I have a Kurzweil Midiboard v3.0 and find that I now receive the "6 Err" message when I start up. Also, what do I need to do to get another set of manuals?
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You can order a manual from the parts department here (310) 926-3200.

You have a Memory error. (It has gotten corrupted.) To clear the memory: After the message is displayed, hit Shift Cancel to clear the display. The machine should say "Restore?" Press 1 and the memory will be erased. If you press 0, it will not restore, and go into Play mode. The keyboard should work, but your setups may be screwed up.

If this error persists, it is likely that the backup battery needs to be replaced.