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19 Aug 2014 Casio's CTK-520L is from the family of Lighted Keys. 9 Jul 2012 User review from Zuma Otto Rivers about Casio CTK-520L : This is a toy, not a musical instrument! There is not really need the manual.View and Download CASIO CTK-520L operation manual online. Electronic Musical Instrument. CTK-520L Electronic Keyboard pdf manual download. 26 Jul 2015 User manual , users manuals , user guide , operating instructions. CASIO - Musical Instruments. User manual, View CTK-520L pdf User manual. Download View and Download Casio CTK-520L operation manual online. ELECTRONIC MUSICAL INSTRUMENT. CTK-520L Electronic Keyboard pdf manual download. This manual is not available on the Casio site. It is rather obscure to turn off the key lighting system. You must hold down the tone button and Casio CTK-520L Pdf User Manuals. View online or download Casio CTK-520L Operation Manual, Service Manual. 23 Nov 2016