ELECTRIONIC KEYBOARD
M-100
(without price)
M-100
INDEX
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PCB View and Major Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
IC Lead Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
CONTENTS
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
General
Number of Keys:
32
Polyphonic:
2-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 Tune:
Twinkle Twinkle Little Star
Oh! Susanna
Lullaby (Brahms)
Little Brown Jug
Jingle Bells
Built-In Speaker:
6.5 cm dia. 1.0 W Input Rating: 1 pce.
Terminals:
Output Jack [Output Impedance:120
, Output Voltage: 1.6 V (rms) MAX]
AC Adapter Jack (DV 7.5 V)
Power Source:
DC: 4 AA size dry batteries
Battery life: Approx. 5 hours (SUM-3/R6P)
AC: AC Adapter AD-1
Power Consumption:
0.6 W
Dimensions (HWD):
41 x 382 x 125 mm
(1-5/8 x 15 x 5 inches)
Weight:
0.5 kg (1.1 lbs) including batteries
SPECIFICATIONS
-- 1 --
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
C5
D5
E5
F5
G5
A5
B5
C6
-- 2 --
BLOCK DIAGRAM
KO0~KO6
KI0~KI7
Keyboard
Switches
Oscillator
X1
Amplifier
AN8053N
IC1
Speaker
CPU
MSM6387-16
LSI1
VDD
Output Jack
CIRCUIT DESCRIPTION
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.
-- 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
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 ~ 23
KO11 ~ KO7
Not used.
24 ~ 30
KO6 ~ KO0
Out
Key and switch scan signal output