Casio CTK-220L User manual

ELECTRONIC KEYBOARD

CTK-220L

25 RHYTHMS

POWER/MODE

FINGERED

CASIO CHORD

NORMAL

VOLUME SYNCHRO/

FILL-IN START/

STOP TEMPO TONE SONG

BANK STEP 1 STEP 2 STEP 3

MULTI FUNCTION DISPLAY

DEMO

RHYTHMTONE SONG BANK

PART

SELECT

RHYTHM

TRANSPOSE/TUNE

¢

OFF



20 SONG BANK KEYBOARD

100 TONES 20 SONG BANK

CONTENTS

Page

Specifications ................................................................................................................................... 1

Block Diagram .................................................................................................................................. 2

Circuit Description ............................................................................................................................ 3

Major Waveforms ............................................................................................................................. 6

Printed Circuit Boards ...................................................................................................................... 7

Schematic Diagrams ........................................................................................................................ 8

Exploded View................................................................................................................................ 14

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

— 1 —

SPECIFICATIONS

GENERAL

Number of keys: 49

Polyphonic: 12-note

Preset tones: 100

Transpose: F# ~ C ~ F: half-note

Auto-rhythms: 25, Tempo: Adjustable, 216 steps (40 ~ 255), initial value: 120

Accompaniment: CASIO Chord, Fingered, Fill-in pattern, Synchro start

Song bank: 20-tune

Digital volume control: 10 steps (0 ~ 9), initial value: 7

Tuning control: 440 Hz ±50 cents

Built-in speakers: 10 cm dia. ×1 (Output: 2 W)

Terminals: Headphone Jack, Stereo mini Jack [Output impedance: 70 q, Output voltage:

3.6 V (rms) MAX]

Auto power off: Approximately 6 minutes after the last operation

Power source: 2-way AC or DC source

AC: Required optional AD-5 AC adaptor

DC: 6 AA size batteries

Power consumption: 7.7 W

Dimensions (HWD): 85 ×771 ×324 mm (3-3/8 ×30-3/8 ×12-3/4 inches)

Weight: 3.4 kg (7.5 lbs) excluding batteries

ELECTRICAL

Current drain with 9 V DC:

No sound output 160 mA ±20 %

Maximum volume 840 mA ±20 %

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

Volume: Maximum

Phone output level (Vrms with 8 ohm load):

with key C2 pressed in Synth-Lead 1 98 mV ±20 %

Speaker output level (Vrms with 4 ohm load):

with key F4 pressed in Synth-Lead 1 2000 mV ±20 %

Minimum operating voltage: 6.3 V

— 2 —

BLOCK DIAGRAM

Buttons

Illuminant

Keyboard

7 seg. LED

LED Latch IC2, IC3

Q5 ~ Q8

Q1 ~ Q4

PG

X1, Q11 Reset IC

IC1

Power Supply Circuit

Q301 ~ Q304

D334, D336

Amp.

IC301

LA4598 Filter

Q305

Phone/Output

DC+9 V IN APO

MD0 ~ MD7

KO8 ~ KO11

LY1 ~

LY7

KO0 ~ KO7

LX0 ~

LX7

KI0 ~ KI7

CPU

LSI1

MSM 6755B-13

LED Driver

— 3 —

LX0 LX1 LX2 LX3 LX4 LX5 LX6 LX7

LY1 D4 D3 C3 C2 G#2 F#2 D#2 C#2

LY2 C4 E3 B2 D2 A#2 C#3 D#3 F#3

LY3 B3 F3 A2 E2 D#4 C#4 A#3 G#3

LY4 A3 G3 G2 F2 C#5 A#4 G#4 F#4

LY5 E4 C5 D5 B5 D#5 F#5 G#5 A#5

LY6 F4 B4 E5 A5 C6

LY7 G4 A4 F5 G5

CIRCUIT DESCRIPTION

KEY MATRIX

LED MATRIX

KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7

KO0 C2 G#2 E3 C4 G#4 E5 C6

KO1 C#2 A2 F3 C#4 A4 F5

KO2 D2 A#2 F#3 D4 A#4 F#5

KO3 D#2 B2 G3 D#4 B4 G5

KO4 E2 C3 G#3 E4 C5 G#5

KO5 F2 C#3 A3 F4 C#5 A5

KO6 F#2 D3 A#3 F#4 D5 A#5

KO7 G2 D#3 B3 G4 D#5 B5

KO8 01234

Start/

Stop Up Volume

Down

KO9 56789Down Volume

Down Synchro/

Fill-In

K10 Tone Rhythm Song

Bank Part

Select One Key One Key Demo

K11 Step-1 Step-2 Step-3 Fingered Casio

Chord Normal Off

NOMENCLATURE OF KEYS

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

D2 E2 F2 G2 A2 B2 C3 D3 E3 F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6

— 4 —

Pin No. Terminal In/Out Function

1 MA14 — Not used.

2 MWEB Out Clock for LED latches

3 ~ 5 — — Not used.

