CASIO M200 Service Manual

M-200

INDEX

(without price)

M-200

ELECTRIONIC KEYBOARD

CONTENTS

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

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

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

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

IC and Transistor Lead Identification . . . . . . . . . . . . . . . . . . . . . . . . 6

PCB View and Major Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . 7

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

Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

SPECIFICATIONS

General

Number of Keys: 32
Polyphonic: 4-note
Preset Tones: 25
Tone Edit Variations: 4
Patterns: Auto-Rhythms: 8, including; 8-Beat, 16-Beat, Swing, Slow Rock, Shuffle,

March, Samba, Waltz

Accompaniments: 8, including; Rock, Pops, Jazz, Funk, House, Country,

Ratin, Classical

Funny Sounds: 8, including; Fanfare, Hpper, Computer Sound, Horror,

Child's Play, Orient, Jungle, Comedy

Demonstration Tunes: 10 tunes with Lesson Function

1. Twinkle Twinkle Little Star 6. Home, Sweet Home

2. Minuet (J.S. Bach) 7. Little Brown Jug

3. Oh! Susanna 8. The Skaters Waltz

4. Aura Lee 9. Jingle Bells

5. Lullaby (Brahms) 10. When The Saints Go Marching In
Built-In Speakers: 8.0 cm dia. 1.0 W Input Rating: 2 pcs.
Terminals: Output Jack [Output Impedance:100 Ω, Output Voltage: 2.1 V (rms) MAX]

AC Adapter Jack (DV 7.5 V)

Power Source: DC: 5 AA size dry batteries

Battery life: Approx. 6 hours (SUM-3/R6P)

AC: AC Adapter AD-1
Power Consumption: 1.6 W
Dimensions (HWD): 57 x 619 x 178 mm

(2-1/4 x 24-3/8 x 6 inches)
Weight: 1.1 kg (2.4 lbs) including batteries

Electrical

Current Drain with 7.5 V DC:
No Sound Output 28 mA ± 20%
Maximum Volume 90 mA ± 20%

with keys C4 and E4 pressed in Flute tone

Volume: Maximum, Accmpaniment: Latin,

Tempo: Maximum

Sound Pressure Level at 10 cm away from the speaker 100 dB ± 10 dB

with key C6 pressed in Clarinet, Volume: Maximum

Minimum Operating Voltage: 5.0 V

— 1 —

Output Jack

BLOCK DIAGRAM

KO0~KO6

CPU

Amplifier

AN8053N

IC1

Speakers

Nomenclature of Keys

VDD

Filter

T1

MSM6387-16

KI0~KI7

LSI1

Keyboard

Switches

Oscillator

X1

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

— 2 —

CIRCUIT DESCRIPTION

Key Matrix

KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7

KO0 F3 F#3 G3 G#3 A3 A#3 B3 C4

KO1 C#4 D4 D#4 E4 F4 F#4 G4 G#4

KO2 A4 A#4 B4 C5 C#5 D5 D#5 E5

KO3 F5 F#5 G5 G#5 A5 A#5 B5 C6

KO4 Keyboard Wind String Synth S.E. Tone Edit

KO5 Rhythm Accomp. Stop

KO6 Lesson MelodyOff Demo

CPU (LSI1: MSM6387-16)

Containing a sound data ROM and a DAC (Digital to Analog Convertor), the CPU provides sound wave­form in accordance with the pressed key and the selected tone.
The following table shows the pin functions of LSI1.

Pin No. Terminal In/ Out Function

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

3 RESET In Power ON reset input. On: +6 V Off: 0 V
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 ~ 22 KO11 ~ KO8 Not used.
23 ~ 30 KO7 ~ KO0 Out Key and switch scan signal output

Funny

Accomp.

Tempo

Up

Volume

Up

Tempo

Down

Volume

Down

— 3 —

Filter Block

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

AVDD

T1
2SC1740SQ

R6

R7 R8

C5

To Amplifier

R5

AG

R11

C9

AG

From CPU

C10

C11

AG

Amplifier/Voltage Regulator (IC1: AN8053N)

Consisting of an amplifier and a voltage regulator, AN8053N amplifies the sound signal from the CPU and
also provides the CPU +5V source.
The following figure shows the internal block of IC1.

