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POWER/MODE
FINGERED
CASIO CHORD
NORMAL
OFF
ON
VOLUME
SYNCHRO/
FILL-IN
START/
STOP
TEMPO
TRANSPOSE/
TUNE
PIANO
00 PIANO 1
01 PIANO 2
02 HONKY-TONK
03 STUDIO PIANO
04 ELEC PIANO 1
05 ELEC PIANO 2
06 ELEC PIANO 3
07 ELEC PIANO 4
08 HARPSICHORD
09 CLAVELECTRO
100 TONES
ORGAN
10 ELEC ORGAN 1
11 ELEC ORGAN 2
12 ELEC ORGAN 3
13 ELEC ORGAN 4
14 CHURCH ORGAN
15 PIPE ORGAN
16 REED ORGAN
17 ACCORDION
18 BANDONEON
19 HARMONICA
GUITAR/BASS
20 GUT GUITAR
21 ACOUS GUITAR
22 JAZZ GUITAR
23 ELEC GUITAR
24 MUTE GUITAR
25 DIST GUITAR
26 WOOD BASS
27 ELEC BASS
28 SLAP BASS
29 BANJO
STRINGS/ENSEMBLE
30 VIOLIN
31 CELLO
32 HARP
33 STRINGS 1
34 STRINGS 2
35 STRINGS 3
36 SYNTH-STR 1
37 SYNTH-STR 2
38 CHIOR
39 VOICE
BRASS
40 TRUMPET
41 TUBA
42 BRASS SECTION
43 FRENCH HORN 1
44 FRENCH HORN 2
45 BRASS 1
46 BRASS 2
47 SYNTH-BRASS 1
48 SYNTH-BRASS 2
49 SYNTH-BRASS 3
REED/PIPE
50 SOPRANO SAX
51 ALTO SAX
52 TENOR SAX
53 OBOE
54 CLARINET
55 PICCORO
56 FLUTE
57 RECORDER
58 FLUTE ENSEMBLE
59 WHISTLE
SYNTH-SOUND 1
60 SYNTH-LEAD 1
61 SYNTH-LEAD 2
62 SYNTH-LEAD 3
63 SYNTH-CALLIOPE
64 SYNTH-PAD 1
65 SYNTH-PAD 2
66 SYNTH-PAD 3
67 GRASS HARMONICA
68 COUNTRY FARM
69 SYNTH-BASS
SYNTH-SOUND 2
70 PEAL DROP
71 COSMIC SOUND
72 SOUNDTRACK
73 SPACE PAD
74 SYNTH-SFX
75 SE 1 (VEHICLE)
76 SE 2 (TELEPHONE)
77 SE 3 (SPACE)
78 SE 4 (INVADER)
79 SE 5 (FUNNY)
LAYER
80 STRINGS PIANO
81 STRINGS EP
82 CHOIR EP
83 CHOIR ORGAN
84 STRINGS GUITAR
85 STRINGS HARP
86 BRASS STRINGS
87 VIB PAD
88 12 STR GUITAR
89 CHOIR STRINGS
SPLIT/PERCUSSION
90 BRASS/PIANO
91 BRASS/E.PIANO
92 BRASS/VIB
93 BRASS/G.GUITAR
94 BRASS/D.GUITAR
95 STRINGS/PIANO
96 STRINGS/TRUMPET
97 VIBRAPHONE
98 MARIMBA
99 PERCUSSION
POPS
00 POP FUSION
01 BALLAD
02 POP BALLAD
03 RAP POP
04 SOUL BALLAD
05 FUNKY POP
06 16 BEAT
07 8 BEAT 1
08 8 BEAT 2
09 POPS
50 RHYTHMS
20 SONG BANK
ROCK
10 ROCK WALTZ
11 SLOW ROCK
12 SOFT ROCK 1
13 SOFT ROCK 2
14 FOLKIE POP
15 60' S SOUL
16 ROCK
17 HEAVY METAL
18 50'S ROCK
19 CHICAGO BLUES
JAZZ/DANCE
20 BIG BAND
21 SLOW SWING
22 FOX TROT
23 JAZZ WALTZ
24 ACID JAZZ
25 LATIM FUSION
26 TRANCE
27 DISCO
28 RAP
29 FUNK
EUROPEAN/LATIN
30 POLKA
31 MARCH
32 SLOW WALTZ
33 WALTZ
34 TANGO
35 BOSSA NOVA
36 SAMBA
37 MAMBO
38 RHUMBA
39 CHA-CHA-CHA
VARIOUS
40 MERENGUE
41 RAGGAE
42 SKA
43 TEX-MEX
44 FOLKLORE
45 COUNTRY
46 SLOW GOSPEL
47 ADANI
48 BAROQUE
49 ENKA
00 SERENADE "EINE KLEINE NACHTMUSIK"
01 TWINKLE TWINKLE LITTLE STAR
02 ACH DU LIEBER AUGUSTIN
03 AMAZING GRACE
04 ODE TO JOY
05 LONDON BRIDGE
06 LONDONDERRY AIR
07 GREENSLEEVES
08 AULD LANG SYNE
09 JOY TO THE WORLD
10 JINGLE BELLS
11
12 YANKEE DOODLE
13 SANTA LUCIA
