Casio SK-60 User manual

ELECTRIONIC KEYBOARD
SK-60
SK-60
MELODY
ON/OFF
TIME
SML
 1-2-3
 1-2-3-4
 1-2
CYCLE
REVERSE CLEAR
RELEASE
EFFECT
LOOP
TUNE
RESET
36
TONES
12 FREE SESSIONS
11
12
13
14
15
16
21
22
23
24
25
26
31
52
53
54
55
56
61
62
63
64
65
66
32
33
34
35
36
41
42
43
44
45
46
51
@

11
12
13
14
15
16
21
22
23
24
25
26
31
32
33
34
35
36
41
42
43
44
45
46
51
52
53
54
55
56
61
62
63
64
65
66
POPS 1
BIG BAND
SWING
FOX TROT
POPS 2
WALTZ 1
WALTZ 2
POLKA
SKA
TEX-MEX
COUNTRY
BAROQUE
MARY HAD A LITTLE LAMB
AMAZING GRACE
ACH DU LIEBER AUGUSTIN
LONDON BRIDGE
JOY TO THE WORLD
GREENSLEEVES
JINGLE BELLS
SILENT NIGHT
O CHRISTMAS TREE
YANKEE DOODLE
SANTA LUCIA
MARCH FROM “THE NUTCRACKER”
VOICES OF REASON (ORIGINAL SONG)
TWINKLE TWINKLE LITTLE STAR
DOOIN’ MY THING (ORIGINAL SONG)
ODE TO JOY
LITTLE BROWN JUG
SPRING FROM “THE FOUR SEASONS”
WHEN THE SAINTS GO MARCHING IN
FRÈRE JACQUES
OLD MacDONALD HAD A FARM
AULD LANG SYNE
LONDONDERRY AIR
ROW, ROW, ROW YOUR BOAT
DOO1 (MALE)
DOO2 (MALE)
BAH (BASS)
BOM (BASS)
VOICE PERCUSSION 
DOO-BEE
BOM-BAH
DOO-BEE-DEE
DOO-BEE-BAH
DOO-BEE-DEE-BAH
DOO-BEE-DOO-BAH
SIREN 2
TELEPHONE
SPACE 1
SPACE 2
FUNNY
DOO (FEMALE)
BEE (FEMALE)
DEE (FEMALE)
BAH (FEMALE)
AHH (CHOIR)
OOH (CHOIR)
LA (CHILDREN)
PIANO
ELEC PIANO
ORGAN
ACCORDION
GUITAR
VIBRAPHONE
VIOLIN
STRINGS
TRUMPET
CLARINET
SAX
FLUTE
SIREN 1
HUMAN VOICE HUMAN VOICE

(CYCLE)
36
SONG BANK

24
SONGS
POWER
ON
OFF
VOLUME TEMPO TONE
SONG BANK
START/
STOP MAGICAL
SINGER
PAD
EFFECT SAMPLE
EDIT SAMPLING
PAD
A
C
B
D
S
A
M
P
L
I
N
G
M
I
C
123
456
12
34

— 2 —
CONTENTS
Specifications .......................................................................................................................... 2
Block Diagram......................................................................................................................... 3
Circuit Description ................................................................................................................... 4
Major Waveforms .................................................................................................................... 7
Printed Circuit Board ...............................................................................................................8
Schematic Diagrams ............................................................................................................... 9
Exploded View ...................................................................................................................... 11
Parts List ............................................................................................................................... 13
SPECIFICATIONS
GENERAL
Number of keys: 32
Polyphonic: 12-note
Preset tones: 18
Human voice tones: 12
Voice cycles: 6
Song bank: 24-tune
Free sessions: 12
Pads: 4
Pad settings: Sampled sounds, effects, voice percussion
Sampling method: 8-bit Differential Pulse Coded Modulation (DPCM)
Sampling rate: 13,021 kHz
Sampling duration: 2.4 seconds maximum
Tuning control: Approx. 440 Hz
Built-in speakers: 4 inch dia. 2 W input rating: 2 pcs
Terminals: 7.5 V DC
Power source: 2-way AC or DC source
AC: AC adapter
DC: 5 AA size dry batteries
Power consumption: 2.0 W
Dimensions(HWD): 416 ×222 ×530 mm (16-3/8 ×8-6/8 ×20-7/8 inches)
Weight: 1.0 kg (2.2 lbs) excluding batteries
ELECTRICAL
Current drain with 7.5 V DC:
No sound output 50 mA ±20%
Maximum volume 200 mA ±20%
with white keys F4 to C6 pressed in Bah tone (No. 44)
Power off 80 µA (maximum)
Speaker output level (Vrms with 4 Ωload):
with key C4 pressed in Accordion tone 480 mV ±20%
Volume: maximum
Minimum operating voltage 5.8 V

