Yamaha YSP-1 Service Manual page 19

7. Press the "STANDBY/ON" key of the YSP-1 to turn off
the power.
8. While pressing the "VOL+" key and "VOL-" key of the
YSP-1, press the "STANDBY/ON" key of the remote
controller to activate the DIAG function.
1 Using the "UP" or "DOWN" key of the remote
controller, select the DIAG menu in the figure below.
2 Using the "LEFT" or "RIGHT" key of the remote
controller, select the DIAG sub-menu in the figure
below.
3 Using the "SELECT" key of the remote controller,
make a change as shown below.
4 Check the version of the firmware.
The procedure has been completed when "DSP
VER./MID" appears as the DIAG menu and the
same version as shown below is obtained.
9. Press the "STANDBY/ON" key of the YSP-1 to turn off
the power.
Change ON to OFF.
SPID version
YSP-1
19