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 partially 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.

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 amplifier 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 amplifier 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” described 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.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT

SERIAL NUMBER

MANUFACTURING DATE

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 • PATENTS PENDING • COPYRIGHT ©1998

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

120 VAC 60 Hz

2000 WATTS

 

1300 WATTS / CH

 

2600 WATTS

 

2 OHM LOAD MIN.

 

4 OHM LOAD MIN.

CH

 

MONO

CH

MONO

+

BRIDGE

1

–

2

BRIDGE

 

 

 

 

+

 

+

 

 

–

 

–

 

PIN 1+ CH1+

 

 

PIN 1+ CH2+

PIN1+ BRIDGE+

PIN 1– CH1–

 

 

PIN 1– CH2–

PIN1– BRIDGE –

PIN 2+ & 2– NOT USED

 

 

PIN 2+ & 2– NOT USED

PIN 2+ & 2– NOT USED

SPEAKER OUTPUTS

CAUTION

LETHAL VOLTAGES MAY APPEAR AT OUTPUT

TERMINALS. CLASS 1 WIRING IS REQUIRED

20