Unika PA-664 User Instructions

Contents

Unika PA-664 User Instructions Manual pdf 10 page image

page 9PROTECTION1. SWITCH ON MUTE PROTECTION - The mute circuit is used at the inputs when the unit switched ON, output of between a few seconds the amplifier willbe muted. This is done so that turn-on/off noises from mixers and other gear is blocked in case the entire system is powered up at once.2. SHORT CIRCUIT PROTECTION - The PA series comes with built-in Output Short Circuit Protects. The Output ShortCircuit Protection protects the output devices of the amplifier from short circuits and stressful loads. If your speaker linesshorted, the amplifier automatically detects this problem and discontinued operation for that channel. If one side of youramplifier becomes shorted and goes into protect mode, the other side will continue to operate normally. Channel output duringthe “Short Circuit Protection" will be interrupted (i.e. no sound output). Short Circuit Protection can usually be traced back to thesignal output line (i.e. speaker line). Check the line from the output terminal of the amplifier to the speaker. If this line is good,check the internal speaker connections and components. A short circuit will usually be traced to a bad cable or a bad speakercomponent and is rarely traced to the amplifier itself.UNiKA PA-664/PA-18043. OVERHEATING PROTECTION - The PA series amplifiers are cooled by two variable speed fans, and always are kept at moderate temperature. Duringlow level output the fans run at normal speeds. During high output and as heat raises, (exceeding 50°C.), the fans will run at higher speeds to aid the coolingprocess. If the heatsink temperature exceeds 91°C., the amplifier will mute until the amplifier cools down. When the amplifier cools below 90°C., the amplifier willreturn to normal operations. Be sure not to operate your amplifier below the minimum load ratings to reduce the risk of overheating problems.4. DC CIRCUIT PROTECTION - If dangerous subsonic frequencies or direct current (DC) is detected in the amplifier's output, the unit will activate its DC/low-frequency protection circuitry and the amplifier will be muted. This protects the loads and prevents oscillations. The unit will resume normal operation while theamplifier no longer detects dangerous low-frequency or DC output.Important Precautions Introduction Front Panel Rear Panel Set Up Operating Modes SpecificationsProtection

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