Casio CTK-450 User Manual

R

CTK-450

(with price)

ELECTRONIC KEYBOARD

CTK-450

CONTENTS

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

DISASSEMBLE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

CIRCUIT DESCRIPTION

Key and Switch Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

CPU (MSM6567-15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Filter Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Mute Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Power Amplifier (LA4598) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Power Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

PCB VIEW AND MAJOR WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . 10

EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

IC AND TRANSISTOR LEAD IDENTIFICATIONS . . . . . . . . . . . . . . . . 13

PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

SPECIFICATIONS

General

Number of Keys: 61
Polyphonic: 16-note
Preset Tones: 64
Auto-Rhythms: 64
Auto-Accompaniment: CASIO Chord/Fingered
Auto-Play Tunes: Songs: 32 (Melody ON/OFF)

Free Sessions: 32

Terminals: PHONE/OUTPUT Jack [Output Impedance: 40 Ω, Output Voltage:

3.5V(rms)MAX], AC Adaptor Jack (DC9V)
Built-In Speakers: 10 cm dia. 1.5W Input Rating: 1 pec.
Power Source: 3-way AC or DC source

AC: AC adaptor AD-5
DC: 6 D size dry batteries
Battery life: Approx. 2 hours (SUM-3/R6P)

Approx. 4 hpurs (AM-3/LR6)

Car battery: Required optional car adaptor CA-5
Auto Power Off: Approx. 6 minutes after the last operation
Power Consumption: 7.0 W
Dimentions: 86 x 920 x 291 mm (HWD)

(3-3/8 x 36-1/4 x 11-7/16 inches) (HWD)
Weight: 3.5 kg (7.7 lbs) excluding batteries
Standard Accessory: Music stand, Song book

Electrical

Current Drain with 9V DC:
No Sound Output 130 mA ± 20%
Maximum Volume 400 mA ± 20%

with keys C3 to C4 pressed in Clarinet tone,
Volume; Maximum

Line Output Level (Vrms with 47 KΩ load each cannel): 650 mV ± 20%

with key C6 pressed in Clarinet tone

Phone Output Level (Vrms with 8 Ω load each channel): 120 mV ± 20%

with key C6 pressed in Clarinet tone

Speaker Input Level: 1400 mV ± 20%

with key C6 pressed in Clarinet tone

Minimum Operating Voltage: 5.7 V

— 1 —

DISASSEMBLE INSTRUCTIONS

Note: The keyboard PCBs are fixed to the case by springy clicks instead of by screws.

To disassemble keyboard PCBs

1. Using gentle force, press a click to release the PCB from the click.
A click can be caught in the slit behind of it, or can be deformed if too much force is used.
When a click is caught in the slit, return it to original position with a tweezers.

2. Release the clicks one by one from an end to another along the PCBs.

3. Take off the PCBs.

To reassemble the keyboard PCBs

1. Before assembling the PCBs, check that all clicks are free, and properly aligned.

2. Set the PCBs in the bumps opposite to the clicks.

3. Press down the PCBs until clicking.
When clicks are deformed, screw the PCBs on the case.

The screw is available from our spare parts center.
Code No. 0009 2682 Screw 2.6 x 8

— 2 —

Output Jack

BLOCK DIAGRAM

Reset IC

S-8053ANO

KO0~KO14

— 3 —

Speaker

VCC +9V

Amplifier

LA4598

AVDD +5V

Power Supply Circuit

T1/T2/T3

VDD +5V

Main Volume

T6

(APO)

