ELECTRIONIC KEYBOARD
PK-5
(without price)
INDEX
CONTENTS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PCB View and Major Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
IC Lead Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Exploded Veiw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
-- 1 --
SPECIFICATIONS
General
Number of Keys:
32
Polyphonic:
2-note
Preset Tones:
16
Auto-Rhythms:
19;
Rock 1~2, 16 Beat 1~2, Disco 1~3, Pops 1~3, Slow Rock, Swing
March, Reggae, Tango, Samba, Bossa Nova, Beguine, Waltz
Accompaniment Patterns:
13;
Rock, Pops, Funk, Slow Rock, Latin, Jungle, Orient, Bagpiper,
Fanfare, Child's Play, Classical, Computer, New Age
Demonstration Tune:
Classical Medley
Built-In Speaker:
6.5 cm dia. 0.5 W Input Rating: 1 pec.
Power Source:
4 AA size dry batteries
Battery life: Approx. 3 hours (SUM-3/R6P)
Approx. 6 hours (AM-3/LR6)
Power Consumption:
0.7 W
Dimentions:
41 x 375 x 115 mm (HWD)
(1-5/8 x 14-3/4 x 4-1/2 inches) (HWD)
Weight:
0.4 kg (0.9 lbs) excluding batteries
Electrical
Current Drain with 6V DC:
No Sound Output
35 mA
± 20%
Maximum Volume
113 mA
± 20%
with keys C4 and E4 pressed in Flute tone
Volume: Maximum, Accmpaniment: Latin,
Tempo: Maximum
Minimum Operating Voltage:
5.0 V
BLOCK DIAGRAM
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
KO0~KO6
KI0~KI7
Keyboard
Switches
Oscillator
X1
Amplifier
AN8053N
IC1
Speaker
CPU
MSM6387-03
LSI1
-- 2 --
CIRCUIT DESCRIPTION
Key Matrix
CPU (LSI1: MSM6387-03)
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
Tone 0
Tone 1
Tone 2
Tone 3
Tone 4
Select
KO5
Tone 5
Tone 6
Tone 7
Tone 8
Tone 9
Stop
KO6
Demo
Tempo
Up
Tempo
Down
Volume
Up
Volume
Down
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