Casio Ma-100 Service Manual

MA-100

100 TONES
KEYBOARD

WIND

10

SAMBA WHISTLE
11 WHISTLE
12 QUENA
13 FLUTE
14 FLUTE-VIB
15 OCARINA
16 BAGPIPE
17

HARMONICA
18

CHORUS
19

BRASS-STRINGS

VOLUME

MIN MAX

STRING

20

WARM STRINGS
21 STRINGS
22 VIOLIN
23 VIOLIN-VIB
24 CELLO
25

ELEC GUITAR
26

JAZZ GUITAR
27

MUTE GUITAR
28

METAL GUITAR
29 SLAP BASS

00 PIANO
01 ELEC PIANO
02 FUNKY CLAVI
03 HARPSICHORD
04 ELEC ORGAN
05 JAZZ ORGAN
06 PIPE ORGAN
07

CHURCH ORGAN

08

STREET ORGAN

09 ACCORDION

MODE

POWER OFF FINGERED

NORMAL CASIO

CHORD

CC#EbDEFF#GAbABbBCC#DEbEF£CHORD

30

ELEC BASS

31

WOOD BASS

32

SNARE BASS
33 MANDOLIN
34 BANJO
35

SITAR
36

UKULELE
37

HARP
38

TAISHOKOTO
39 SHAMISEN

BRASS

40

BRASS ENS

41

WARM BRASS
42 TRUMPET
43 TUBA
44 BRASS HIT
45

WIND ENS
46

ENGLISH HORN
47

OBOE
48

BASSOON
49 CLARINET

PERCUSSION

50 VIBRAPHONE
51 MARIMBA
52 CHURCH BELLS
53 BELLS
54 TOM
55 ROCK DRUM
56 SWING DRUM

TRIANGLE

57
58

SAMPLE PERCUSSION

59 MATSURI

STOP

SYNTH-SOUND

60 SYNTH-CELESTA
61 SYNTH-CLAVI

SYNTH-ACCORDION

62
63 SYNTH-PIANO
64 SYNTH-BRASS
65 SYNTH-REED
66 SYNTH-LEAD
67 SYNTH-GUITAR
68 SYNTH-STRINGS
69 SYNTH-BASS

TEMPO

TONE/RHYTHM SELECT TONE

GRASS HARMONICA

70
71 FANTASY

WAW VOICE

72
73 TWINKLE ECHO
74 METAL LEAD
75 PLUNK EXTEND
76 COSMIC DANCE
77 CATHEDRAL
78 POP LEAD
79 PEARL DROP

SOUND EFFECT

80 AIRPLANE
81 AMBULANCE
82 INSECT

EMERGENCY ALARM

83
84 LASER BEAM

COSMIC SOUND

85
86 TELEPHONE
87 CAR HORN

COMPUTER SOUND

88
89

MOTORCYCLE

POLY/TEXTURE43210

98765

RHYTHM DEMOFILL-IN START/

KEYBOARD SPLIT

90

BASS/VIBRAPHONE

91

BASS/PIANO

92

BASS/TRUMPET

93

BASS/SYNTH-LEAD

94

BASS/ELEC ORGAN

95

STRINGS/BRASS

96 CHORUS/BELLS

BRASS/SYNTH-REED

97
98

PIANO/FLUTE

99

STRINGS/OBOE

100 RHYTHMS
ROCK

00 ROCK 1
01 ROCK 2
02 HARD ROCK 1
03 HARD ROCK 2
04 HARD ROCK 3
05 HEAVY METAL 1
06 HEAVY METAL 2

8 BEAT 1

07
08

8 BEAT 2

09

8 BEAT 3

OLDTIME ROCK

50 ROCK'N'ROLL 1
51 ROCK'N'ROLL 2
52 ROCK'N'ROLL 3
53 MERSEY BEAT
54 SLOW ROCK 1
55 SLOW ROCK 2
56 SLOW ROCK 3

DOO-WOP

57
58

RHYTHM & BLUES

59

BLUES

16 BEAT

10

16 BEAT 1

11

16 BEAT 2

12

16 BEAT 3

13

16 BEAT 4

14

16 BEAT 5

15

16 BEAT 6

16

16 BEAT 7

17

16 BEAT 8
18 LATIN
19 LATIN

SWING

60 SWING 1
61 SWING 2
62 SWING 3
63 SWING 4
64 BIG BAND 1
65 BIG BAND 2
66 BIG BAND 3

JAZZ WALTZ

67
68

TAP-DANCE BEAT
69

BOOGIE-WOOGIE

16 BEAT 1
16 BEAT 2

DISCO

20

70'S DISCO

21

EURO-BEAT 1

22

EURO-BEAT 2

23

EURO-BEAT 3

24

EURO-BEAT 4

25

HIP-HOP 1

26

HIP-HOP 2

27

HIP-HOP 3
28 TECNO-POP
29 TECNO-POP

LATIN

70 SAMBA 1
71 SAMBA 2

BOSSA NOVA 1

72
73

BOSSA NOVA 2
74 TANGO
75 BEGUINE
76 MAMBO
77 RUMBA

CHA-CHA-CHA

78
79

HABANERA

1
2

DISCO

30

FUNK 1

31

FUNK 2

32

FUNK 3

33

FUNK 4

34

FUNK 5

35

FUNK 6

36

FUNK 7

37

FUNK 8

38

FUNK 9

39

FUNK 10

VARIOUS

80 REGGAE 1
81 REGGAE 2
82 SALSA 1
83 SALSA 2
84 SALSA 3
85 FOLKLORE 1
86 FOLKLORE 2
87 COUNTRY

ENKA

88
89

POLKA

POPS

40 POPS

1

41 POPS

2

42 POPS

3

43 POPS

4

44 POPS

5
45 30' POPS
46 60' POPS 1
47 60' POPS 2
48 60' POPS 3
49 60' POPS 4

90 GALOP 1
91 GALOP 2
92 MARCH 1
93 MARCH 2
94 WALTZ 1
95 WALTZ 2
96 CLASSICAL

ELEC CLASSICAL

97
98

STREET ORGAN

99

KOTO

