CTK-401
100 RHYTHMS
100 TONES
TONE
RHYTHM
SONG BANK
STATUS
TEMPO
VOLUME
100 SONG BANK (00-49)
100 SONG BANK (50-99)
POWER/MODE
MUSICAL INFORMATION SYSTEM
CHORD BOOK
REW
STOP
FF
MAIN SYNCHRO/ START/
VOLUME FILL-IN STOP TEMPO
M
m
7
M7
3
dim
4
TONE
SONG BANK
FINGERED
LEFT
ON/OFF
RIGHT
0
1
2
ON/OFF
CASIO
CHORD
ON
OFF
5
6
7
8
9
NORMAL
PLAY/
PAUSE
C
aug
sus4
-5
add9 CLEAR
RHYTHM
TRANSPOSE/
TUNE
ACCOMP VOLUME
100 SONG BANK KEYBOARD
MUSICAL INFORMATION SYSTEM
SONG BANK CONTROLLER
CTK-401
ELECTRONIC KEYBOARD
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SPECIFICATIONS
GENERAL
Keyboard:
Tones:
49 standard-size keys, 4 octaves
100
Polyphony:
Auto accompaniment
Rhythm patterns:
Tempo:
12 notes maximum (6 for certain tones)
100
Variable (236 steps, = 20 to 255)
2 fingering methods (CASIO CHORD, FINGERED)
START/STOP, SYNCHRO/FILL-IN
0 to 9 (10 steps)
Chords:
Rhythm controller:
Accomp volume:
Song bank
Tunes:
100
Controllers:
Musical dictionary
Name display:
Tempo:
PLAY/PAUSE, STOP, REW, FF, LEFT ON/OFF, RIGHT ON/OFF
TONE, RHYTHM, SONG BANK name/number
Tempo value, metronome, synchro standby, beat indicator
Chord name, Chord form
Chord:
Fingering:
Fingering indcators, parts
Song bank status:
Staff:
Keyboard:
PLAY, PAUSE, REW, FF, playing
Four octaves with sharp and flat indications
Four octaves
Other functions
Transpose:
Tuning:
12 steps (–6 semitones to +5 semitones)
Variable (A4 = approximately 440 Hz ± 50 cents)
0 to 9 (10 steps)
Volume:
Terminals
Phones/Output terminal:
Stereo standard jack
Output Impedance: 100 Ω
Output Voltage: 3.0 V (RMS) MAX
9 V DC
Dual power supply system
Power supply terminal:
Power supply
Batteries:
Six AA-size batteries
Battery life:
AC adaptor:
Approximately 2 hours (SUM-3/R6P)/6 hours (AM3/LR6)
AD-5
Auto power off:
Turns power off approximately six minutes after last key operation. Enabled
under battery power only, can be disabled manually.
2.0 W + 2.0 W
Speaker output:
Power consumption:
Dimensions (HWD):
Weight:
9 V --- 7.0 W
988 × 332 × 124 mm (38-15/16 × 13-1/16 × 4-7/8 inches)
Approximately 3.5 kg (7.7 lbs) (without batteries)
ELECTRICAL
Current drain with 9 V DC:
No sound output
Maximum volume
100 mA ± 20 %
625 mA ± 20 %
with 12 keys C4 to B4 pressed in Synth-Lead 1
Volume: 9 (Max.)
Phone output level (Vrms with 8 Ω load each channel):
with key A4 pressed in Synth-Lead 1
Speaker output level (Vrms with 4 Ω load each channel):
with key A4 pressed in Synth-Lead 1
67 mV ± 20 %
900 mV ± 20 %
5.7 V
Minimum operating voltage:
— 1 —
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BLOCK DIAGRAM
COM1 ~ COM16
LCD Driver
SED1278F0A
LSI3
LCD
Buttons
Keyboard
SEG1 ~ SEG40
RS
R/W
E
KO8 ~
KO12
KI0 ~ KI6
DB4 ~ DB7
Output
Filter (L)
Q104
Power Amp.
