Temp status, Power, Protect – MACKIE M1400/M1400i User Manual

Page 14: Short

SPEAKER OUTPUTS

120 VAC 60 Hz

1000 WATTS

CONCEIVED AND DESIGNED BY MACKIE DESIGNS INC • WOODINVILLE • WA

THE FOLLOWING ARE TRADEMARKS AND REGISTERED TRADEMARKS OF MACKIE DESIGN INC.: "MACKIE", "FR SERIES", AND THE "RUNNING MAN" FIGURE

MANUFACTURING DATE

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

C A U T I O N

SERIAL NUMBER

(MONO BRIDGE)

1000 WATTS

8 OHM LOAD

(STEREO)

500 W / 500 W

4 OHM LOAD

OUTPUTS
SUITABLE

FOR CLASS

2 WIRING

OUTPUTS
SUITABLE

FOR CLASS

2 WIRING

–

MONO
BRIDGE

–

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 venti-
lation, high ambient temperatures, overdriving
the amplifier into clipping, driving the ampli-
fier 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 trig-

ger the

PROTECT mode.

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 tempera-
ture 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
cools off to a safe level
(55

°C or 131°F). When

this occurs, the

HOT

LED and

PROTECT

LEDs turn off, the
COLD LED turns on
and normal operation
resumes.

Be Aware: If the

HOT LED

comes on frequently, some-
thing 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 Consid-
erations” 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 actu-
ally 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.

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...)

SPEAKER OUTPUTS

–

120 VAC 60 Hz

1000 WATTS

CONCEIVED AND DESIGNED BY MACKIE DESIGNS INC • WOODINVILLE • WA

THE FOLLOWING ARE TRADEMARKS AND REGISTERED TRADEMARKS OF MACKIE DESIGN INC.: "MACKIE", "FR SERIES", AND THE "RUNNING MAN" FIGURE

MANUFACTURING DATE

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

C A U T I O N

SERIAL NUMBER

MONO
BRIDGE

(MONO BRIDGE)

1000 WATTS

8 OHM LOAD

(STEREO)

500 W / 500 W

4 OHM LOAD

OUTPUTS
SUITABLE

FOR CLASS

2 WIRING

OUTPUTS
SUITABLE

FOR CLASS

2 WIRING