CTK-401
100 RHYTHMS
100 TONES
TONE
RHYTHM
SONG BANK
STATUS
TEMPO
VOLUME
100 SONG BANK (00-49)
POWER/MODE
100 SONG BANK (50-99)
MUSICAL INFORMATION SYSTEM
MAIN SYNCHRO/ START/
VOLUME FILL-IN
STOP TEMPO
CHORD BOOK
REW
M
m
7
M7
dim
3
4
TONE
STOP
FF
SONG BANK
FINGERED
ON
0
CASIO
CHORD
OFF
1
5
6
aug
sus4
NORMAL
2
7
8
LEFT
ON/OFF
RIGHT
ON/OFF
9
PLAY/
ACCOMP VOLUME
-5
add9
CLEAR
RHYTHM
TRANSPOSE/
TUNE
SO
NG
PAUSE
ER
BANK CONTROLL
100 SONG BANK KEYBOARD
MUSICAL INFORMATION SYSTEM
SONG BANK CONTROLLER
CTK-401
ELECTRONIC KEYBOARD
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
SPECIFICATIONS
GENERAL
Keyboard:
Tones:
Polyphony:
Auto accompaniment
Rhythm patterns:
Tempo:
Chords:
Rhythm controller:
Accomp volume:
Song bank
Tunes:
Controllers:
Musical dictionary
Name display:
Tempo:
Chord:
Fingering:
Song bank status:
Staff:
Keyboard:
Other functions
Transpose:
Tuning:
Volume:
Terminals
Phones/Output terminal:
Power supply terminal:
Power supply
Batteries:
Battery life:
AC adaptor:
Auto power off:
Speaker output:
Power consumption:
Dimensions (HWD):
Weight:
49 standard-size keys, 4 octaves
100
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)
100
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
Fingering indcators, parts
PLAY, PAUSE, REW, FF, playing
Four octaves with sharp and flat indications
Four octaves
12 steps (–6 semitones to +5 semitones)
Variable (A4 = approximately 440 Hz ± 50 cents)
0 to 9 (10 steps)
Stereo standard jack
Output Impedance: 100 Ω
Output Voltage: 3.0 V (RMS) MAX
9 V DC
Dual power supply system
Six AA-size batteries
Approximately 2 hours (SUM-3/R6P)/6 hours (AM3/LR6)
AD-5
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
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
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
Minimum operating voltage:
—1—
100 mA ± 20 %
625 mA ± 20 %
67 mV ± 20 %
900 mV ± 20 %
5.7 V
BLOCK DIAGRAM
COM1 ~ COM16
LCD Driver
SED1278F0A
LSI3
LCD
Buttons
Keyboard
SEG1 ~ SEG40
DB4 ~ DB7
Output
—2—
Power Amp.
TA8248K
IC101
KO8 ~
KO12
KI0 ~ KI6
Filter (L)
Q104
KO0 ~ KO7
Filter (R)
Q105
VC
RS
R/W
E
VCC DVDD
CPU
MSM 6755B-17
LSI1
MD0 ~ MD7
APO
DC + 9 V IN
MA0 ~ MA17
Power Supply Circuit
Q101 ~ Q103, D104
Reset IC
IC1
Oscillator
X1, Q1
ROM(2M-bit)
UM23C2101M
7384/Q
LSI2
CIRCUIT DESCRIPTION
KEY MATRIX
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
3
2
1
Accomp
Volume
6
5
4
Synchro/
Fill-in
Song
Bank
Chord
Book
KO10
Start/
Stop
Transpose/
Tune
Rhythm
Tone
KO11
9
8
7
Fingered
CASIO
Chord
Normal
Power Off
KO12
FF
Right
Play/
Pause
Stop
Left
Rewind
NOMENCLATURE OF KEYS
C#2 D#2
C2
D2
E2
F#2 G#2
F2
G2
A#2
A2
B2
C#3 D#3
C3
D3
E3
F#3 G#3
F3
G3
A#3
A3
C#4 D#4
B3
C4
D4
—3—
F#4 G#4
E4
F4
G4
A#4
A4
C#5 D#5
B4
C5
D5
F#5 G#5
E5
F5
G5
A#5
A5
B5
C6
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.
