Samson S1500 Owner's Manual

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Contents

Samson S1500 Owner's Manual Manual pdf 8 page image

6The S1500 / S2000 Protection CircuitryAs noted in the “Guided Tour” section of this manual, the S1500 / S2000 front-panel Protection LED indicates the activity of the relay speaker connectioncircuitry. When the Protection LED is lit, this circuitry is active, and all connectedspeakers are muted (provided with 0 volts DC), thus protecting them andpreventing any audible “thump” from occurring.The following conditions will cause the Protection LED to go on:• Initial power-up: For approximately five seconds after initial power-up, theprotection circuitry is activated and the speaker output is muted. If everything isoperating normally, you will hear an audible click at the conclusion of this briefperiod, as the protection circuitry is deactivated and the S1500 / S2000 beginsdelivering signal to connected speakers (at which point you’ll hear a click). It isnormal for the Protection LED to fade gradually after the amplifier is powered off.• Overheating: A temperature sensing device in the S1500 / S2000 will causethe protection circuitry to be activated (and the Protection LED to go on)whenever the operating temperature of the unit rises above a safe level. Toguard against this problem, make sure the S1500 / S2000 receives adequateventilation on all sides and that both the front and rear panels are unobstructed.• Severe overcurrent conditions: This occurs whenever the signal being input tothe S1500 / S2000 rises to a level above 20% THD (Total Harmonic Distortion).• Shorted speaker cables: This will occur if, due to faulty wiring, the hot andground signals being output by the S1500 / S2000 short one another.• Output impedance drops below 2 ohms: This can occur if the S1500 / S2000is connected to inappropriate speaker systems (see the “Setting Up and UsingYour S1500 / S2000” section on page 5 in this manual for more information).• DC voltage detected at speaker output: The most likely cause of this is aninternal failure.In general, any time the Protection LED lights up (other than during theapproximately five seconds following initial power-up), there is reason to beconcerned. If this occurs, turn the S1500 / S2000 off immediately and carefullycheck all wiring and external devices in order to locate and correct the conditionthat caused the LED to light up in the first place.For further assistance, contact your local Samson dealer. If purchased in theUnited States, you can call Samson Technical Support (1-800-372-6766)between 9 AM and 5 PM EST.WARNING: If the Protection LED fails to go out (and you fail to hear theaccompanying audible click) approximately five seconds after power-up,turn the S1500 / S2000 off immediately and check all external devices andwiring for possible shorts or other defects.PROTECTION