5V

VCC NC CONT

16

15

VREG

14 13

NCNC NC PRE GND

12 11

10

9

5V REG

POWER

-

SP AMP

+

1

SPO NC SP GND PC-1 PC-2 SPI SPM VREF

32

4

5

6

7

VREF

8

— 4 —

TROUBLESHOOTING

Nature of Trouble

No sound at all

Certain key(s) or
switch(es) do(es) not
work.

Faulty Block

Power amp.
(IC1: AN8053N)

Power Switch

CPU
(LSI1: MSM6387-16)

Oscillator (X1)

Key or Switch Contact
Open Circuit on KO or KI

Lines

Checkpoint

Pin 13 should have +5V.
An amplified waveform should be observed at pin

1.
Voltage at pin 3 of the CPU should be raised from

0V to +5V when the power switch is turned on.
Switch contact.
Pins 24 ~ 30 should provide pulses.
Pin 5 should provide a sound waveform when a

key is pressed.
Pins 8 and 9 of the CPU should receive an

oscillation signal.

— 5 —

IC AND TRANSISTOR LEAD IDENTIFICATION

LSI1: MSM6387-16

30292824272625

KO0

KO1

KO2

KO3

KO4

KO5

TEST2

TEST1

RESET

AVDD

OUT

AGND

1

2

374

5

6

IC1: AN8053N

16

15

14

NC

VCC

CONT

23222120191817

KO6

KO7

KO8

KO9

KO10

GND

COSI

COSO

VDD

KI0

8

9

1011121314

13

12

11

10

NC

NC

NC

VREG

KI7

KO11

KI1

KI2

9

PR GND

KI6

KI3

16

KI5

KI4

15

SPONCSPG

1

2

3

T1: 2SC1740SQ

E C B

PC-1

4

— 6 —

PC-2

5

SPI

6

SPM

7

VREF

8

Main PCB M3546-MA1M (Top View)

4

5

1 3 2

PCB VIEW & MAJOR WAVEFORMS

1

Clock pulse COSO

1

MSM6387-16 Pin 9

2

5

4

3

Key scan signal KO0

2

MSM6387-16 Pin 30
Key scan signal KO1

3

MSM6387-16 Pin 29

— 7 —

Sound output

4 Power Amp. output

MSM6387-16 Pin 5
Tone : Piano
Key : G4

5

AN8053N Pin 1
Tone : Piano
Key : G4
Volume : Max.

PCB M3546-MA1M

SCHEMATIC DIAGRAM

1

4

5.2

4.7

2.5

0.0

0.0

~

4.9

0.0

0.0

0.0

~

0.0

2.2

0.6

0.5

0.5

2.0

0.0

4.7

1.9

4.5

0.5

~

0.5

5

3.1

4.1

0.0

4.0

4.1

9.1

0.0

5.2

5.2

0.0

3

2

— 8 —

KY1M KEYBOARD PCB

— 9 —

EXPLODED VIEW

11

9

8

6

10

12

3

4

7

1

13-1

13-2

2

16

13

17

5

15

— 10 —

14

PARTS LIST

M-200

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
seperately.

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

Electrical Parts

LSI1 2011 4767 LSI MSM6387-16SS-106 1 1 A E

IC1 2114 3269 Monolithic IC AN8053N 1 1 A B

T1 2252 0497 Transistor 2SC3199Y-AT-T 1 20 B A
D1 2390 0371 Diode DSK10B-BT-T 1 10 B A
D2 2390 1316 Diode SB10-04A3-BT-T 1 5 B A

