Casio Electronic Keyboard Ctk 750 Users Manual S/M

CTK-750 to the manual 2b454f62-8c0d-4903-aa66-4c9ab1097b00

2015-01-21

: Casio Casio-Casio-Electronic-Keyboard-Ctk-750-Users-Manual-243279 casio-casio-electronic-keyboard-ctk-750-users-manual-243279 casio pdf

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CTK-750

CTK-750

ELECTRONIC KEYBOARD

CONTENTS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Replacing the DSP (HG51A115A01FD) . . . . . . . . . . . . . . . . . . . . . 2
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Major Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PCB View and Major Check Points . . . . . . . . . . . . . . . . . . . . . . . 16
Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
IC and Transistor Lead Identification . . . . . . . . . . . . . . . . . . . . . 21
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

— 14 —

SPECIFICATIONS
General
Number of Keys:
Polyphonic:
Preset Tones:
Keyboard Controls:
Key Transpose:
Auto-Rhythms:
Auto-Accompaniment:
Magical Preset Variations:

Digital Effects:

Sound/Control Pads:
Pad Variations:
Song Memories:

Registration Memories:
Registration Items:

Tuning Control:
Terminals:
Built-In Speakers:
Power Source:

Auto Power Off:
Power Consumption:
Dimentions:
Weight:
Standard Accessory:

61
32-note
128
Tone Expander: Layer, Split
Touch Response: On/Off
Touch Sensitivity: Light/Middle/Heavy
Range from F# to F by a half-note increment
128
Tempo Control: 40 to 255
CASIO Chord/Fingered/Full-Range Chord
Controller: Variation, Fill-In, Intro/Ending
128; BREAK BEAT
16
MELODYCOMP
8
SHADOW DRUM 4
FREE SESSION 32
TONE STACK
40
KEY SPLIT
12
HYPERACTIVE 16
16; Reverb-1, Reverb-2, Reverb-3, Chorus, Tremplp, Phase Shifter,
Organ SP, Enhancer, Flanger, EQ Loudness, Delay-1, Delay-2,
Analog Delay, Tap Delay, Chorus Reverb, Tremolo Reverb
6
32; Phrases: 10, Drums: 10, SE/Percussion: 10, Controller: 2
2;
Tracks: 6
System: Real-time recording
Memory Capacity: Approx. 5,800 notes
10
Tone Number, Rhythm Number, Tempo, Accompaniment Mode,
Accompaniment Volume, Effects, Layer On/Off, Split On/Off,
Pad Variation, Assignable Jack, Auto-Accompaniment On/Off,
Auto-Accompaniment Controller, MIDI (Channel On/Off, GM On/Off,
Local Control On/Off, Bend Range)
440Hz ± 100 cents
Headphone Jack [Output Impedance: 100 Ω, Output Voltage: 1.7 V(rms)
MAX], Assignable Jack, MIDI Jacks (IN, OUT), AC Adaptor Jack (12V)
12 cm dia. 1.1W Input Rating: 2 pcs.
2-way AC or DC source
AC: AC adaptor AD-12
DC: 6 D size dry batteries
Battery life: Approx. 5 hours by manganese batteries R20P(SUM-1)
Approx. 5 hours by alkaline batteries LR20(AM1)
Approximately 6 minutes after the last operation
18 W
141 x 968 x 411 mm (HWD)
(5-11/16 x 38-1/16 x 16-5/16 inches) (HWD)
7.0 kg (15.5 lbs) excluding batteries
Music stand

—1—

Electrical
Current Drain with 12V DC:
No Sound Output
Maximum Volume
with white keys D2 to D3 pressed in Synth-Bass-2 tone
and in Latin Fusion rhythm at initial setup tempo
Volume; maximum, Touch: maximum
Line Output Level (Vrms with 47 KΩ load each cannel):
with key D4 pressed in FSynth-Bass-2 tone on L-ch
with key G4 pressed in FSynth-Bass-2 tone on R-ch
Phone Output Level (Vrms with 8 Ω load each channel):
with key D4 pressed in FSynth-Bass-2 tone on L-ch
with key G4 pressed in FSynth-Bass-2 tone on R-ch
Speaker Input Level:
with key D4 pressed in FSynth-Bass-2 tone on L-ch
with key G4 pressed in FSynth-Bass-2 tone on R-ch
Minimum Operating Voltage:

390 mA ± 20%
1700 mA ± 20%

850 mV ± 20%
800 mV ± 20%
280 mV ± 20%
260 mV ± 20%
5200 mV ± 20%
5600 mV ± 20%
5.5 V

REPLACING THE DSP (HG51A115A01FD)
Note: To increase productivity ,the DSP HG51A115A01FD is sticked on the main PCB with a double-side
adhesive tape, then its leads are soldered.
Remove the DSP according to the following procedures.
1. Prepare isopropyl alcohol and a flat IC desoldering machine (Spot Heater HS-600).
2. Apply plenty of the alcohol to the adhesive tape from the reverse side of the main PCB. (Fig. 1)
There is a hole on the PCB just under the LSI, and the adhesive tape can be seen through the hole.
3. Leave it more than one minute so that the alcohol weaken adhesive power fully.
4. Using a proper size of nozzle, apply heat to leads of the LSI with the desoldering machine.
5. Grasp the LSI with tweezers, and using gentle force vibrate the tweezers to feel melting solder. (Fig.2)
6. Remove the LSI after meltingsolder at every leads wholly.

