Boss Audio Systems GT780 service manual

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To engineers in charge of repair or inspection of our products.

Before repair or inspection, make sure to follow the instructions so that customers and Engineers in charge of repair or inspection can avoid suffering any risk or injury.

1. Use specified parts.

The system uses parts with special safety features against fire and voltage. Use only parts with equivalent characteristics when replacing them. The use of unspecified parts shall be regarded as remodeling for which we shall not be liable. The onus of product liability (PL) shall not be our responsibility in cases where an accident or failure is as a result of unspecified parts being used.

2. Place the parts and wiring back in their original positions after replacement or re-wiring. For proper circuit construction, use of insulation tubes, bonding, gaps to PCB, etc, is involved. The wiring connection and routing to the PWB are specially planned using clamps to keep away from heated and high voltage parts. Ensure that they are placed back in their original positions after repair or inspection. If extended damage is caused due to negligence during repair, the legal responsibility shall be with the repairing company.

3.Check for safety after repair. Check that the screws, parts and wires are put back securely in their original position after repair. Ensure for safety reasons there is no possibility of secondary ploblems around the repaired spots. If extended damage is caused due to negligence of repair, the legal responsibility shall be with the repairing company.

4.Caution in removal and making wiring connection to the parts for the automobile. Disconnect the battery terminal after turning the ignition key off. If wrong wiring connections are made with the battery connected, a short circuit and/or fire may occur. If extensive damage is caused due to negligence of repair, the legal responsibility shall be with the repairing company.

5.Cautions regarding chips.

Do not reuse removed chips even when no abnormality is observed in their appearance. Always replace them with new ones. (The chip parts include resistors, capacitors, diodes, transistors, etc). The negative pole of tantalum capacitors is highly susceptible to heat, so use special care when replacing them and check the operation afterwards.

6. Cautions in handling flexible PCB

Before working with a soldering iron, make sure that the iron tip temperature is around 270... Take care not to apply the iron tip repeatedly(more than three times) to the same patterns. Also take care not to apply the tip with force.

7.Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power to the unit.

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Contents Model GT780 Page Exploded View Printed Circuit Board Circuit Diagram Circuit Diagram Parts List Parts List Parts List

GT780 specifications

The Boss Audio Systems GT780 is a standout product in the world of car amplifiers, designed to cater to audiophiles seeking power, clarity, and enhanced sound quality for their vehicles. With its robust construction and innovative features, the GT780 offers an impressive blend of technology and user-friendly operation.

At the heart of the GT780 lies a powerful 780-watt maximum output, ensuring that audio enthusiasts experience an engaging and dynamic sound stage within their car. The amplifier boasts a Class A/B design, which is known for its efficiency and sound quality. This technology allows for less distortion at moderate levels, providing a cleaner audio signal and more faithful reproduction of music.

The system is equipped with adjustable bass and treble controls, enabling users to fine-tune their listening experience according to personal preferences. Whether you prefer deep bass thumps or crystal-clear highs, the GT780 delivers versatility that accommodates various music genres and listening styles.

Furthermore, the Boss Audio GT780 includes a low-pass filter, which allows users to set a cutoff frequency that ensures only desired frequencies are sent to their subwoofers. This feature enhances the overall system performance by preventing distortion and ensuring that the bass output remains tight and punchy.

The amplifier also includes RCA inputs, facilitating easy connections with head units, and comes with a built-in MOSFET power supply. MOSFET technology enhances the amplifier’s performance by improving the speed and efficiency of the power delivery, making it capable of handling high power demands without overheating.

In terms of design, the GT780 features a compact chassis that can fit easily into various vehicle types without taking up excessive space. The sleek and stylish finish adds a touch of sophistication, making it an attractive addition to any car audio setup.

Lastly, the Boss Audio Systems GT780 is built with durability in mind. It has a sturdy and reliable construction designed to withstand the rigors of installation and use in different automotive environments. This amplifier is an excellent choice for anyone looking to elevate their in-car audio experience, combining performance, quality, and affordability seamlessly.