Mackie M1400/M1400i Owner's Manual - Page 14

TEMP STATUS TEMP (short for temperature) is another feature designed to keep your mind at ease. Normally the COLD LED is lit, indicating that the M•1400/M•1400i is working normally. Under extreme conditions the amplifier may overheat. You may ask, "What kind of extreme conditions?" Overheating problems are usually caused by one of the following situations: improper ventilation, high ambient temperatures, overdriving the amplifier into clipping, driving the amplifier hard into low impedance loads, frayed or partially shorted speaker cables, or defective or internally shorted speakers. The heaviest load the M•1400/M•1400i can tolerate is 2 ohms per channel (4 ohms in bridged mode). If you've got a set of speakers wired in parallel, be sure the load isn't adding up to less than 2 ohms. Anything below 2 ohms can cause the SHORT LED to light and trigger the PROTECT mode. Be Aware: If the HOT LED comes on frequently, something is overworking the M•1400/M•1400i or it's not properly ventilated. Look at each of the "extreme conditions" described above and try to determine what is causing the amplifier to overheat. Refer to "Thermal Considerations" on page 23 or to the "Troubleshooting" section in Appendix A for more help. What's that? Why doesn't the fan just go fast all the time? Well, if it did, you might actually hear it whirring during your quiet moments (there are quiet moments in your life, aren't there?). While this whirring would be of no concern in most live-sound situations, it could become annoying in a control room environment. So, when the M•1400/M•1400i is not working hard, the fan goes slow; when the music gets loud and puts the amp to work, the fan goes fast. Remember: As the load gets "heavier," its value in ohms goes down. For instance, a 2-ohm speaker load is twice as "heavy" as a 4-ohm load. As the internal temperature of the amplifier rises, the fan kicks into high speed. This occurs at 60°C (140°F). More air moves through the constant temperature gradient cooling tunnel to remove additional heat from the output transistors. However, if the internal temperature of the amplifier should exceed 80°C (176°F), the COLD LED turns off, the HOT LED turns on, and both PROTECT LEDs shine. The output of the amplifier is muted - at this point the amplifier is in Standby mode and remains there until the internal temperature POWER To make the amp operate, push the top half of the POWER switch. It clicks into place and a soothing green light adjacent to it glows. To turn the amp off, push the lower half. It'll click again and the green light will extinguish. When you power up the M•1400/M•1400i, a built-in delay circuit prevents any pops or thumps from being transmitted to the speakers due to turn-on instability in the system. Be sure the signal driving the amplifier is turned down when you first power up the system. There are few things as rude as 3 seconds of silence followed by 250 watts of full-blast stereo sound! (Well, maybe 225 kilowatts of accordian music...) cools off to a safe level (55°C or 131°F). When this occurs, the HOT LED and PROTECT LEDs turn off, the CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR CONCEIVED AND DESIGNED BY MACKIE DESIGNS INC • WOODINVILLE • WA 98072 • USA • MADE IN CHINA • FABRIQUE AU CHINE • PATENTS PENDING • COPYRIGHT ©1997 SERIAL NUMBER MANUFACTURING DATE (MONO BRIDGE) 1000 WATTS 8 OHM LOAD (STEREO) 500 W / 500 W 4 OHM LOAD OUTPUTS SUITABLE FOR CLASS 2 WIRING THE FOLLOWING ARE TRADEMARKS AND REGISTERED TRADEMARKS OF MACKIE DESIGN INC.: "MACKIE", "FR SERIES", AND THE "RUNNING MAN" FIGURE MONO OUTPUTS CH - + BRIDGE CH SUITABLE 1 2 FOR CLASS 2 WIRING COLD LED turns on + + and normal operation resumes. 120 VAC 60 Hz 1000 WATTS - - SPEAKER OUTPUTS 14 CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR CONCEIVED AND DESIGNED BY MACKIE DESIGNS INC • WOODINVILLE • WA 98072 • USA • MADE IN CHINA • FABRIQUE AU CHINE • PATENTS PENDING • COPYRIGHT ©1997 SERIAL NUMBER 1 MANUFACTURING DATE (MONO BRIDGE) 1000 WATTS 8 OHM LOAD (STEREO) 500 W / 500 W 4 OHM LOAD OUTPUTS SUITABLE FOR CLASS 2 WIRING THE FOLLOWING ARE TRADEMARKS AND REGISTERED TRADEMARKS OF MACKIE DESIGN INC.: "MACKIE", "FR SERIES", AND THE "RUNNING MAN" FIGURE MONO OUTPUTS - + BRIDGE SUITABLE FOR CLASS CH CH 2 WIRING 1 2 + + 120 VAC 60 Hz 1000 WATTS - - SPEAKER OUTPUTS