MPA-45 (320-2035) Troubleshooting Faxback Doc. # 15700 If you have problems with the amplifier, use the following checklist to find the problem. Check all the connections. Be sure none of the speaker wiring, microphone cables, or other connecting cables are defective. Be sure you have provided adequate ventilation. Be sure you correctly calculated the total speaker impedance. Be sure the speaker wire you use is a large enough gauge: 18- gauge for lengths of wire up to 25 feet-7.5m and 16-gauge for lengths over 25 feet-7.5m. For the best results, we recommend you use the shortest length of wire possible. If you have feedback problems, reposition the microphone and speakers and adjust the FREQUENCY EQUALIZER controls if necessary. If the amplifier does not work at all, check the amplifier's fuse (on the back panel). If the fuse is blown, replace it with the supplied spare fuse or an identical 1-amp, 250 volt fuse (CA: 2-amp, 250-volt fuse). If none of the above solves the problem, take the amplifier to your local Radio Shack store. Our personnel will assist you and arrange for service, if needed. (SP/all-06/28/95)