Mackie M800 Owner's Manual - Page 21

As soon as the music gets loud, the amp shuts down! • Check the M•800's meters. Be sure that OL is not lighting up frequently or continuously. • Can the amp breathe? The M•800 amps draw their ventilation air in from the front and out through the side panels. They need plenty of fresh air to stay cool. Do not block the ventilation ports. • There may be a dead short somewhere in your speaker setup, or the total impedance of the load is too low. Turn the amp off and rectify that right away. Something's missing in the mid and high frequencies! • If you're using horns with compression drivers, please read the CONSTANT DIRECTIVITY section on page 15. It hurts when I touch my arm, or my leg, or even my head! • You have a broken finger. Bad sound! • Is it loud and distorted? Turn down the signal coming from the mixer or signal source. • 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's not in the amplifier. Noise/Hum • Check the signal cable between the mixer and the amplifier. Make sure all connections are good and sound. • Make sure the signal cables are not routed near AC cables, power transformers, or other EMI-inducing device. • Is there a light dimmer or other SCR-based device on the same AC circuit as the monitor? Use an AC line filter or plug the amplifier into a different AC circuit. • If possible, listen to the signal source with headphones plugged into the console. If it sounds noisy there, the problem's not in the amplifier. REPAIR Service for the M•800 amplifier is available only from one of our authorized domestic service stations or at the factory, located in sunny Woodinville, Washington. (Service for Mackie amplifiers living outside the United States can be obtained through local dealers or distributors.) If your amplifier needs service, follow these instructions: 1. Review the preceding troubleshooting suggestions. Please. 2. Call Tech Support at 1-800-258-6883, 8am to 5pm PST, to explain the problem and request an RA (Return Authorization) number. Have your amplifier's serial number ready. You must have an RA number before you can obtain service at the factory or an authorized service center. 3. Keep this owner's manual. We don't need it to repair the amplifier. 4. Pack the amplifier in its original package, including endcaps and box. This is very important. When you call for the RA number, please let Tech Support know if you need new packaging. Mackie is not responsible for any damage that occurs due to non-factory packaging. 5. Include a legible note stating your name, shipping address (no P.O. boxes), daytime phone number, RA number, and a detailed description of the problem, including how we can duplicate it. 6. Write the RA number in BIG PRINT on top of the box. 7. Ship the amplifier to us. We recommend United Parcel Service (UPS). We suggest insurance for all forms of cartage. Ship to this address: Mackie Designs SERVICE DEPARTMENT 16140 Wood-Red Rd. NE Ste 5 Woodinville, WA 98072 8. We'll try to fix the amplifier within three business days. Ask Tech Support for current turn-around times when you call for your RA number. We normally send everything back prepaid using UPS BLUE (Second Day Air). However, if you rush your amplifier to us by Next Day Air, we'll ship it back to you UPS RED (Next Day Air). This paragraph does not necessarily apply to non-warranty service. 21