There is not a discrete 'on' code for the Toshiba HD-Ax, but there is a discrete 'off'. The recommendation I've seen elsewhere is to use 'play' as a substitute for 'on' (or keep track of the power state, and use 'power toggle').
The codes for the Sammy 1000 are basically the same (that's what I use successfully for my 1400. They can be found in the component files download area of either the 9600/9400 or the 7500.
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