Casio Collectors

Hello. I've just uploaded a copy of the Player's Manual for the DH-800 digital horn to the Files section.
 
I'm looking for the Service Manual for the same model. Does anyone have this, or at least the schematic diagram for the main pcb (M264-MA1M)? The other pcbs in the DH-800 are similar to those in the DH-100/DH-200, but this main pcb is unique.
 
Casio published excellent Service Manuals for the DH-100/DH-200 and the DH-500 models, so I would presume that there was a similar manual for the DH-800, but I can't find it anywhere! Can anyone help, please?
 
Thanks, Bruce