Mackie 408M Owner's Manual - Page 27

APPENDIX A: Service Info Warranty Service If you think your powered mixer has a problem, please do everything you can to confirm it before calling for service, including reading through the following Troubleshooting section. Of all Mackie products returned for service (which is hardly any at all), many are coded "CND" - Could Not Duplicate, which usually means the problem lay somewhere else in the system. Here are some things you can check: Troubleshooting No power! • Our favorite question: Is it plugged in? Make sure the AC outlet is live (check with a tester or lamp). • Our next favorite question: Is the POWER switch on? If not, try turning it on. • Is the green POWER light on the front panel illuminated? If not, make sure the AC outlet is live. If so, refer to "No sound" below. • The AC line fuse inside the mixer is blown. This is not a user-serviceable part. Refer to "Repair" on page 28 to find out how to proceed. No sound! • Are the INPUT LEVEL SET controls turned all the way down? Follow the procedures in the "Quick Start" section on page 6 to verify that all the level and volume controls are properly adjusted. • Is the signal source working (and making union scale)? If it's a microphone, make sure the mic cable is in good repair and securely connected at both ends. If it's a condenser microphone, make sure the PHANTOM POWER switch is turned on. If it's an instrument, again make sure the connecting cables are in good repair and securely connected at both ends. Make sure the output volume (gain) control for the instrument is turned up sufficiently to drive the inputs of the mixer. You should be able to see the INPUT LEVEL SET LED blink when you turn up the INPUT LEVEL SET control. If you're monitoring the TAPE IN, make sure the tape deck's Tape/Source switch is set to "Tape," and make sure the TAPE IN LEVEL control on the powered mixer is turned up to unity (center position). • Is the channel's VOLUME control and the MAIN MASTER control properly set? Refer to the "Level Setting Procedure" on page 6. • Is there something plugged into the channel's INSERT jack? Plugging into the INSERT jack breaks the signal path for the channel. Try unplugging any INSERT devices. If that fixes the problem, make sure you're using a properly wired send/ return cable (see "Making the Connections" on page 21). Make sure the volume (gain) controls on the external processor connected to the INSERT jack are properly set. • Is there something plugged into the POWER AMP IN jacks? Plugging into the POWER AMP IN jacks breaks the signal path between the mixer and the amplifier. However, the signal source you have plugged into the POWER AMP IN jacks should be heard over the speakers connected to the SPEAKER OUT jacks. • Do you have any external equalizers, compressors or processors connected between the MIXER OUT and POWER AMP IN jacks? If so, make sure they are working correctly. • Are there fuses in the speaker or in-line fuses in the speaker wire? Check 'em to see if they're blown. • Are the speakers working properly? If you have another amplifier that you know works, plug the speakers into it to make sure they work. One side is way louder than the other! For the 408S and 808S: • Do the LEVEL meters read the same on both sides? If not, the PAN control on the signal source's channel strip may be turned too far to one side. If you're using a stereo signal source, it may be delivering an out-of-balance stereo signal. • Try swapping sides: Turn off the powered mixer, swap the speaker cables at the SPEAKER OUT jacks, turn the mixer back on. If the same side is still louder, the problem is with your speakers or speaker cabling. If the other side is louder now, the problem is with the mixer, the amp, or the signal source. 27