Mackie FR800/FR1400/FR2500 FR Series Owner's Manual - Page 12

FR SERIES AMPLIFIERS Appendix A: Service Information Warranty Service Details concerning Warranty Service are spelled out in the Warranty section on page 19. If you think your amplifier has a problem, please do everything you can to confirm it before calling for service. Doing so might save you from the deprivation of your amplifier. These may sound obvious to you, but here are some things you can check. Read on: Troubleshooting No Power • Our favorite question: Is it plugged in? • Make sure the power cord is securely seated in the IEC socket and plugged all the way into the AC outlet. • Make sure the AC outlet is live (check with a tester or lamp). • Make sure the front panel POWER switch is in the ON position. • Has the BREAKER switch popped? • Is anything on the front panel illuminated? If not, make sure the AC outlet is live. • Are all the lights out in your town? If so, contact your local power company to get power restored. • If nothing is illuminated, and you are certain that the AC outlet is live, it will be necessary to have your amplifier serviced. There are no user serviceable parts inside. Refer to "Repair" on the next page to find out how to proceed. No Sound or Low Output • Loudspeaker cables or connectors are not wired correctly or they are faulty. Check all cabling, referring to these instructions for the correct connections. The best way to check a suspect cable is to swap it with a known good cable. Read the loudspeaker's input panel to verify correct cable connections. • Loudspeaker is not working. Connect the loudspeaker cable to a known good loudspeaker leaving all equipment set to the same levels. If the problem disappears, the loudspeaker is probably not working correctly. • Are the channel Level controls turned up? Slowly turn them up and see if you hear anything. • Is the signal source turned up? Make sure the signal level from the mixing console (or whatever device immediately precedes the amplifier) is high enough to produce sound in the amplifier. The SIG LEDs should be blinking to indicate that signal is present. • If the speakers are wired for BRIDGE mode, make sure the AMP MODE switch is set to BRIDGE. • If the amplifier has gotten extremely hot, the thermal protection circuit may have activated. Allow the amplifier to cool down and normal operation should resume. • Are there fuses in the speakers, or in-line fuses in the speaker wire? Check to see if they're blown. Distorted Sound • The power amplifier is clipping. The signal level is exceeding the limits of your system and you must reduce the level from your mixer or signal source. • Ensure that no equipment in the signal chain is being over driven. For example: input(s) or summing bus in the mixing console, equalizers etc. • Is the input connector plugged completely into the jack? Check the speaker connections and verify that all connections are tight and that there are no stray strands of wire shorting across the speaker terminals. • If possible, listen to the signal source with headphones plugged into the console. If it sounds bad there, the problem is not in the amplifier. • Loudspeakers not working properly. Partial Sound (frequency band missing) • Incorrect EQ settings in the electronic equipment. Ensure all EQ settings and filters on the mixing console or preamplifier and on other equipment are set for normal operation. Ensure level controls on electronic crossovers and associated amplifiers are correctly set and that all cables and connections for such equipment are connected and working properly. • Loudspeaker not working properly. Swap with a good one. • Is the LED next to the POWER switch illuminated? If not, make sure the AC outlet is live. • The fuses inside the amplifier may have blown. These are not a user-serviceable. See next page about service. 12 FR SERIES AMPLIFIERS