Mute Circuit
M5218APR

Filter

T4/T5

LEDX6

CPU

MSM6567-15

Oscillator

KI0~KI7

Keyboard

Switches

Key and Switch Matrix

0IK1IK2IK3IK4IK5IK6IK7IK

CIRCUIT DESCRIPTION

0OK

rewoP

FFO

2C2#C2D2#D2E2F

1OK yalP2#F2G2#G2A2#A2B

2OK deregniF3C3#C3D3#D3E3F

3OK

OISAC
drohC

3#F3G3#G3A3#A3B

4OK gnoS4C4#C4D4#D4E4F

5OK 4#F4G4#G4A4#A4B

6OK 5C5#C5D5#D5E5F

7OK 5#F5G5#G5A5#A5B

8OK 6C6#C6D6#D6E6F

9OK 6#F6G6#G6A6#A6B

01OK 7C43210

11OK

21OK

opmeT

nwoD

opmeT

pU

31OK

41OK

Nomenclature of Keys

C#2

C2 D2E2F2G2A2 B2 C3 D3

F#2D#2

C#3A#2G#2

.pmoccA

1emuloV

765

).niM(

.pmoccA

2emuloV

.pmoccA

3emuloV

enoTmhtyhR

.pmoccA

4emuloV

)xaM(

F#3 G#3

D#3

E3

F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5

A#3 C#4 D#4

F#4 G#4

A#4

C#5

D#5

ydoleM

FFO/NO

F#5 G#5

A#5

/tratS

potS

C#6

C6

/cnyS

ni-lliF

G#6F#6D#6

A#6

B6A6G6F6E6D6

C7

— 4 —

CPU (MSM6567-15)

Containing sound data ROM and DAC (Digital to Analog Convertor), the CPU provides sound waveform in
accordance with the pressed key and the selected tone.
The following table shows pin function of the LSI.

Pin No. Terminal In/Out Function

1 LEDY0 Out Not used.
2 LVDD1 In +5V source
3 LGND2 In Ground (0V) source

4 ~ 9 LEDX0 ~ LEDX5 Out Not used.

10 LEDX6 Out APO(Auto Power Off) signal output ON: "H" OFF: "L"
11 LEDX7 Out Not used.
12 LVDD2 In +5V source

13 ~ 27 Not used.

28 GND2 In Ground (0V) source
29 COSI In 43.45MHz clock pulse input

30 COSO Out 43.45MHz clock pulse output
31 VDD In +5V source
32 GND2 In Ground (0V) source

33 ~ 35 TEST1 ~ TEST3 Not used. Connected to ground.

36 MI In Not used. Connected to +5V.
37 -RESET In Reset signal input

38 AVDD In Ground (0V) source for internal DAC
39 OUT Out Sound waveform output

40 AGND In Ground (0V) source for internal DAC
41 ~ 48 KI0 ~ KI7 In Input terminals for keys and switches
49 ~ 63 KO0 ~ KO14 Out Key and switch scan signal output
64 ~ 72 Not used.

73 LGND1 In Ground (0V) source
74 ~ 80 Not used.

— 5 —

Filter Block

Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the
waveform.

CPU

MSM6567-15

To mute circuit

Mute Circuit

The mute circuit removes noise from the sound signal just before the signal fades away. The circuit
detects amplitude of the decaying sound signal by amplifing it by 1000 times, and transistor T6 flows the
signal into the ground when the amplitude decays almost zero.

+0.5V at the minimum amplitude (no sound)

-2.7V at the maximum amplitude

Sound signal from filter block

To main volume

— 6 —

Power Amplifier (LA4598)

LA4598 is a 2-channel power amplifier with stand-by switch.
The following table shows the pin functiion of the power amplifier.

Pin No. Terminal In/Out Function

1 Power GND In Ground (0V) source
2 Ch1 B.S. Terminal for bootstrap capacitor

3 Ch1 OUT Out Channel 1 output
4 VCC In +9V source

5 Ch1 N.F. In Negative feedback input
6 Ch1 IN In Channel 1 input

7 D.C. Terminal for decoupling capacitor
8 Pre GND In Ground (0V) source

9 Stand by In Power control signal input. 0V: OFF, +9V: ON

10 Ch2 IN In Channel 2 input
11 Ch2 N.F. In Negative feedback input

12 Ch2 OUT Out hannel 2 output
13 Ch2 B.S. Terminal for bootstrap capacitor

14 NC Not used.

Block Diagram

D.C.

6

5

8

7

Input
Amp.

Bias circuit

Pre-drive
Amp.

TSD protector

Ch1 IN

Ch1 NF

Pre GND

Power
Amp.

