ELECTRONIC KEYBOARD

MA-100

MA-100

100 TONESKEYBOARD00 PIANO01 ELEC PIANO02 FUNKY CLAVI03 HARPSICHORD04 ELEC ORGAN05 JAZZ ORGAN06 PIPE ORGAN07 CHURCH ORGAN08 STREET ORGAN09 ACCORDION

WIND10 SAMBA WHISTLE11 WHISTLE12 QUENA13 FLUTE14 FLUTE-VIB15 OCARINA16 BAGPIPE17 HARMONICA18 CHORUS19 BRASS-STRINGS

STRING20 WARM STRINGS21 STRINGS22 VIOLIN23 VIOLIN-VIB24 CELLO25 ELEC GUITAR26 JAZZ GUITAR27 MUTE GUITAR28 METAL GUITAR29 SLAP BASS

30 ELEC BASS31 WOOD BASS32 SNARE BASS33 MANDOLIN34 BANJO35 SITAR36 UKULELE37 HARP38 TAISHOKOTO39 SHAMISEN

BRASS40 BRASS ENS41 WARM BRASS42 TRUMPET43 TUBA44 BRASS HIT45 WIND ENS46 ENGLISH HORN47 OBOE48 BASSOON49 CLARINET

MODE

POWER OFF FINGERED

NORMAL CASIOCHORD

VOLUME

MIN MAX

PERCUSSION50 VIBRAPHONE51 MARIMBA52 CHURCH BELLS53 BELLS54 TOM55 ROCK DRUM56 SWING DRUM57 TRIANGLE58 SAMPLE PERCUSSION59 MATSURI

TEMPO

SYNTH-SOUND60 SYNTH-CELESTA61 SYNTH-CLAVI62 SYNTH-ACCORDION63 SYNTH-PIANO64 SYNTH-BRASS65 SYNTH-REED66 SYNTH-LEAD67 SYNTH-GUITAR68 SYNTH-STRINGS69 SYNTH-BASS

70 GRASS HARMONICA71 FANTASY72 WAW VOICE73 TWINKLE ECHO74 METAL LEAD75 PLUNK EXTEND76 COSMIC DANCE77 CATHEDRAL78 POP LEAD79 PEARL DROP

SOUND EFFECT80 AIRPLANE81 AMBULANCE82 INSECT83 EMERGENCY ALARM84 LASER BEAM85 COSMIC SOUND86 TELEPHONE87 CAR HORN88 COMPUTER SOUND89 MOTORCYCLE

KEYBOARD SPLIT90 BASS/VIBRAPHONE91 BASS/PIANO92 BASS/TRUMPET93 BASS/SYNTH-LEAD94 BASS/ELEC ORGAN95 STRINGS/BRASS96 CHORUS/BELLS97 BRASS/SYNTH-REED98 PIANO/FLUTE99 STRINGS/OBOE

TONE/RHYTHM SELECT TONEPOLY/TEXTURE43210

98765 RHYTHM DEMOFILL-IN START/ STOP

ROCK00 ROCK 101 ROCK 202 HARD ROCK 103 HARD ROCK 204 HARD ROCK 305 HEAVY METAL 106 HEAVY METAL 207 8 BEAT 108 8 BEAT 209 8 BEAT 3

100 RHYTHMS16 BEAT10 16 BEAT 111 16 BEAT 212 16 BEAT 313 16 BEAT 414 16 BEAT 515 16 BEAT 616 16 BEAT 717 16 BEAT 818 LATIN 16 BEAT 119 LATIN 16 BEAT 2

DISCO20 70'S DISCO21 EURO-BEAT 122 EURO-BEAT 223 EURO-BEAT 324 EURO-BEAT 425 HIP-HOP 126 HIP-HOP 227 HIP-HOP 328 TECNO-POP 129 TECNO-POP 2

DISCO30 FUNK 131 FUNK 232 FUNK 333 FUNK 434 FUNK 535 FUNK 636 FUNK 737 FUNK 838 FUNK 939 FUNK 10

POPS40 POPS 141 POPS 242 POPS 343 POPS 444 POPS 545 30' POPS46 60' POPS 147 60' POPS 248 60' POPS 349 60' POPS 4

OLDTIME ROCK50 ROCK'N'ROLL 151 ROCK'N'ROLL 252 ROCK'N'ROLL 353 MERSEY BEAT54 SLOW ROCK 155 SLOW ROCK 256 SLOW ROCK 357 DOO-WOP58 RHYTHM & BLUES59 BLUES

SWING60 SWING 161 SWING 262 SWING 363 SWING 464 BIG BAND 165 BIG BAND 266 BIG BAND 367 JAZZ WALTZ68 TAP-DANCE BEAT69 BOOGIE-WOOGIE

