Нет.В мануале это описано?
Описано здесь: http://www.scribd.com/doc/80550365/Korg-M3-73-v2-Service-Manual
M3 Test mode
Test mode to confirm that the keybed is not connected when to use as M3-M
Turn the power on pressing ENTER + 6
Full inspection mode
Turn the power on pressing ENTER + 5
Other test mode
ENTER + 0 :Initialize BackupArea
ENTER + 2 :Skip the internal check
ENTER + 7 :Check of connectors of M3-73/88’s Sub-OUT
ENTER + 8 :Ext Key Check
ENTER + 9 iplay of Version No.
MENU + 1 :Option memory simple check
MENU + 2 : writing check of GUID to Firewireboard
MENU + 3 :On Board + Option memory simple check
MENU + 4 :RADIAS Option Check
MENU + 5 :Test Mode
MENU + 6 :Firewire Option Check
MENU + 7 :Option memory Full Check
MENU + 8 :Load Preload/Demo Data
MENU + 9 :On Board + Option memory Full Check
LOCATE + 0 :USB Storage Mode
LOCATE + 1 :Keybed Update
Operation in the test mode
[ENTER] : Proceed to next check
[△] : Proceed to next item
[∇] : Go back to former item
[ FF ] : Proceed to next step
[ RW ] : Go back to former step
Как видите - инфа уже не секретная, если гуглится. Пользуйтесь