This comprehensive service manual provides detailed technical information for the JVC SP-SMX77 (SP-S77, SP-W77, LS-S77) speaker system. It includes intricate schematics, component diagrams, troubleshooting guides, and repair procedures. You'll gain access to the same technical knowledge used by professional repair shops, allowing you to understand the inner workings of your speaker system and perform repairs or maintenance with confidence. This manual serves as a valuable tool for anyone seeking to repair or understand the complexities of their JVC speaker system.