFF and unplug the AC power cord.

2.  Loosen the fuse holder cover on the back panel with a
    screwdriver.

3.  Remove the cover and take out the fuse.

4.  Check the fuse to see if it is blown.

5.  Replace the fuse only with one of the same type and rating.

6.  Put the new fuse into the holder and close the cover tightly with
    the screwdriver.

7.  Plug in the AC power cord and set the POWER switch to ON.

IF YOU HAVE ANY PROBLEMS

We hope you don't...but if you do, try these suggestions:

  Check the distance between the alarm and the reflector.  The
  distance should be within 3-50 feet.  If the distance is out of
  this range, the alarm might not operate normally.  Adjust the
  SENSITIVITY control so that the false alarm stops.

  Be sure the surface of the reflector is parallel to the front of
  the alarm.  If not, reposition the alarm or the reflector.

Check the alarm lenses to be sure that they are not dirty.  If they
are, clean the lenses.

Modifying or tampering with your alarm's internal components can
cause a malfunction and might invalidate your warranty.  If the alarm
does not perform as it should, take it to your local Radio Shack
store for assistance.

(LB/all-07/12/94)