This document is a service manual for the Wharfedale Hi-Fi Loudspeaker, specifically models PC10+DX Surround. It provides detailed information for servicing and maintaining these loudspeaker systems.
The primary function of the device is to act as a Hi-Fi loudspeaker, likely for surround sound applications given the "Surround" designation in the model name. It is an active loudspeaker, as indicated by the presence of an internal amplifier and various electronic components detailed in the schematic and parts lists.
Important Technical Specifications:
- Amplifier Power: 100 watts. This indicates the continuous power output of the internal amplifier.
- Input Sensitivity: 250mV. This specifies the voltage level required at the input to achieve the rated output power.
- Crossover Range: 35-85Hz. This range suggests that the loudspeaker is designed to handle low frequencies and likely integrates with other speakers (e.g., satellite speakers) in a surround sound system, with its crossover point adjustable within this range.
- Frequency Response: 30-95Hz. This defines the range of audio frequencies the loudspeaker is designed to reproduce effectively. The low upper limit confirms its role as a subwoofer or a dedicated low-frequency effects (LFE) speaker.
- LF Response (Fb): 45Hz. This is likely the -3dB point or tuning frequency of the bass reflex system, indicating its low-frequency extension capability.
- Maximum SPL (ref 1m): 108dB. This is the maximum sound pressure level the speaker can produce at a distance of 1 meter, indicating its potential loudness.
- Weight: 14.62 Kg. This suggests a substantial and robust build, typical for a dedicated subwoofer.
- Dimensions Overall (HWD): 385335360 (mm). These are the physical dimensions of the loudspeaker enclosure.
Usage Features:
The schematic diagram and parts list reveal several features related to the usage and control of the loudspeaker:
- Phase Switch (SW200): This allows users to adjust the phase of the subwoofer's output relative to other speakers in the system, helping to optimize bass integration and avoid cancellation issues.
- Auto Sense (SW201): This feature likely enables the loudspeaker to automatically power on when an audio signal is detected and power off after a period of inactivity, contributing to energy efficiency and convenience.
- Volume Control (VR200): A potentiometer for adjusting the output volume of the subwoofer, allowing users to balance its level with other speakers.
- Input/Output Connections: The presence of various jacks (CON200, CON201, CON202, CON100, CON101, CON102, CON103, CON104) indicates multiple input options, possibly including line-level inputs for connection to an AV receiver or processor. The "SIGNAL GND," "15V," and "AT-ON/OFF" connections suggest potential control or power integration with other components.
- Power LED and Auto-LED: These indicators provide visual feedback on the operational status of the loudspeaker, such as whether it is powered on or in auto-sense mode.
- Fuse Protection (F100, F101, REX1, REX2): Multiple fuses are present for electrical protection, safeguarding the internal circuitry from overcurrents. The configuration table for fuses indicates different ratings for PC10+ and PC12+ models, and also for 115V and 230V mains operation, highlighting international compatibility.
- Transformer: The presence of a transformer (022-1076902096) confirms an internal power supply, converting mains voltage to the required internal voltages for the amplifier and control circuitry.
- Woofer (ZD-22800-01): The core sound-producing component, designed for low-frequency reproduction.
- Cabinet (344-2105303001): The enclosure designed to house the components and optimize acoustic performance.
- Plastic Feet (226-0500218511): For stable placement and isolation from the floor.
Maintenance Features:
The service manual itself is a key maintenance feature, providing essential information for technicians:
- Schematic Diagram: A detailed circuit diagram (C-293A05. SCH-1) showing all electronic components and their interconnections. This is crucial for troubleshooting, diagnosing faults, and understanding the device's operation.
- Assembly Part List: A comprehensive list of mechanical and structural components, including the carton box, bubble corners, bubble cushion, cabinet, woofer, amplifier module, plastic feet, cube, plastic panel, logo plate, knob, and various screws. This list is vital for ordering replacement parts for physical damage or wear.
- Electronics Parts List: A detailed inventory of all electronic components, including resistors, capacitors, diodes, ICs (e.g., TL072 op-amps), potentiometers, switches, jacks, fuses, relays, LEDs, and transistors (e.g., 2SC4381Y, 2SD1047, 2SA1667Y, 2N5551). Each entry includes the part number, description, quantity, and location (e.g., R205, C200). This list is indispensable for component-level repair and replacement.
- Safety Notes: The manual explicitly states important safety precautions for servicing, emphasizing the need to unplug the product, refer servicing to qualified personnel, use manufacturer-specified replacement parts (or those with identical characteristics), and perform safety checks after repairs. This ensures the safety of both the technician and the end-user.
- PCB Boards: The manual lists specific PCB boards (INPUT PCB, PCB BOARD, AMP PCB) which are modular components, potentially simplifying replacement of entire sections if a complex fault occurs.
In summary, the Wharfedale PC10+DX Surround loudspeaker is a powerful, active low-frequency speaker designed for Hi-Fi surround sound systems, offering user controls for phase and volume, and convenience features like auto-sense. The service manual provides comprehensive technical details and parts lists, making it a critical resource for professional maintenance and repair, ensuring the longevity and safe operation of the device.
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