1
Terminal
MA14
In/Out
Out
Function
2, 3
NCO
—
Not used
4 ~ 19
MA0 ~ MA13
Out
Address bus
13
MRDB
Out
Read enable signal
17
MCSB
—
Not used
20 ~ 27
MD0 ~ MD7
In/Out
Data bus
28, 29
NC1, NC2
—
Not used
30
DGND
In
Ground (0 V) source
31
DVCC
In
+5 V source
32, 33
XTLO, XTLI
In/Out
34
NC3
—
Not used
35
RSTB
In
Reset signal input
36
P24/RXD
—
Not used. Connected to +5 V.
37
P25/TXD
—
Not used
38
NMI
In
Power ON signal input. Connected to +5 V.
39
APO
Out
APO (Auto Power Off) signal output
40
NC4
—
Not used
41
REFH
Out
Terminal for the internal DAC
42, 43
NC5, NC6
—
Not used
44
DAOR
Out
Right channel sound waveform output
45
NC7
—
Not used
46
AVdac
In
+5 V source for the internal DAC
47
DAOL
Out
Left channel sound waveform output
48
REFL
Out
Terminal for the internal DAC and ADC
49
AGdac
In
Ground source for internal DAC
50
AGadc
In
Ground source for internal ADC
51
ANI
In
APO cancellation signal
52
AVadc
In
+5 V source for the internal ADC
53
NC8
—
Not used
54
MOD0
In
Mode selection terminal. Connected to +5 V.
55, 56
MOD1, MOD2
In
Mode selection terminal. Connected to ground.
57
P40
—
Not used
58 ~ 64
KI0/P30 ~ KI7/P36
In
Terminals for key/button input signal
65
KI7/P37
—
Not used
66 ~ 73
KO0/P50 ~ KO7/P57
Out
Address bus
20 MHz clock input/output
Terminals for key scan signal
—4—
Pin No.
74 ~ 77
Terminal
DB4 ~ DB7
In/Out
Out
Function
Data bus for the LCD driver
78
NC9
—
Not used
79
LVCC
In
+5 V source
80 ~ 84
KO8 ~ KO12
Out
Terminals for button scan signal
85 ~ 87
P65 ~ P67
—
Not used
88
RS
Out
Control signal for the LCD driver
89
R/W
Out
Read/Write signal for the LCD driver
90
E
Out
Chip enable signal for the LCD driver
91 ~ 95
P73 ~ P77
—
Not used
96
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
Out
23
VSS
—
24, 25
OSC1, OSC2
In/Out
26 ~ 30
V1 ~ V5
In
31, 32
LP, XCLS
—
Not used
33
VDD
In
DVDD (+5 V) source
34, 35
FR, DO
—
Not used
36
RS
In
Data/command determination terminal.
High: data, Low: command
37
R/W
In
Read/Write terminal. High: read, Low: write
Segment signal output
GND (0 V) source
Terminals for the built-in clock pulse generator. The external
resistor connected determines the oscillation frequency.
LCD drive voltage input.
Those voltages are used for generating the stepped pulse of
the LCD drive signals.
38
E
In
Chip enable signal.
High: enable, the writing is done at fall edge.
Low: disenable
39 ~ 42
DB0 ~ DB3
—
Not used. Connected to GND (0 V)
43 ~ 46
DB4 ~ DB7
In/Out
47 ~ 62
COM1 ~ COM16
Out
Data bus
Common signal/output
—5—
FILTER BLOCK
Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms.
Amp.
TA8248K
CPU
MSM6755B-17
Filter
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
In/Out
Function
1
NC
—
Not used
2
B.S.2
—
Terminal for a bootstrap capacitor
3
OUT2
Out
4
VCC
In
5
OUT1
Out
6
B.S.1
—
Terminal for a bootstrap capacitor
7
Power GND
In
Ground (0 V) source
8
Stand by
In
Power control signal input. 0 V: Off, +9 V: On
9
DC
—
Terminal for a decoupling capacitor
10
NF1
In
Negative feedback input
11
IN1
In
Channel 1 input
12
IN2
In
Channel 2 input
13
NF2
In
Negative feedback input
14, 15
Pre GND
In
Ground (0 V) source
Channel 2 output
+9 V source
Channel 1 output
—6—
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
Adjust
VR1
Output
Connection
Output
Point
Voltmeter
V5
Adjust for
Adjust for 4.3 ±0.1 V reading
on voltmeter.
