NOMENCLATURE OF KEYS

C#2 D#2

F#2 G#2 A#2

C#3 D#3

F#3 G#3 A#3

C#4 D#4

F#4 G#4 A#4

C#5 D#5

F#5 G#5 A#5

C#6 D#6

F#6 G#6 A#6

C2

D2

E2

F2

G2

A2

B2

C3

D3

E3

F3

G3

A3

B3

C4

D4

E4

F4

G4

A4

B4

C5

D5

E5

F5

G5

A5

B5

C6

D6

E6

F6

G6

A6

B6

C7

RESET CIRCUIT

When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU. The CPU then initializes its internal circuit.

When the power switch is pressed, the CPU receives a low pulse of POWER signal.The CPU raises APO signal to +5 V to turn power on.

Battery set

VDD

 

VDD

 

 

NMI

RESET

CPU

LSI101

 

Reset IC

UPD912GF-3BA

IC104

SCKO

RE5VA35AA

 

POWER

APO

From power switch

Power Supply Circuit

CPU (LSI101: UPD912GF-3BA)

The 16-bit CPU contains a 1k-byte RAM, three 8-bit I/O ports, two timers, a keycontroller and serial interfaces. The CPU detects key velocity by counting the time between first-key input signal FI and second-key SI from the keyboard. The CPU reads sound data and velocity data from the sound source ROM in accordance with the selected tone; the CPU can read rhythm data simultaneously when a rhythm pattern is selected. Then the CPU provides 16-bit serial sound data to the DAC.The CPU also controls MIDI input/output and LED driving.

 

 

 

 

 

 

Sound Source ROM

 

 

 

 

 

 

LSI102

 

 

 

 

 

 

 

MX23C8100PC-12CA19

 

 

 

 

 

 

CE A0 ~ A18

D0 ~ D15

 

 

 

MSB0

MA1 ~

MD0 ~

 

 

 

MA19

MD15

 

 

 

 

 

 

From keyboard

 

 

 

 

 

 

 

 

 

 

FI0 ~ FI7

 

 

 

CPU

 

 

SI0 ~ SI7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LSI101

 

 

 

 

 

 

 

UPD912GF-3BA

 

PG

 

 

 

 

 

 

 

 

 

 

X101

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20 MHz

 

 

 

 

 

SO: Sound data

BOK: Bit clock

LRCK: Word clock

 

 

DAC

 

SO

SI

IC103

ROUT

 

 

 

BOK

CLK

 

 

 

 

 

LRCK

LRCK

LOUT

 

 

 

UPD6379GR

 

 

 

 

 

— 5 —

Page 5
Image 5
Casio CTK-530 manual Nomenclature of Keys, Reset Circuit

CTK-530 specifications

The Casio CTK-530 is a versatile digital keyboard designed for both beginners and experienced musicians. With its impressive array of features and technologies, the CTK-530 offers a perfect blend of functionality and creativity, making it an excellent choice for aspiring musicians and seasoned players alike.

At the heart of the CTK-530 is its 61 touch-sensitive keys, which provide a realistic piano-playing experience. The touch-sensitive feature allows musicians to express dynamics through varying levels of pressure, creating a more authentic sound. The keyboard’s full-size keys are ideal for practicing and performing, allowing users to hone their skills efficiently.

One of the standout features of the CTK-530 is its extensive sound library, offering over 600 built-in tones. These tones cover a wide range of instruments, from classic pianos and electric pianos to synthesizers and orchestral sounds, enabling users to explore various musical styles. The keyboard also includes 180 rhythms, giving musicians a diverse palette to work with when creating original compositions or playing along with backing tracks.

The CTK-530 incorporates Casio's innovative Digital Signal Processing (DSP) technology, which enhances the quality of sound production. This technology allows users to apply various effects, including reverb and chorus, which can be customized to fit individual preferences. This feature also adds depth and richness to performances, making them more engaging.

An integrated lesson function is another highlight of the CTK-530. This feature is particularly useful for beginners, as it provides interactive lessons and practice sessions, allowing users to learn at their own pace. Additionally, the keyboard includes the Casio Chordana app compatibility, enabling smartphone connectivity for even more learning resources and song support.

For those who wish to record their music, the CTK-530 offers a built-in MIDI recorder, allowing users to capture their performances with ease. This feature, combined with an LCD display that provides visual feedback, ensures that both practice and performance are streamlined and efficient.

In terms of connectivity, the CTK-530 includes a headphone output for private playing and audio input for connecting external devices. This feature makes it easy to accompany backing tracks from smartphones or tablets, enhancing the playing experience.

Overall, the Casio CTK-530 is an impressive digital keyboard that offers a wealth of features, making it an excellent choice for anyone looking to explore the world of music. With its blend of sound quality, technology, and user-friendly design, the CTK-530 stands out as an ideal instrument for creativity and learning.