Spot Heater HS-600

Alcohl

A
115
51A
HG

I-S
LS

Fig.1

Fig.2

—2—

BLOCK DIAGRAM
7-Segment
LED

LO0 ~ LO4

Keyboard

FI0 ~ FI7
SI0 ~ SI7

LEDs

LED driver
BA612
Gate Array
UPD65005C-578

KC0 ~
KC7

KO0 ~ KO7
LD0 ~ LD7
Buttons

D0~D7

KI1 ~ KI7

CPU

Key Touch LSI

VDD

HD6433298A18P

HG52E35P
A0 ~ A15

POWER

A0 ~ A2

Power Switch

IN
OUT
MIDI

Working Strage
RAM (256K-bit)
HM62256ALP-10

A0 ~ A14

Effect RAM
(256K-bit)
HM62256ALP-10

APO

A0 ~ A3

EA0 ~ EA14

RA0 ~ RA19

DSP

Sound Source ROM
(16M-bit)
TC5316200CP-C081

HG51A115A01FD
ED0 ~ ED7

RD0 ~ RD15

WCK1

SLOP

BCK

D/A Converter
UPD6376CX

VD
Filter

Filter

LVDD
VCC

AVDD

DVDD
VDD

Output

Speakers

Main
Volume

Power Supply Circuit
Q1 ~ Q7

Power Amplifier
LA4620

—3—

CIRCUIT DESCRIPTION
Key Matrix

KC0

KC1

KC2

KC3

KC4

KC5

KC6

KC7

FI0

C2 1

C#2 1

D2 1

D#2 1

E2 1

F2 1

F#2 1

G2 1

SI0

C2 2

C#2 2

D2 2

D#2 2

E2 2

F2 2

F#2 2

G2 2

FI1

G#2 1

A2 1

A#2 1

B2 1

C3 1

C#3 1

D3 1

D#3 1

SI1

G#2 2

A2 2

A#2 2

B2 2

C3 2

C#3 2

D3 2

D#3 2

FI2

E3 1

F3 1

F#3 1

G3 1

G#3 1

A3 1

A#3 1

B3 1

SI2

E3 2

F3 2

F#3 2

G3 2

G#3 2

A3 2

A#3 2

B3 2

FI3

C4 1

C#4 1

D4 1

D#4 1

E4 1

F4 1

F#4 1

G4 1

SI3

C4 2

C#4 2

D4 2

D#4 2

E4 2

F4 2

F#4 2

G4 2

FI4

G#4 1

A4 1

A#4 1

B4 1

C5 1

C#5 1

D5 1

D#5 1

SI4

G#4 2

A4 2

A#4 2

B4 2

C5 2

C#5 2

D5 2

D#5 2

FI5

E5 1

F5 1

F#5 1

G5 1

G#5 1

A5 1

A#5 1

B5 1

SI5

E5 2

F5 2

F#5 2

G5 2

G#5 2

A5 2

A#5 2

B5 2

FI6

C6 1

C#6 1

D6 1

D#6 1

E6 1

F6 1

F#6 1

G6 1

SI6

C6 2

C#6 2

D6 2

D#6 2

E6 2

F6 2

F#6 2

G6 2

FI7

G#6 1

A6 1

A#6 1

B6 1

C7 1

SI7

G#6 2

A6 2

A#6 2

B6 2

C7 2

Note: Each key has two contacts, the first conatct 1 and second contact 2 .

Key

FI
Second contact 2

First contact 1

KC
SI

—4—

Nomenclature of Keys
C#2 D#2

C2

D2

E2

F#2 G#2 A#2

F2

G2

A2

B2

C#3 D#3

C3

D3

E3

F#3 G#3 A#3

F3

G3

A3

F#4 G#4 A#4

C#4 D#4

B3

C4

D4

E4

F4

G4

A4

B4

C#5 D#5

C5

D5

C#6 D#6

F#5 G#5 A#5

E5

F5

G5

A5

B5

D6

C6

E6

F#6 G#6 A#6

F6

G6

A6

B6 C7

Button Matrix

KI1

KI2

KI3

KI4

KI5

KI6

KO0

Split

Layer

Upper 1

Lower 1

Lower 2

Upper 2

KO1

Transpose

Tune

MIDI

Jack

Rhythm

Tone

Play Style

Track 4
Chord 1

Track 5
Chord 2

Track 6
Chord 3

Track 2
Rhythm

Track 3
Bass

KO2

KI7

KO3

3

6

9

Demo

Touch
Responce

Digital
Effect

Resistration

KO4

2

5

8

Track 1

1

4

7

KO5

Accomp.
Volume

Song
Memory

Accomp.

Track

0

-

+

KO6

Synchro/
Ending

Variation
/Fill-In

Normal/
Fill-In

Intro

F

D

B

KO7

Mode

A

C

E

Start/
Stop

Tempo
Down

Tempo
Up

Reset Circuit

VDD

Battery set

VDD

VDD

POWER
From power switch

DSP
HG51A115A01FD

Gate Array
UPD65005C-578

RESET
Reset IC
S8053ANO

DVDD

CPU
HD6433298A18P

-RESET

WR

-SRAM

VDD

Working Strage RAM
HM62256ALP-10

—5—

DVDD
Key Touch LSI
HG52E35

Initial reset
When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU.
The CPU then initializes its internal circuit and clears data in the working strage RAM.
Power ON reset
When the power switch is pressed, the CPU receives a low pulse of POWER signal. The CPU first raises
APO signal to +5V to generat DVDD voltage, then raises RESET signal to +5V. During this period the
gate array, the DSP and the key touch LSI initializes their internal circuit.

