Casio CTK-480 User manual

ELECTRIONIC KEYBOARD

CTK-480

MULTI FUNCTION DISPLAY

POWER/MODE

FINGERED

CASIO CHORD

NORMAL

OFF

VOLUME SYNCHRO/

FILL-IN START/

STOP

TEMPO

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¢

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100 TONES

¢

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TONE RHYTHM SONG

TONE

RHYTHM

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60's

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wr[^

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50's

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

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20 SONG BANK50 RHYTHMS

º˘–…Ł˜

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MELODY

ON/OFF

— 2 —

CONTENTS

Specifications .......................................................................................................................... 2

Block Diagram......................................................................................................................... 3

Circuit Description ...................................................................................................................4

Troubleshooting ......................................................................................................................7

Major Waveforms .................................................................................................................... 8

Schematic Diagrams ............................................................................................................... 9

Printed Circuit Boards ...........................................................................................................11

Exploded View ...................................................................................................................... 13

Parts List ............................................................................................................................... 15

SPECIFICATIONS

GENERAL

Number of keys: 61

Polyphonic: 12-note

Preset tones: 100

Auto-rhythms: 50, Tempo control: 40 to 255

Accompaniment: CONCERT Chord, Fingered

Song bank: 20-tune

Tuning control: 440 Hz ±50 cents

Built-in speakers: 4 inch dia. 1 W input rating: 2 pcs

Terminals: Headphone Jack (Output impedance: 50 ohm, Output voltage: 4.6 V (rms) MAX

Power source: 2-way AC or DC source

AC: AC adapter

DC: 6D size dry batteries, Vehicle battery with DC adapter

Power consumption: 7.7 W

Dimensions(HWD): 90 ×910 ×322 mm (3-1/2 ×36-3/16 ×12-11/16 inches)

Weight: 3.9 kg (8 lbs) excluding batteries

ELECTRICAL

Current drain with 9 V DC:

No sound output 120 mA ±30%

Maximum volume 650 mA ±30%

with white keys C1 to G2 pressed in Synth-Lead 1

Volume: 9

Phone output Level (Vrms with 8 ohm load each channel):

with key E3 pressed in Synth-Lead 1 80 mV ±30%

Sound Pressure (at 10 cm away from speaker):

with key E3 pressed in Synth-Lead 1 100 dB ±10 dB

Minimum operating voltage: 6.0 V

— 3 —

CPU

MSM 6755B-06

LSI101

Keyboard

Buttons

LED

Reset IC

IC102 Oscillator

X101, Q111

Q105

Power Supply Circuit

Q101 ~ Q104, D108, D109

Power Amp.

LA4598

IC101

Filter (L)

Q109

Filter (R)

Q110

Output

DC+9V IN

VC VCC AVDD DVDD LVDD

APO

CC1 ~ CC3

La ~ Lg,

Lp KO8 ~

KO11 KI0 ~ KI7

KO0 ~ KO7

BLOCK DIAGRAM

— 4 —

CIRCUIT DESCRIPTION

KEY MATRIX

KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7

KO0 C1 G#1 E2 C3 G#3 E4 C5 G#5

KO1 C#1 A1 F2 C#3 A3 F4 C#5 A5

KO2 D1 A#1 F#2 D3 A#3 F#4 D5 A#5

KO3 D#1 B1 G2 D#3 B3 G4 D#5 B5

KO4 E1 C2 G#2 E3 C4 G#4 E5 C6

KO5 F1 C#2 A2 F3 C#4 A4 F5

KO6 F#1 D2 A#2 F#3 D4 A#4 F#5

KO7 G1 D#2 B2 G3 D#4 B4 G5

KO8 0 1 2 3 4 Start/Stop Tempo

Up Volume

KO9 56789

Tempo

Down Volume

Down Synchro/

Fill-In

K10 Tone Rhythm Song

Bank Melody

On/Off

K11 Fingered CONCERT

Chord Normal Power Off

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 —

AVDD

AG AG AG AG

16 V 10 µ

2SC1740SQ10 K

10 K 10 K

C332(H)

33 K

C152 (H)

C221B (A)

10 V 22 µ

2.2 K

To main volume

From the CPU

CPU (LSI101: MSM6755B-06)

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

channel sound waveforms in accordance with the pressed key and the selected tone.

The following table shows the pin functions of LSI101.

Pin No. Terminal In/Out Function

1 ~ 29 MA14 ~ NC2 — Not used.

