Casio CTK-450 User manual

(with price)

CTK-450

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

— 1 —

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 KΩload each cannel): 650 mV ±20%

with key C6 pressed in Clarinet tone

Phone Output Level (Vrms with 8 Ωload 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

SPECIFICATIONS

— 2 —

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

— 3 —

KO0~KO14

KI0~KI7

Keyboard

Switches

Oscillator

Power Supply Circuit

AVDD +5V

VCC +9V

Speaker

Output Jack

Filter

T4/T5

CPU

MSM6567-15

T1/T2/T3

Amplifier

LA4598

Main Volume

Mute Circuit

Reset IC

VDD +5V

M5218APR

S-8053ANO

LEDX6

(APO)

BLOCK DIAGRAM

— 4 —

0IK1IK2IK3IK4IK5IK6IK7IK

0OK rewoP

FFO2C2#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 opmeT

nwoD

.pmoccA

1emuloV

).niM( 765

21OK opmeT

pU .pmoccA

2emuloV

31OK .pmoccA

3emuloV enoTmhtyhR ydoleM

FFO/NO /tratS

potS/cnyS

ni-lliF

41OK .pmoccA

4emuloV

)xaM(

CIRCUIT DESCRIPTION

Key and Switch Matrix

Nomenclature of Keys

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 B6A6G6F6E6D6 C7

C#3A#2G#2

F#2D#2

C#2 A#6

G#6F#6D#6

C#6

— 5 —

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.

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.

— 6 —

Filter Block

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

waveform.

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.

MSM6567-15

CPU

To mute circuit

To main volume

Sound signal from filter block

+0.5V at the minimum amplitude (no sound)

-2.7V at the maximum amplitude

— 7 —

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.

11 13

Input

Amp. Pre-drive

Amp. Power

Amp.

TSD protector

Stand by

Bias circuit

Input

Amp. Pre-drive

Amp. Power

Amp.

Ch1 IN

Ch1 NF

Pre GND

D.C.

Ch2 IN

CH2 NF

CH2 BS

CH1 OUT

POWER GND

VCC

STAND BY

CH2 OUT

CH2 BS

Block Diagram

— 8 —

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 100µcapacitor 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 Aand Bwith 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.

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