CPU (HD6433298A18P)
The 16-bit CPU contains a 32k-bit ROM, a 1k-bit RAM, seven 8-bit I/O ports, an A/D convertor and serial
interfaces. The CPU accesses to the working strage RAM, the DSP and the key touch LSI. The CPU also
controls buttons, LEDs, bender input and MIDI input/output.

Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19, 20
21
22
23 ~ 29
30
31 ~ 38
39
40 ~ 56
48
57 ~ 64

Terminal
P40
P41
P42
P43
P44
P45
P46
P47
TXD
RXD
P52
-RESET
-NMI
VCC
-STBY
VSS
XTAL
EXTAL
MD1, MD0
AVSS
AN0
P71 ~ P77
AVCC
P60 ~ P67
VCC
P27 ~ P10
VSS
P30 ~ P37

In/Out
Out
Out
Out
Out
Out
Out
In
Out
In
Out
In
In
In
In
In
In
In
In
In
In
In
In
Out
In
Out
In
Ijn/Out

Function
KO signal data output
Clock for KO signal data
APO (Auto Power Off) signal output. ON: High, OFF: Low
Read enable signal output
Write enable signal output
Not used.
10MHz clock output
Wait signal input. Connected to +5V.
MIDI signal output
MIDI signal input
Reset signal output
Reset signal input
Power ON signal input.
+5V source
Standby signal input. Connected to +5V.
Ground (0V) source
20MHz clock input
20MHz clock input
Mode selection input. (Internal ROM mode --- MD1: Hight, MD0: Low)
Ground (0V) source for internal DAC
Analog input. Connected to the bender volume.
Button input signal input
+5V source for internal DAC
LED segment signal output
+5V source
Address bus
Ground (0V) source
Data bus

—6—

Gate Array (UPD65005C-578)
Functions of the gate array are;
(1) To decode chip select signals for the working strage RAM, the DSP and the key touch LSI.
(2) To hold the following signals on "Low" during power off.
Read/write enable signals for the DSP and the key touch LSI
10MHz clock for the key touch LSI
(3) To generate button scan / LED drive signals.
The following table shows the pin functions of the gate array.
Pin No.
1
2
3
4
5
6
7
8~9
10 ~ 17
18 ~ 20
21
22
23
24
25
26
27
28 ~ 39
40, 41
42

Terminal
-RESET
-RDAPO
-WRAPO
-LSIS
-HG
PHAPO
-SRAM
KO8 ~ KO9
KO7 ~ KO0

In/Out
In
Out
Out
Out
Out
Out
Out

GND
PHA
-WR
-RD
-APO
KOC
KOD
A15 ~ A4
D0, D1
VDD

In
In
In
In
In
In
In
In
In
In

Out

Function
Reset signal input
Read enable signal output
Write enable signal output
Chip select signal for the DSP
Chip select signal for the key touch LSI
10MHz clock for the key touch LSI
Chip select signal for the working strage RAM
Not used.
Button scan / LED drive signal output
Not used.
Ground (0V) source
10MHz clock input
Write enable signal input
Read enable signal input
APO (Auto Power Off) signal input
KO signal data input
Clock for KO signal data
Address bus
Data bus
+5V source

LSIS
A4 ~ A15

Address decoder

HG
SRAM

D0, D1

RDAPO
RD
WR

Controller

PHA
APO

WRAPO
PHAPO

KOD

Shift register

KO0 ~ KO7

KOC

RESET

—7—

(Chip select sigal for the DSP)
(Chip select signal for the key touch LSI)
(Chip select signal for the working strage RAM)
(Read enable signal controlled by APO)
(Write enable signal controlled by APO)
(10MHz clock for the key touchLSI.
Controlled by APO)
(Button scan / LED drive signal)

Digital Signal Processor (HG51A115A01FD)
Upon receipt of note numbers and their velocities, the DSP reads sound and velocity data from the sound
source ROM in accordance with the selected tone; the DSP can read rhythm data simultaneously when a
rythm pattern is selected. Then it provides 16-bit serial signals containing data of the melody, chord, bass,
and percussion to the DAC. The DSP also adds the selected effect to the sound data using a 256k-bit
RAM.
The following table shows the pin functions of the DSP.
Pin No.
1~8
9, 10
11
12
13
14
15
16
17
18, 19
20
21
22 ~ 25
26
27
28
29 ~ 32
33
34
35 ~ 39
40 ~ 49
52 ~ 57
58
59
60, 61
62 ~ 73
75 ~ 82
74
83
84
85
86
87
88
89
90 ~ 92

Terminal
CD0 ~ CD7

In/Out
In/Out

Function
Data bus
Not used.
Ground (0V) source
16.384MHz clock output
+5V source
Clock input. Connected to terminal CK16.
Not used.
+5V source
Ground (0V) source
16.384MHz clock input/output. Connected to a crystal oscillator.
System control terminal. Single chip system: Open
Chip select signal input
Addess bus
Not used. Connected to ground.
Write enable signal
Read enable signal
Not used.
Reset signal input
Not used. Connected to +5V.
Not used.

GND7
CK16
VCC6
CK0
TCKB
VCC1
GND1
XT0, XT1
SGL
CCSB
CA0 ~ CA3
CE0
CWRB
CRDB

In
Out
In
In
In
In
In/Out
In
In
In
In
In
In

RESB
TESB

In
In

RD0 ~ RD15

In

RA23
RA22
RA20, RA21

Out
Out
Out

Not used.
Chip select signal for the sound source ROM
Not used.

RA0 ~ RA19

Out

Data bus for the sound source ROM

GND5
WOK2
VCC3
GND3
WOK1
SOLM
SOLP
BOK

In
Out
In
In
Out
Out
Out
Out

Ground (0V) source
Word clock output. Not used.
+5V source
Ground (0V) source
Word clock for the DAC
Serial data output. Not used.
Serial data output for the DAC
Bit clock output for the DAC
Not used.

