After the purchase you will receive a download link within 24 hours after the purchase via an ebay message. The Marantz SR19 is an AV surround receiver known for its high-quality audio performance and advanced features. It's designed to serve as the central hub for your home theater system, providing amplification for connected speakers and processing audio signals from various sources such as Blu-ray players, gaming consoles, and cable boxes. The SR19 likely offers features such as support for surround sound formats like Dolby Atmos and DTS:X, multiple HDMI inputs and outputs, and possibly built-in streaming capabilities for accessing online content. If you have any specific questions about this AV receiver or need more information, feel free to ask! A service manual is a comprehensive document that provides detailed instructions, procedures, and guidelines for maintaining, repairing, and servicing a particular product, equipment, or machinery. It typically includes technical specifications, diagrams, troubleshooting steps, and other relevant information to assist technicians or users in performing tasks effectively and efficiently.