Mackie 3204-VLZ4 Owners Manual - Page 28

Appendix A: Service Information If you think your mixer 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, documentation and any updated PC drivers, etc. You may find the answer to the problem without having to send your mixer away. Troubleshooting Bad Channel • Is the channel EQ set up nicely? • Is the channel gain set correctly? • Is the channel level up enough? • Is the channel OL led on? • Is the channel balance set in the middle? • Try the same source signal in another channel, set up exactly like the suspect channel. • Is phantom power required for your microphone? Repair For warranty service, refer to the warranty information on page 39. Non-warranty service is available at a factoryauthorized service center. To locate the nearest service center, visit www.720trees.com, click "Contact Tech Support" and select "Locate a Service Center or Distributor" [3]. Service for VLZ4 mixers living outside the United States may be obtained through local dealers or distributors. If you do not have access to our website, you can call our Tech Support department at 1-800-898-3211, Monday-Friday during normal business hours, Pacific Time, to explain the problem. Tech Support will tell you where the nearest factory-authorized service center is located in your area. Bad Output • Is the main level turned up? • Are the EQs set to reasonable levels? • Are any aux returns maxed out? • Unplug anything from the other line-level outputs, such as monitor out, just in case Appendix B: Connections one of your external pieces has a problem. • Make sure that you are not overdriving your Balanced XLR Input Connector amplifiers. Check the loudspeaker average load impedance is not less than the minimum your amplifier can handle. Check the speaker wiring. The 802VLZ4 mixer has three female XLR inputs. Be sure the cables are wired per AES (Audio Engineering Society) standards: Noise Balanced XLR Input Connector • Turn the channel gains down, one by one. If the sound disappears, it's either that channel or whatever is plugged into it, so unplug whatever that is. If the noise disappears, it's from your whatever. Pin 1 - Shield (Ground) Pin 2 - Positive (+ or hot) Pin 3 - Negative (- or cold) SHIELD 2 HOT Power • The power LED should come on if the mixer is connected to a suitable live AC mains outlet, and the power switch is on. Check to make sure that the power cord is securely plugged in. COLD 3 1 1 3 2 SHIELD COLD HOT Balanced XLR Input Connector 28 VLZ4 4•Bus