Key

Note: Each key has two contacts,

the first conatct (1) and second contact (2).

Second contact (2)

FI

First contact (1)

KC

SI

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

POWER SUPPLY CIRCUIT

The power supply circuit generates six voltages as shown in the following table. VDD voltage is always generated. The others are controlled by APO signal from the CPU.

Name

Voltage

For operation of

 

 

 

VDD

+5 V

CPU, Reset IC, DSP, Sound source ROM, Working storage RAM, Effect RAM

 

 

 

DVDD

+5 V

Power jack, Sustain jack, MIDI jack

 

 

 

AVDD

+5V

DAC, Filter

 

 

 

LVDD

+4.5 V

LED Driver

 

 

 

VCC

+9 V

Power amplifier, Pilot lamp

 

 

 

VC

+9 V

Power amplifier

 

 

 

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, and clears the working storage RAM.

When the power switch is pressed, the CPU receives a low pulse of POWER signal. The CPU sends APO signal to supply ground source for the DSP, also sends a reset signal to the DSP.

Battery set

VDD

 

VDD

 

RESET

PLE

Reset IC

CPU

LSI105

IC105

UPD912GF-3BA

RE5VA35AA

 

POWER

SCKO

 

NMI

From power switch

 

 

VDD

Reset signal

DSP

 

 

LSI101

 

HG51B227FB

APO

 

— 5 —

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Casio CTK-630 specifications Power Supply Circuit, Reset Circuit, Name Voltage For operation

CTK-630 specifications

The Casio CTK-630 is a portable keyboard designed for musicians of all skill levels, combining functionality, versatility, and user-friendly features. This model is recognized for its 61 piano-style keys, providing an authentic touch for players while ensuring portability. The keyboard is lightweight and easy to transport, making it an excellent choice for home practice or performances on the go.

One of the standout features of the CTK-630 is its extensive range of sounds and rhythms. With over 600 built-in tones, including instruments from around the world, players can explore a variety of musical styles, from classical piano to modern synth sounds. Additionally, the keyboard includes 180 accompaniment rhythms, allowing users to create rich musical backgrounds for their melodies, making practice and improvisation more dynamic.

The CTK-630 is also equipped with advanced technologies that enhance the playing experience. One such feature is the Digital Signal Processing (DSP), which adds effects like reverb and chorus to sounds, enriching the audio output. The keyboard's auto-accompaniment feature automatically provides harmonizing and chordal support based on the notes played, facilitating creative composition.

For musicians interested in learning, the CTK-630 offers built-in lessons that are ideal for beginners. These lessons help users develop their skills progressively, making it easier to learn new songs and techniques. Additionally, the keyboard is compatible with the Casio Chordana Play app, which provides interactive learning tools and song libraries for enhanced educational engagement.

The CTK-630 also includes a pitch bend wheel, allowing players to add expressive pitch variations to their performances. This feature is particularly useful for genres that emphasize playability and dynamics, such as jazz and pop. Furthermore, the keyboard's MIDI compatibility enables users to connect it to computers and use it with various music software, expanding its versatility for compositions and recordings.

In conclusion, the Casio CTK-630 is a versatile and feature-rich portable keyboard that caters to both novice and experienced musicians. Its combination of built-in tones and rhythms, user-friendly learning tools, and connectivity options make it an excellent choice for those looking to explore their musical creativity while enjoying the convenience of portability. Whether practicing at home or playing gigs, the CTK-630 stands out as an accessible and powerful instrument for all.