TA8248K
IC101
KO0 ~ KO7
Filter (R)
Q105
CPU
MSM 6755B-17
LSI1
MD0 ~ MD7
VC
VCC DVDD
APO
ROM(2M-bit)
UM23C2101M
7384/Q
DC + 9 V IN
MA0 ~ MA17
Power Supply Circuit
Q101 ~ Q103, D104
LSI2
Reset IC
IC1
Oscillator
X1, Q1
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CIRCUIT DESCRIPTION
KEY MATRIX
KI0
KI1
G#2
A2
KI2
E3
F3
F#3
G3
G#3
A3
A#3
B3
0
KI3
C4
KI4
G#4
A4
KI5
E5
KI6
KO0
KO1
KO2
KO3
KO4
KO5
KO6
KO7
KO8
KO9
KO10
KO11
KO12
C2
C#2
D2
D#2
E2
F2
F#2
G2
—
C6
C#4
D4
F5
A#2
B2
A#4
B4
F#5
G5
D#4
E4
C3
C#3
D3
D#3
+
C5
G#5
A5
F4
C#5
D5
F#4
G4
A#5
B5
D#5
Tempo
Down
Tempo
Up
Volume
Down
Volume
Up
Start/
Stop
Synchro/
Fill-in
Chord
Book
Accomp
Volume
3
2
1
Transpose/
Tune
Song
Bank
6
5
4
Rhythm
Normal
Rewind
Tone
CASIO
Chord
9
8
7
Fingered
Stop
Power Off
Play/
Pause
FF
Right
Left
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
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
— 3 —
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CPU (LSI1: MSM6755B-17)
The CPU reads sound data from the ROM in accordance with the pressed key and the selected tone; the CPU
can read rhythm data simultaneously when a rhythm pattern is selected. Then it provides the left and the right
channels’ waveforms separately, by converting the data into the waveforms with two built-in DACs. The CPU
also controls key and button input. The following table shows the pin functions of LSI1.
Pin No.
Terminal
In/Out
Function
1
MA14
Out
Address bus
Not used
2, 3
4 ~ 19
13
NCO
MA0 ~ MA13
MRDB
—
Out
Out
—
Address bus
Read enable signal
Not used
17
MCSB
20 ~ 27
28, 29
30
MD0 ~ MD7
NC1, NC2
DGND
In/Out
—
Data bus
Not used
In
Ground (0 V) source
+5 V source
31
DVCC
In
32, 33
34
XTLO, XTLI
NC3
In/Out
—
20 MHz clock input/output
Not used
35
RSTB
In
Reset signal input
36
P24/RXD
P25/TXD
NMI
—
Not used. Connected to +5 V.
Not used
37
—
38
In
Power ON signal input. Connected to +5 V.
APO (Auto Power Off) signal output
Not used
39
APO
Out
—
40
NC4
41
REFH
Out
—
Terminal for the internal DAC
Not used
42, 43
44
NC5, NC6
DAOR
Out
—
Right channel sound waveform output
Not used
45
NC7
46
AVdac
In
+5 V source for the internal DAC
Left channel sound waveform output
Terminal for the internal DAC and ADC
Ground source for internal DAC
Ground source for internal ADC
APO cancellation signal
47
DAOL
Out
Out
In
48
REFL
49
AGdac
50
AGadc
In
51
ANI
In
52
AVadc
In
+5 V source for the internal ADC
Not used
53
NC8
—
54
MOD0
In
Mode selection terminal. Connected to +5 V.
Mode selection terminal. Connected to ground.
Not used
55, 56
57
MOD1, MOD2
P40
In
—
58 ~ 64
65
KI0/P30 ~ KI7/P36
KI7/P37
KO0/P50 ~ KO7/P57
In
Terminals for key/button input signal
Not used
—
66 ~ 73
Out
Terminals for key scan signal
— 4 —
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Pin No.
Terminal
In/Out
Function
Data bus for the LCD driver
74 ~ 77
DB4 ~ DB7
Out
78
79
NC9
LVCC
—
In
Not used
+5 V source
80 ~ 84
85 ~ 87
88
KO8 ~ KO12
P65 ~ P67
RS
Out
—
Terminals for button scan signal
Not used
Out
Out
Out
—
Control signal for the LCD driver
Read/Write signal for the LCD driver
Chip enable signal for the LCD driver
Not used
89
R/W
90
E
91 ~ 95
96
P73 ~ P77
LGND
In
Ground source
97, 100
MA18, MA15
Out
Address bus
LCD DRIVER (LSI3: SED1278F0A)
The LCD driver can drive a dot matrix LCD having 40 segment and 16 common lines. The LSI contains 240
graphic symbols in the built-in character generator ROM, and stores 80 characters in the built-in display data
RAM. In accordance with command from the CPU, the LSI is capable of displaying up to 16 characters
simultaneously. The following table shows the pin functions of LSI3.
