JVC | Customer Support | User Manuals Instruction Book Download We have the following book(s) for the model GR-DF428AH: Instruction manual. 3.08 MB (3,237,768 bytes). PDF File. Click the link to view it. Right click the link and select Save Target As... or Save Link As... to save it to your file system. View books in pdf format with Adobe Acrobat Reader.