Temp Status - Mackie M-2600 Owner's Manual

Note: When using the amplifier in
BRIDGED mode, both SHORT LEDs will light
under shorted or low impedance conditions.
This is an indication of a problem that requires
further investigation.

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•2600 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 amplifier
hard into low impedance loads, frayed or par-
tially shorted speaker cables, or defective or
internally shorted speakers.
The heaviest load the M•2600 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.
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.
120 VAC 60 Hz
2000 WATTS
20
Please see "Do The Math: Ohms, Loads and
Such" in Appendix D to learn about speaker
loads.
As the internal temperature of the amplifier
rises, the fan speed gradually increases. More
air moves through the constant temperature
gradient cooling tunnel to remove additional
heat from the output transistors. However, if
the internal temperature of one of the ampli-
fier channels should exceed 90°C (194°F), the
COLD LED turns off, the HOT LED turns on,
and its PROTECT LED shines. The output of
the amplifier is muted — at this point the am-
plifier is in Standby mode and remains there
until the internal temperature cools off to a
safe level (52°C or 125°F). When this occurs,
the HOT LED and PROTECT LEDs turn off,
the COLD LED turns on and normal operation
resumes.
In the rare event that the transformer gets
too hot, the amplifier will shut down. It will not
come back on until the transformer has cooled
sufficiently, which can take an hour or so.
Be Aware: If the HOT LED
comes on frequently or the
transformer ever thermals
out, something is over-
working the M•2600 or it's
not properly ventilated.
Look at each of the "extreme conditions" de-
scribed on this page and try to determine what
is causing the amplifier to overheat. Refer to
"Thermal Considerations" on page 29 and
"Troubleshooting" on page 32.
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
1300 WATTS / CH
2 OHM LOAD MIN.
2600 WATTS
4 OHM LOAD MIN.