Data bus for the sound source ROM

—8—

Pin No.
93
94, 95
97 ~ 105
107,109
110, 112
96
106
108
111
113 ~ 117
118
119
120 ~ 122
123 ~ 130
131
132 ~ 134
135, 136

Terminal
VCC5

In/Out
In

Function

EA0 ~ EA14

Out

Address bus for the effect RAM

EWEB
EOEB
VCC7
ECEB

Out
Out
In
Out

VCC4
GND4

In
In

ED0 ~ ED7
GND5

In/Out
In

Write enable signal output for the effect RAM
Read enable signal output for the effect RAM
+5V source
Chip select signal output for the effect RAM
Not used.
+5V source
Ground (0V) source
Not sued.
Data bus for the effect RAM
Ground (0V) source
Not used. Connected to ground.
Not used.

+5V source

Block diagram of DSP and DAC circuit

Sound Source ROM
TC5316200CP-C081
CE

RA22

A0 ~ A19

D0 ~ D15

RA0 ~
RA19

RD0 ~
RD15

SOLP: Sound data
BOK: Bit clock
WOK1: Word clock

D0 ~ D7

SOLP
DSP

A0 ~ A3

HG51A115A01FD

LSIS
RDAPO
WRAPO
RESET

PG
16.384MHz

ED0 ~
ED15

EA0 ~
EA14

D0 ~ D15

A0 ~ A14

Effect RAM (256K-bit)
HM65256BLP

—9—

BOK

CLK

WOK1

LRCK

UPD6376CX

ECEB EOEB EWEB

CS OE WE

DAC
SI

ROUT

LOUT

DAC (UPD6376CX)
UPD6376CX is a two-channel 16-bit Digital to Analog Convertor consisting of resistor string, output
amplifier and zero offset circuit.

Pin No.

Terminal

In/Out

Function

1

SEL

In

Mode selection terminal. Connected to ground.

2
3

D.GND
NC

In

Ground (0V) source for internal digital circuit
Not used.

4

DVDD

In

+5V source for internal digital circuit

5

A.GND

In

Ground (0V) source for internal analog circuit

6

R.OUT

Out

Sound waveform output

7
8
9
10
11
12
13
14
15
16

A.VDD
A.VDD
R.REF
L.REF
L.OUT
A.GND
LRCK
LRSEL
SI
CLK

In
In
In
In
Out
In
In
In
In
In

+5V source for internal analog circuit
+5V source for internal analog circuit
Reference voltage terminal. Connected to a capacitor.
Reference voltage terminal. Connected to a capacitor.
Left channel sound waveform output
Ground (0V) source for internal analog circuit
Word clock (L/R separation signal) input.
Not used. Connected to ground.
Sound data input
Bit clock input

Key Touch LSI (HG52E35P)
By counting the time between first-key input signal FI and second-key SI from the keyboard unit, the key
touch LSI detects key velocity of 256-step. Then the LSI sends the CPU the note number and its velocity
data.
Key touch LSI
HG52E35P

Keyboard

KC0
Key scan signal

~

KC

KC7
First contact
FI0
SI0

FI
SI
Second contact

RESB
CCSB
CWRB
CRDB
CKI

Reset signal from the CPU
Chip select signal from the gate array
Read enable signal from the gate array
Write enable signal from the gate array
Clock from the gate array

CD0
Data bus

Key input signal

CD7

FI7
SI7

CA0 ~ CA2

— 10 —

Address bus

The following table shows the pin functions of the key touch LSI.
Pin No.
1
2, 3
4
5
6
7
8, 9
10
11
12
13, 14
15
16
17
18
19
20 ~ 23, 25 ~ 28
24
29 ~ 31
32
33 ~ 39, 41 ~ 43
53 ~ 55, 57 ~ 63
40
44 ~ 47, 49 ~ 52
48, 56
64

Terminal
REQB
FI10, SI10
VCC
CRDB
CWRB
CCBB
T, STBY
RESB
W
CKI
TMD, TST
CKO
GND
XIN
XOUT
TRES
CD0 ~ CD7
GND
CR0 ~ CR2
VCC
FI0 ~ FI9,
SI0 ~ SI9
VCC
KC0 ~ KC7
GND
VCC

In/Out
Out
In
In
In
In
In
In
In
In
In
In
Out
In
In
Out
In
In/Out
In
In
In
In

Function
Interrupt request. Not used.
Key input signal
+5V source
Read enable signal
Write enable signal
Chip select signal
Not used. Connected to +5V.
Reset signal
Not used. Connected to +5V.
10 MHz clock input
Not used. Connected to ground.
Not used.
Ground (0V) source
Not used. Connected to ground.
Not used.
Not used. Connected to ground.
Data bus
Ground (0V) source
Address bus
+5V source
Key input signal

In
Out
In
In

+5V source
Key scan signal
Ground (0V) source
+5V source

Filter Block
Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the
waveforms.
AVDD

AVEE

2SC1740SQ
10V22µ

10K

C104(H)
10V22µ

1K

+

1K

From the DAC

1K

AG

1K

C182(H)

M5218APR

C152(H)

To main volume

AG

— 11 —

AG

Power Amplifier (LA4620)
The power amplifier is a two-channel balanced amplifier with standby switch. The following figure shows
the internal diagram of the amplifier.
Internal Diagram of LA4620

IN11+

3

IN11-

5

IN12-

4

Input
Amp.
-

RL Short
Protector

Input
Amp.

