Mackie SRM650 Owners Manual - Page 19

Owner's Manual Appendix A: Service Information If you think the SRM loudspeaker has a problem, please check out the following troubleshooting tips and do your best to confirm the problem. Visit the Support section of our website (www.720trees.com) where you will find lots of useful information such as FAQs and other documentation. You may find the answer to the problem without having to part with your loudspeaker. Troubleshooting No power Poor bass performance • Check the polarity of the connections between the mixer and the loudspeakers. You may have your positive and negative connections reversed at one end of one cable, causing one loudspeaker to be out-of-phase with the other. • Poor bass performance may be the result of bad AC power. See the section titled 'AC Power' on the previous page for further details. • Our favorite question: Is it plugged in? Make sure the AC outlet is live [check with a tester or lamp]. Poor sound • Our next favorite question: Is the power switch on? If not, try turning it on. • Is the Running Man logo on the front panel illuminated? If not, make sure the AC outlet is live. If so, refer to "No sound" below. • Is it loud and distorted? Make sure that you're not overdriving a stage in the signal chain. Verify that all level controls are set properly. • Is the input connector plugged completely into the jack? Be sure all connections are secure. • The internal AC line fuse may be blown. This is not a user serviceable part. If you suspect the AC line fuse is blown, please see the "Repair" section next. No sound • Is the input gain knob for the input source turned all the way down? Verify that all the gain knobs in the system are properly adjusted. Look at the level meter to ensure that the mixer is receiving a signal. • Is the signal source working? Make sure the connecting cables are in good repair and securely connected at both ends. Make sure the output level control on the mixing console is turned up sufficiently to drive the inputs of the speaker. • Make sure the mixer does not have a mute on or a processor loop engaged. If you find something like this, make sure the level is turned down before disengaging the offending switch. Noise • What is the position of the gain knob? It should be at (or near) "mic" when a mic is connected and at (or near) "line" when a line-level signal is connected. It should be "off" for all unused inputs. • Make sure all connections to the active loudspeakers are good and sound. • Make sure none of the signal cables are routed near AC cables, power transformers, or other EMI-inducing devices. • Is there a light dimmer or other SCR-based device on the same AC circuit as the SRM loudspeaker? Use an AC line filter or plug the loudspeaker into a different AC circuit. • Has it shut down? Make sure there is at least six inches of free space behind each SRM loudspeaker. Owner's Manual 19