Stand by

2

CH2 BS

3

CH1 OUT

POWER GND

1

4

VCC

9

STAND BY

Ch2 IN

CH2 NF

10

11

Input
Amp.

Pre-drive
Amp.

— 7 —

Power
Amp.

CH2 OUT

12
13

CH2 BS

Power Supply Circuit

The power supply circuit generates three voltages - VDD (+6.0V) for the CPU and the reset IC, AVDD
(+6.0V) for the analog circuit, and VCC1 (+8.6V) for the pilot lamp and the power amplifier.
When turning power on, the 100µ capacitor makes transistor T2 on first then the CPU provides transistor
T2 "High" of APO signal to keep it being on.

HOW TO GET POWER IN OPENING TOP PANEL

1. Remove the mode switch contact from the top panel.

2. Make short-circuit A and B with a wire as shown below.

3. Connect an AC adaptor to the DC jack.

4. Place the contact on carbon paint of the mode switch.

5. Align the contact onto OFF position.

6. Slide the contact to PLAY position so that the pilot lamp lights up.

7. Take the contact off the carbon paint.
The unit will operate until disconnecting the AC adaptor or automatic power off, and it sounds at full

volume.

A

— 8 —

B

M6110K-KY1M, KY2M

SCHEMATIC DIAGRAMS

— 9 —

PCB VIEW AND MAJOR WAVEFORMS

8

7

9

6

5

10

2

1

3 4

11

— 10 —

M5508-MA1M

8.7

0.7

0.0

7.0

0.0

8.6

8.6

6.6

6.0

11

5.2

8

6

3.2

0.0

7.7

4.5

8.7

1.2

0.0

8.6

0.0

8.6

0.0

1.2

4.4

7.7

9

0.0

+0.5

- 2.7

3.2

3.2

3.2

3.2

3.2

7

4

5.2

2.2

1.5

5.2

5.7

2.9

2.3

3

5

0.0

5.8

3.2

3.1

0.0

0.9

0.0

5.7

5.7

10

— 11 —

1 2

0.1

0.1

0.1

0.1

0.1

0.1

0.1

0.1

0.6

0.6

0.6

0.6

0.6

0.6

0.6 5.4

0.6

0.6

0.6

0.6

0.5

0.5

0.5

0.5

0.0

0.0

5.9

5.4

EXPLODED VIEW

— 12 —

IC AND TRANSISTOR LEAD IDENTIFICATIONS

LA4598

M5218APR

8

VCC

12

1234567

VCC

ch1 B.S.

ch1 OUT

Power GND

67

5

-

+

-

+

GND

34

D.C.

ch1 IN

ch1 N.F.

89101112

ch2 IN

Standby

ch2 N.F.

Pre GND

ch2 OUT

13

ch2 B.S.

S-8053ANO

EC B

EC

— 9 —

— 13 —

2SC3112B2SD2008Q,R

2SA854SR
2SC1740SQ
2SD1468SR

B

EBC

PARTS LIST

CTK-450

Notes: 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
separately.

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

FOB Japan

N Item Code No. Parts Name Specification Q M N.R.Yen R *

Unit Price

PCB Ass'y M5508-MA1M

2011 6979 LSI MSM6567-15GS-K-109 1 1 1,060 A L
2105 2219 IC S-8053ANO 1 5 60 A B
2114 1799 IC M5218APR 1 5 38 A A
2114 2891 IC LA4598 1 1 140 A B
2220 1387 Transistor 2SC1740SQ-TP-T 2 10 13 A A
2250 0168 Transistor 2SA854-SR-TP-T 1 10 20 A A
2252 0168 Transistor 2SC3112B-TPE2-T 1 10 15 A A
2253 0357 Transistor 2SD2008Q,R-T105-T 1 10 30 A A
2253 0420 Transistor 2SD1468SR,S-TP-T 1 10 16 A A
2310 7767 Zener diode RD6.8ESB2-T1-T 1 10 16 B A