Make fine adjustment according 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—
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
4
7
5
6 Button scan signal KO6
JA connector pin 14
7 Button scan signal KO7
JA connector pin 15
4 Sound waveform (R-ch) Tone: Whistle
JC connector pin 4
Key:
A4
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—
PRINTED CIRCUIT BOARDS
Main PCB JCM442-MA1M
1
5
4
3
6
2
7
Top View
8
Bottom View
—9—
9
SCHEMATIC DIAGRAMS
Main PCB JCM442-MA1M
2
3
4
5
6
1
9
8
— 11 —
7
Sub PCB JCM442-MA2M
— 12 —
Keyboard PCBs KDM4910K-KY1M/KY2M
— 13 —
COM7
COM6
COM5
COM4
COM3
COM2
COM1
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
COM7
COM6
COM5
COM4
COM3
COM2
COM1
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
Common
COM11
COM12
SEG39
SEG40
COM10
COM9
COM14
COM15
COM16
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
NC
NC
NC
COM16
COM15
COM14
COM13
COM12
COM11
COM10
COM9
COM16
COM15
COM14
COM13
COM11
COM12
SEG39
SEG40
COM10
COM9
COM14
COM15
COM16
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
NC
NC
NC
COM16
COM15
COM14
COM13
COM12
COM11
COM10
COM9
COM16
COM15
COM14
COM13
LCD
Segment
— 14 —
EXPLODED VIEW
18
R-1
5
12
6
14
13
11
8
10
7
9
1
15
2
R-2
19
4
R-3
16
4
R-6
17
R-4
R-5
3
— 15 —
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 without 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.
Item
Code No.
Parts Name
Main PCB
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
2
6926 0190 PCB/ASS'Y (MA2, 3M)
IC101
2114 5775 IC/LINEAR (POWER AMP.)
Q101
2250 0168 TRANSISTOR
Q102, Q104/105 2220 1409 TRANSISTOR
Q103
2250 1585 TRANSISTOR
D101
2390 1323 DIODE/SHOTTKY
D102
2390 3018 DIODE
D103
2390 1344 DIODE
D104
2360 2044 DIODE/ZENER
D105
2360 1799 DIODE/ZENER
LED101
2370 0112 LED
J101
3501 7049 JACK (POWER)
J102
3612 0665 JACK (PHONE)
Keyboard PCBs
3
6926 0180 PCB/ASS'Y
D701 - D749
2301 0101 DIODE
Mechanical Parts
4
3831 0770 SPEAKER
5
3335 6556 LCD
6
6926 0270 RUBBER/INTERCONNECTOR
7
6909 5890 SWITCH/SLIDE KONB
8
6921 5031 KNOB
9
6926 0280 RUBBER/BUTTON
10
6926 0290 RUBBER/BUTTON
11
6926 0300 RUBBER/BUTTON
12
6926 0310 RUBBER/BUTTON
13
6922 2720 KEY SET/LT WHITE
14
6922 2730 KEY SET/LT WHITE
15
6922 2740 KEY SET/LT BLACK 10P
16
6922 4000 RUBBER/CONTACT
17
6923 2390 RUBBER/CONTACT
18
6926 0320 PANEL/DISPLAY
19
6926 0020 COVER/BATTERY
Accessory
6906 8752 STAND/NOTE
1
LSI1
LSI2
LSI3
IC1
Q1
VR1
X1
Notes:
Q – Quantity per unit
R – Rank
— 17 —
Specification
M240592*1
MSM6755B-17
UM23C2101M-7384/Q
SED1278F0A
RN5VD40AA-TR
2SC4081T106Q
EVM3SSX50B53
CSACS20.00MX040-TC
Q R
1
1
1
1
1
1
1
1
B
A
A
A
B
B
B
B
M140548*1
TA8248K
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
1
1
1
3
1
1
1
11
1
1
1
1
1
B
A
A
A
A
C
C
C
A
A
C
B
B
M140449*3
1S2473T-77-T
1 C
49 B
B
B
C
B
B
B
B
B
B
A
A
A
A
A
C
B
S10JA13A
LD-B10023A
M440435-2
CSB-12D
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
1
2
1
1
1
1
1
1
3
1
2
1
1
1
1
M340629B*2
1 B
MA0600571A