Mackie PPM1008 Owner's Manual - Page 24

PPM1008 Appendix A: Service Information If you think your powered 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.mackie.com) where you will find lots of useful information such as FAQs, and documentation. You may find the answer to the problem without having to send your mixer away. Noise • Turn the channel levels 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. Troubleshooting Bad Channel • Is the EQ set up nicely? • Is the gain switch set correctly? • Is the level up enough? • Is the channel OL led on? • Is there too much compression on channels 1-4? • Are the hi-z instrument switches set OK for guitars connected to channels 5 and 6? • Try unplugging any insert devices from the insert jacks. • Try the same source signal in another channel, set up exactly like the suspect channel. • Is phantom power required for your microphones? Bad Output • Is the main master level control turned up? • Are the graphic EQs set to reasonable levels? • Is the FX level going to the main mix, too high? • If it's one of the main speaker-level outputs, try unplugging its companion. For example, if it's the 1/4" left main output, unplug the left Speakon output. If the problem goes away, it's not the powered mixer. • If a left speaker is presumed dead, connect it to the right output instead. If the problem stays with the same speaker, check the speaker wiring, or any speaker fuses. • Unplug anything from the main line-level outputs, or other line-level outputs, such as the sub out, FX/mon 2 send, or mon 1 send, just in case one of your external pieces has a problem. • If the power amp limiter lights come on often, you may be overdriving the amplifiers. Check the loudspeaker average load impedance is not less than 4 ohms. Check the speaker wiring. 24 PPM1008 Power • The power LED should come on if the powered mixer is connected to a suitable live AC mains outlet, and the power switch is on. Check the power cord is securely plugged in. Repair For warranty service, please refer to the warranty information on page 31. Non-warranty service for Mackie products is available at a factory-authorized service center. To locate your nearest service center, visit www.mackie.com, click "Support" and select "Locate a Service Center." Service for Mackie products living outside the United States can 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, 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.