User manual CARVIN DCM4000

[. . . ] This symbol is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. LIMITED WARRANTY Your Carvin amplifier is guaranteed against failure for 3 YEARS unless otherwise stated. Carvin will service and supply all parts at no charge to the customer providing the unit is under warranty. Shipping costs are the responsibility of the customer. CARVIN DOES NOT PAY FOR PARTS OR SERVICING OTHER THAN OUR OWN. [. . . ] POWER SWITCH Check the power amp connections and verify the AC line power source before engaging the POWER switch. The yellow LED unmistakably indicates that all circuits are properly powered up. Yellow is used so the operator can see the red indicators (clipping or protect) from a distance. CHANNEL LEVEL CONTROL Precision input LEVEL attenuators are used to adjust the volume levels. To deliver the amps maximum power without reducing the headroom of the signal source, the level controls should be turned full on. CHANNEL SIGNAL INDICATOR The green SIGNAL LED indicators will start to flash when there is a signal passing to your speakers (-30dBM). CHANNEL CLIP INDICATOR The red CLIP LED indicators will start to flash when each channel has reached its maximum output. Occasional flashing caused by lower bass frequencies is OK. However, consistent flashing caused from higher frequencies may damage high frequency drivers (excessive distortion). BRIDGE MODE INDICATOR This yellow LED will indicate when the rear "bridged" switch has been engaged and you're running a pair af channels in the "bridge" mode. POWER INDICATOR/FUSES This Yellow LED will indicate power to each pair of amps. If one pair does not come on, remove the top lid and replace both 25 AMP 250 Volt slow blow MBA fuses located in the center bottom of the amp. FRONT COOLING VENTS/FAN Upon rack installation, the rear of the amp must be fully exposed to room temperature air. The surrounding air should not be warmer than 120° or the thermal protection will engage. The front cooling vents are not to be restricted from exhausting the warm air. PROTECT LED INDICATOR The red PROTECT LED provides the operator with information about the status of the amplifier. The PROTECT LED can come on under 3 different conditions (when this happens both channels are muted) 1) During power-up, the amplifier stays in a muted state for approx. 3 sec until it determines that everything is functioning normally (no output shorts or over temp conditions). 2) When the output load draws excessive current or a direct short is detected in a speaker cable or speaker system, reset this condition by turning the amp off for two seconds and then on again. Check for shorted cables and proper impedance (2 ohms minimum per ch or 4 ohms BRIDGED). 3) Overheating is usually determined when the amp stops in the middle of a performance and the PROTECT LED comes on. If this is the case, leave the amp on for the fan to cool the amp down. [. . . ] The INPUT and LEVEL is handled by channel 1 and 3. The minimum speaker impedance is 4 ohms. CAUTION: The power developed by bridging your amp can destroy most speaker systems! 17. BRIDGE MODE--25V/70V DISTRIBUTION SYSTEMS 18. [. . . ]