30 DGND In Ground (0V) source

31 DVCC In +5V source

32, 33 XTLO, XTLI In/Out 20MHz clock input/output

34 NC3 — Not used. Connected to ground.

35 RSTB In Reset signal input

36 P24/RXD — Not used. Connected to +5V.

37 P25/TXD — Not used.

38 NMI In Power on signal input

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 +5V source for the internal DAC and ADC

47 DAOL Out Left channel sound waveform output

48 REFL Out Terminal for the internal DAC and ADC

49 AGdac In Ground source for the internal DAC

50 AGadc In Ground source for the internal ADC

51 ANI — Not used. Connected to ground.

52 AVadc In +5V source for the internal ADC

53 NC8 — Not used. Connected to +5V.

54 MOD0 In Mode selection terminal

55, 56 MOD1, MOD2 In Mode selection terminal

57 KO9/P40 In Power source detection signal input

58 ~ 65 KI0/P30 ~ KI7/P37 In Terminals for key/button input signal

66 ~ 73 KO1/P50 ~ KO8/P57 Out Terminals for key scan signal

74 ~ 77 P20 ~ P23 Out Terminals for button input signal

78 NC9 — Not used.

79 LVCC In +5V source

80 ~ 82 CC1 ~ CC3 Out LED common signal output

83 ~ 87 — — Not used.

88 ~ 95 La ~ Lg, Lp Out Not used.

96 LGND In Ground (0V) source

97 ~ 100 — — Not used.

FILTER BLOCK

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

— 6 —

POWER AMPLIFIER (IC101: LA4598)

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 Power GND In Ground (0V) source

2 Ch1 B.S. — Terminal for a 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 a decoupling capacitor

8 Pre GND In Ground (0V) source

9 Stand by In Power control signal input. 0 V: Off, +9 V: On

10 Ch2 IN In Channel 2 input

11 Ch2 N.F. In Negative feedback input

12 Ch2 OUT Out Channel 2 output

13 Ch2 B.S. — Terminal for a bootstrap capacitor

14 NC — Not used

LED DRIVING

CPU

LSI01

MSM6755B

La~Lg, Lp

CC1~CC3

LVDD

Q106~Q108

LED Driver



— 7 —

INITIAL RESET CIRCUIT

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.

CPU

MSM 6755B-06

LSI101

RESET

Reset IC

RE5VA35A

IC102

VDD Battery Set

TROUBLESHOOTING

Nature of Trouble Faulty Block Cause/Remedy

No power Power supply circuit Faulty IC101. Replace IC101.

Faulty D106 ~ D109. Replace D106 ~

D109.

Faulty Q101 ~ Q104. Replace Q101 ~

Q104.

Power switch Poor contact. Clean the contacts.

Power jack (J101) Open J101 or poor soldering. Replace

J101 or resolder.

No sound at all Power Amp (IC101: LA4596) Open or shorted IC101. Replace IC101.

CPU (LSI101: MSM6755B-06) Faulty LSI101. Replace LSI101.

Oscillator Faulty Q111. Replace Q111.

Open X101. Replace X101.

Certain keys or switches

do not function Key and switch matrix Open circuit on KO or KI line.

Replace keyboard PCB assembly.

CPU (LSI101: MSM6755B-06) Faulty LSI101. Replace LSI101.

A certain key or switch

does not function Key and switch matrix Dust on the contact.

— 8 —

0.1 s

CH1

CH1 5V BWL

20 µs

CH1

BWL

CH1 1V

10 µs

CH1

CH2

CH2 BWL

CH1 5V 5V

1ms

CH2

CH1

BWL

CH1 1V 1V

CH2

1ms

CH1

CH2

BWL

CH1 1V CH2 1V

1ms

CH1

CH2

BWL

CH1 1V 1V

CH2

1RESET signal

IC102 pin 1 2Main clock pulse

MSM6755B-06 pin 32

3Key scan signal KO10

MSM6755B-06 pin 76

4Key scan signal KO11

MSM6755B-06 pin 77

5Sound signal output (L-ch)

MSM6755B-06 pin 47

6Sound signal output (L-ch)

Q109 2SC1740SQ Emitter

7Sound signal output (R-ch)

MSM6755B-06 pin 45

8Sound signal output (R-ch)

Q110 2SC1740SQ Emitter

9Sound signal output (R-ch)

LA4598 pin 3

0Sound signal output (L-ch)

LA4598 pin 12

Tone: Flute Ensemble (58)

Key: A3

Volume: 7

MAJOR WAVEFORMS

— 9 —

SCHEMATIC DIAGRAMS

Main PCB KDM440-MA1M

Notes:

1. All capacitance values are indicated in "µF" (p=10-6 µF)

2. All resistance values are indicated in "Ω" (k=103 Ω, M=106 Ω).

— 10 —

Keyboard PCBs KDM6111K-KY1M/KY2M

Notes:

1. All capacitance values are indicated in "µF" (p=10-6 µF)

2. All resistance values are indicated in "Ω" (k=103 Ω, M=106 Ω).

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