— 3 —
CPU
LSI1
MSM6755B-10 Keyboard
Buttons
PG
Q1, X1
Reset IC
IC1
RE5VL40AA
Q103
Voltage Regulator
Q101, Q102, D102
Mic. Amp.
Q105, Q106
Mic. input
VCC  DVDD
AVDD
Power Supply Circuit
APO
MD0 ~ MD7 MA0 ~ MA14
RAM (256 Kbit)
LSI2
HM62256BLSP-8
KI0 ~ KI3
KO0 ~ KO7
KI4 ~ KI7
Amp./Voltage Regulator
IC101
AN8053N
BLOCK DIAGRAM

— 4 —
KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7
KO0 (SO0) F3 C#4 A4 F5 A 1 1 Song
KO1 (SO1) F#3 D4 A#4 F#5 B 2 2 Start/
Stop
KO2 (SO2) G3 D#4 B4 G5 C 3 3 Melody
On/Off
KO3 (SO3) G#3 E4 C5 G#5 D 4 4 Tone
KO4 (SO4) A3 F4 C#5 A5 Volume
Up Magical Singer 5
KO5 (SO5) A#3 F#4 D5 A#5 Volume
Down Sampling 6
KO6 (SO6) B3 G4 D#5 B5 Tempo
Up Edit Effect
KO7 (SO7) C4 G#4 E5 C6 Tempo
Down
CIRCUIT DESCRIPTION
KEY MATRIX
NOMENCLATURE OF KEYS
F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6
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

— 5 —
Pin No. Terminal In/Out Function
1 MA14 Out Address bus
2 MWEB Out Write enable signal output
3 NC0 — Not used.
4 ~ 19 MA0 ~ MA13 Out Address bus
13 MRDB Out Read enable signal output
17 MCSB Out Chip select signal for the RAM
20 ~ 27 MD0 ~ MD7 In/Out Data bus
28, 29 NC1, NC2 — Not used.
30 DGND In Ground source
31 DVCC In +5 V source
32, 33 XTL0, XTL1 In/Out 20 MHz clock input/output
34 NC3 — Not used.
35 RSTB In Reset signal input
36 RXD — Not used. Connected to +5 V.
37 TXD — Not used.
38 NMI In Power ON signal input
39 APO Out APO(Auto Power Off) signal output
40 NC4 — Not used.
41 REFH Out Terminal for the built-in DAC/ADC
42, 43 NC5, NC6 — Not used.
44 DAOR Out Sound waveform output
45 NC7 — Not used.
46 AVdac In +5 V source for the built-in DAC/ADC
47 DAOL — Not used.
48 REFL Out Terminal for the built-in DAC/ADC
49 AGdac — Not used.
50 AGadc In Ground source for the built-in ADC
51 ANI In Analog signal input
52 AVadc In +5 V source for the built-in ADC
53 NC8 — Not used.
54 MOD0 In Mode selection terminal
55, 56 MOD1, MOD2 In Mode selection terminal
57 P40 In APO cancellation signal input
58 ~ 65 KI0 ~ KI7 In Terminals for key/button input signal
66 ~ 73 KO1 ~ KO8 Out Terminals for key scan signal
74 ~ 78 — — Not used.
79 LVCC In +5 V source
80 ~ 95 — — Not used.
96 LGND In Ground source
97 ~ 100 — — Not used.
CPU (LSI1: MSM6755B-10)
Containing a sound data ROM and a DAC (Digital to Analog Convertor), the CPU provides sound waveform
in accordance with the pressed key and the selected tone. The CPU also records the voice picked up the
microphone, using the built-in ADC (Analog to Digital Convertor) and the RAM.
The following table shows the pin functions of LSI1.

