Wharfedale Pro EVP-X15P

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Summary

Amplifier Electronic Parts List

Summary

Amplifier Electronic Parts List

Overview

This document serves as a comprehensive service manual for the Wharfedale Pro EVP-X15P Professional Speaker Enclosures, providing detailed information essential for understanding, operating, and maintaining the device. It is structured to guide technicians and users through the various aspects of the speaker system, from its core functionality to intricate repair procedures.

The primary function of the EVP-X15P is to deliver high-quality audio reproduction in professional settings. As a powered speaker enclosure, it integrates an amplifier directly into the speaker cabinet, eliminating the need for external power amplifiers and simplifying setup. This design makes it suitable for a wide range of applications, including live sound reinforcement, DJ setups, public address systems, and fixed installations in venues such as clubs, theaters, and houses of worship. The speaker is designed to handle a broad frequency range, ensuring clear and impactful sound across different audio content, from speech to music. Its robust construction is intended to withstand the rigors of professional use, offering reliability and consistent performance.

Key usage features of the EVP-X15P include its versatile input options and integrated sound processing capabilities. The speaker offers multiple input types, accommodating various audio sources. It includes switchable balanced microphone or line-level inputs, allowing direct connection of microphones or line-level devices like mixers and instruments. Additionally, it features a dedicated line-level input and RCA inputs, further expanding its compatibility with different audio equipment. The inclusion of both combined jack and XLR connectors, as well as RCA sockets, provides flexibility in cabling. The speaker's input sensitivity can be adjusted for different signal levels, ensuring optimal gain staging and preventing distortion. An integrated line output, featuring a balanced male XLR connector, allows for easy daisy-chaining of multiple speakers or sending the audio signal to other sound reinforcement equipment. The main EQ section offers high-frequency and low-frequency shelving controls, enabling users to tailor the speaker's sound output to the acoustic characteristics of the environment or to suit specific audio preferences. This allows for fine-tuning the bass and treble response, which is crucial for achieving balanced sound in diverse settings. The amplifier section provides substantial continuous and peak power, ensuring sufficient headroom for dynamic audio content and robust performance even at high volumes. Protection circuitry, including dynamic AGC (Automatic Gain Control), is incorporated to safeguard the amplifier and speaker components from overload and damage, enhancing the longevity and reliability of the system. Visual indicators, such as a power-on LED and a system dynamic AGC activity LED, provide immediate feedback on the speaker's operational status and protection engagement. The enclosure itself is designed for portability and durability, featuring handles for easy transport and a stand-mount option for flexible placement. Its dimensions and weight are optimized for professional use, balancing acoustic performance with practical considerations for setup and breakdown.

Maintenance features for the EVP-X15P are primarily focused on component replacement and circuit-level repairs, as detailed in the provided schematic diagrams and parts lists. The service manual includes a comprehensive schematic diagram that illustrates the internal electronic circuitry of the speaker, including the crossover network and amplifier section. This diagram is invaluable for diagnosing issues at the component level. For instance, the schematic clearly labels capacitors (C1, C2, C3), resistors (R2, R3, R4), and inductors (L1, L2) within the crossover, along with their specific values and power ratings. This level of detail allows technicians to identify faulty components and replace them with exact matches, ensuring the speaker's original acoustic and electrical characteristics are maintained. The assembly parts list provides a breakdown of all mechanical components, such as the logo plate, steel grille, screws, woofer, plastic tube, plastic horn, tweeter, cabinet, handles, rubber feet, and support holder. Each part is assigned a unique R/N (Reference Number) and P/N (Part Number), along with a description and quantity, facilitating accurate ordering and replacement of physical components. Similarly, the electronic parts list details all electrical components, including PCB plates, LEDs, lamps, capacitors, resistors, inductors, ICs, potentiometers, jacks, switches, diodes, Zener diodes, transformers, and transistors. This list is crucial for troubleshooting and repair, as it specifies the exact part numbers, descriptions, and quantities of each electronic component. For the amplifier section, separate assembly and electronic parts lists are provided, offering an even more granular view of the internal components of the powered module. This includes items like the AL panel, radiator, copper posts, grille, various screws, and a wide array of electronic components specific to the amplifier circuit. The manual explicitly states that "Adjacent to the relevant component densifying component shall be replaced only by the component specified in the circuit for safety reasons." This emphasizes the importance of using original or equivalent specified parts to ensure safety and performance. Furthermore, it advises that "Note: Damage requiring service unplug this product form the wall outlet and refer servicing to qualified service personnel. When replacement parts are required, be sure the service technician has used replacement parts specified by the manufacturer or have the same characteristics as the original parts. Unauthorized substitutions may result in fire, electric shock, or other hazards. Upon completion of any service or repairs, the product, ask the service technician to perform safety checks to determine that the product is in proper operating condition." This highlights critical safety precautions and the necessity of professional service for repairs, ensuring both user safety and the continued optimal functioning of the speaker system. The detailed diagrams and lists empower qualified technicians to perform precise repairs, extending the lifespan of the EVP-X15P enclosures.