Pin No.
1 ~ 22,
63 ~ 80
Terminal
In/Out
Function
SEG1 ~ SEG40
VSS
Out
—
Segment signal output
GND (0 V) source
23
Terminals for the built-in clock pulse generator. The external
resistor connected determines the oscillation frequency.
LCD drive voltage input.
24, 25
OSC1, OSC2
In/Out
26 ~ 30
V1 ~ V5
In
Those voltages are used for generating the stepped pulse of
the LCD drive signals.
31, 32
33
LP, XCLS
VDD
—
In
Not used
DVDD (+5 V) source
Not used
34, 35
FR, DO
—
Data/command determination terminal.
High: data, Low: command
36
37
RS
In
In
R/W
Read/Write terminal. High: read, Low: write
Chip enable signal.
38
E
In
High: enable, the writing is done at fall edge.
Low: disenable
39 ~ 42
43 ~ 46
47 ~ 62
DB0 ~ DB3
DB4 ~ DB7
—
Not used. Connected to GND (0 V)
In/Out Data bus
Out Common signal/output
COM1 ~ COM16
— 5 —
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FILTER BLOCK
Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms.
Amp.
CPU
Filter
TA8248K
MSM6755B-17
Block
POWER AMPLIFIER (IC101: TA8248K)
The power amplifier is a two-channel amplifier with standby switch.
The following table shows the pin function of IC101.
Pin No.
Terminal
NC
In/Out
—
Function
1
2
Not used
B.S.2
OUT2
VCC
—
Terminal for a bootstrap capacitor
Channel 2 output
3
Out
In
4
+9 V source
5
OUT1
B.S.1
Power GND
Stand by
DC
Out
—
Channel 1 output
6
Terminal for a bootstrap capacitor
Ground (0 V) source
7
In
8
In
Power control signal input. 0 V: Off, +9 V: On
Terminal for a decoupling capacitor
Negative feedback input
Channel 1 input
9
—
10
11
12
13
14, 15
NF1
In
IN1
In
IN2
In
Channel 2 input
NF2
In
Negative feedback input
Ground (0 V) source
Pre GND
In
— 6 —
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ADJUSTMENT
MAIN PCB
1) Items to be adjusted:
Item
Measuring Instrument
Vop voltage setting
Voltmeter
2) Adjustment and Test Point Locations
(TOP VIEW)
Test point
3) Equipment connection/Procedure
Vop voltage setting
Set
Voltmeter
Output
V5
Input
Connection
Input
Point
Input
Signal
Output
Connection Point
Voltmeter V5
Output
Adjust for
Adjust
VR1
Adjust for 4.3 ±0.1 V reading
on voltmeter.
Make fine adjustment accord-
ing to the next instruction.
Eye
Watching the LCD at a 53.5° angle to the horizontal, adjust Vop
voltage so that unenergized segments are seen dimly.
53.5°
LCD
— 7 —
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MAJOR WAVEFORMS
1
2
3
1 Clock pulse
MSM6755B-17 pin 32
2 +5 V source DVDD
JC connector pin 6
3 APO signal
JC connector pin 5
6
7
4
5
6 Button scan signal KO6
JA connector pin 14
4 Sound waveform (R-ch) Tone: Whistle
JC connector pin 4 Key: A4
7 Button scan signal KO7
JA connector pin 15
5 Sound waveform (L-ch) Volume:
JC connector pin 3
8
9
8 LCD common signal COM9
SED1278F0A pin 55
9 LCD common signal COM10
SED1278F0A pin 56
— 8 —
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PRINTED CIRCUIT BOARDS
Main PCB JCM442-MA1M
1
5
4
3
2
6
7
Top View
8
9
Bottom View
— 9 —
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SCHEMATIC DIAGRAMS
Main PCB JCM442-MA1M
2
3
4
5
6
7
1
9
8
— 11 —
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Sub PCB JCM442-MA2M
— 12 —
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Keyboard PCBs KDM4910K-KY1M/KY2M
— 13 —
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LCD
Common
Segment
— 14 —
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EXPLODED VIEW
18
R-1
5
12
14
6
13
11
8
7
10
9
1
15
2
R-2
19
4
R-3
16
4
R-6
17
R-4
R-5
3
— 15 —
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PARTS LIST
CTK-401
Notes: This parts list does not include the cosmetic parts, which
parts are marked with item No. "R-X" in the exploded
view.