LATIN70 SAMBA 171 SAMBA 272 BOSSA NOVA 173 BOSSA NOVA 274 TANGO75 BEGUINE76 MAMBO77 RUMBA78 CHA-CHA-CHA79 HABANERA

VARIOUS80 REGGAE 181 REGGAE 282 SALSA 183 SALSA 284 SALSA 385 FOLKLORE 186 FOLKLORE 287 COUNTRY88 ENKA89 POLKA

90 GALOP 191 GALOP 292 MARCH 193 MARCH 294 WALTZ 195 WALTZ 296 CLASSICAL97 ELEC CLASSICAL98 STREET ORGAN99 KOTO

C C# EbD E F F# G Ab A Bb B C C# D Eb E F £ CHORD

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

C2 D2 E2 F2 G2 A2 B2 C3 D3 E3

CONTENTS

Specifications .................................................................. 2Block Diagram ................................................................. 3Circuit Description ........................................................... 3Troubleshooting ............................................................... 5Major Waveforms ............................................................ 8Schematic Diagrams ....................................................... 9PCB View ...................................................................... 11Exploded View ............................................................... 12Parts List ....................................................................... 13

SPECIFICATIONS

GENERAL

Number of keys: 49Polyphonic: 8-notePreset tones: 100Auto-rhythms: 100Auto-accompaniment: CASIO Chord/FingeredDemonstration tune: Classical MedleyBuilt-in speakers: 8 cm dia. 1.1 W Input Rating: 1 pc.Terminal: AC Adapter Jack (DC 7.5 V)Power source: 2-way AC or DC source

AC: AC adapterDC: 5 AA size dry batteries

Power consumption: 1.8 WDimensions(HWD): 63 x 650 x 217 mm

(2-1/2 x 25-9/16 x 8-1/2 inches)Weight: 1.4 kg (3.1 lbs) excluding batteries

ELECTRICAL

Current drain with 9V DC:No sound output 34 mA ± 20%Maximum volume 110 mA ± 20%

with keys C3, D3, E3 and F3 pressedin Church Organ tone, Volume; Maximum

Speaker Output Level at 4 Ω load: 510 mV ± 20 %with key E2 pressed in Church Organ toneVolume; Maximum

Minimum operating voltage: 5.5 V

Nomenclature of Keys

— 2 —

BLOCK DIAGRAM

CPU

MSM6387-22

LSI101

AmplifierAN8053N

IC101

Speaker

OscillatorQ102, X101

VDD

Keyboard

Buttons

FilterQ101

KO0 ~ KO8

KI0 ~ KI7

AVDD

CIRCUIT DESCRIPTIONKey Matrix

KO0 ~ KO9

MSM6387-13

KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7

KO0 0 1 C2 C#2 D2 D#2 E2 F2

KO1 2 3 F#2 G2 G#2 A2 A#2 B2

KO2 4 5 C3 C#3 D3 D#3 E3 F3

KO3 6 7 F#3 G3 G#3 A3 A#3 B3

KO4 8 9 C4 C#4 D4 D#4 E4 F4

KO5 Tone Rhythm F#4 G4 G#4 A4 A#4 B4

KO6Tempo

UpTempoDown

C5 C#5 D5 D#5 E5 F5

KO7Start/Stop

Fill-In F#5 G5 G#5 A5 A#5 B5

KO8 Demo C6

KO9 Normal FingeredCASIOChord

— 3 —

Pin No. Terminal In/Out Function

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

3 RESET In Power ON reset terminal. On: +5 V Off: 0 V

4 AVDD In +5 V source 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 COSI In 21.725 MHz clock pulse input

9 COSO — Not used

10 VDD In +5 V source

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

19, 20 KO11, KO10 — Not used

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

CPU (LSI101: MSM6387-13)

Containing a sound data ROM and a DAC (Digital to Analog Convertor), the CPU provides sound waveformin accodance with the pressed key and the selected tone.The following table shows the pin functions of LSI101.

Filter Block

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

AVDD

C108

Q1012SC1740SQ

C10

7

AG

R107R2106

C106

C10

9

AG

R105

AG

R10

4

R108

To power amp

From CPU

Amplifier/Voltage Regulator(IC101: AN8053N)

The right figure shows the internal block of IC101.

16 15 14 13 12 11 10 9

87654321

SP AMP VREF

5V REGPOWER

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

VCC NC CONT5V

VREG NCNC NC PRE GND

+

-

— 4 —

TROUBLESHOOTING

No powerPower indicator does not light up.

Connect an AC adapter into the power jack.

Does the keyboard work?

Measure voltage at pin 16 of IC AN8053N.

Is the voltage +6.8 V?

Check contact of the power jack.

Is it OK?

Replace the jack. Check soldering at pins of the power jack.

Is it OK?

Check D102.

If D102 is defect,replace it.

Solder the pins.

Check contact at battery springs.

Replace D101.

Check contact of power switch.

Clean the switch contacts.

No

Yes

No

Yes

No Yes

Yes No

— 5 —

No sound

Measure voltage at pin 13 of IC AN8053N.

Is the voltage +5 V ?

