Casio CTK-100 User manual

(with price)

CTK-100

ELECTRONIC KEYBOARD

CTK-100

CONTENTS

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

BLOCK DIAGRAM ......................................................................................................... 2

CIRCUIT DESCRIPTION ................................................................................................ 3

TROUBLESHOOTING.................................................................................................... 5

IC AND TRANSISTOR LEAD IDENTIFICATIONS ........................................................ 6

SCHEMATIC DIAGRAMS .............................................................................................. 7

PCB VIEW & MAJOR WAVEFORMS............................................................................ 8

EXPLODED VIEW ........................................................................................................ 10

PARTS LIST ................................................................................................................. 11

— 1 —

SPECIFICATIONS

Electrical

Current Drain with 9V DC:

No Sound Output 47 mA ±20%

Maximum Volume 413 mA ±20%

with keys C2, D2, E2 and F2 pressed in

Car-Horn tone, Volume; Maximum

Output Level (Vrms with 8 Ωload each channel): 76 mV ±20%

with key G2 pressed in Street Organ tone

Speaker Input Level: 935 mV ±20%

with key G2 pressed in Street Organ tone

Minimum Operating Voltage: 6.0 V

General

Number of Keys: 49

Polyphonic: 8-note

Preset Tones: 100

Auto-Rhythms: 100

Auto-Accompaniment: CASIO Chord/Fingered

Demonstration Tune: Classical Medley

Built-In Speakers: 10 cm dia. 1.0W Input Rating: 2 pcs.

Terminals: Output Jack [Output Impedance: 120 Ω, Output Voltage: 3 V (rms)MAX],

AC Adapter Jack (DC 9 V)

Power Source: 3-way AC or DC source

AC: AC adapter AD-5

DC: 6 AA size dry batteries

Battery life: Approx. 3 hours (SUM-3/R6P)

Approx. 6 hours (AM-3/LR6)

Power Consumption: 5.0 W

Dimentions: 86 x 857 x 285 mm (HWD)

(3-3/8 x 33-3/4 x 11-1/4 inches) (HWD)

Weight: 3.2 kg (7.0 lbs) excluding batteries

Standard Accessory: Music stand

— 2 —

BLOCK DIAGRAM

KO0~KO9

KI0~KI7

Keyboard

Switches

Oscillator

VDD +5V

Power supply circuit

VC +9V

Amplifier

Speakers

Output Jack

LA4598 Filter

T3/T4

CPU

MSM6387-13

Main Volume

— 3 —

0IK1IK2IK3IK4IK5IK6IK7IK

0OK

)1CK( 01 2C2#C2D2#D2E2F

1OK

)2CK( 23 2#F2G2#G2A2#A2B

2OK

)3CK( 45 3C3#C3D3#D3E3F

3OK

)4CK( 67 3#F3G3#G3A3#A3B

4OK

)5CK( 89 4C4#C4D4#D4E4F

5OK

)6CK( enoTmhtyhR4#F4G4#G4A4#A4B

6OK

)7CK( opmeT

pU opmeT

nwoD 5C5#C5D5#D5E5F

7OK

)8CK( /tratS

potS nI-lliF5#F5G5#G5A5#A5B

8OK

)9CK( omeD6C

.pmoccA

1emuloV

)niM(

.pmoccA

2emuloV

.pmoccA

3emuloV

.pmoccA

4emuloV

)xaM(

9OK rewoP

FFO

lamroNderegniFOISAC

drohC

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

C#3A#2G#2F#2

D#2

C#2

C2 D2 E2 F2 G2 A2 B2 C3 D3 E3

— 4 —

CPU (MSM6387-13)

The CPU contains a sound data ROM and a DAC (Digital to Analog Convertor), and it provides a sound

waveform in accordance with the pressed key and the selected tone.

The following table shows the pin functions of the CPU.

Filter Block

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

waveform.

From CPU

To main volume

Pin No. Terminal In/ Out Function

1, 2 TEST1, TEST2 Not used. Connected to ground.

3 RESET In Power ON reset terminal. When the power switch is

turned on, the terminal receives a low level signal and

the internal circuits of the LSI are initialized.

4 AVDD In +5 V sorce for the built-in DAC

5 OUT Out Sound waveform output

6 AGND In Ground (0 V) source for the built-in DAC

7 GND In Ground (0 V) source

8, 9 COSI, COSO In/Out 21.725 MHz clock pulse input/output

10 VDD In +5 V source

11 ~ 18 KI0 ~ KI7 In Input terminal from keys and switches

19, 20 KO11, KO10 Not used.

21 ~ 30 KO9 ~ KO0 Out Key and switch scan signal output

VDD

C273(H) C473(H)

3.3K 1K 2.2K

C333(H)

2SC1740SQ

150K

1.5K

120K

C822(H)

C823(H)

AG AG AG

AG AG

2SC1740SQ

— 5 —

Power Amplifier (LA4598)

The power amplifier is a 2-channel power amplifier with a standby switch.

The following table shows the pin functions of the power amplifier.

TROUBLESHOOTING

Nature of Trouble Faulty Block Checkpoint

No power Power Supply Circuit Emitter of T2 should provide +5.5 V.

Base of T2 should receive +6 V.

Power Jack Jack contact.

No sound at all Power Amp. (LA4598) Pin 9 should receive +9 V when the

power switch is turned on.

Check output signals of pins 3 and 12.

CPU (MSM6387-13) Pins 21 ~ 30 should provide pulses.

Pin 5 should have a sound signal when

keys are pressed.

Oscillator Pins 8 and 9 of the CPU should receive

an ocsillation signal.

A certain key or switch

does not function Key and Switch Matrix Dust on the contact.

Certain keys or switches

do not function Key and Switch Matrix Open circuit on KC or KI line.

Pin No. Terminal In/Out Functiion

1 Power GND Ground (0 V) source

2 Ch1 B.S. Out Terminal for a bootstrap capacitor

3 Ch1 OUT In Channel1 output

4 VCC In +9 V source. Connected to the power source directly.

5 Ch1 N.F. In Negative feedback input

6 Ch1 IN In Channel1 input

7 D.C. Terminal for a decoupling capacitor

8 Pre GND In Ground (0 V) source

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

10 Ch2 IN In Channel2 input

11 Ch2 N.F. In Negative feedback input

12 Ch2 OUT Out Channel2 output

13 Ch2 B.S. Terminal for a bootstrap capacitor

14 NC Not used.

— 6 —

IC AND TRANSISTOR LEAD IDENTIFICATION

T3, T4: 2SC1740SQ T2: 2SD2008Q,R

LA4598

TEST2

TEST1

RESET

GND

AVDD

OUT

AGND

COSI

COSO

VDD

KI0

KI1

KI2

KI3

KI4

KO0

KO1

KO2

KO6

KO3

KO4

KO5

KO7

KO8

KO9

KO10

KO11

KI7

KI6

KI5

BCE B

Power GND

Ch1 B.S.

Ch1 OUT

VCC

Ch1 N.F.

Ch1 IN

D.C.

Pre GND

Standby

Ch2 IN

Ch2 N.F.

Ch2 OUT

Ch2 B.S.

MSM6387-13

— 7 —

SCHEMATIC DIAGRAMS

Keyboard PCBs M496K-KY1M, KY2M

— 8 —

PCB VIEW and MAJOR WAVEFORMS

5671432

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