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The provided manual describes the Sherwood AM-9080/B 5-CH Power Amplifier, a high-fidelity audio component designed for multi-channel sound reproduction.
The AM-9080/B is a 5-channel power amplifier, meaning it is capable of driving five separate loudspeakers. It is designed to amplify audio signals from a pre-amplifier or other source components, delivering robust and clean power to speakers for an immersive listening experience. The amplifier incorporates "TOTALLY DISCRETE AMPLIFIER STAGE (TDAS)" technology, suggesting a design philosophy focused on using individual components for superior audio performance rather than integrated circuits in the amplification path. It features a "PROTECTION" circuit (PCB3) to safeguard the amplifier and connected speakers from potential damage due to faults like DC offset or short circuits. The "DIGI-LINK" interface (PCB2-2) suggests potential integration with other Sherwood digital components, allowing for synchronized operation or control.
The AM-9080/B boasts impressive power output and audio performance characteristics:
Power Output:
Dynamic Power:
Audio Performance:
General Specifications:
The amplifier features a straightforward front panel with a "POWER" button and a "STANDBY" indicator. The internal block diagram shows inputs for "INPUT_F/L_CH," "INPUT_S/L_CH," "INPUT_CEN_CH," "INPUT_S/R_CH," and "INPUT_F/R_CH," corresponding to Front Left, Surround Left, Center, Surround Right, and Front Right channels, respectively. Outputs are provided for "SPKOUT_F/L," "SPKOUT_S/L," "SPKOUT_CEN," "SPKOUT_S/R," and "SPKOUT_F/R." Speaker relays are integrated into each channel's output path, likely for protection and soft-start functionality. The presence of "MUTE" and "PROTECTION" signals in the block diagram indicates user-facing or internal status indicators. The "DIGI-LINK" connection allows for integration with other compatible Sherwood components.
The manual includes a "Troubleshooting" section to assist users in diagnosing and resolving common issues before seeking professional repair. This section covers problems such as:
Safety Precautions are prominently featured, emphasizing the importance of using specified replacement parts for electrical and mechanical components with special safety characteristics. It also outlines a detailed AC leakage current check to be performed after servicing, ensuring the unit's safety before returning it to the customer. This check involves measuring AC voltage across a resistor/capacitor combination between earth ground and exposed metallic parts, with a limit of 0.75V RMS.
The manual provides comprehensive internal documentation, including:
The inclusion of these detailed diagrams and lists makes the AM-9080/B highly serviceable by qualified technicians, ensuring long-term usability and repairability. The warning against self-repair underscores the complexity and potential hazards associated with servicing high-power audio equipment.
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