N 2360 1631 Zener diode RD5.6ESB1-T1-T 1 10 8 B A

2370 0343 LED LN28RPX-(TT) 1 10 16 C A
2390 1316 Diode SB10-04A3-BT-T 1 10 28 C A
2390 1344 Diode 1SS133T-77-T 27 20 3 C A
2590 1176 Ceramic oscillator EFO-GC4345C4 1 1 110 B B
2606 0560 Carbon film resistor R-20-1.5M-J-T24-T 1 20 3 C A
2606 1141 Carbon film resistor R-20-1K-J-T23-T 26 20 2 C A
2606 1155 Carbon film resistor R-20-330-J-T23-T 3 20 2 C A
2606 1169 Carbon film resistor R-20-100-J-T23-T 8 20 2 C A
2606 1176 Carbon film resistor R-20-100K-J-T23-T 2 20 2 C A
2606 1204 Carbon film resistor R-20-3.3-J-T23-T 2 20 2 C A
2606 1253 Carbon film resistor R-20-4.7K-J-T23-T 1 20 2 C A
2606 1288 Carbon film resistor R-20-2.2K-J-T23-T 2 20 2 C A
2606 1295 Carbon film resistor R-20-2.7K-J-T23-T 2 20 2 C A
2606 1309 Carbon film resistor R-20-470-J-T23-T 1 20 2 C A
2606 1316 Carbon film resistor R-20-47K-J-T23-T 4 20 2 C A
2606 1365 Carbon film resistor R-20-3.9K-J-T23-T 2 20 2 C A
2606 1428 Carbon film resistor R-20-5.6K-J-T23-T 1 20 2 C A
2606 1435 Carbon film resistor R-20-560-J-T23-T 2 20 2 C A
2606 1442 Carbon film resistor R-20-18K-J-T23-T 2 20 2 C A
2606 1456 Carbon film resistor R-20-390K-J-T23-T 1 20 2 C A
2606 1470 Carbon film resistor R-20-7.5K-J-T23-T 1 20 2 C A
2606 1477 Carbon film resistor R-20-33-J-T23-T 2 20 2 C A
2606 1484 Carbon film resistor R-20-820-J-T23-T 2 20 2 C A
2606 1533 Carbon film resistor R-20-270K-J-T23-T 3 20 2 C A
2606 1652 Carbon film resistor R-20-390-J-T23-T 2 20 2 C A

N 2606 1757 Carbon film resistor R-20-6.8-J-T23-T 1 20 2 C A

2801 7413 Electrolytic capacitor 10RE2-330-T2-T 1 10 26 C A
2801 7910 Electrolytic capacitor 16RE3-470-T2-T 1 10 27 C A
2802 9833 Electrolytic capacitor 50RBP2-3R3-T2-T 2 10 18 C A
2802 9840 Electrolytic capacitor 50RBP2-R47-T2-T 1 10 18 C A
2802 9938 Electrolytic capacitor 50RBP2-1-T2-T 1 10 18 C A
2805 3142 Electrolytic capacitor 16RE2-10-T2-T 2 10 14 C A
2807 1023 Electrolytic capacitor 50RE2-1-T2-T 1 10 15 C A
2807 1082 Electrolytic capacitor 16RE2-100-T2-T 1 10 27 C A
2807 1121 Electrolytic capacitor 10RE2-220-T2-T 3 10 26 C A
2807 1139 Electrolytic capacitor 50RE2-R47-T2-T 2 10 12 C A
2807 1180 Electrolytic capacitor 10RE2-47-T2-T 6 10 16 C A
2813 1939 Semiconductive capacitor RT-B70TKYR473K-T 1 20 9 C A
2813 2093 Semiconductive capacitor RT-B50TKYR103K-T 1 20 4 C A
2813 2422 Semiconductive capacitor RT-B50TKYR183K-T 1 20 5 C A
2813 3283 Ceramic capacitor UP050F104Z-A-B 16 20 8 C A
2818 0365 Ceramic capacitor RT-HE50TKYB102K-T 12 20 3 C A
2818 0446 Ceramic capacitor RT-HE40TKYB101K-T 10 20 4 C A

