View online or download Casio HT-6000 Operation Manual. CASIO HT-6000. We have 1 CASIO HT-6000 manual available for free PDF download: Operation Manual Product information on Casio HT-6000 on Synthpedia. complete parameter list silkscreened on the outer panel, somewhat alleviating the need for a manual.SERVICE MANUAL. & PARTS LIST. ELECTRONIC KEYBOARD. HT-6000. SEPT. 1987. CASIO. HY ARMY. DDDDJUDIOS. JUUDBUD. FERRUPT. HT-6000. CASIO. MASTER. Get manuals, specifications, and demos for the Casio HT-6000 synthesizer. Download Service & Owner's Manual for Casio HT 6000 Electronic Music Instrument | SynthXL - FREE Service & Owner's manual. CASIO HT-6000. PROGRAMMABLE DIGITAL SYNTHESIZER. Introduction. Thank you and congratulations on your purchase of the. Casio EFT-6000 Digital Synthesizer.