Yamaha AES920 Series User manual

1
ELECTRIC GUITAR
OWNER’S MANUAL
CONTENTS
VIBRATO SYSTEM Locking Type (part 2) ........................... 7
BRIDGE/SPRING TENSION ADJUSTMENTS ...................... 8
TRUSS ROD ADJUSTMENT ............................................... 9
PICKUP HEIGHT ADJUSTMENT ........................................ 9
CORRECT USE AND HANDLING OF BATTERIES............. 10
Safety Precautions............................................................ 11
CARE AND MAINTENANCE................................................ 2
TUNING MACHINE TENSION ADJUSTMENT...................... 3
HEIGHT ADJUSTABLE LOCKING NUT ............................... 3
SETTING THE STRING ACTION......................................... 4
VIBRATO SYSTEM Vintage Type ........................................ 5
VIBRATO SYSTEM Locking Type (part 1) ........................... 6
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CARE AND MAINTENANCE
Congratulations on your purchase of the
YAMAHA electric guitar.
With reasonable care, your YAMAHA elec-
tric guitar will age gracefully and provide
many years of superlative musical service.
* When connecting or disconnecting cables, turn off the am-
plifier and other equipment or reduce the volume.
* After playing, wipe the entire guitar down, including strings,
with a good polishing cloth. This will remove corrosive skin
oils and acids, and protect the plating, finish, and strings.
* Avoid exposing the guitar to direct sunlight and extremes of
heat and humidity.
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TUNING MACHINE TENSION ADJUSTMENT HEIGHT ADJUSTABLE LOCKING NUT
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.
1) Remove 3 pcs. of hexagonal screws fixing the Lock Pads.
(illustration — A)
2) Loosen 4 pcs. of screws fixing the Nut Base.
(illustration — B)
3) Adjust the height by the Height Adjustment Screw. The Nut
Base gets higher by clockwise rotation, and lower by coun-
terclockwise rotation. (illustration — C)
Clockwise screw rotation tightens the machine. The tuning ma-
chines 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.
NOTE:As the height has been adjusted in the best con-
dition in the factory, please avoid the adjustment
unless you have suitable experience. We suggest
that you entrust this adjustment to your dealer.
Loosen
Tighten
A
B
C
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SETTING THE STRING ACTION
— Bridge —
Height adjustment screw
Height adjustment screws
(for each strings)
Height adjustment screw
String Tuning Height
1st E 1.9 mm
2nd B 2.0 mm
3rd G 2.1 mm
4th D 2.2 mm
5th A 2.3 mm
6th E 2.4 mm
String height refers to the space between the strings and frets,
and has an affect on playability.
String height is adjusted with the bridge and/or the saddle on
the bridge. Adjust height by alternately turning the screws little
by little on the left and right sides.
Set too high and the instrument is hard to play. Too low results
in fret noise.
Adjust so that the space between the string and the last fret
measures as follows:
NOTE: Be sure to perform any necessary adjustments to the
truss rod before performing the following adjustments.
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VIBRATO SYSTEM Vintage Type
Following is the procedure for adjusting the vintage vibrato
system:
To check intonation, compare the harmonic tone (12th fret) to
the fretted tone (12th fret).
●If fretted pitch is higher than harmonic, saddle must be
moved backward to lengthen string.
●If fretted pitch is lower than harmonic, saddle must be
moved forward to shorten string.
When Higher
than harmonic
When Lower
than harmonic
Turn clockwise
Adjustment screw
Bridge saddle
Turn counter-clockwise
Adjustment screw
Bridge saddle
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VIBRATO SYSTEM Locking Type (part 1)
When changing strings it is necessary to cut off the ball ends
of the strings.
Following is the procedure for changing strings and adjusting
the vibrato system:
1) Using the supplied hexagonal wrench, loosen the three hex-
agonal screws on the lock above the nut. (illustration — A)
2) Loosen the individual string locks using the supplied hex-
agonal wrench. (illustration — B)
3) Replace the old strings with new strings.
4) Using the hexagonal wrench, lock each string.
(illustration — B)
After locking the strings, make sure that the fine tuning
thumb screws are in the middle of their range of travel. (il-
lustration — C)
5) Tune the guitar to the correct pitch.
6) Remove the back plate to gain access to the vibrato strings.
Three springs are factory installed and we recommend that
these springs be adjusted so that the vibrato bridge plate
is parallel to the top of the guitar when it is tuned to correct
pitch.
7) Lock the strings above the nut. (illustration — A)
8) Use the fine tuning thumb screw to tune the guitar to the
correct pitch. (illustration — C)
Tighten
Loosen
A
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VIBRATO SYSTEM Locking Type (part 2)
Intonation Adjustment in Vibrato Bridge
1) Loosen the hexagonal screw located in front of each saddle
using the supplied hexagonal wrench. (illustration — D)
2) Slide the saddles by hand to adjust the length of each
string.
3) When the intonation is correct, tighten the hexagonal screw
in front of each saddle to ensure that its position stays sta-
tionary. (illustration — D)
C
B
D
When Higher
than harmonic
Loosen
Tighten
Lower
When Lower
than harmonic
Loosen
Tighten
Higher
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BRIDGE/SPRING TENSION ADJUSTMENTS
For best results the bridge should always be adjusted so it is
parallel to the top surface of the guitar as shown in illustra-
tion (below). This position is maintained by opposing tension
between the strings and the claw springs. If you change string
gauge, you will need to readjust the spring tension to return
the bridge back to the parallel position.
The adjustment procedures are:
1) Remove the screws that attach the tremolo cavity back plate
from the back side of the guitar exposing the claw springs.
2) Make sure that the guitar is tuned to proper pitch.
3) If the bridge is tilted forward (up), tighten spring tension
by turning the claw screws clockwise. If the bridge is tilted
back (down), loosen the spring tension by turning the claw
screws counterclockwise.
(illustration — A)
Be sure to check string pitch after each adjustment to the
spring tension.
A
Adjust the height uniformly
using the two screws A.
A
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TRUSS ROD ADJUSTMENT PICKUP HEIGHT 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.
The height of the pickup (i.e. distance from the strings) affects
gain — the higher the pickup, the louder the sound, and vice
versa. If the pickup is set too high, sustain and playability will
suffer because of the magnetic pull on the strings. Adjust over-
all height using the screws located at either side of the pickup.
If the pickup has individually adjustable polepieces (most hum-
buckers do), these can then be adjusted to achieve the best
overall balance. The polepieces should normally be about 2 or
3 millimeters from the strings.
NOTE:Unless you have experience with truss rods, we sug-
gest that you entrust this adjustment to your dealer.
If too much
convex bend
If too much
concave bow
concave
convex
Single-coil Pickup
Height adjustment screw
Adjustable polepiece
Humbucking Pickup
Height adjustment screw
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Battery
(6LR61 : 9V,
S-006P)
When these run out, don’t just
throw them away, but dispose of
them as minor chemical waste.
CORRECT USE AND HANDLING OF BATTERIES
* When changing batteries, pay close attention to the +/- polarity markings as
shown in the illustration above.
Battery
(6LR61 : 9V,
S-006P)
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