ELECTRONIC KEYBOARD
CTK-401
CTK-401
POWER/MODE
FINGERED
MAIN
VOLUME
SYNCHRO/
FILL-IN
START/
STOP
TEMPO
CHORD BOOK
M
01
2
3
4
5
67
8
9
m
7
M7
dim
aug
sus4
-5
add9
CLEAR
ACCOMP VOLUME
CASIO
CHORD
ON
OFF
NORMAL
100 RHYTHMS
100 SONG BANK (00-49)
TONE
SONG BANK
REW
STOP
FF
100 SONG BANK KEYBOARD
MUSICAL INFORMATION SYSTEM
SONG BANK CONTROLLER
LEFT
ON/OFF
RIGHT
ON/OFF
PLAY/
PAUSE
TRANSPOSE/
TUNE
RHYTHM
SO
NG BA
NK CONTRO
LLE
R
100 TONES
100 SONG BANK (50-99)
TONE
RHYTHM
SONG BANK
MUSICAL INFORMATION SYSTEM
STATUS
TEMPO
VOLUME
CONTENTS
Specifications ................................................................................................................................... 1
Block Diagram .................................................................................................................................. 2
Circuit Description ............................................................................................................................ 3
Adjustment ....................................................................................................................................... 7
Major Waveforms ............................................................................................................................. 8
Printed Circuit Boards ...................................................................................................................... 9
Schematic Diagrams ...................................................................................................................... 11
Exploded View ............................................................................................................................... 15
Parts List ........................................................................................................................................ 17
-- 1 --
SPECIFICATIONS
GENERAL
Keyboard:
49 standard-size keys, 4 octaves
Tones:
100
Polyphony:
12 notes maximum (6 for certain tones)
Auto accompaniment
Rhythm patterns:
100
Tempo:
Variable (236 steps,
= 20 to 255)
Chords:
2 fingering methods (CASIO CHORD, FINGERED)
Rhythm controller:
START/STOP, SYNCHRO/FILL-IN
Accomp volume:
0 to 9 (10 steps)
Song bank
Tunes:
100
Controllers:
PLAY/PAUSE, STOP, REW, FF, LEFT ON/OFF, RIGHT ON/OFF
Musical dictionary
Name display:
TONE, RHYTHM, SONG BANK name/number
Tempo:
Tempo value, metronome, synchro standby, beat indicator
Chord:
Chord name, Chord form
Fingering:
Fingering indcators, parts
Song bank status:
PLAY, PAUSE, REW, FF, playing
Staff:
Four octaves with sharp and flat indications
Keyboard:
Four octaves
Other functions
Transpose:
12 steps (6 semitones to +5 semitones)
Tuning:
Variable (A4 = approximately 440 Hz
± 50 cents)
Volume:
0 to 9 (10 steps)
Terminals
Phones/Output terminal:
Stereo standard jack
Output Impedance: 100
Output Voltage: 3.0 V (RMS) MAX
Power supply terminal:
9 V DC
Power supply
Dual power supply system
Batteries:
Six AA-size batteries
Battery life:
Approximately 2 hours (SUM-3/R6P)/6 hours (AM3/LR6)
AC adaptor:
AD-5
Auto power off:
Turns power off approximately six minutes after last key operation. Enabled
under battery power only, can be disabled manually.
Speaker output:
2.0 W + 2.0 W
Power consumption:
9 V --- 7.0 W
Dimensions (HWD):
988
× 332 × 124 mm (38-15/16 × 13-1/16 × 4-7/8 inches)
Weight:
Approximately 3.5 kg (7.7 lbs) (without batteries)
ELECTRICAL
Current drain with 9 V DC:
No sound output
100 mA
± 20 %
Maximum volume
625 mA
± 20 %
with 12 keys C4 to B4 pressed in Synth-Lead 1
Volume: 9 (Max.)
Phone output level (Vrms with 8
load each channel):
with key A4 pressed in Synth-Lead 1
67 mV
± 20 %
Speaker output level (Vrms with 4
load each channel):
with key A4 pressed in Synth-Lead 1
900 mV
± 20 %
Minimum operating voltage:
5.7 V
--
2
--
BLOCK DIAGRAM
CPU
MSM 6755B-17
LSI1
Keyboard
Buttons
LCD
LCD Driver
SED1278F0A
LSI3
Reset IC
IC1
Oscillator
X1, Q1
Power Supply Circuit
Q101 ~ Q103, D104
Power Amp.
TA8248K
IC101
Filter (L)
Q104
Filter (R)
Q105
Output
VC
VCC DVDD
APO
MD0 ~ MD7
MA0 ~ MA17
DC + 9 V IN
DB4 ~ DB7
COM1 ~ COM16
SEG1 ~ SEG40
RS
R/W
E
KO8 ~
KO12
KI0 ~ KI6
KO0 ~ KO7
ROM(2M-bit)
UM23C2101M
7384/Q
LSI2
-- 3 --
CIRCUIT DESCRIPTION
KEY MATRIX
NOMENCLATURE OF KEYS
KI0
KI1
KI2
KI3
KI4
KI5
KI6
KO0
C2
G#2
E3
C4
G#4
E5
C6
KO1
C#2
A2
F3
C#4
A4
F5
KO2
D2
A#2
F#3
D4
A#4
F#5
KO3
D#2
B2
G3
D#4
B4
G5
KO4
E2
C3
G#3
E4
C5
G#5
KO5
F2
C#3
A3
F4
C#5
A5
KO6
F#2
D3
A#3
F#4
D5
A#5
KO7
G2
D#3
B3
G4
D#5
B5
KO8
--+
0
Tempo
Down
Tempo
Up
Volume
Down
Volume
Up
KO9
32
1
Start/
Stop
Synchro/
Fill-in
Chord
Book
Accomp
Volume
KO10
65
4
Transpose/
Tune
Song
Bank
Rhythm
Tone
KO11
9
8
7
Fingered
CASIO
Chord
Normal
Power Off
KO12
FF
Right
Play/
Pause
Stop
Left
Rewind
C2
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
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