Atlas AA50PHD-CE Manual del usuario - Página 6

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Front Panel

1. Power Switch

This push switch (On/Off) supplies power to the mixer amplifier.

2. Power Indicator

This LED illuminates Blue when the power switch is turned On.

3. Signal Indicator

When the signal LED illuminates Green, input signals are connected to the amplifier. The Signal LED is PRE the input level controls.

4. Limiter Indicator

The AAPHD Series amplifier has an input signal peak limiter located between the preamp mixer stage and the power amplifier stage.

This input signal peak limiter is designed to prevent the amplifier from being over driven by excess input signals that may cause

damage to the amplifier. If the amplifier preamp stage senses excessive input signal, the peak limiter will engage reducing the signal

and the Limiter LED will illuminate Red. An occasional flash of the LED is OK. If ON steady state; turn the associated level control

down until the Limiter LED turns OFF . It may be necessary to reduce the signal level at the input of the amplifier.

5. Fault Indicator

This LED serves two functions:

A. PHD Test Circuit Load Fault Indicator - When testing the system using the PHD feature for proper wiring and amplifier

loading, this LED will illuminate Yellow if a fault is sensed in the audio speaker system. See "Using the PHD Load Impedance

Testing System. " Note: For 100V distributed systems only.

Excessive Current Draw Indicator - Will illuminate Yellow when the amplifier is consuming excessive current. At that

point, a current limiting circuit is activated, reducing the output power to prevent damage to the amplifier. The most likely

cause for the fault is an incorrect load impedance connected to the amplifier. The LED should not come on if a proper load is

applied. If the Fault LED is illuminating, use the PHD Load Impedance test explained in the manual to help troubleshoot the

cause of the problem. Note: An occasional LED flash is okay. When LED is ON audible distortion may be heard at the speakers.

6. PHD Switch

The AAPHD Series features a patent pending Amplifier Diagnostic System. The PHD (Push Here Diagnostic) is simple to use and very

effective in testing the speaker wiring and load impedances on 100V speaker systems to assure the proper load is applied to the

amplifier. Please read the section on "Using the PHD Feature" before activating the circuit. To activate the PHD circuit a small tool with

a point will be required to access the momentary switch through the hole on the front panel. See "Using the PHD Mixer Amplifier Load

Impedance Testing System. "

AtlasSound.com

AA50PHD-CE

50W Mixer Amplifier

1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.

Telephone: 800.876.3333 • Fax: 800.765.3435

Specifications are subject to change without notice.

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Owner's Manual