Ibanez AM53-SRF Mode D'emploi page 40

STRING HEIGHT
Action refers to the distance between the frets and the string.
To measure the action, tune the guitar accurately; then place a ruler at the 14th
fret and measure the distance from the top of the fret to the bottom of the string.
In general, this distance should be 1.5--1.7 mm for the fi rst string, and 2.0 mm--
2.2 mm for the sixth string.
For a seven-string guitar, the seventh string should be at 2.2 mm--2.4 mm. For an
eight-string guitar, the eighth string should be at 2.4 mm--2.6 mm.
For strings other than those listed above, adjust the action so that the distance gradually increases from the
fi rst string toward the lowest string.
If the action is too high, the instrument will be diffi cult to play. If the action is too low, you may experience
string buzz, muted notes, or poor sustain.
If you experience string buzz or muted notes even when the action is adjusted correctly, you might need to
adjust the neck bow.
For details, refer to "Neck" (p. 38).
The method of adjusting the action will depend on the type of tremolo/bridge with which your guitar is equipped.
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For details, refer to the appropriate tremolo/bridge section.
INTONATION
If youʼve changed string gauges or are using your
guitar with an alternative tuning, youʼll need to adjust
the string length (intonation) to ensure that the
correct pitch is sounded at all frets.
After tuning your guitar accurately, hold the guitar in
playing position and compare the pitch of each string
pressed down at the 12th fret with the pitch of the
harmonic played at the 12th fret.
If the pitch of the fretted note at the 12th fret is
lower than the harmonic at that fret, move the saddle of the tremolo/bridge forward to shorten the string.
Conversely, if the pitch of the fretted note is higher than the pitch of the harmonic, move the saddle backward
to lengthen the string.
Use a tuning meter to ensure accurate intonation adjustments.
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The method of adjusting the saddle position will differ depending on the installed model of tremolo/bridge. For
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details, refer to the section for the tremolo/bridge thatʼs installed on your guitar.
NECK ADJUSTMENT
The neck is constantly bearing the tension of the strings, and its curvature will be subtly affected not only by
the state of tuning and the string gauge, but also by changes in temperature and humidity.
If you experience problems such as string buzz or muted notes even after the action and tuning are adjusted
correctly, you should check and adjust the curvature of the neck.
1 Check the curvature of the neck.
After tuning accurately, hold the guitar in playing
position. Then press the fi rst string at the fi rst fret and
also at the fret that is nearest to the point where the
neck joins the body, and measure the gap between the
string and fret at the eighth fret.
In the same way, measure this gap for the lowest
string, and make adjustments so that the gaps are in
the range of 0.3 mm--0.5 mm.
2 If the gap is less than 0.3 mm, use the HEX key wrench
or socket wrench included with the guitar to turn the
truss rod nut located at the headstock end of the neck
in direction ʻAʼ, causing the neck curvature to be more
convex.
38
12F
8th fret