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ELECTRIONIC KEYBOARD
CTK-480
CTK-480
0
5
1
6
2
7
3
8
4
9
MULTI FUNCTION DISPLAY
POWER/MODE
FINGERED
CASIO CHORD
NORMAL
ON
OFF
VOLUME SYNCHRO/
FILL-IN
START/
STOP
TEMPO
/
¢
/
TRANSPOSE/TUNE
sAm
00 sAm
1
01 sAm
2
02 zL[gN
03 X^WIsAm
04 GNgbNsAm
1
05 GNgbNsAm
2
06 GNgbNsAm
3
07 GNgbNsAm
4
08 n[vVR[h
09 NuGNg
IK
10 GNgbNIK
1
11 GNgbNIK
2
12 GNgbNIK
3
13 GNgbNIK
4
14 `[`IK
15 pCvIK
16 [hIK
17 AR[fBI
18 ohlI
19 n[jJ
M^[
/x[X
20 KbgM^[
21 AR[XeBbNM^[
22 WYM^[
23 GNgbNM^[
24 ~[gM^[
25 fBXg[VM^[
26 Ebhx[X
27 GNgbNx[X
28 Xbvx[X
29 oW[
XgOX
/ATu
30 oCI
31 `F
32 n[v
33 XgOX
1
34 XgOX
2
35 XgOX
3
36 VZXgOX
1
37 VZXgOX
2
38 NCA
39 {CX
uX
40 gybg
41 `[o
42 uXZNV
43 t`z
1
44 t`z
2
45 uX
1
46 uX
2
47 VZuX
1
48 VZuX
2
49 VZuX
3
[h
/pCv
50 \vmTbNX
51 AgTbNX
52 ei[TbNX
53 I[{G
54 Nlbg
55 sbR
56 t[g
57 R[_[
58 t[gATu
59 zCbX
VZTEh
1
60 VZ[h
1
61 VZ[h
2
62 VZ[h
3
63 VZJIy
64 VZpbh
1
65 VZpbh
2
66 VZpbh
3
67 OXn[jJ
69 VZx[X
VZTEh
2
70 p[hbv
71 RY~bNTEh
72 TEhgbN
73 Xy[Xpbh
74 VZ
SFX
75 l°,,
1 (L¤
)
76 l°,,
2 (db
)
77 l°,,
3 (F
)
78 l°,,
4 (Cx[_[
)
79 l°,,
)
C[
80 XgOXsAm
81 XgOXGs
82 NCAGs
83 NCAIK
84 XgOXM^[
85 XgOXn[v
86 uXXgOX
87 oCupbh
88 12·M^[
89 NCAXgOX
Xvbg
90 x[X
/sAm
91 x[X
/Gs
92 x[X
/oCu
93 x[X
/KbgM^[
94 x[X
/fBXg[VM^[
95 XgOX
/sAm
96 XgOX
/gybg
97 rutH
98 }o
99 p[JbV
100 TONES
¢
TONE RHYTHM
SONG
TONE
RHYTHM
|bvX
00 |bvt[W
01 o[h
02 |bvo[h
03 bv|bv
04 \Eo[h
06 16r[g
07 8r[g
1
08 8r[g
2
09 |bvX
bN
10 bNc
11 X[bN
12 \tgbN
1
13 \tgbN
2
14 tH[L[|bv
15 60's \E
16 bN
17 wr[^
18 50's bN
19 VJSu[X
WY
/_X
20 rbNoh
21 X[XCO
22 tHbNXgbg
23 WYc
24 AVbhWY
25 et[W
26 gX
27 fBXR
28 bv
[sA
/e
30 |J
31 }[`
1
2
34 ^S
35 {Tmo
36 To
37 }{
38 o
39 ```
»...
40 Q
41 QG
42 XJ
43 ebNXbNX
44 tHN[
45 Jg[
46 SXy
47 A_j
48 obN
49
01 ««fl
02 '¢¢I[KX`
03 ACWOEOCX
04
05 h·
06 hf[
07 O[X[uX
08 Øi
00 AClENClEingEW[N
11
12
13
AvXOE
14
T^E`A
15
,,si
16 twlGxL
17
10 WOx
si¨w>ØLl`x
20 SONG BANK
50 RHYTHMS
09 º­...L~
18
19
AnEIG
G^[eBi[
F<æ
MELODY
ON/OFF


