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
eae reer erent ere ne ee 6 PT me nn yo EE ps Rp M EL ES
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.

a RAR] Louer een AE AREA ER =
.
. we
. ve
1
Sa
>w; 4
tp 1400 m mm men aandaa © demain rene dates datée on man Anh terial eboney ludo, le she 1 0e A irtena tunashni ni tanta hd em mb on po pt à in ns dd
IES
4. EFFECT CONTROLS ®
. Pitch Control@
This control allows you to vary the pitch as much as 20 cents
above and 3.5 cents below standard {indicated by - mark). Use
Master Volume@
This knob determines the YC—25D’s maximum volume with
the expression pedal fully depressed. Use it to control the
Manual Balance @
Governs the relative strength of upper and lower manuals.
This control is normally left in the center position, but can be
used to strengthen one manual. It can serve to accentuate an
Bass Changeover Switch (Manual/Pedal) @
When set to Manual, bass tones will come from the C—f¥
keys on the lower manual. When set to Bass, bass tones will
come from the pedal-board and the reverse color lower manual
Bass Volume@
The maximum setting of this control will result in bass tones
ten times louder than when it is set at minimum. Continuous
adjustment possible.
it to “tune” the YC—25D to other instruments.
expression pedal's volume range.
upper manual melody in relation to lower manual accompani-
ment (turn to the right), or lower manual tones (turn to the
left).
keys will serve as a 19—note extension of that manual. Bass
pedalboard (Model BP—1) is available as an optional accessory.
Manual O
Bass
Reversed color manual keys become
bass section (pedals do not function
even if connected).
Manual Pedal
Bass
Pedais become bass section (reversed
BP—1 color manual keys become extension
of lower manual}.

Le D A iteals
5. EFFECT SELECTORS @
Touch Mute @
Works
like
touch
vibrato
on
all
upper
manual
keys.
Instead
of
mute
translates
the
lateral
vibration
of
the
fingers
into
a
changing
the
volume
of
the
note,
as
touch
vibrato
does,
touch
change
in
tone
color.
Attack Glide ®
When
this
selector
is
set
all
upper
manual
notes
sound
approximately
one
second.
To
use
this.
effect,
be
sure
to
slightly
lower
(approximately
90
cents)
than
their
true
pitch
play
each
note
cleanly
;
if
a
key
is
depressed
before
the
one
when
the
key
is
pressed,
then
return
to
true
pitch
within before
it
is
released,
there
will
be
no
glide
on
that-note.
6. OTHER CONTROLS
Power Switch with Pilot Lamp ©
It
incorporates
a
pilot
lamp
for
quick-glance
verification
of
whether
the
power
has
been
switched
on
or
off.
Expression Pedal @
Depress
it
to
increase
the
volume
while
playing.
Optional
Pedalboard
Socket
Please
connect
the
cable
from
pedal
keyboard
unit
to
“optional
pedalboard
socket”
to
control
the
bass
tone
with
pedal
keyboard.
Be
sure to
set
Bass
Changeover
Switch
for
“PEDAL”,
Output Jack
Feeds the signal to your amplifier system.
Output Jack
11