6 MA0 Out 7-seg. LED drive signal

7 ~ 19 MA1 ~ MA11 — Not used.

20 ~ 27 MD0 ~ MD7 Out 7-seg. LED drive signal

28, 29 NC1, NC2 — Not used.

30 DGND In Ground (0 V) source

31 DVCC In +5 V source

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

34 NC3 — Not used.

35 RSTB In Reset signal input

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

37 P25/TXD — Not used.

38 NMI In Power ON signal input. Connected to +5 V.

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 +5 V 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 +5 V source for the internal ADC

53 NC8 — Not used.

54 MOD0 In Mode selection terminal. Connected to +5 V.

55, 56 MOD1, MOD2 In Mode selection terminal. Connected to ground.

57 P40 In APO cancellation signal

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

66 ~ 73 KO0/P50 ~ KO7/P57 Out Terminals for key scan signal

74 ~ 77 KO8/P20 ~ KO11/P23 Out Terminals for button input signal

78 NC9 — Not used.

79 LVCC In +5 V source

80 ~ 95 LX0 ~ LX7, LY0 ~ LY7 Out LED drive signal

96 LGND In Ground source

97 ~ 100 MA18 ~ MA15 — Not used.

CPU (LSI1: MSM6755B-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 CPU also controls key input, button

input and LED driving. The following table shows the pin functions of LSI1.

— 5 —

LVDD

CPU



LSI1



MSM6755B-13

LX0 ~ LX7

LY1 ~ LY7 Q1 ~ Q4

Q5 ~ Q8

Q2 ~ Q4

La ~ Lg

(Common)

(Segment) MWEB

LED

Latch

IC3

7-segment LED Keyboard LEDs

LED

Latch

IC2

MD0 ~ MD3

MD4 ~ MD7

MA0

Amp.

IC301 Filter Block

Q305 CPU

LSI1

FILTER BLOCK

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

POWER AMPLIFIER (IC301: LA4598)

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

The following table shows the pin function of IC301.

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

— 6 —

1APO signal

MSM6755B-13 pin 39

2Reset signal

RH5VL40AA pin 1

4Sound signal

JH connector pin 2 5LED drive signal LX0

MSM6755B-13 pin 88

3Clock

MSM6755B-13 pin 32

6LED drive signal LY1

MSM6755B-13 pin 81

Tone: Whistle (59)

Key : A4 Key: D4

MAJOR WAVEFORMS

— 7 —

PRINTED CIRCUIT BOARDS

Sub PCB KDM445-MA2M

Top view

Main PCB JCM446-MA1M

Bottom view Top view

R309

R324

JA3

D329 R354

Q305

C363

R353

R352

R342

125

75 125

125

225

C348

C342

C374

R326

R325

C341

C344 C350

IC301

C347

C345

C346

C349

R365

R339

C361

225

200

100

R310

R348

R343

C339

AVDD

DVDD

LVDD

VCC

R320

R318

R302

JA5

JA4 125

D331

J301

J302

C368

D333

5GR

D332 0

100

100

75

D320

D319

D318

D317

D316

D315

D310

D308

D306

D307

D305

D309

D323

D322

D321

12 JJ 1 10 JH 1

D301

D330

D325

D326

D324

175

250 R373

R370

R368

R369

C332

D302

C371

R338

C306

C307

R311

100

JA2

JA1

125

Q301

Q302

C336

Q303

D334

C330

R321

R323

R322

D336 D308

C334

C331

C335 R388

Q304

R317

R316

D304

R303

R301

C301 C328 L301

L302

445B

UJW5

L305

R335

R333

R331

C352

L303

L304

LED301

D335

C333

R319

150

100

BE 5

D328

D327

D314

D312

D311

D313

R327

C337

C373

Q310

C355

C372

R374 R371

R372

C359

R366

C356

Q312

C364

— 8 —

Connected to KDM4910K-KY2M

Connected to KDM445-LD2M

Note: KI signals are renamed. (e.g. KI0 on the keyboard PCB ⇒KI1 on the main PCB)

NO USE FOR CTK-330

SCHEMATIC DIAGRAMS

Main PCB JCM446-MA1M

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