🏷️ Basic Information Identification Make: JVC Model: AV-21U4 Year: Unknown Generation: Unknown 📋 Manual Details General Manual Type: Service Manual Language: English Page Count: 46 Format: PDF Content Primary Focus: Servicing and Repair Included Sections: Precautions, Specific Service Instructions, Disassembly, Adjustment, Troubleshooting 🛡️ Safety Features Precautions Safety Precautions Included: Yes 🔧 Maintenance Troubleshooting Troubleshooting Guide Availability: Yes Adjustment Adjustment Procedures: Yes Disassembly Disassembly Instructions: Yes 📄 Technical Features Display Display Type: Colour Television Screen Size: 21 inches Audio Audio System: Stereo (Likely) Connectivity Input Ports: Multiple (Likely including AV, S-Video, Antenna) Power Power Source: AC Mains 📄 Documentation Download Downloadable: Yes