Casio_PK-5_Service_Manual.pdf

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PK-5
INDEX
ELECTRIONIC KEYBOARD
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
SPECIFICATIONS
General
Number of Keys:
Polyphonic:
Preset Tones:
Auto-Rhythms:
Accompaniment Patterns:
Demonstration Tune:
Built-In Speaker:
Power Source:
32
2-note
16
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
13; Rock, Pops, Funk, Slow Rock, Latin, Jungle, Orient, Bagpiper,
Fanfare, Child's Play, Classical, Computer, New Age
Classical Medley
6.5 cm dia. 0.5 W Input Rating: 1 pec.
4 AA size dry batteries
Battery life: Approx. 3 hours (SUM-3/R6P)
Approx. 6 hours (AM-3/LR6)
0.7 W
41 x 375 x 115 mm (HWD)
(1-5/8 x 14-3/4 x 4-1/2 inches) (HWD)
0.4 kg (0.9 lbs) excluding batteries
Power Consumption:
Dimentions:
Weight:
Electrical
Current Drain with 6V DC:
No Sound Output
Maximum Volume
with keys C4 and E4 pressed in Flute tone
Volume: Maximum, Accmpaniment: Latin,
Tempo: Maximum
Minimum Operating Voltage:
35 mA
±
20%
113 mA
±
20%
5.0 V
—1—
BLOCK DIAGRAM
KO0~KO6
CPU
Amplifier
AN8053N
IC1
Speaker
Keyboard
MSM6387-03
KI0~KI7
LSI1
Switches
Oscillator
X1
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—
CIRCUIT DESCRIPTION
Key Matrix
KI0
KO0
KO1
KO2
KO3
KO4
KO5
KO6
F3
C#4
A4
F5
Tone 0
Tone 5
KI1
F#3
D4
A#4
F#5
Tone 1
Tone 6
KI2
G3
D#4
B4
G5
Tone 2
Tone 7
KI3
G#3
E4
C5
G#5
Tone 3
Tone 8
KI4
A3
F4
C#5
A5
Tone 4
Tone 9
KI5
A#3
F#4
D5
A#5
Tempo
Up
Stop
KI6
B3
G4
D#5
B5
Volume
Up
Tempo
Down
KI7
C4
G#4
E5
C6
Select
Volume
Down
Demo
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.
Pin No.
1, 2
3
4
5
6
7
8, 9
10
11 ~ 18
19 ~ 23
24 ~ 30
Terminal
TEST1, TEST2
RESET
AVDD
OUT
AGND
GND
COSI, COSO
VDD
KI0 ~ KI7
KO11 ~ KO7
KO6 ~ KO0
In/ Out
In
In
Out
In
In
In/Out
In
In
Out
Function
Not used. Connected to ground.
Power ON reset input. On: +6 V Off: 0 V
+5 V sorce for the built-in DAC
Sound waveform output
Ground (0 V) source for the built-in DAC
Ground (0 V) source
21.725 MHz clock pulse input/output
+5 V source
Input terminal from keys and switches
Not used.
Key and switch scan signal output
—3—

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