14 WHEN THE SAINTS GO MARCHING IN
15 ALOHA OE
16 SPRING FROM "THE FOUR SEASONS"
17 LITTLE BROWN JUG
18 MARCH FROM "THE NUTCRACKER"
19 THE ENTERTAINER
O CHRISTMAS TREE
0
TONE
RHYTHM
SONG
BANK
MELODY
ON/OFF
5
1
6
2
7
3
8
4
9
MULTI FUNCTION DISPLAY
ELECTRIONIC KEYBOARD
CTK-330
CTK-330


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-- 2 --
CONTENTS
Specifications .......................................................................................................................... 2
Block Diagram ......................................................................................................................... 3
Circuit Description ................................................................................................................... 4
Major Waveforms .................................................................................................................... 7
Schematic Diagrams ............................................................................................................... 8
Printed Circuit Board ............................................................................................................. 10
Exploded View ...................................................................................................................... 11
Parts List ............................................................................................................................... 13
SPECIFICATIONS
GENERAL
Number of keys:
49
Polyphonic:
12-note
Preset tones:
100
Auto-rhythms:
50, Tempo control: 40 to 255
Accompaniment:
Casio Chord, Fingered
Song bank:
20-tune
Tuning control:
440 Hz
± 50 cents
Built-in speakers:
4 inch dia. 2 W input rating: 2 pcs
Terminals:
Stereo standard Jack (Output impedance: 100 ohm, Output voltage: 3 V (rms)
MAX
Power source:
2-way AC or DC source
AC: AC adapter
DC: 6 AA size dry batteries
Power consumption:
7.2 W
Dimensions(HWD):
988
× 311 × 125 mm (38-15/16 × 12-1/4 × 4-15/16 inches)
Weight:
3.5 kg (7.7 lbs) excluding batteries
ELECTRICAL
Current drain with 9 V DC:
No sound output
120 mA
± 30%
Maximum volume
650 mA
± 30%
with white keys C1 to G2 pressed in Synth-Lead 1
Volume: 9
Phone output Level (Vrms with 8 ohm load each channel):
with key E3 pressed in Synth-Lead 1
80 mV
± 30%
Sound Pressure (at 10 cm away from speaker):
with key E3 pressed in Synth-Lead 1
100 dB
± 10 dB
Minimum operating voltage:
6.0 V


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--
3
--
CPU
MSM 6755B-08
LSI101
Keyboard
Buttons
LED
Reset IC
IC102
Oscillator
X101, Q107
Q111
Power Supply Circuit
Q101 ~ Q104, D106
Power Amp.
