Casio CTK-431

ELECTRONIC KEYBOARD
CTK-431
CTK-431
MIDI
100 SONG BANK KEYBOARD
MUSICAL INFORMATION SYSTEM
SONG BANK CONTROLLER
POWER/MODE
ON
OFF
FINGERED
MAIN
VOLUME
SYNCHRO/
FILL-IN
START/
STOP
TEMPO CHORD BOOK
ACCOMP VOLUME
CASIO CHORD
NORMAL
M
01234
56789
m 7 M7 dim
TONE
RHYTHM
SONG BANK
STATUS
MAIN VOLUME
TEMPO
aug sus4 -5 add9 CLEAR
RHYTHM
TRANSPOSE/
TUNE/MIDI
LEFT
ON/OFF
RIGHT
ON/OFF
REW STOP FF
TONE SONG BANK
P
L
A
Y
/
P
A
U
S
E
SONG BANK CONTROLLER
MUSICAL INFORMATION SYSTEM
OUTIN
OUTPUT
PHONES/ DC 9V

Casio CTK-431 Specifications

General

Number of Keys	61
Touch Response	No
Polyphony	12
Voices/Tones	100
Built-in Songs	10
Display	LCD
Weight	3.5 kg
Speakers	2 x 2W
Power Supply	6 x AA batteries or AC adapter

Summary

Specifications

General Specifications

Details general features of the keyboard, including keys, tones, polyphony, rhythms, tempo, and functions.

Electrical Specifications

Outlines electrical characteristics like current drain, output levels, power supply, and battery life.

Block Diagram

Circuit Description

Key Matrix and Nomenclature

Explains the key matrix mapping and provides the nomenclature for keyboard keys.

CPU (LSI1) Pin Functions

LCD Driver (LSI3) Pin Functions

Filter Block

Power Amplifier (IC101) Pin Functions

Adjustment

Main PCB Adjustment Points

Identifies adjustment and test points on the main PCB.

Vop Voltage Setting Procedure

Provides instructions for setting the Vop voltage using a voltmeter.

Major Waveforms

Printed Circuit Boards

Main PCB Layout

Shows the top and bottom views of the main PCB (JCM444-MA1M).

Schematic Diagrams

Sub PCB Schematic Diagrams

Details the schematic for sub PCBs (JCM444-MA2M/MA3M).

Keyboard PCB Connections

LCD Display Pinout

Exploded View

Parts List