Yamaha VP-1 Owner's Manual page 160

VSC error!
VSC protocol error!
Write protected!
Problem in tone-generator board. This may be a hardware failure. Please consult of
your Yamaha dealer or one of the authorized distributor listed at the back of this
manual.
Problem in communication between the tone-generator board and the main CPU. This
may be a hardware failure. Please consult of your Yamaha dealer or one of the
authorized distributor listed at the back of this manual.
The floppy disk's write-protect tab is in the "on" position. If you wish to alter the
disk's contents, move the tab to the "off" position.
Error Messages
REFERENCE
App - 10
Appendix