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
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

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
8
7
6
5
4
32
1
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
1.
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 —
2
1
3
45
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
1
23
4
5
6.0
0.5 0.5 0.5 0.5 0.5 0.5 0.5
5.2 4.8 2.5
2.2 2.2 4.9
0.0
0.0 0.0
0.0 5.2 0.0
0.0 3.9 3.1 4.0 4.0
M3210-MA1M PCB

LSI1: MSM6387-03
30 29 28 24 27 26 25 23 22 21 20 19 18 17 16
TEST2
TEST1 RESET GND AVDD OUT AGND COSI COSO VDD KI0 KI1 KI2 KI3 KI4
1 2 3 7 4 5 6 8 9
10 11 12 13 14 15
KO0 KO1 KO2 KO6 KO3 KO4 KO5 KO7 KO8 KO9
KO10 KO11
KI7 KI6 KI5
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
SPO NC SPG PC-1 PC-2 SPI SPM VREF
VCC
NC
CONT
VREG
NC NC NC
PR GND
IC1: AN8053N
IC LEAD IDENTIFICATION
— 7 —

EXPLODED VIEW
— 8 —
7
A
3
8
9
04
5
6
1
C
2
B
D

Notes: 1. Prices and specifications are subject to change with-
out prior notice.
2. As for spare parts order and supply, refer to the
"GUIDEBOOK for Spare parts Supply", published
seperately.
3. The numbers in item column correspond to the same
numbers in drawing.
PARTS LIST
PK-5

FOB Japan
N Item Code No. Parts Name Specification Q M N.R.Yen R *
Unit Price
Electrical Parts
C1/2 2807 1531 Electrolytic capacitor 10RE3-470-T2-T 2 20 C A
C3/4 2807 6392 Electrolytic capacitor 10RE3-22-T2-T 2 20 C A
C5 2813 1771 Semiconductive capacitor DD405SR393K16-T 1 10 C A
C6 2807 6378 Electrolytic capacitor 50RE3-1-T2-T 1 20 C A
C7 2801 9100 Electrolytic capacitor 6.3RE3-100-T2-T 1 20 C A
C8 2801 9660 Electrolytic capacitor 6.3RE3-220-T2-T 1 20 C A
D1 2301 0241 Diode 1SS254T-77-T 1 20 C A
FB1/2 3035 0266 Ferrite beads BL02RN2-R62T4-T 2 10 C A
N IC1 2114 3269 IC AN8053N 1 1 A B
LSI1 2010 8260 LSI MSM6387-03SS-106 1 1 A I
R3 2606 1141 Carbon film resistor R-20-1K-J-T23-T 1 20 C A
R4 2606 1554 Carbon film resistor R-20-120K-J-T23-T 1 20 C A
R5 2606 1239 Carbon film resistor R-20-8.2K-J-T23-T 1 20 C A
R6 2606 1274 Carbon film resistor R-20-1.5K-J-T23-T 1 20 C A
R7 2606 1169 Carbon film resistor R-20-100-J-T23-T 1 20 C A
X1 2590 0742 Ceramic oscillator EFO-GC2175C3 1 1 A B
4317 4031 Blank PCB M3205-MA1M M111705A-1 1 1 C B
6917 1762 Battery spring (+) M410913B-1 1 20 B A
6921 6211 Battery spring (-) M412171A-1 1 20 B A
1 PCB ass'y M3205-MA1M M211679*1 1 1 B
Mechanical Parts
2 3831 0525 Speaker KUE-65RGF02A 1 1 B C
3 6909 7380 SL contact 09D CSB-09D 1 20 B A
4 6917 1571 White key set M210 M210610A-1 1 5 A B
5 6917 1580 Black key set M210 M210609-1 1 10 A A
6 6917 1591 Contact rubber M210 M210605A-1 1 5 B B
7 6917 1610 Slide knob 210 M310807-1 1 20 C A
8 6917 1630 Button 210A M310824-1 1 20 B A
9 6917 1640 Button 210B M310825-1 1 10 B A
N 10 6917 1730 Button 210B M310825-2 1 5 B B
N 11 Top case 205B M111690-2 1 1 C
N 12 Bottom case 205B M111691-2 1 1 C
13 Screw 2.2 x 6 3 20 C
14 Screw 2.30 x 8 ZMC-3 6 20 C
The parts having a blank in their code No. column should be ordered from C.M.F.G.
Notes: N – New parts
M – Minimum order/supply quantity
R – Rank — 9 —

8-11-10, Nishi-Shinjuku
Shinjuku-ku, Tokyo 160, Japan
Telephone: [phone] May, 1994