The JVC COLOUR TELEVISION AV-21NT4 Service Manual provides comprehensive instructions for servicing your JVC AV-21NT4 television. This detailed manual covers various aspects of the television, giving you the information you need to troubleshoot and repair issues. The manual is divided into five sections, starting with important safety precautions to ensure your safety during the repair process. The "Specific Service Instructions" section offers detailed technical information about the AV-21NT4, while the "Disassembly" section guides you through the process of taking apart the television for repair. The "Adjustment" section provides instructions for calibrating and adjusting various settings. Finally, the "Troubleshooting" section assists you in identifying and resolving common problems. With its comprehensive content and clear instructions, this service manual is an indispensable resource for anyone working on the JVC AV-21NT4 television.