Casio PK-5 User manual

ELECTRIONIC KEYBOARD

PK-5

(without price)

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

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

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

Amplifier/Voltage Regulator (IC1: AN8053N)

Consisting of an amplifier and a voltage regulator, AN8053N amplifies the sound signal from the CPU and

also provides the CPU +5V source.

The following figure shows the internal block diagram of IC1.

TROUBLESHOOTING

16 15 14 13 12 11 10 9

SP AMP VREF

5V REG

POWER

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

VCC NC CONT 5V

VREG NCNC NC PRE GND

— 4 —

Checkpoint

Pin 13 should have +5 V.

An amplified waveform should be observed at pin

Voltage at pin 3 of the CPU should be raised from

0V to +5 V when the power switch is turned on.

Switch contact.

Pins 24 ~ 30 should provide pulses.

Pin 5 should provide a sound waveform when a

key is pressed.

Pins 8 and 9 of the CPU should receive an oscil-

lation signal.

Nature of Trouble

No sound at all

Certain key(s) or

switch(es) do(es) not

work.

Faulty Block

Power amp.

(IC: AN8053N)

Power Switch

CPU

(LSI1: MSM6387-03)

Oscillator (X1)

Key or Switch Contact

Open Circuit on KO or KI

Lines

PCB VIEW and MAJOR WAVEFORMS

M3205-MA1M PCB

— 5 —

Clock pulse COSO

MSM6387-03 Pin 9 Key scan signal KO0

MSM6387-03 Pin 30

Key scan signal KO1

MSM6387-03 Pin 29

Sound output

MSM6387-03 Pin 5

Tone : Piano

Key : G4

Power Amp. output

AN8053N Pin 1

Tone : Piano

Key : G4

Volume : Max.

— 6 —

SCHEMATIC DIAGRAM

6.0

0.5

5.2

4.8

2.5

2.2

4.9

0.0

5.2

0.0

3.9

3.1

4.0

M3210-MA1M PCB

LSI1: MSM6387-03

TEST2

TEST1

RESET

GND

AVDD

OUT

AGND

COSI

COSO

VDD

KI0

KI1

KI2

KI3

KI4

KO0

KO1

KO2

KO6

KO3

KO4

KO5

KO7

KO8

KO9

KO10

KO11

KI7

KI6

KI5

SPO

SPG

PC-1

PC-2

SPI

SPM

VREF

VCC

CONT

VREG

PR GND

IC1: AN8053N

IC LEAD IDENTIFICATION

— 7 —

EXPLODED VIEW

— 8 —

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