Optimus STAV-3770 Audio/Video Receiver
(310-3042)                 Troubleshooting            Faxback Doc. # 56500

If the receiver is not working as it should, the following suggestions 
might help.  If you follow the suggestions in this chart and the receiver 
still does not work properly, contact your local RadioShack store for 
assistance.

Problem                Cause                 Suggestion
Power does not turn    Power cord is         Plug in the power cord.
on.                    disconnected.

                       Power circuit is      Unplug the power cord, then
                       activated.            plug it in again.

The receiver does not  Static discharge      Unplug the power cord, then
respond to button      has affected the      plug it in again. (If static
presses.               receiver.             electricity is a problem, use
                                             the remote control as much as
                                             possible.

No sound.             Incorrect connections. Check and correct the
                                             connections.

                       The mute function is  Press MUTING.
                       activated.

                       The volume is turned  Turn up the volume.
                       down.

                       Speaker wires are     Connect the speaker wires.
                       disconnected.

                       TAPE 2 function is    Press TAPE 2 so TAPE 2 clears
                       engaged.              from the display.

No picture when you    The selected video    Correct the problem with the
select a video source. source is not set     selected video source.
                       correctly.

                      Incorrect connections. Check and correct the
                                             connections.

High noise level.     Station not correctly  Adjust tuning.
                      tuned.

                      Antenna not connected. Connect the antenna.

                       FM antenna still      Stretch both ends of the
                       coiled or is not      antenna taut and reposition
                       pointing in the       the antenna.
                       correct direction.

                       AM loop antenna not   Adjust the AM loop antenna.
                       pointing in the
                       correct direction.

                       Noise is coming from  Try using an AC line noise
                       another electrical    filter to reduce the noise.
                       appliance.

Automatic tuning does  Stations are too      Use a better antenna.
not stop when search-  weak.
ing for stations.

Cannot make copies of  Tapes are protected   You cannot make a good copy.
video tapes.           by a copy protection
                       method.

                       Video connections     Check and correct the 
                       are incorrect.        connections.

Remote control does    Remote is set to      Press the CONTROL MODE button
not work.              other device.         for the device to control
                                             (CD, TAPE, or TUNER).

                       Batteries are weak.   Replace the batteries.

Remote does not cont-  Cassette deck or CD   The feature only works with
rol cassette deck or   player is not com-    Optimus Professional Series
CD player.             patible.              components.

                       Control cable is not  Properly connect the control
                       plugged in.           cable.

                       Audio cables are not  Properly connect the audio
                       plugged in.           cables.

(EB 8/25/99)