trouvé sur
http://www.ibanez.com/support/howtos.asp
--------------------------------
ADJUSTING THE INTONATION
Intonation adjustment is usually necessary when new strings are fitted
(it can also be affected by the angle of the tremolo unit).
Adjusting the intonation is performed by moving the individual string saddles
forward or backward.
To check the intonation : Use an electronic tuner and tune the guitar to a standard pitch.
Note : All lbanez guitars use A--440 for a standard pitch. Play the harmonic at the 12th fret, compare it to the fretted noteat the 12th fret, these notes should read the same on the tuner.
Before adjusting the intonation, first determine the direction that the saddle needs to be moved.
Note : If the 12th fret is sharper than the open note, the saddle needs to be moved back.
If the 12th fret is flatter than the open note, the saddle needs to be moved forward.