Yamaha YC-25D User manual

6.
CONTENTS
Introduction .
Assembly
Here is Your Yamaha Combo Organ YC—25D .
How to Play Your YC—25D ,
1.
Keyboards . .
2. Tone Levers
3. Effect Levers .
4.
5
Effect Controls
. Effect Selectors .
Other Controls
Care of Your Yamaha Combo Organ
Caution .
OWNER’S MANUAL. Specifications .
D D mM Q A Q N
10
11
11
12
12
13

INTRODUCTION
Thank you for selecting the Yamaha YC—25D for your
TWO—MANUAL combo organ! We hope you will read
this manual carefully and will experiment with the
organs many special features, in order that a more
complete understanding of its versatility will be yours.
The Yamaha Combo Organ Model YC—25D has two—
manual control of tones and effects to create a rich,
percussive effect, upper and lower bright effect, touch
vibrato, individual style, manual/pedal bass switchover,
impressive design. And you get a full array of conven-
ience extras, including pitch, master volume and bass
volume controls, easy set-up and portability, decades-
durable solid state circuitry. The above mentioned
controls and features will be explained in more detail in
the following pages.

_ ASSEMBLY
1.
After
loosening
six
screws
@)
about
half
way,
install
the
legs
(which
are
in
a
spearate
vinyl
carrying
bag)
as
shown
in
the
figure
and
tighten
the
screws.
2.
Open
the
cover
by
releasing
catch®.
The
expression
pedal
and
power
supply
cord
can
then
be
removed.
3.
Check
the
input
cord
for
loose
or
intermittent
connections.
4.
When
standing
the
unit
upright,
balance
it
by
adjusting
balancing
screw
©).
Completely
disassembled,
parts
stored,
and
cover
in
place,
your
Yamaha
Combo
Organ
YC-—25D
becomes
a
convenient,
portable
unit
as shown.

| oe
|
HERE
IS
YOUR
YAMAHA
A
COMBO
ORGAN
YC-25D
® Upper Manual Tone Levers
@ Effect Levers
@ Lower Manual Tone Levers
@ Manual/Pedal Bass Tone Levers
i
@
Effect
Controls
Q Upper Manual
-© Lower Manual
© Manual Bass Section
© Effect Selectors
i
h
ke
al

Upper 2°® ® Upper 1-3/5’
Upper 2-2/3 ® Upper 1”
Upper 4°® @ Length
Upper
8°®
@
4
Percussive
.
Upper
16’®
@
2-2/3°
Upper
Bright
@
@
Lower
Bright
String
4
@
@
Lower
16’
Trumpet
8°@
®
Lower
8’
Kinura
16°@
@
Lower
4’
Trombone
16’@
@
Lower
2-2/3’
Touch
Vibratog
@®
Lower
2’
Vibrato
Speed@
@
Bass
Sustain
Vibratog
©
Bass
16’
Master
Volume@
|
@
Bass
8°
@ Bass Guitar
Bass Volumeg
Pitch control@
Bass Changeover Switch@
@
Manual
Bass
Keyboard
©
Power
Switch
with
Pilot
Lamp
© Manual Balance
® Attack Glide
@ Touch Mute
@ Upper Manual
© Lower Manual

HOW
TO
PLAY
YOUR
YC-25D
1. Keyboards O © ©
The
YC—25D
keyboards
are
as
follows
:
identified
by
reversed
colors,
become
a
manual
bass
section
Upper
Manual
@
|
49
keys
(c-—c4)
4
octaves
when
the
Bass
Changeover
Switch
(Manual/Pedal)
is
set
for
Lower
Manual
©
49
keys
(C~c3)
4
octaves
Manual
Bass.
When
this
switch
is
set
for
Pedal
Bass
and
the
7
Manual
Bass
@
19
keys
(C7-F*)
1%
octaves
optional
pedals
are
attached,
they
work
as
the
bass
section.
|
Pedal
Bass
(optional)
13
keys
(C;~C)
1
octave
In
either
case
bass
tones
are
set
by
the
Manual
Bass
or
Pedal
The
manual
keys
are
made
of
durable
material,
designed
for
Bass
tone
levers.
When
the
pedal
bass
is
used
(with
the
i
years
of
beautiful
appearance
and
playing
ease.
The
manual
switch
set
to
Pedal
Bass),
the
above-mentioned
19
lower
|
keys
work
with
the
tone
levers
for
tone
color
selection.
The
manual
keys
become
a
regular
extension
of
the
lower
manual.
19
bass
keys
on
the
extreme
left
end
of
the
lower
manual,
|
|
2.
Tone
Levers
©
© @
i
There
are
three
groups
:
one
group
for
the
Upper
Manual
the
Manual
or
Pedal
bass
(3
voices).
(11
voices),
one
for
the
Lower
Manual
(5
voices)
and
one
for
|

