Hi! My 1988 Yamaha DX7II with E! card has
probably lost its memories due to backup battery failure, either in the DX7 or the
E!card modules. On power.up it only displays
a lot of fffffffffffffff'S and plays no sounds, neither does it work as master keyboard to my other modules. I now have to
load the internal ERAM and Cartridge sounds from my floppy disk every time I want to play.
I have opened the bottom cover, but am unable to find the backup battery location and -type.
Can anyone help? How much do I have to dismantle?
Please reply by E-Mail to
kaada@online.no

Sincerely yours
Arvid Kaada, Sola, Norway.

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See Dave Benson's DX7 Page; it also deals with the E!

ftp://byrd.math.uga.edu/pub/html/dx7.html#grey

Good Luck ,changing the battery appears to be quite a job. I'll have to do it on mine soon.mn