9

IN21-

7

IN22-

8

Power
Amp.

Pre-drive
Amp.

Terminal
Protection
Circuit

6

IN21+

Power
Amp.

Pre-drive
Amp.

+

PriGND

19

Boot11

20

OUT11

21

PoGND1

22

OUT12

23

Boot21

1

VCC1

18

Boot21

17

OUT21

15

PoGND2

14

OUT22

12

Boot22

+

Pop Noise
Prevention
Circuit

Ripple
Filter

+
Input
Amp.

Pre-drive
Amp.

Power
Amp.

RL Short
Protector

Input
Amp.

Pre-drive
Amp.

Power
Amp.

+

16
NC

2

10

11

13

DC

MUTE

VCC2

ADJ

Power Supply Circuit
The power supply circuit generates six voltages as shown in the following table. VDD voltage is always
generated. The others are controlled by APO signal from the CPU.

Name
VDD
DVDD
AVDD
LVDD
VCC
VD

Voltage
+5.1V
+5.3V
+5.2V
+5.2V
+12V
+12V

For operation of
CPU, Reset IC, Gate array, Working strage RAM
DSP, Key touch LSI, Sound source ROM, Effect RAM, DAC
DAC, Filter
LED driver
Pilot lamp
Power amplifier

— 12 —

FI3
SI3
SI2
SI1
SI0
FI0
FI2
FI1

KC7
KC6
KC5
KC4
KC3
KC2
KC1
KC0

SI4
FI4
KC5
KC4
KC3
KC2
KC1
KC0

FI7
FI6
FI5
SI7
SI6
SI5
KC7
KC6

CA8
CA7
CA6
CA5
CA4
CA3
CA2
CA1

CB8
CB7
CB6
CB5
CB4
CB3
CB2
CB1

CC8
CC7
CC6
CC5
CC4
CC3
CC2
CC1

CD8
CD7
CD6
CD5
CD4
CD3
CD2
CD1

JE5
JE4
JE3
JE2
JE1
AG
LMELO OUT
RMELO OUT
RMELO IN
LMELO IN

W
O

PR

M615T-KY1M

— 13 —

Green

A5712-MA1M
Yellow

PS

M5172-MA2M
Main Volume
FI1
FI2
FI0
SI0
SI1
SI2
SI3
FI3

CC1
CC2
CC3
CC4
CC5
CC6
CC7
CC8
KC0
KC1
KC2
KC3
KC4
KC5
KC6
KC7

Blue

BK
R
JE5
JE4
JE3
JE2
JE1
CD1
CD2
CD3
CD4
CD5
CD6
CD7
CD8

CB1
CB2
CB3
CB4
CB5
CB6
CB7
CB8
KC0
KC1
KC2
KC3
KC4
KC5
FI4
SI4

Red

JG1
JG2
JG3
JG4
JG5
JG6
JG7
JG8
JG9
JG10
JG11
JG12
JG13

JH1
JH2
JH3
JH4
JH5
JH6
JH7
JH8
JH9
JH10
JH11
JH12
JH13

DVDD
BENDER
DG

LG
PWLD
KO7
KO6
KO5
KO4
KO3
KO2
KO1
KO0
POWER
KI1
KI2

KI3
KI4
KI5
KI6
KI7
La
Lb
Lc
Ld
Le
Lf
Lg
Lp

JG1
JG2
JG3
JG4
JG5
JG6
JG7
JG8
JG9
JG10
JG11
JG12
JG13

JH1
JH2
JH3
JH4
JH5
JH6
JH7
JH8
JH9
JH10
JH11
JH12
JH13

Bender
Volume

JF3
JF2
JF1

WIRING DIAGRAM

M5712-CN1M

CA1
CA2
CA3
CA4
CA5
CA6
CA7
CA8
KC6
KC7
SI5
SI6
SI7
FI5
FI6
FI7

PR

M615T-KY2M
W
BL

MAJOR WAVEFORMS

— 14 —

— 15 —

PCB VIEW and MAJOR CHECK POINTS

28

1

27

26

24

25

29

22

14 15 16 17

23

13

19

12
— 16 —

20 21

2

18

6

3

5

4

7

8

9 10 11

SCHEMATIC DIAGRAMS
Main PCB M5712-MA1M

7
23
11.4

25

5.3

5.2

11.6

11.6

5.9

10.9

2.6

2.6

3.2

21
18 19 20

2.6
0.0

11.6

5.3

0.7

2.6

10.9

24

0.0

22

5.2
2.6

5.2

0.0
2.6

2.6

5

3.2
2.6

5.1

11.8
11.0

5.8

1

13

5.2

12
3.4

14 15
6

16 17

4
29 28
0.7

27
5.3

2

8

0.0

26
3

— 17 —

9 10 11

Console PCB M5712-CN1M

— 18 —

Keyboard PCBs M615T-KY1M, KY2M

— 19 —

EXPLODED VIEW

— 20 —

IC LEAD IDENTIFICATION AND INTERNAL DIAGRAM

LRSEL/RSI 14
SI/LSI 15
CLK 16

TIMING
GENERATOR

LRCK 13

SHIFT REGISTER
LATCH

UPD6376CX

4/8 fs SEL 1

MAIN DAC

11 L.OUT

SUB DAC

10 L.REF

SUB DAC

9 R.REF

MAIN DAC

6 R.OUT

D.GND 2
3
N.C.

