Sony HCD-DZ100 Operating Instructions Manual page 23

If the color system of the TV is PAL
To set the system to PAL from NTSC, turn on the system by pressing "/1 while pressing X on the
system.
You need to hold X until the set powers on.
To reset to NTSC, turn off the system and then turn on again by pressing "/1 while pressing and
holding X on the system.
If the color system of the TV is NTSC
Do the same operation above to set the system to NTSC from PAL.
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