Yamaha L Series - Manual (Page 5)

TUNING MACHINE TENSION ADJUSTMENT
The tuning machines have spring-loaded mechanisms which automatically take
up wear, preventing backlash. However, it is possible to adjust the amount of
pressure required to turn the machines. Each machine has a tension adjustment
screw, as illustrated.
• Clockwise screw rotation
tightens the machine. The
tuning machines should be
adjusted to the extent that they
are firm, but can turn smoothly.
This adjustment is normally
unnecessary, and excessive
tightening can lead to premature
tuning machine wear.
TRUSS ROD ADJUSTMENT
The curvature of the neck should be slightly concave. Clockwise rotation of the
nut tightens the rod and corrects for too much concave bow. Counterclockwise
rotation of the nut loosens the rod and corrects for too much convex bend. Make
any adjustments gradually. Allow five to ten minutes for setting, and check the
curvature after each 1/2 turn of the truss rod nut.
NOTE: Unless you have experience with truss rods, we suggest that you
entrust this adjustment to your dealer.
If too much
convex bend
If too much
concave bow
concave
convex
q
q
Loosen
Tighten
If too much
convex bend
If too much
concave bow
• q
• q
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