4
D.VDD

5
12
A.GND

8

7
A.VDD

S8053ANO

VDD 2

1 OUT

VSS 3

1

2

3

M5218APR

TC74HC04AP

PC900V
VCC

8

1A 1

14 VCC

1Y 2

13 6A

2A 3

12 6Y

2Y 4

11 5A

3A 5

10 5Y

3Y 6

9 4A

GND 7

8 4Y

7

6

5

3

GND
4

GND

6

5

1

2

4

VCC
+
+
1

— 21 —

2

NC

3

Q4: 2SB1274

Q2: 2SD1762E,F

B

C

Q1/6: 2SB1240Q,R

E

B

E

C

C

E

Q3, Q5, Q7, Q11/12: 2SC1740SQ
Q13: 2SA933SQ
Q14~21: DTA114TS

E

B

— 22 —

C

B

PARTS LIST
CTK-750

Notes:

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
separately.
3. The numbers in item column correspond to the same
numbers in drawing.

N

N
N
N
N
N

N
N

N

N
N

Item

Code No.

Parts Name

Specification

PCB Ass'y M5712-MA1M
2010 4928 LSI
HM65256BLP-10
2011 3325 LSI
UPD6376CX
2011 5194 LSI
HG52E35P
2011 5201 LSI
HG51A115A01FD
2011 5810 LSI
UPD43256AC-85L,10L
2011 6867 LSI
UPD65005C-578
2011 7196 LSI
TC5316200CP-C081
2011 7203 LSI
HD6433298A18P
2105 2219 IC
S-8053ANO
2105 3164 IC
HD74HC04P
2114 1421 Photo-coupler
PC900V
2114 1799 IC
M5218APR
2114 1883 IC
LA4620
2250 0441 Transistor
2SA1267Y-AT-T
2251 0140 Transistor
2SB1240Q,R-TV6-T
2251 0672 Transistor
2SB1548-P.CS
2252 0497 Transistor
2SC3199Y-AT-T
2253 0455 Transistor
2SD1762E,F
2259 1883 Digital transistor
DTA114TS-TP-T
2360 1729 Zener diode
MTZJ5.1AT-77-T
2360 1946 Zener diode
MTZJ5.6CT-77-T
2360 2254 Zener diode
HZS6B2LTD-T
2360 2261 Zener diode
RD5.1JSB3-T1-T
2390 0371 Diode
DSK10B-BT-T
2390 1323 Diode
RB100A-T32-T
2390 1344 Diode
1SS133T-77-T
2390 1463 Schottky diode
SB20-03B
2590 1519 Crystal oscillator
HC-49U16384
2590 1547 Ceramic oscillator
EFO-EC2005C4
2606 1141 Carbon film resistor
R-20-1K-J-T23-T
2606 1148 Carbon film resistor
R-20-220-J-T23-T
2606 1155 Carbon film resistor
R-20-330-J-T23-T
2606 1162 Carbon film resistor
R-20-10-J-T23-T
2606 1169 Carbon film resistor
R-20-100-J-T23-T
2606 1176 Carbon film resistor
R-20-100K-J-T23-T
2606 1183 Carbon film resistor
R-20-10K-J-T23-T
2606 1197 Carbon film resistor
R-20-22-J-T23-T
2606 1232 Carbon film resistor
R-20-82-J-T23-T
2606 1253 Carbon film resistor
R-20-4.7K-J-T23-T
2606 1302 Carbon film resistor
R-20-270-J-T23-T
2606 1309 Carbon film resistor
R-20-470-J-T23-T
2606 1323 Carbon film resistor
R-20-56K-J-T23-T
2606 1330 Carbon film resistor
R-20-68K-J-T23-T
2606 1337 Carbon film resistor
R-20-1M-J-T23-T
2606 1358 Carbon film resistor
R-20-3.3K-J-T23-T
2606 1372 Carbon film resistor
R-20-33K-J-T23-T
2606 1428 Carbon film resistor
R-20-5.6K-J-T23-T
2606 1435 Carbon film resistor
R-20-560-J-T23-T
2606 1491 Carbon film resistor
R-20-6.8K-J-T23-T
2606 1694 Carbon film resistor
R-20-68-J-T23-T
2606 1708 Carbon film resistor
R-20-47-J-T23-T
2606 1722 Carbon film resistor
R-20-2.2-J-T23-T
2606 1757 Carbon film resistor
R-20-6.8-J-T23-T
2800 9091 Electrolytic capacitor
25RE2-220-T2-T
Notes: N – New parts
M – Minimum order/supply quantity
R – Rank
— 23 —

Q M

1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
5
1
8
1
1
1
1
3
1
5
1
1
1
16
4
1
5
33
9
7
8
2
2
1
36
22
1
1
3
11
2
1
1
2
4
4
4
1

1
1
1
1
1
1
1
1
1
1
1
1
1
10
10
10
10
1
10
10
10
10
10
10
10
20
5
1
5
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
10

FOB Japan
N.R.Yen
Unit Price

R

*

720
230
600
2,820
620
220
1,230
880
60
28
210
38
350
9
10
44
9
47
10
8
8
9
9
11
29
3
39
100
64
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
33

A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
B
B
B
B
C
C
C
C
B
B
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C

H
C
F
T
F
C
N
J
B
A
C
A
D
A
A
A
A
A
A
A
A
A
A
A
A
A
A
B
B
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A

N

Item

Code No.