Contact our spare parts department if you need these
parts for refurbish.
1. Prices and specifications are subject to change with-
out prior notice.
2. As for spare parts order and supply, refer to the
"GUIDEBOOK for Spare parts Supply", published
seperately.
3. The numbers in item column correspond to the same
numbers in drawing.
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Item
Code No.
Main PCB
Parts Name
Specification
Q
R
1
6926 0200 PCB/ASS'Y (MA1M)
2012 5603 LSI/MC (CPU)
2012 5611 LSI/MASK-ROM
2012 5569 LSI/LCD DRIVER
2012 1883 IC/MOS (RESET IC)
2252 1239 TRANSISTOR
2775 3286 POTENTIOMETER
2590 2100 OSCILLATOR/CERAMIC
Sub PCB
M240592*1
MSM6755B-17
UM23C2101M-7384/Q
SED1278F0A
RN5VD40AA-TR
2SC4081T106Q
1 B
1 A
1 A
1 A
1 B
1 B
1 B
1 B
LSI1
LSI2
LSI3
IC1
Q1
VR1
X1
EVM3SSX50B53
CSACS20.00MX040-TC
2
6926 0190 PCB/ASS'Y (MA2, 3M)
2114 5775 IC/LINEAR (POWER AMP.)
2250 0168 TRANSISTOR
M140548*1
TA8248K
1 B
1 A
1 A
3 A
1 A
1 C
1 C
11 C
1 A
1 A
1 C
1 B
1 B
IC101
Q101
2SA854SR-TP-T
2SC1740SR-TP-T
2SD1858TV2Q
RB100A-T32-T
1T2
1SS133T-77-T
MTZJ6.2A-T77-T
MTZJ5.1A-T77-T
LN28RPX-(TT8)
HEC2305-01-330
YKB21-5006
Q102, Q104/105 2220 1409 TRANSISTOR
Q103
D101
D102
D103
D104
D105
LED101
J101
2250 1585
TRANSISTOR
2390 1323 DIODE/SHOTTKY
2390 3018 DIODE
2390 1344 DIODE
2360 2044 DIODE/ZENER
2360 1799 DIODE/ZENER
2370 0112 LED
3501 7049 JACK (POWER)
3612 0665 JACK (PHONE)
Keyboard PCBs
J102
3
6926 0180 PCB/ASS'Y
M140449*3
1 C
D701 - D749
2301 0101 DIODE
1S2473T-77-T
49 B
Mechanical Parts
B
4
5
6
7
8
3831 0770 SPEAKER
3335 6556 LCD
6926 0270 RUBBER/INTERCONNECTOR
6909 5890 SWITCH/SLIDE KONB
6921 5031 KNOB
6926 0280 RUBBER/BUTTON
6926 0290 RUBBER/BUTTON
6926 0300 RUBBER/BUTTON
6926 0310 RUBBER/BUTTON
6922 2720 KEY SET/LT WHITE
6922 2730 KEY SET/LT WHITE
6922 2740 KEY SET/LT BLACK 10P
6922 4000 RUBBER/CONTACT
6923 2390 RUBBER/CONTACT
6926 0320 PANEL/DISPLAY
6926 0020 COVER/BATTERY
Accessory
S10JA13A
LD-B10023A
M440435-2
CSB-12D
1
1 B
2 C
1 B
M311859-1
M240587-1
M240588-1
M240589-1
M240590-1
M312118*1
M312118*2
M111726-1
M111765-1
M240025-1
M340608-1
M340528*2
1
B
9
1 B
1 B
1 B
1 B
A
1 A
A
1 A
1 A
C
1 B
10
11
12
13
14
15
16
17
18
19
3
2
1
6906 8752 STAND/NOTE
M340629B*2
1
B
Notes: Q – Quantity per unit
R – Rank
— 17 —
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MA0600571A
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