PONE A REN nN he AN
CARE OF YOUR YAMAHA COMBO ORGAN
een
In
general,
you
should
treat
your
Combo
Organ
with
the
same
care
you
would
give
any
fine
musical
instrument.
However
—
the
following
points
are
suggested
to
assure
optimum
enjoyment.
we
'
“4
sine
oh
|
f
When
you
have
finished
playing,
be
sure
to
turn
off
(3}
Check
the
input
cord
for
loose
connections
or
|
the
power
switch.
shorts.
:
|
2. In
order
to
clean
manual
keys,
tabs,
etc.,
use
a
damp
(4)
Make
sure
the
master
volume
control
is
turned
up
n
cloth.
Never
apply
household
cleaners
or
solvents
such
at
least
part
way
and
that
the
swell
shoe
is
firmly
|
as
alcohol,
as
they
may
damage
the
plastic
materials
attached
and
depressed.
At
least
one
tone
volume
Hi
used.
lever
must
be
on,
and.
the
balance
lever
set
to
favor that section of voices.
3. if your Yamaha Combo Organ becomes inoperative or
does not function properly, first follow this simple step- 4. 1f, after checking the above points, the instrument still
by-step check list before calling for service. seems to be out of order, contact your Yamaha Service
Agent. The Yamaha Combo Organ uses 1C’'s and other
(1) Make certain that the line cord is plugged into a solid state devices so, do not attempt to touch or
live AC outlet. Make sure the wall receptacle is otherwise interfere with the circuits or internal elements
not faulty. (Hum from the speaker may be of this instrument.
reduced by reversing the line cord plug in the wall
outlet.)
(2) Be sure the “ON-OFF” Power Switch is on. Pilot
Lamp will light to indicate this.
l CAUTION
E VOLTAGE ADJUST
: toed se die Le A
mp om eed RNA A VALED EE ER EE A YEMEN en RRP LA ERA LL 9m
Before you plug in the AC supply, please check Voltage settings: 100, 110, 117, 125, 220, 240 V
that the voltage selector is set to your local Models for the U.S., Canada, England and
current. If not properly set, pull out the socket North Europe are properly preset before ship-
and reinsert it to the correct voltage position. ment.
12.
Lens rte ram N Pa san aehan eme aeaa a ut

SPECIFICATIONS
KEYBOARDS
Upper Manual
Lower Manual
Manual Bass
Pedal Bass
TONE LEVERS
Upper Manual
Lower Manual
Manual/Pedal Bass
EFFECT LEVERS
Upper & Lower
49 keys {c ~ ca)
49 keys (C ~ c3)
19 keys (C1 ~ F4#)
13 keys (C1 ~C)
16',8', 4’, 27/3, 2"
13/5 ,1
Trombone 16’
Kinura 16’
Trumpet 8’
String 4’
16’, 8’, 4’, 27/3 ,2'
Bass 16’
Bass 8’
Bass Guitar
Vibrato
Vibrato Speed
Upper Touch Vibrato
Bright
Percussive Length
Percussive 4’
Percussive 22/3
Lower Bright
Bass Bass Sustain
EFFECT SELECTORS
Upper Manual Touch Mute
Attack Glide
OTHER CONTROLS
Bass
Changeover
Switch
(Manual/Pedal)
Pitch
Control
Bass Volume Control
Master Volume Control
Manual Balance Control
OTHER FITTINGS
Power Switch with Pilot Lamp
Expression Pedal
Opfional Pedalboard Socket
Output Jack
CIRCUITRY
Solid State (incl. ICs)
POWER
CONSUMPTION
15
Watts
DIMENSIONS
(WxHxD)
101
x
97
x
62cm
(40
x
38
x
24°')
WEIGHT (with legs)
43 kg (95 Ibs.)
FINISH
Red,
or
American
Walnut
with
Grey Leatherette Siding
OPTIONAL
ACCESSORY
~- Bass Pedalboard (BP-1)}
13
FOR
THE
BRITISH
STANDARD
MODELS
As
the
colours
of
the
wires
in
the
mains
lead
of
the
apparatus
may
not
correspond
with
the
coloured
markings
identifying
the
terminals
in
your
plug
proceed
as
follows.
-The
wire
which
is
coloured
GREEN-and-YELLOW
must
be
connected
to
the
terminal
in
the
plug
which
is
marked
by
the
letter
E
or
by
the
safety
earth
symbol
==
or
coloured
GREEN
or
GREEN-
and
-YELLOW.
The
wire
which
is
coloured
BLUE
must
be
con-
l
nected
tọ
the
terminal
which
is
marked
with
the
letter
N
or
coloured
BLACK.
f
The
wire
which
is
coloured
BROWN
must
be
connected
to
the
terminal
which
is
marked
with
the
letter
L
or
coloured
RED.
IMPORTANT:
The
wires
in
the
mains
lead
are
coloured
in
accordance
with
the
following
code.
GREEN-and-YELLOW,
................
Earth
BLUE.
etre
Dour
one
A
Neutral
BROWN
Le
drain
sine
nine
Su
no
Live
WARNING:
This
apparatus
must
be
earthed.
Specifications
subject
to
change
without
notice.