Parts Name

Specification

2802 9231 Electrolytic capacitor
25RE3-2200-S1
2803 6743 Electrolytic capacitor
50RBP2-R22-T2-T
2803 6750 Electrolytic capacitor
50RBP2-R33-T2-T
2803 6757 Electrolytic capacitor
50RBP2-4R7-T2-T
2805 3061 Electrolytic capacitor
6.3RE2-220-T2-T
2805 3134 Electrolytic capacitor
10RE2-22-T2-T
2805 3142 Electrolytic capacitor
16RE2-10-T2-T
2807 1015 Electrolytic capacitor
16RE2-47-T2-T
2807 1040 Electrolytic capacitor
6.3RE2-470-T2-T
2807 1082 Electrolytic capacitor
16RE2-100-T2-T
2807 1091 Electrolytic capacitor
6.3RE2-100-T2-T
2813 1722 Semiconductive capacitor
DD407SR104K16-T
2813 2597 Ceramic capacitor
RT-HE40TKCH080D-T
2813 3283 Ceramic capacitor
UP050F104Z-A-B
N
2813 3381 Semiconductive capacitor
DD404SR152K16-T
N
2813 3388 Semiconductive capacitor
DD404SR182K16-T
2818 0446 Ceramic capacitor
RT-HE40TKYB101K-T
2818 3275 Ceramic capacitor
RT-HE40TKCH220J-T
2830 6229 Mylar capacitor
AMZV-104K50-T
2845 0168 Module capacitor
CNB8X101K
2845 3213 Three-polarity capacitor
EXC-ECT223ZVT-T
2845 3220 Ferrite beads
EXC-ELDR35V-T
3025 0826 EMI filter
EXC-EMT222DT-T
3501 4816 DIN jack
YKF51-5051
3501 5012 DC jack
HEC2305-01-920
3501 7651 Connector
S8B-PH-K-E
3501 7658 Connector
S8B-PH-K-M
3501 7665 Connector
S8B-PH-K-R
3501 7672 Connector
S8B-PH-K-Y
3612 0711 Miniature jack
YKB21-5101
3612 0789 Jack
YKB21-5010
3719 2695 Heat sink
OSH2742-L25-SP
3719 4032 Heat sink
UOT-10CS25-SPL
3841 0539 Inductor
ELE-V100KR-T
3841 0819 Common mode coil
PLT09H-2003R
N
4317 4242 Blank PCB M5712-MA1M
M211741B-1
N
6922 4200 PCB ass'y M5712-MA1M
M211743*1
PCB Ass'y M5712-MA2M
2765 1211 Slide volume
EWA-MJCC20B23
N
JE
3719 4214 Ribbon cable M712B
DF5H05070-8000M
N
4317 4262 Blank PCB M5712-MA2M
M211741B-2
N
6922 4230 PCB ass'Y M5712-MA2M
M312162*1
PCB Ass'y M5712-CN1M
2114 3318 IC
BA612
2370 0343 LED
LN28RPX-(TT)
2370 0952 LED
LB-603VP1
2370 0959 LED
LN882RPX-(TT)
2390 1344 Diode
1SS133T-77-T
N JH/JG 3719 4207 Ribbon cable M712A
DF5H13130-8000M
N
4317 4250 Blank PCB M5712-CN1M
M211742-1
N
6922 4220 PCB ass'y M5712-CN1M
M211744*1
PCB Ass'y M615T-KY1M
2301 0101 Diode
M111224-1
CA
3501 7588 8P connector MHTRASKA
DS-8P-46-MHTRASKA
CB
3501 7595 8P connector MHTRASKB
DS-8P-46-MHTRASKB
Notes: N – New parts
M – Minimum order/supply quantity
R – Rank
— 24 —
N
N
N

Q M
2
2
2
2
1
10
2
2
3
8
6
2
1
22
2
2
22
2
6
3
2
20
3
1
1
1
1
1
1
1
1
1
1
2
1
1
1

10
20
20
20
10
20
20
10
10
10
20
20
20
20
20
20
20
20
10
5
10
10
10
1
10
10
10
10
10
5
5
1
5
20
1
1
1

1 1
1 20
1 5
1 1

FOB Japan
N.R.Yen
Unit Price
75
16
16
18
26
14
14
20
27
27
18
9
5
8
5
5
4
5
13
58
14
12
21
110
25
25
25
25
25
90
60
150
65
26
140
700
11,110

R

*

C A
C A
C A
C A
C A
C A
C A
C A
C A
C A
C A
C A
C A
C A
C A
C A
C A
C A
C A
C B
C A
C A
C A
C A
A A
C A
C A
C A
C A
B A
B B
C B
C B
C A
C B
C G
B CC

110
16
8
360

A
C
C
C

B
A
A
D

1
15
1
2
53
2
1
1

5
20
1
20
20
10
1
1

98
16
240
27
3
36
420
1,690

A
C
C
C
C
C
C
B

B
A
C
A
A
A
D
P

64
1
1

1
1
1

8
110
130

C
C
C

A
B
B

N

Item

CC
CD

1
2
3
4
5
6
7
8
9
10

N

11
12

N
N
N
N
N
N

13
14
15
16
17
18
19
20
21
22
23
24
25
26

N

N

N

27

Code No.

