Yamaha SIGMA-G5SII Service Information page 238

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3. When the operation is to be
performed from the front side (on the
breaker side), press down "Front
Panel". When the operation is to be
performed from the rear side, press
down "Rear Panel". In the event that
nothing happens even when the key
is touched, wait for about five
seconds until the following window
appears.
4. In the event that the key is not
touched in the above window, the
valid surface is switched to the
front or rear and the window is
displayed where touching again is
urged. If nothing happens in the
window in Step 3, touch the key in
this window.
SI1705004E-00=SIGMA-G5SII Service Manual