Wharfedale Pro PM-600

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Summary

4.Schematic Diagrams

Channel 1-5 Schematic

Detailed schematic for audio channels 1 through 5.

Input;Output Connections

Schematic details for tape input/output and main/record outputs.

Effects and Return Paths

Schematic representation of effects loop and return connections.

Power Supply and Control

Schematic for the power supply and control circuitry.

Standby Power Circuit

Schematic detailing the standby power control section.

Summary

4.Schematic Diagrams

Channel 1-5 Schematic

Detailed schematic for audio channels 1 through 5.

Input;Output Connections

Schematic details for tape input/output and main/record outputs.

Effects and Return Paths

Schematic representation of effects loop and return connections.

Power Supply and Control

Schematic for the power supply and control circuitry.

Standby Power Circuit

Schematic detailing the standby power control section.

The Wharfedale Pro PM-600 is a professional audio mixer designed for a variety of sound reinforcement applications. This service manual provides comprehensive information for understanding, operating, and maintaining the device.

Function Description

The PM-600 functions as a central hub for mixing multiple audio input signals, processing them, and routing them to various outputs. It is equipped with both balanced microphone and line-level inputs, allowing for connection of a wide range of audio sources, from microphones to instruments and playback devices. The mixer features individual channel equalization (EQ) for precise tone shaping, a master EQ section for overall sound control, and a built-in digital effects processor to add depth and ambiance to the audio. Its primary role is to provide a versatile and reliable solution for live sound, studio recording, and other professional audio environments where signal mixing and control are essential.

Important Technical Specifications

The PM-600 boasts a robust set of specifications that highlight its performance capabilities:

Inputs:

Balanced Mic Inputs: 5 channels, providing clean signal reception for microphones.
Line Channels: 6 channels, accommodating various line-level sources.
Input Impedance:
- Low Z (Balanced): 2 kOhms, suitable for low-impedance microphones.
- Line: 16 kOhms, optimized for line-level devices.
Maximum Input Level:
- Low Z (Mic): 0 dB, indicating its tolerance for strong microphone signals.
- Line: 20 dB, allowing for high-level line inputs without distortion.

Outputs:

Main Out: Unbalanced TRS, providing the primary mixed output.
Maximum Output Level:
- Main: 18 dBv, capable of driving power amplifiers effectively.
- Record Out: 5 dBv, suitable for connecting to recording devices.

Frequency Response:

A broad range from 20 Hz to 25 kHz, ensuring full audio spectrum reproduction.

Gain:

Maximum Channel Gain:
- Low Z (Balanced): 40 dB, offering significant amplification for quiet sources.
- Line: 20 dB, providing ample gain for line-level signals.

Equalization:

Channel Equalization:
- Low EQ: 100 Hz ±12 dB, for bass frequency adjustment.
- High EQ: 8 kHz ±12 dB, for treble frequency adjustment.
Master EQ:
- Hi EQ: 12 kHz 12 dB, for overall high-frequency control.
- Mid EQ: 1 kHz 12 dB, for overall mid-frequency control.
- Low EQ: 80 Hz 12 dB, for overall low-frequency control.

Performance:

THD (Total Harmonic Distortion): Less than 0.1%, indicating very low signal distortion and high fidelity.
Built-in Digital Effect: Yes, enhancing sound with integrated effects.
Protection: Thermal/Load, safeguarding the unit from overheating and excessive load conditions.

Power and Physical:

Power Consumption: 230 Watts.
Power Requirements: 330 Watts.
Weight: 11.48 kg/PCS, making it relatively portable for its class.
Dimensions (HWD): 475241188 mm, a compact footprint for its capabilities.

Usage Features

The PM-600 is designed for intuitive operation and flexible application. Its multiple input channels, coupled with individual gain and EQ controls, allow users to precisely tailor the sound of each source before mixing. The master EQ provides a final layer of tonal adjustment for the overall mix, ensuring the output is optimized for the listening environment. The integrated digital effects processor offers creative possibilities, enabling users to add reverb, delay, or other effects to individual channels or the master mix, enhancing the sonic experience. The presence of a record out allows for easy integration with recording setups, making it suitable for capturing live performances or studio sessions. The robust construction and thermal/load protection ensure reliable operation even under demanding conditions, making it a dependable tool for professional use.

Maintenance Features

The service manual provides detailed information crucial for the maintenance and repair of the PM-600. Key maintenance features include:

Assembly Part List: This list details all mechanical components, such as the main frame, cabinet, knobs, handles, and rubber feet, along with their part numbers and quantities. This is essential for identifying and ordering replacement physical parts.
Electronic Parts List: This comprehensive list includes all electronic components, such as integrated circuits (ICs), potentiometers, radiators, switches, audions (transistors), transformers, fuses, and electric fans. Each component is listed with its part number, description, and quantity, which is vital for troubleshooting and replacing faulty electronic parts.
Schematic Diagrams: The manual includes detailed schematic diagrams for the main PCB, amplifier PCB, and input PCB. These diagrams are indispensable for understanding the circuit layout, signal flow, and interconnections of all electronic components. They enable technicians to diagnose issues at a component level, trace signals, and perform accurate repairs.
Safety Guidelines for Component Replacement: The manual explicitly states that "Adjacent to the relevant component denoting specific component shall be replaced only by the component specified in the circuit for safety reasons." It further warns that "Damage requiring service, unplug this product form the wall outlet and refer servicing to qualified service personnel. When replacement part are required, be sure the service technician has used replacement parts specified by the manufacturer or have the same characteristics substitutions may result in fire, electric shock, or other hazards.Upon completion of any service or repairs this product, ask the service technician to perform as the original parts. Unautorized safety checks to determine that the product is in proper operating condition." These guidelines emphasize the importance of using original or manufacturer-approved parts and highlight the safety risks associated with unauthorized repairs or incorrect component substitutions. This ensures that maintenance is performed safely and effectively, preserving the integrity and performance of the mixer.

Overall, the Wharfedale Pro PM-600 is a versatile and robust professional audio mixer, supported by a comprehensive service manual that facilitates its long-term usability and maintainability.