Exclusive. Yamaha’s Tone Lever System
This unique system provides much more variety than the
conventional on/off system of organ stops. Here each voice
has its own fever, which slides continuously from off to full
for unlimited variety of tonal shadings, a wider expressive
range for the keyboard master. For the beginner, or the
player in a hurry, there are two click-stops along the way, at
1/3 and 2/3 full settings. The click-stops can be clearly felt,
even though they do not hamper the continuous slide control,
and they can be used to reset tonal combinations with mathe-
matical precision. The YC~25D provides this world-famous
system to satisfy every talent and playing style. Full mastery
of tone lever use is the most important point in developing
your own style, so make it a practice to recreate tones you
Harmonic
Tone
levers
provide
several
harmonics
(8’,
16’,
274,
etc.)
;
the
8°
levers
are
“fundamentals,”
which
means
they
have
the
same
pitch
as
the
written
note.
The
others
are
called
“har-
ONE OCTAVE È | ONE OCTAVE
BELOW É| FUNDAMENTAL §| ABOVE ABOVE
FUNDAMENTAL | FUNDAMENTAL É
TWO OCTAVES
FUNDAMENTAL
have heard and like, as well as creating your own. Also note
that the upper, lower and bass tone lever settings will have a
direct effect upon the relative balance of these three sections.
2- ---- 3 (max. volume)
monics”
because
they
are
at
certain
intervals
above
or
below
the
written
note.
For
purposes
of
classification,
harmonics
are
generally
divided
into
“consonants”
(at
octave
intervals
ONE OCTAVE TWO OCTAVES
S| AND A THIRD
ABOVE ABOVE
FUNDAMENTAL FUNDAMENTAL
THREE OCTAVES À] ES
ABOVE AND A FIFTH
FUNDAMENTAL

on
À roe ees 3 a z ‘ m ue
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from the fundamental) and “‘dissonants” (separated by a third
or fifth from the fundamental). An example will show what
this means in playing. If you press middle C (called “c4” in
musical terminology) and set a 4’ tone lever, you will get the
same note as you would by pressing c2 (an octave above c4)
with an 8’ tone lever. This means, of course, that the YC—
25D's range is really much wider than the actual keyboard;
using the 16’ lever, for example, will extend its scope down
to c4 (see illustration). Similarly, the 1° lever raises the tone
three octaves. Here, however, there is a limitation : the
Bass Guitar @
Provides an attack and decay on all bass notes when this
voice is used. The tone decays more rapidly when the
3. EFFECT LEVERS ©
highest note the YC—25D can produce is bs. Any notes above
this will actually sound in the fifth octave above. middle C.
This unavoidable limitation is nothing to worry about, for the
YC—25D's actual range is still more than enough for the most
demanding organist. The use of the harmonic levers is not to
extend the range of pitches, but rather to create richer. full-
bodied tonal combinations within the normal playing range.
They are the spices that flavor the various fundamentals, suit-
ing them to the mood of each selection.
key is depressed.
The effect levers @ of the YC—25D provide a wide range
of tonal effects which add to the variety of possible con-
binations. These levers have the same operation as the tone
levers and allow the organist to vary the depth or speed of
their effects according to their stop positions as illustrated.

Vibrato ©
The use of vibrato increases the emotional quality of the tone
and adds a brisk and lively air to passages of relative sim-
Vibrato Speed Q
Used in concert with the vibrato lever, it controls the
oscillating speed of the vibrato, which increases as it is
Touch Vibrato (Upper Manual) @
This
exclusive
Yamaha
effect
lets
you
play
with
the
same
emotion
in
your
fingers
as
a
violinist.
When
the
middle
lever
shown
in
the
photograph
is
pressed,
the
lateral
vibration
of
the
finger
on
the
key
is
transmitted
as
a
warm
vibrato.
What's
more,
this
key
is
continuously
variable,
so
that
you
can
adjust
Upper Percussive@ @ @
Changing
the
beginning
of
some
or
all
notes
can
do
wonders
-
for
lively
selections.
The
YC—25D
really
shines
here,
thanks
—
to
a
variety
of
percussive
effects.
The
special
popping
4’
and/
or
2-2/3’
percussive
drive
can
be
smoothly
blended
into
all
upper
tones
with
two
variable
levers:
@
and
@
,
plus
Bright (Upper, Lower) ® ®
On
the
upper
manual
this
effect
covers
all
the
white
keys
(16’
to
1’),
and
on
the
lower
manual
from
16’
to
2’.
Each
Bass Sustain ©
This control provide continuous adjustment of the sustain
effect on the Bass concerned. For the Bass, this is the
plicity. Its depth is controlled by this lever.
pulled down.
this
effect’s
intensity
to
suit
any
mood,
matching
vibrato
nuances
to
any
selection
or
passage.
This
effect
is
particularly
dramatic
when
used
with
a
single
voice
forms
the
melodic
line.
It
can
be
used
in
conjunction
with
the
vibrato
lever,
but
if
that
lever
is
set
to
full
it
will
override
the
Touch
Vibrato.
a
separate
one
@)
to
control
the
decay
length
of
these
effects.
Each
note
should
be
played
cleanly
;
slurred
notes
will
diminish
the
percussive
effect.
If
a
second
note
is
pressed
while
the
first
is
still
held
down,
the
percussive
effect
will
be
lost.
lever
is
continually
variable
to
provide
a
hard
string-like
tonal
balance
or
any
shade
down
to
a
soft
flute-like
effect.
only
sustain
control,
and
it
affects
all
Bass
tones
with
the
exception
of
Bass
Guitar
with
sustains
automatically.