— 6 —
Oscillator
20 MHz
CPU
APO
DVDD
DVDD
From power switch
SWITCH: OFF ON
+5 V +5 V0 V
APO: "L" "H"
+7.5 V 0 V
AMPLIFIER/VOLTAGE REGULATOR (IC101: AN8053N)
The right figure shows the internal block of IC 101.
16 9
SP AMP
–
+VREF
5V REG
POWER
13456782
15 14 13 12 11 10
VCC NC CONT 5 V VREG NC NC NC PRE GND
SPO NC SP GND PC-1 PC-2 SPI SPM VREF
POWER SUPPLY CIRCUIT
The power supply circuit generates two voltages DVDD (+5 V) and AVDD (+5 V). DVDD (+5 V) is always
generated but AVDD (+5 V) is controlled by APO signal output from the CPU.
OSCILLATOR
+5 V source of the oscillator is controlled by transistor Q107. When selecting the power switch at on position,
transistor Q107 turns on to become 20 MHz oscillation on. To keep the oscillation on, the CPU provides "H"
of APO signal.

— 7 —
MAJOR WAVEFORMS
1Clock pulse
MSM6755B-10 pin 32 2Key scan signal KO6 MSM6755B-10 pin 72
3Key scan signal KO7
MSM6755B-10 pin 73
12
3
4Sound waveform
MSM6755B-10 pin 44 5Mic. amp. input Terminal PM-BL
6Mic. amp. output
MSM6755B-10 pin 51
4
5
6
Tone: No. 22
Key: A4

— 8 —
2 1 4 63 5
PRINTED CIRCUIT BOARD
Main PCB KDM415-MA1M

— 9 —
1
2
3
4
5
6
SCHEMATIC DIAGRAMS
Main PCB KDM415-MA1M/KY2M

— 10 —
Keyboard PCB KDM415-KY1M

EXPLODED VIEW
— 11 —
34
7
8
10
11
12
9
1
2
5
6
R-1
R-3
R-2

Notes: This parts list does not include the cosmetic parts, which
parts are marked with item No. "R-X" in the exploded
view.
Contact our spare parts department if you need these
parts for refurbish.
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
SK-60

Item Code No. Parts Name Specification Q R
Main PCB
1 6925 4540 Main PCB ass'y M415-MA1M M140426*1 1 B
LSI1 2012 3738 LSI, CPU MSM6755B-10 1 A
LSI2 2012 3731 LSI, RAM HM62256BLSP-8 1 A
IC1 2105 5922 IC RE5VL40AA-TZ 1 A
IC101 2114 3269 IC AN8053N 1 A
2220 1387 Transistor 2SC1740SQ-TP-T 5A
Q102 2251 0469 Transistor 2SB1237Q,R-TV6-T 1 A
Q107 2200 2449 Transistor 2SA933SQ-TP-T 1 A
D1 2390 2828 Diode RB441Q-40T-77 1 B
D101 2360 1554 Diode, Zener MTZJ5.1B-T77-T 1 B
D102 2360 1085 Diode, Zener HZS6B1LTD-T 1 B
D103 2390 1323 Diode RB100A-T32-T 1C
D104 2390 0371 Diode DSK10B-BT-T 1C
2390 1344 Diode 1SS133T-77-T 20 C
LED101 2370 1106 LED MPR3338S-B99 1 C
X1 2590 1526 Creamic oscillator EFO-EN2005C4 1B
J101 3501 3780 Jack, Power HEC2305-01-250 1 B
Keyboard PCBs
2 6925 4550 Keyboard PCB ass'y, M415KY1,2M M140427*1 1 B
2390 1344 Diode 1SS133T-77-T 32 C
Mechanical Parts
3 3831 1064 Speaker S08JA32A 1 B
4 6909 5890 Slide contact CSB-12D 1 B
5 3830 9021 Microphone WM-034CY 1 B
6 6925 4560 Rubber button M240409-1 1 B
7 6925 4570 Rubber button M240410-1 1 B
8 6925 4580 Black key set, LNM32 M110553-4 1 A
9 6925 4590 White key set, NM32-B M140416-1 1 A
10 6925 4600 Key contact rubber M240448-1 1 A
11 6925 4610 Slide knob M311360-3 1 B
12 6925 4620 Battery cover M311200*13 1 B
Notes: Q – Used quantity
R – Rank
— 13 —

MA0700761A