ELECTRIONIC KEYBOARD
M-200
(without price)
M-200
INDEX
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
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
, 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
SPECIFICATIONS
-- 1 --
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
Nomenclature of Keys
BLOCK DIAGRAM
-- 2 --
KO0~KO6
KI0~KI7
Keyboard
Switches
Oscillator
X1
Amplifier
AN8053N
IC1
Speakers
CPU
MSM6387-16
LSI1
VDD
Filter
T1
Output Jack
Key Matrix
CPU (LSI1: MSM6387-16)
Containing a sound data ROM and a DAC (Digital to Analog Convertor), the CPU provides sound wave-
form in accordance with the pressed key and the selected tone.
The following table shows the pin functions of LSI1.
CIRCUIT DESCRIPTION
-- 3 --
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
Funny
Accomp.
Tempo
Down
Volume
Down
Tempo
Up
Volume
Up
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