MPA-40 20-Watt PA Amplifier
(320-2001)                 Troubleshooting            Faxback Doc. # 51506

If you should run into difficulties, check the wiring of the system.  Are 
there any short circuits in the speaker wiring?  Have you provided 
adequate ventilation?  Did you calculate speaker impedance correctly?

Be sure microphones and connecting cables are not defective.

Be sure you are using large enough speaker wire.  You should always use 
16-gauge (or larger) wire.  The longer the run of speaker wire, the 
heavier the gauge should be.

If you have feedback problems, reposition your microphones and speakers, 
or adjust TONE or MASTER VOLUME to a lower setting.

If the amplifier does not work at all, check the fuse on the rear panel.  
If it is blown, replace it with one of the same size and type (see 
"Replacing Fuses" in Faxback Doc. # 51507.)

If you are operating the unit from a 12-volt DC power source, check the 
fuse in the supplied cable that connects to your vehicle's 12-volt 
accessory socket.  If the fuse is blown, replace it with a 4-amp 125-volt 
fuse (See "Replacing Fuses" in Faxback Doc. # 51507.)

If you cannot solve the problem, contact your local RadioShack store for 
assistance.

(EB 2/26/99)