gtr777Manuals and User Guides for Sony HCD-GTR777 HCD-GTR888. We have 1 Sony HCD-GTR777 HCD-GTR888 manual available for free PDF download: Service ManualHCD-GTR333 GTR555 GTR777 GTR888 DIAGRAMA SONY. Antonio TR Diagramas. Manual de Servicio Reparación de Sony Genezi modelo (MHC) o HCD-GTR333 GTR555 GTR777