Notes: N – New parts

M – Minimum order/supply quantity

R – Rank

— 15 —

FOB Japan

N Item Code No. Parts Name Specification Q M N.R.Yen R *

Unit Price

2819 0395 Ceramic capacitor RT-HE40TKSL100F-T 2 20 6 C A
2830 6436 Mylar capacitor AMZV-473K50-T 2 20 9 C A
2845 3220 Ferrite beads EXC-ELDR35V-T 1 10 12 C A
3025 0658 EMI filter ELK-AH103EB 3 10 26 C A
3501 7049 DC jack HEC2305-01-330 1 5 29 A A

3612 0711 Miniature jack YKB21-5101 1 1 90 B B
N 3841 0959 Inductor ELE-R100KR-T 1 10 25 C A
N 4317 4280 Blank PCB M5508-MA1M M111780-1 1 1 230 C C

6921 6211 Battery spring 700B M412171A-1 1 20 12 C A
N 6922 4850 PCB ass'y M5508-MA1M M111781*1 1 1 3,300 B V
N 6922 4940 Battery spring 508 M412289-1 1 20 18 C A
N 6922 5360 Felt 22x280 M412314-1 1 20 25 C A

PCB Ass'y KEY

2301 0101 Diode 1S2473-T-77-T 61 20 8 C A

JX 3719 4256 Ribbon cable MASKL61 DF5H11180-MM 1 10 41 C A
N JA 3719 4263 Ribbon cable M508A DF5H17180-MM 1 5 60 C B
N 4317 4290 Blank PCB M6110K-KY1M M211755-1 1 5 88 C B
N 4317 4301 Blank PCB M6110K-KY2M M111784A-1 1 5 80 C B
N 6922 4860 PCB ass'y KEY M111785*1 1 1 1,300 C N

Mechanical Parts

N 1 6922 4990 Panel 508 M111754-1 1 1 1,060 C L

2 6921 5031 Slide knob 601 M311859A-1 3 10 13 B A
3 6909 5890 SL contact 12D CSB-12D 3 10 35 B A

N 4 6922 4500 Rubber button 508 M211736-1 1 5 140 B B

5 3831 0637 Speaker 10G28BFA 1 1 190 B C

6910 1130 Sponge A M4630-1 1 10 14 C A
6 6917 4474 White key CEGB M110589D-1 5 1 120 A B
7 6917 4484 White key DFAS M110590D-1 1 1 110 A B
8 6917 4494 White key DFA M110591D-1 4 1 170 A B
9 6917 4506 Black key 10P M110594F-1 2 1 130 A B

10 6918 5996 Black key 5P M110594F-3 1 5 81 A B

11 6922 4980 Upper case sub ass'y M111755-1 1 1 1,400 C O
N 11-1 6922 4960 Upper key stopper 61 M412310-1 1 5 88 C B
N 11-3 6922 4971 Lower key stopper 61 M412311A-1 1 5 77 C B
N 11-2 6922 5740 Key damper 61 M412332-1 1 5 35 C A
N 12 6922 3990 Key contact rubber PET-TAC30A M111764-1 1 1 190 B C
N 13 6922 4000 Key contact rubber PET-TAC31A M111765-1 1 1 190 B C
N 14 6906 7093 Battery cover sub ass'y M311200C*12 1 1 38 B A
N 15 6922 4951 Bottom plate 508 M211737A-1 1 1 340 C D
N 6908 6160 Felt 156G M43073-1 4 20 7 C A

Screws

16 0009 4588 Screw 2.6 x 18 21 50 2 C A

17 0009 4589 Screw 2.6 x 8 4 50 2 C A

18 0009 2682 Screw 2.6 x 8 3 50 2 C A

19 0008 6417 Screw 4 x 10 20 50 2 C A

20 0009 2680 Screw 4 x 8 8 50 2 C A

Accessory

6916 7880 Music stand U M310827-1 1 1 120 C B

Notes: N – New parts

M – Minimum order/supply quantity

R – Rank

— 16 —

MA0200941A