amplifier. For a temporary adjustment when a signal generator and voltmeter are not available, use an FM tuner and tune it to an unused station as your signal source, and connect the output to the amplifier as described above. Connect the amplifier output to a small full range speaker. Turn the amplifier level controls full down and turn the amplifier on. Turn up the level control until you hear a signal through the speaker. Alternate adjusting R8 and the input control until you have the level control full. There should be a very low output from the amplifier if any is detected at all.

MODULE REPLACEMENT

WARNING: Only a competent technician should attempt the following procedure.

The amplifier modules have been designed to eliminate the need for a special work place if a field exchange becomes necessary. All wire connections are made by quick connect terminals. The following tools are needed:

Allen wrench, long reach 9/64

Allen wrench, long reach 7/64

Phillips screwdriver #1 tip

Thin nose pliers

Remove the Phillips head screws located on the rear panel, which secure the input jacks. Remove the two 9/64 Allen screws located between the heatsink fins along the top edge on each side, which fasten the cover. Three more screws hold the heatsink to the chassis; remove these screws and the level control knob. Unplug the gray cable which connects the mono input signal to Channel 2. Tilt the rear of the heatsink up and disengage the assembly from the chassis. Pull the heatsink away from the chassis to extend the wires. Disconnect the output wires from the binding posts and the power wires from the module. Remove the module from the heatsink.

Install the new module on the heatsink. If it is Channel 1, set the Ground and Mono switches to the left (looking from the rear of the module) and reattach the gray mono cable. To reduce the chance of assembly errors in high stress situations, the main AC terminals are sized to accommodate only the correct wires. Reconnect the wires to the terminals as follows:

Wire Color

Function

Terminal/Size

 

 

 

Red

Output

Red Binding Post, 1/4"

 

 

 

Black

Output Ground

Black Binding Post, 1/4"

 

 

 

Orange (two)

High Voltage AC

AC1, AC2, 1/4"

White/Orange

High Voltage Center Tap

CT1, 1/4"

Blue (two)

Low Voltage AC

AC3, AC4, 1/8"

 

 

 

White/Blue

Low Voltage Center Tap

CT2, 1/8"

 

 

 

– 16 –

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Hafler P3000, P1500 manual Module Replacement, Wire Color Function Terminal/Size
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P3000, P1500 specifications

The Hafler P1500 and P3000 are notable power amplifiers that have earned recognition for their performance and reliability in various audio applications. Both models are designed to deliver high-quality sound reproduction while offering users an array of advanced features that enhance their usability in professional and home audio setups.

The Hafler P1500 is a two-channel power amplifier that boasts a robust output of 150 watts per channel at 8 ohms, making it suitable for driving a variety of speakers with ease. One of its standout features is the intelligent cooling system, which ensures the amplifier operates at optimal temperatures, minimizing the risk of thermal overload. Furthermore, the P1500 is equipped with a high-quality toroidal transformer, which helps to reduce distortion while providing stable power, contributing to the amplifier's overall clarity and dynamic range.

In addition to its power capabilities, the P1500 includes features such as a variable speed fan and comprehensive protection circuitry to safeguard the amplifier from overcurrent and overheating. The user-friendly design includes both XLR and RCA inputs, allowing for versatile connectivity options with professional audio equipment and consumer audio devices alike. The rugged construction of the chassis is designed to withstand the rigors of touring and studio environments, ensuring durability and reliability.

On the other hand, the Hafler P3000 elevates the performance level with a powerful output of 300 watts per channel at 8 ohms. This amplifier is particularly favored in larger audio setups where significant power is required. It utilizes similar advanced technology as the P1500, including sophisticated thermal management systems and high-performance circuitry aimed at keeping distortion levels to a minimum.

The P3000 is recognized for its exceptional headroom and dynamic capability, making it an ideal choice for driving large speaker systems in professional settings such as recording studios and live events. The amplifier features balanced XLR connectors for professional applications, and its dual-level LED indicators provide real-time feedback on performance, giving users essential information on levels and operation status.

Both the Hafler P1500 and P3000 are exemplary models that blend innovative design with high-quality sound performance. Their reputation in the audio community stems from their ability to deliver powerful performance, reliability, and flexibility, catering to a multitude of audio environments from home theater systems to professional sound reinforcement setups. Their enduring popularity reflects Hafler’s commitment to engineering excellence, allowing audio enthusiasts to experience superior sound without compromise.
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