Full Text Searchable PDF User Manual
ELECTRIONIC KEYBOARD
SK-60
SK-60
MELODY
ON/OFF
T I M E
S
M
L
1-2-3
1-2-3-4
1-2
C Y C L E
REVERSE
CLEAR
RELEASE
E F F E C T
LOOP
T U N E
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
SAMPLING MIC
1
2
3
4
5
6
1
2
3
4
— 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
µ
A (maximum)
Speaker output level (Vrms with 4
Ω
load):
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
I n / O u t
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 V
0 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
1
3
4
5
6
7
8
2
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
1
Clock pulse
MSM6755B-10 pin 32
2
Key scan signal KO6
MSM6755B-10 pin 72
3
Key scan signal KO7
MSM6755B-10 pin 73
1
2
3
4
Sound waveform
MSM6755B-10 pin 44
5
Mic. amp. input
Terminal PM-BL
6
Mic. amp. output
MSM6755B-10 pin 51
4
5
6
Tone:
No. 22
Key:
A4
— 8 —
2
1
4
6
3
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 —
3
4
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
5 A
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
1 C
D104
2390 0371
Diode
DSK10B-BT-T
1 C
2390 1344
Diode
1SS133T-77-T
20 C
LED101
2370 1106
LED
MPR3338S-B99
1 C
X1
2590 1526
Creamic oscillator
EFO-EN2005C4
1 B
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