MA-100

ELECTRONIC KEYBOARD

CONTENTS

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

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

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

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

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

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

PCB View ......................................................................11

Exploded View...............................................................12

Parts List ....................................................................... 13

SPECIFICATIONS

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: 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 adapter

DC: 5 AA size dry batteries
Power consumption: 1.8 W
Dimensions(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 pressed
in Church Organ tone, Volume; Maximum

Speaker Output Level at 4 Ω load: 510 mV ± 20 %

with key E2 pressed in Church Organ tone
Volume; Maximum

Minimum operating voltage: 5.5 V

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

C2

C#2

D2

D#2

E2

F2

G2

B2 C3 D3 E3

A2

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

D#3

C5 D5 E5 F5 G5 A5 B5

C6

— 2 —

Speaker

Amplifier

AN8053N

IC101

BLOCK DIAGRAM

CPU

Filter
Q101

VDD

MSM6387-22

MSM6387-13

LSI101

KO0 ~ KO9

KO0 ~ KO8

KI0 ~
KI7

AVDD

Oscillator

Q102, X101

CIRCUIT DESCRIPTION

Key Matrix

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

Keyboard

Buttons

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

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

KO6

KO7

Tempo

Up

Start/

Stop

Tempo

Down

C5 C#5 D5 D#5 E5 F5

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

KO8 Demo C6

KO9 Normal Fingered

— 3 —

CASIO

Chord

CPU (LSI101: MSM6387-13)

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

Pin No. Terminal In/Out Function

1, 2 TEST1, TEST2

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

10 VDD In +5 V source

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

19, 20 KO11, KO10

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

—

—

—

Not used. Connected to ground.

Not used

Not used

Filter Block

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

AVDD

Q101
2SC1740SQ

C106

To power amp

R105

R104

AG

Amplifier/Voltage Regulator
(IC101: AN8053N)

The right figure shows the internal block of IC101.

R2106

C108

C107

AG

VCC NC CONT

16

15

POWER

R107

14 13

C109

AG

5V

VREG

5V REG

R108

From CPU

NCNC NC PRE GND

12 11

10

9

-

SP AMP

+

1

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

4

32

6

5

— 4 —

7

VREF

8

TROUBLESHOOTING

No power

Power indicator does not light up.

Connect an AC adapter into the power jack.

Does the keyboard work?

No

Measure voltage at pin 16 of IC AN8053N.

Is the voltage +6.8 V?

No

Check contact of the power jack.

No Yes

Is it OK?

Yes

Yes

Check contact at battery springs.

Replace D101.

Check contact of power switch.

Clean the switch contacts.

Replace the jack.

Yes

Check D102.

If D102 is defect,

replace it.

— 5 —

Check soldering at pins of the

power jack.

Is it OK?

No

Solder the pins.