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ELECTRONIC KEYBOARD
CTK-501
CTK-501
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100 SONG BANNK
100 TONES
100 RHYTHMS
POWER/MODE
MAIN VOLUME
TEMPO
MUSICAL INFORMATION SYSTEM
TONE
RHYTHM
SONG BANK
STATUS
TEMPO
MAIN VOLUME
FINGERING/PART
LEFT/
ACCOMP
RIGHT/
MELODY
:1 OCTAVE UP
:PEDAL(SUSTAIN)
100 SONG BANNK KEYBOARD
MUSICAL INFORMATION SYSTEM
ON
OFF
FINGERED
SYNCHRO/
FILL-IN
CHORD BOOK
TONE
Mm
M7
dim
aug
7
sus4
-5
add9
CLEAR
0
123
456
789
RHYTHM
STOP
REW
LEFT
RIGHT
ON/OFF
PLAY/
PAUSE
FF
SONG BANK
TRANSPOSE/
TUNE/MIDI
ACCOMP
VOLUME
START/
STOP
CASIO CHORD
NORMAL
SONG BANK CONTROLLER
SONG BANK CONTROLLER


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CONTENTS
Specifications ................................................................................................................................... 1
Block Diagram .................................................................................................................................. 2
Circuit Description ............................................................................................................................ 3
Adjustment ....................................................................................................................................... 7
Major Waveforms ............................................................................................................................. 8
Printed Circuit Boards ...................................................................................................................... 9
Schematic Diagrams ...................................................................................................................... 11
Exploded View ............................................................................................................................... 16
Parts List ........................................................................................................................................ 17


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-- 1 --
ELECTRICAL
Current drain with 9 V DC:
No sound output
120 mA
± 20%
Maximum volume
750 mA
± 20%
with 12 keys C1 to B1 pressed in Synth-Lead 1
Volume: Maximum
Phone output level (Vrms with 8
load each channel):
with key G2 pressed in Synth-Lead 1
78 mV
± 20%
Speaker output level (Vrms with 4
load each channel):
with key G1 pressed in Synth-Lead 1
1250 mV
± 20%
Minimum operating voltage:
6.0 V
SPECIFICATIONS
GENERAL
Keyboard:
61 standard-size keys, 5 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 information
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, pedal
Song bank status:
PLAY, PAUSE, REW, FF
Staff:
5 octaves with sharp and flat indications
Keyboard:
5 octaves
MIDI:
5 multi-timbre receive
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
MIDI terminals:
IN, OUT
Sustain terminal:
Standard jack
Phones/Output terminal:
Stereo standard jack
Output Impedance: 78
Output Voltage: 4 V (RMS) MAX
Power supply terminal:
9 V DC
Power supply
Dual power supply system
Batteries:
Six D-size batteries
Battery life:
Approximately 10 hours on manganese batteries
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 --- 7.7 W
Dimensions (HWD):
961
× 381 × 139 mm (37-7/8 × 15-1/16 × 5-1/2 inches)
Weight:
Approximately 5.4 kg (11.91 lbs) (without batteries)


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--
2
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BLOCK DIAGRAM
CPU
MSM 6755B-17
LSI2
Keyboard
Buttons
LCD
LCD Driver
SED1278F0A
LSI3
Reset IC
IC1
Oscillator
X1, Q1
Power Supply Circuit
Q201 ~ Q203, Q208, D205
Power Amp.
TA8248K
IC201
Filter (L)
Q206
Filter (R)
Q205
Output
VC
VCC DVDD
APO
DC + 9V IN
DB4 ~ DB7
MIDI IN
MIDI OUT
COM1 ~ COM16
SEG1 ~ SEG40
RS
R/W
E
KO8 ~
KO12
KI0 ~ KI6
KO0 ~ KO7
MD0 ~ MD7
MA0 ~ MA18
ROM(2M-bit)
LC372100PM-
G48
LSI1


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-- 3 --
CIRCUIT DESCRIPTION
KEY MATRIX
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
F3
G3
A3
B3
C4
D4
E4
F4
G4
A4
B4
C5
D5
E5
F5
G5
A5
B5
C6
D#3
C2
D2
E2
F2
G2
A2
B2
C3
D3
E3
B6
A6
G6
F6
E6
D6
C7
C#3
A#2
G#2
F#2
D#2
C#2
A#6
G#6
F#6
D#6
C#6
NOMENCLATURE OF KEYS
KI0
KI1
KI2
KI3
KI4
KI5
KI6
KI7
KO0
C2
G#2
E3
C4
G#4
E5
C6
G#6
KO1
C#2
A2
F3
C#4
A4
F5
C#6
A6
KO2
D2
A#2
F#3
D4
A#4
F#5
D6
A#6
KO3
D#2
B2
G3
D#4
B4
G5
D#6
B6
KO4
E2
C3
G#3
E4
C5
G#5
E6
C7
KO5
F2
C#3
A3
F4
C#5
A5
F6
KO6
F#2
D3
A#3
F#4
D5
A#5
F#6
KO7
G2
D#3
B3
G4
D#5
B5
G6
KO8
--+
0
KO9
32
1
KO10
6
5
4
Rhythm
Tone
KO11
9
8
7
Fingered
Normal
Off
KO12
FF
Right
Stop
Left
REW
Tempo
Down
Tempo
Up
Start/
Stop
Synchro/
Fill-In
Chord
Book
Accomp
Volume
Transpose/
Tune/MIDI
Song
Bank
CASIO
Chord
Play/
Pause
Volume
Down
Volume
Up