D4~12,51~82 2390 1589 Diode MA165P-(TA5)-T 42 20 C A

X1 2590 0742 Ceramic oscillator EFO-GC2175C3 1 1 B B

R3,7,8 2606 1141 Carbon film resistor R-20-1K-J-T23-T 3 20 C A

R1,2,9,10 2606 1169 Carbon film resistor R-20-100-J-T23-T 4 20 C A

R6 2606 1288 Carbon film resistor R-20-2.2K-J-T23-T 1 20 C A
R5 2606 1365 Carbon film resistor R-20-3.9K-J-T23-T 1 20 C A

R11 2606 1484 Carbon film resistor R-20-820-J-T23-T 1 20 C A

R4 2606 1554 Carbon film resistor R-20-120K-J-T23-T 1 20 C A
C1 2802 9777 Electrolytic capacitor 16RE3-470-T20-T 1 20 C A
C8 2805 3061 Electrolytic capacitor 6.3RE2-220-T2-T 1 10 C A

C3/4 2805 3134 Electrolytic capacitor 10RE2-22-T2-T 2 20 C A

C6 2807 1023 Electrolytic capacitor 50RE2-1-T2-T 1 10 C A
C7 2807 1091 Electrolytic capacitor 6.3RE2-100-T2-T 1 10 C A
C2 2807 1710 Electrolytic capacitor 16RE3-220-T2-T 1 20 C A
C9 2813 0651 Semiconductive capacitor RT-C40TKYR332K-T 1 20 C A
C5 2813 1932 Semiconductive capacitor RT-C50TKYR223K-T 1 20 C A

C10 2813 1939 Semiconductive capacitor RT-B70TKYR473K-T 1 20 C A

C12/13 2813 2093 Semiconductive capacitor TR-B50TKYR103K-T 2 20 C A

C11 2813 2415 Semiconductive capacitor RT-B50TKYR153K-T 1 20 C A

FB1~4 2845 3220 Ferrite beads EXC-ELDR35V-T 4 20 C A

J1 3501 3731 DC jack HEC2305-01-250 1 5 A A

J2 3612 0711 Miniature jack YKB21-5101 1 1 A B

3719 3990 Ribbon cable M546A DF5H12065-80008000 1 20 C A

L1/2 3841 0910 Coil FL5R1R0PNA 2 5 C A

4317 3550 Blank PCB M3546-MA1M M111579-1 1 1 C B
4317 3560 Blank PCB M3546-KY1M M111579-2 1 1 C B

1 6921 6390 PCB ass'y M3546-MA,KY M111578*1 1 1 B P

Mechanical Parts

2 3831 0385 Speaker EAS-8P149AD 1 2 C B
3 6909 7380 SL contact 9D CSB-09D 1 10 B A
4 6917 1471 Key contact rubber M210670A-1 1 5 B B
5 6917 1511 White key set M110550A-1 1 1 A B
6 6917 1522 Black key set M110551B-1 1 5 A B
7 6917 4510 Stopper 216 M411074-1 1 10 C A
8 6921 6480 Slide knob 601 M311859-2 1 10 B A

N 9 6922 7180 Upper case sub ass'y M211568*6 1 1 C E

10 6917 1491 Upper key stopper M310881A-1 1 10 C A

11 6917 1500 Key stopper 216 M411040-1 2 10 C A

N 12 6922 6230 Rubber button M546 M211555-3 1 1 C C
N 13 6906 6965 Lower case sub ass'y M211570E*5 1 1 C E

13-1 6345 2238 Battery spring (+) A-G55 A42606B-1 1 20 C A
13-2 6912 2630 Battery spring (-) 120 M42382-1 1 10 C A

14 6921 6500 Battery cover 546 M311914-1 1 5 B A

N 15 6922 9490 Rating label M411126-17 1 10 C A

16 0009 2682 Screw 2.6 x 8 ZMC-3 21 20 C A

17 0009 5573 Screw 2.6 x 10 ZMC-3 15 20 C A

Notes: N – New parts

M – Minimum order/supply quantity

R – Rank

— 11 —

8-11-10, Nishi-Shinjuku
Shinjuku-ku, Tokyo 160, Japan
Telephone: [phone]

Aug, 1994