Mackie M1400/M1400i TEMP STATUS, POWER, Remember:

TEMP STATUS			Be Aware: If the HOT LED
TEMP (short for temperature) is another			comes on frequently, some-
			thing is overworking the
feature designed to keep your mind at ease.
			M•1400/M•1400i or it’s not
Normally the COLD LED is lit, indicating that
			properly ventilated. Look
the M•1400/M•1400i is working normally.
		at each of the “extreme conditions” described
Under extreme conditions the amplifier may
		above and try to determine what is causing the
overheat. You may ask, “What kind of extreme
		amplifier to overheat. Refer to “Thermal Consid-
conditions?”
		erations” on page 23 or to the “Troubleshooting”
Overheating problems are usually caused by
		section in Appendix A for more help.
one of the following situations: improper venti-
lation, high ambient temperatures, overdriving			What’s that? Why doesn’t the
the amplifier into clipping, driving the ampli-
			fan just go fast all the time?
fier hard into low impedance loads, frayed or
			Well, if it did, you might actu-
partially shorted speaker cables, or defective
			ally hear it whirring during
or internally shorted speakers.
			your quiet moments (there
The heaviest load the M•1400/M•1400i can
		are quiet moments in your life, aren’t there?).
tolerate is 2 ohms per channel (4 ohms in
		While this whirring would be of no concern in
bridged mode). If you’ve got a set of speakers
		most live-sound situations, it could become
wired in parallel, be sure the load isn’t adding
		annoying in a control room environment. So,
up to less than 2 ohms. Anything below 2 ohms
		when the M•1400/M•1400i is not working hard,
can cause the SHORT	LED to light and trig-

ger the PROTECT mode.	the fan goes slow; when the music gets loud and
	puts the amp to work, the fan goes fast.

Remember: As the load gets	POWER
“heavier,” its value in ohms	To make the amp operate, push the top half
goes down. For instance, a
	of the POWER switch. It clicks into place and a
2-ohm speaker load is twice
	soothing green light adjacent to it glows. To
as “heavy” as a 4-ohm load.
	turn the amp off, push the lower half. It’ll click
As the internal temperature of the amplifier
	again and the green light will extinguish.
rises, the fan kicks into high speed. This occurs
	When you power up the M•1400/M•1400i,
at 60°C (140°F). More air moves through the
	a built-in delay circuit prevents any pops or
constant temperature gradient cooling tunnel
	thumps from being transmitted to the speakers
to remove additional heat from the output
	due to turn-on instability in the system. Be sure
transistors. However, if the internal tempera-

°the signal driving the amplifier is turned

ture of the amplifier should exceed 80 C

(176°F), the COLD LED turns off, the HOT			down when you first power up the system.
			There are few things as rude as 3 seconds of
LED turns on, and both PROTECT LEDs shine.
			silence followed by 250 watts of full-blast
The output of the amplifier is muted — at this
			stereo sound! (Well, maybe 225 kilowatts of
point the amplifier is in Standby mode and
			accordian music...)
remains there until the internal temperature
cools off to a safe level
°	°				CAUTION		WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT			SERIAL NUMBER	MANUFACTURING DATE
(55 C or 131 F). When							EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.
this occurs, the HOT					RISK OF ELECTRIC SHOCK		NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
					DO NOT OPEN		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
LED and PROTECT		(MONO BRIDGE)			THE FOLLOWING ARE TRADEMARKS AND REGISTERED TRADEMARKS OF MACKIE DESIGN INC.: "MACKIE", "FR SERIES", AND THE "RUNNING MAN" FIGURE
		1000 WATTS	OUTPUTS				MONO		OUTPUTS
		8 OHM LOAD			CH			CH
LEDs turn off, the		(STEREO)	SUITABLE			+	BRIDGE –		SUITABLE
		500 W / 500 W	FOR CLASS		1			2	FOR CLASS
			2 WIRING						2 WIRING
		4 OHM LOAD
COLD LED turns on					+			+
and normal operation					–			–
		120 VAC 60 Hz
resumes.
		1000 WATTS
					SPEAKER OUTPUTS
					CAUTION		WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT			SERIAL NUMBER	MANUFACTURING DATE 1
							EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.
					RISK OF ELECTRIC SHOCK		NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
					DO NOT OPEN		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
		(MONO BRIDGE)			THE FOLLOWING ARE TRADEMARKS AND REGISTERED TRADEMARKS OF MACKIE DESIGN INC.: "MACKIE", "FR SERIES", AND THE "RUNNING MAN" FIGURE
		1000 WATTS	OUTPUTS				MONO		OUTPUTS
		8 OHM LOAD	SUITABLE			+	BRIDGE –		SUITABLE
		(STEREO)
		500 W / 500 W	FOR CLASS		CH			CH	FOR CLASS
			2 WIRING						2 WIRING
		4 OHM LOAD			1			2
					+			+
					–			–
		120 VAC 60 Hz
14		1000 WATTS
					SPEAKER OUTPUTS