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-- 2 --
CONTENTS
Specifications .......................................................................................................................... 2
Block Diagram ......................................................................................................................... 3
Circuit Description ................................................................................................................... 4
Troubleshooting ...................................................................................................................... 7
Major Waveforms .................................................................................................................... 8
Schematic Diagrams ............................................................................................................... 9
Printed Circuit Boards ........................................................................................................... 11
Exploded View ...................................................................................................................... 13
Parts List ............................................................................................................................... 15
SPECIFICATIONS
GENERAL
Number of keys:
61
Polyphonic:
12-note
Preset tones:
100
Auto-rhythms:
50, Tempo control: 40 to 255
Accompaniment:
CONCERT Chord, Fingered
Song bank:
20-tune
Tuning control:
440 Hz
± 50 cents
Built-in speakers:
4 inch dia. 1 W input rating: 2 pcs
Terminals:
Headphone Jack (Output impedance: 50 ohm, Output voltage: 4.6 V (rms) MAX
Power source:
2-way AC or DC source
AC: AC adapter
DC: 6D size dry batteries, Vehicle battery with DC adapter
Power consumption:
7.7 W
Dimensions(HWD):
90
× 910 × 322 mm (3-1/2 × 36-3/16 × 12-11/16 inches)
Weight:
3.9 kg (8 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-06
LSI101
Keyboard
Buttons
LED
Reset IC
IC102
Oscillator
X101, Q111
Q105
Power Supply Circuit
Q101 ~ Q104, D108, D109
Power Amp.
LA4598
IC101
Filter (L)
Q109
Filter (R)
Q110
Output
DC+9V IN
VC
VCC AVDD DVDD LVDD
APO
CC1 ~ CC3
La ~ Lg,
Lp
KO8 ~
KO11
KI0 ~ KI7
KO0 ~ KO7
BLOCK DIAGRAM


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-- 4 --
CIRCUIT DESCRIPTION
KEY MATRIX
KI0
KI1
KI2
KI3
KI4
KI5
KI6
KI7
KO0
C1
G#1
E2
C3
G#3
E4
C5
G#5
KO1
C#1
A1
F2
C#3
A3
F4
C#5
A5
KO2
D1
A#1
F#2
D3
A#3
F#4
D5
A#5
KO3
D#1
B1
G2
D#3
B3
G4
D#5
B5
KO4
E1
C2
G#2
E3
C4
G#4
E5
C6
KO5
F1
C#2
A2
F3
C#4
A4
F5
KO6
F#1
D2
A#2
F#3
D4
A#4
F#5
KO7
G1
D#2
B2
G3
D#4
B4
G5
KO8
0
1
2
3
4
Start/Stop
Tempo
Up
Volume
Up
KO9
56
78
9
Tempo
Down
Volume
Down
Synchro/
Fill-In
K10
Tone
Rhythm
Song
Bank
Melody
On/Off
K11
Fingered
CONCERT
Chord
Normal
Power Off
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
D#3
C2
D2
E2
F2
G2
A2
B2
C3
D3
E3
B6
A6
G6
F6
E6
D6
C7
C#3
A#2
G#2
F#2
D#2
C#2
A#6
G#6
F#6
D#6
C#6


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-- 5 --
+
+
AVDD
AG
AG
AG
AG
AG
16 V 10 µ
2SC1740SQ
10 K
10
10 K
10 K
C332(H)
33
K
C152
(H)
C221B
(A)
10
V
22
µ
2.2
K
To main volume
From the CPU
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.
Pin No.
Terminal
In/Out
Function
1 ~ 29
MA14 ~ NC2
--
Not used.
30
DGND
In
Ground (0V) source
31
DVCC
In
+5V source
32, 33
XTLO, XTLI
In/Out
20MHz clock input/output
34
NC3
--
Not used. Connected to ground.
35
RSTB
In
Reset signal input
36
P24/RXD
--
Not used. Connected to +5V.
37
P25/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 internal DAC
42, 43
NC5, NC6
--
Not used.
44
DAOR
Out
Right channel sound waveform output
45
NC7
--
Not used.
46
AVdac
In
+5V source for the internal DAC and ADC
47
DAOL
Out
Left channel sound waveform output
48
REFL
Out
Terminal for the internal DAC and ADC
49
AGdac
In
Ground source for the internal DAC
50
AGadc
In
Ground source for the internal ADC
51
ANI
--
Not used. Connected to ground.
52
AVadc
In
+5V source for the internal ADC
53
NC8
--
Not used. Connected to +5V.
54
MOD0
In
Mode selection terminal
55, 56
MOD1, MOD2
In
Mode selection terminal
57
KO9/P40
In
Power source detection 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 input signal
78
NC9
--
Not used.
79
LVCC
In
+5V source
80 ~ 82
CC1 ~ CC3
Out
LED common signal output
83 ~ 87
--
--
Not used.
88 ~ 95
La ~ Lg, Lp
Out
Not used.
96
LGND
In
Ground (0V) source
97 ~ 100
--
--
Not used.
FILTER BLOCK
Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.