Yamaha DRCX User Manual page 219

10-4 SERVICE mode function
10
12
10-
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7) When writing is complete, the screen returns
to step 6.
n
NOTE
The password is identical to the DRCX controller's version number. For example, if the controller version is 18.11,
enter 18.11 as the password. Once the password is accepted, it will not be requested unless the TPB is disconnected
from the controller or the controller power is turned off.
[SYS-SAFE-SVCE-SET]
SERVICE mode = 1
0:Invalid 1:Valid