LA4598
IC101
Filter (L)
Q105
Filter (R)
Q106
Output
DC+9V IN
VC
AVDD DVDD LVDD
APO
CC1 ~ CC3
La ~ Lg,
Lp
KO8 ~
KO11
KI0 ~ KI7
KO0 ~ KO7
BLOCK DIAGRAM


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-- 2 --
KI0
KI1
KI2
KI3
KI4
KI5
KI6
KI7
KO0
C2
G#2
E3
C4
G#4
E5
C6
KO1
C#2
A2
F3
C#4
A4
F5
KO2
D2
A#2
F#3
D4
A#4
F#5
KO3
D#2
B2
G3
D#4
B4
G5
KO4
E2
C3
G#3
E4
C5
G#5
KO5
F2
C#3
A3
F4
C#5
A5
KO6
F#2
D3
A#3
F#4
D5
A#5
KO7
G2
D#3
B3
G4
D#5
B5
KO8
0
1
2
3
4
Start/Stop
Tempo
Up
Volume
Up
KO9
56
78
9
Tempo
Down
Volume
Down
Synchro/
Fill-In
KO10
Tone
Rhythm
Song
Bank
Melody
On/Off
KO11
Fingered
CASIO
Chord
Normal
Power Off
CIRCUIT DESCRIPTION
KEY MATRIX
NOMENCLATURE OF KEYS
C2
C#2 D#2
F#2 G#2
A#2
C#3 D#3
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
D2
E2
F2
G2
A2
B2
C3
D3
E3
F3
G3
A3
B3
C4
D4
E4
F4
G4
A4
B4
C5
D5
E5
F5
G5
A5
B5
C6


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-- 3 --
Amp.
LA4598
Filter
Block
CPU
MSM6755B-08
Pin No.
Terminal
In/Out
Function
1 ~ 29
MA14 ~ NC2
--
Not used.
30
DGND
In
Ground (0 V) source
31
DVCC
In
+5 V source
32, 33
XTLO, XTLI
In/Out
20 MHz clock input/output
34
NC3
--
Not used. Connected to ground.
35
RSTB
In
Reset signal input
36
P24/RXD
--
Not used. Connected to +5 V.
37
P25/TXD
--
Not used.
38
NMI
In
Power on signal input. Connected to +5 V.
39
APO
Out
APO (Auto Power Off) signal output
40
NC4
--
Not used.
41
REFH
Out
Terminal for the built-in DAC
42, 43
NC5, NC6
--
Not used.
44
DAOR
Out
Right channel sound waveform output
45
NC7
--
Not used.
46
AVdac
In
+5 V source for the built-in DAC and ADC
47
DAOL
Out
Left channel sound waveform output
48
REFL
Out
Terminal for the built-in DAC and ADC
49
AGdac
In
Ground source for the built-in DAC
50
AGadc
In
Ground source for the built-in ADC
51
ANI
--
Not used. Connected to ground.
52
AVadc
In
+5 V source for the internal ADC
53
NC8
--
Not used. Connected to +5 V.
54
MOD0
In
Mode selection terminal
55, 56
MOD1, MOD2
In
Mode selection terminal
57
KO9/P40
In
APO cancelation signal input
58 ~ 65
KI0/P30 ~ KI7/P37
In
Terminals for key/button input signal
66 ~ 73
KO1/P50 ~ KO8/P57
Out
Terminals for key scan signal
74 ~ 77
P20 ~ P23
Out
Terminals for button scan signal
78
NC9
--
Not used.
79
LVCC
In
+5 V source
80 ~ 82
CC1 ~ CC3
Out
LED common signal output
83 ~ 87
--
--
Not used.
88 ~ 95
La ~ Lg, Lp
Out
LED segment signal output
96
LGND
In
Ground (0 V) source
97 ~ 100
--
--
Not used.
CPU (LSI101: MSM6755B-06)
The CPU contains a sound data ROM and a DAC (Digital to Analog Convertor), and it provides left and right
channel sound waveforms in accordance with the pressed key and the selected tone.
The following table shows the pin functions of LSI101.
FILTER BLOCK
Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.