Parts Name

Specification

Q M

3637 5220 Ferrite core
ZCAT2032-0930
4317 3820 Blank PCB M615T-KY1M
M111575-1
6921 8590 PCB ass'y M615T-KY1M
M111608*1
6921 9460 Sponge 60x400
M412219-1
PCB Ass'y M615T-KY2M
2301 0101 Diode
1S2473T-77-T
3501 7602 8P connector MHTRASKD
DS-8P-48-MHTRASKC
3501 7609 8P connector MHTRASKD
DS-8P-48-MHTRASKD
3637 5220 Ferrite core
ZCAT2032-0930
4317 3830 Blank PCB M615T-KY2M
M111576-1
6921 8600 PCB ass'y M615T-KY2M
M111609*1
6921 9460 Sponge 60x400
M412219-1
Keyboard
6920 7581 TR white key set CEGB
M111223A-1
6920 7591 TR white key set DFAS
M111222A-1
6920 7601 TR white key set DFA
M111221A-1
6920 7611 TR black key set 10P
M111220A-1
6920 7621 TR black key set 5P
M111220A-2
6920 7560 PET-TAC-TR29
M111224-1
6920 7570 PET-TAC-TR32
M111225-1
6921 8610 KB chassis HTRASK61GD
M111547-1
6921 8621 Upper stopper HTRASK
M412168A-1
6921 8631 Lower stopper HTRASK
M412169A-1
Bender
2765 1141 Volume
RK1631110-50KB
3719 4270 Ribbon cable M712D
DF0H03390-35353535
6909 2170 Bender knob
M31488-2
6911 5241 Bender chassis A
M31487A-1
6911 5250 Bender chassis B
M41946-1
6911 5260 Bender spring
M41949-1
6911 5390 Felt 152A
M42037-1
6921 0550 Felt 5X13
M412026-1
6922 4760 Felt D
M4382-4
Upper Case
6922 4301 Upper case sub ass'y
M111786A*1
6921 5040 Slide volume knob 601
M311860-1
6922 4270 Panel 712
M312134-1
3831 0672 Speaker
12G30BFB
6922 4310 Rubber button 712A
M312131-1
6922 4320 Rubber button 712B
M312132-1
6922 2660 Rubber button 710C
M312088-1
6922 2680 Rubber button 710D
M312082-2
6922 3830 Rubber button 711A
M312122-1
6922 3840 Rubber button 711B
M312123-1
6922 3860 Rubber button 711F
M211727-1
6922 3870 Rubber button 711D
M312125-1
6922 3880 Rubber button 711D
M312125-2
6922 3890 Rubber button 711E
M312126-1
3035 0315 Ferrite core
BP59RB140070N0M
3719 2422 Ribbon cable M288S
DF5H02260-35353535
3719 4046 Ribbon cable M584R
DF0H02300-35353535
6922 5420 Sponge 42X68
M411740-2
6910 9170 Sponge 84
M41661-1
Lower Case
6922 4281 Lower case sub ass'y
M111787A*1
Notes: N – New parts
M – Minimum order/supply quantity
R – Rank
— 25 —

1 1
1 1
1 1
1 10
58 20
1 1
1 1
1 1
1 1
1 1
1 10

FOB Japan
N.R.Yen
Unit Price
170
260
870
50

R

*

C
C
B
C

B
C
I
A

8
110
110
170
210
850
50

C
C
C
C
C
B
C

A
B
B
B
C
I
A

5
1
4
2
1
1
1
1
1
1

1
1
1
1
1
1
1
1
1
1

180
180
160
230
150
350
370
650
130
110

C
C
C
C
C
C
C
C
C
C

C
C
B
C
B
D
D
G
B
B

1
1
1
1
1
1
1
2
1

1
10
10
10
10
10
10
20
20

190
29
47
45
16
15
8
6
6

C
C
C
C
C
C
C
C
C

C
A
A
A
A
A
A
A
A

1
1
1
2
1
1
1
5
1
1
1
1
1
1
2
1
1
2
2

1
10
1
1
1
1
1
10
10
10
1
5
5
5
10
20
20
20
20

2,710
13
120
330
130
70
97
29
31
32
130
72
73
73
39
23
20
22
14

C
B
C
B
B
B
B
B
B
B
B
B
B
B
C
C
C
C
C

T
A
B
D
B
B
B
A
A
A
B
B
B
B
A
A
A
A
A

1,820

C

Q

1 1

N

N
N
N

Item

Code No.

27-1
27-2
27-3

6902 6140
6903 2150
6919 3190
6917 9300
6920 2290
6921 5490
6922 4290
6918 1634
Screws
0009 2680
0009 2682
5111 2571
0009 5791
6919 0420
0009 6417
5111 2679
0009 2698
Accessory
6920 8691

28
29
30
31
32
33
34
35
36
37

Notes:

Parts Name

Specification

Battery spring 90
Battery spring B
Key damper 61
Rubber foot
Clip
Sponge 425X54
Packing 845X22
Battery cover sub ass'y

M41226-1
M41330-1
M411615-1
M41109-3
CS-3
M412141-1
M412281-2
M311164D*1

Screw
Screw
Screw
Screw
Screw
Screw
Screw
Screw

4x8
2.6 x 8
3x8
3 x 20
3x8
4 x 10
3x8
3 x 14

Music stand 590

M311760A-1

N – New parts
M – Minimum order/supply quantity
R – Rank
— 26 —

Q M

FOB Japan
N.R.Yen
Unit Price
27
18
55
6
9
44
65
200

R

*

B
B
B
C
C
C
C
B

A
A
A
A
A
A
B
C

1
1
1
5
2
1
2
1

10
10
5
20
20
10
5
1

10
20
8
15
6
20
38
16

50
50
50
50
50
50
50
50

2
2
2
2
2
2
2
2

C
C
C
C
C
C
C
C

A
A
A
A
A
A
A
A

1

1

130

C

B

MA0300941A



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File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.2
Linearized                      : Yes
Create Date                     : 1997:09:15 16:17:14
Producer                        : Acrobat Distiller 3.0 for Power Macintosh
Keywords                        : EMI
Subject                         : MAR.94
Creator                         : Adobe PageMaker 6.0J
Title                           : S/M CTK-750
Author                          : MAS
Modify Date                     : 1998:03:05 14:37:48
Page Count                      : 30
Page Mode                       : UseOutlines
EXIF Metadata provided by EXIF.tools

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