Measure voltage at pin 16 of IC AN8053N.

Is the voltage +6.8 V?

Follow flow chart of No Power.

Measure voltage at pin 14 of IC AN8053N.

Is the voltage 0 V?

Clean contacts of the power switch.

Replace IC AN8053N.

Turning power on, measure voltage at pin 3 of LSI MSM6387-13.

Does the voltage raisefrom 0 V to +5 V?

Clean contacts of thepower switch. A

Yes No

No

NoYes

Yes

No

— 6 —

A

Measure voltage at pins 22 ~ 30 of LSI MSM6387-13.

End

Is the voltage +0.3 V?

Replace LSI MSM6387-13.

Does the keyboard work?

Replace ceramic oscillator X101.

Does the keyboard work?

Replace transistor Q102.

Does the keyboard work?

Check the circuit aroundQ102 and X101.

Touch pin 5 of LSI MSM6387-13 with test rod (+) of multimeter in resistance range,

connecting test rod (-) to ground.

Is a noise made?

Touch pin 6 of IC AN8053N with test rod (+)of multimeter in resistance range,connecting test rod (-) to ground.

Is the noise made?

Using a multimeter, check conductivity of speaker at terminals on the main PCB.

Is it OK?

Replace speaker.

Replace LSI MSM6387-13.

Check filter circuit around Q101.

Yes No

Yes Yes

Yes

Yes

No

No

No

No

No

No

Yes

Replace ICAN8053N.

Yes

— 7 —

MAJOR WAVEFORMS

1

Clock pulse COSIMSM6387-13 pin 8

2

3

Key scan signal KO0MSM6387-13 pin 30

Key scan signal KO1MSM6387-13 pin 29

4

5

6

7

Sound signal output MSM6387-13 pin 5

Filter outputEmitter of Q201

Power amp inputLA4598 pin 6

Power amp output LA5498 pin 3

Tone : Flute (No.13)Key : A3Volume : Maximum

1 2

3

4

5

6

7

50 ns

CH1: 1V

2 ms

CH1: 5 V–

CH2: 5 V–~

~ ~

2 ms

CH1: 50 mV CH2: 0.5 VCH1: 50 mV CH2: 50 mV

2 ms

~ ~

CH1

CH1

CH2

CH1

CH2

CH1

CH2

6 Power amp inputAN8053N pin 6

7 Power amp outputAN8053N pin 1

2 Key scan signal KO0MSM6387-13 pin 30

3 Key scan signal KO1MSM6387-13 pin 29

1 Clock pulse COSIMSM6387-13 pin 8

4 Sound signal outputMSM6387-13 pin 5

5 Filter outputCollector of Q101

1

4

5

6

7

2

3

— 8 —

— 9 —

SCHEMATIC DIAGRAMS

1

4

2

5

7

6

3

— 10 —

— 11 —

PCB VIEW

Main PCB

1 423 6 75

— 12 —

R-1

R-2

1

10

9

12

2

13

3

4

8

7

11

5

6

EXPLODED VIEW

Notes: This parts list does not include the cosmetic parts, whichparts are marked with item No. "R-X" in the explodedview.Contact our spare parts department if you need theseparts for refurbish.

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", publishedseperately.

3. The numbers in item column correspond to the samenumbers in drawing.

PARTS LIST

MA-100

FOB JapanN Item Code No. Parts Name Specification Q N.R.Yen R

Unit PriceIC101 2114 3269 IC, Power Amp. AN8053N 1 ALSI101 2011 2961 LSI, CPU MSM6387-13 1 A

Q101, 102 2220 1387 Transistor 2SC1740SQ-TP-T 2 BD101 2390 1323 Diode RB100A-T32-T 1 BD102 2390 0371 Diode DSK10B-BT-T 1 BD103 2310 7848 Zener diode RD4. 3ESB2-T1-T 1 AX101 2590 1897 Ceramic oscillator EFO-EN2175C4 1 BJ101 3501 3731 Power jack HEC2305-01-250 1 A

N 1 6925 0500 PCB ass'y, MA1M M240352*1 1 BN 2 6925 0510 PCB ass'y, KY M240353*1 1 B

3 6921 5031 Slide knob M311859A-1 2 BN 4 6925 0540 Button, Rubber M240278-1 1 B

5 6909 5890 Slide contact CSB-12D 2 BN 6 3831 1029 Speaker 300RB03 1 BN 7 6925 0550 White key set, 19-key M140301-1 1 AN 8 6925 0560 Black key set, 13-key M140302-1 1 AN 9 6925 0570 White key set, 10-key M140303-1 1 AN 10 6925 0580 Black key set, 7-key M140304-1 1 AN 11 6925 0590 Key contact rubber, 32-contact M240287-1 1 BN 12 6925 0600 Key contact rubber, 17-contact M240288-1 1 B

13 6906 7511 Battery cover M312197A*3 1 B

Notes: N – New partsR – Rank

— 13 —

MA0400761A

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