casio_ctk-480.pdf

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CTK-480

50 RHYTHMS

100 TONES
sAm
sAm
1
sAm
2
zL[gN
X^WIsAm
GNgbNsAm
00
01
02
03
04
05
06
07
08
09

GNgbNsAm
GNgbNsAm
GNgbNsAm

IK

1

2
3
4

n[vVR[h
NuGNg

M^[

10 GNgbNIK
11 GNgbNIK
12 GNgbNIK
13 GNgbNIK
14 '['IK
15 pCvIK
16 [hIK
17 AR[fBI
18 ohlI
19 n[jJ

/x[X

1 20 KbgM^[
2 21 AR[XeBbNM^[
3 22 WYM^[
4 23 GNgbNM^[
24 ~[gM^[
25 fBXg[VM^[
26 Ebhx[X
27 GNgbNx[X
28 Xbvx[X
29 oW[

XgOX
30 oCI
31 'F
32 n[v
33 XgOX
34 XgOX
35 XgOX
36 VZXgOX
37 VZXgOX
38 NCA
39 {CX

/ATu

uX

[h

40 gybg
41 '[o
42 uXZNV
43 t'z
44 t'z
45 uX
1
1 46 uX
2
2 47 VZuX
48 VZuX
49 VZuX

1
2
3

1
2
1
2
3

POWER/MODE
VZTEh
2
p[hbv
RY~bNTEh
TEhgbN
Xy[Xpbh
VZ
SFX
ł?,,
1 (Ł¤
)
ł?,,
2 (db )
ł?,,
3 (F
)
ł?,,
4 (Cx[_[
)
ł?,,
5 (t@j[
)
70
71
72
73
74
75
76
77
78
79

C[
80
81
82
83
84
85
86
87
88
89

XgOXsAm
XgOXGs
NCAGs
NCAIK
XgOXM^[
XgOXn[v
uXXgOX
oCupbh
12oM^[
NCAXgOX

Xvbg
x[X /sAm
x[X /Gs
x[X /oCu
x[X /KbgM^[
x[X /fBXg[VM^[
XgOX
/sAm
XgOX
/gybg
rutH
}o
p[JbV
90
91
92
93
94
95
96
97
98
99

ON

50
51
52
53
54
55
56
57
58
59

/pCv
\vmTbNX
AgTbNX
ei[TbNX
I[{G
Nlbg
sbR
t[g
R[_[
t[gATu
zCbX

VOLUME SYNCHRO/
?
FILL-IN

1

VZTEh
VZ[h
VZ[h
VZ[h
VZJIy
VZpbh
VZpbh
VZpbh
OXn[jJ
Jg[t@[
VZx[X
60
61
62
63
64
65
66
67
68
69

START/
STOP

1
2
3
1
2
3

MULTI FUNCTION DISPLAY

TEMPO

TONE RHYTHM

/

/
TRANSPOSE/TUNE

bN
10
11
12
13
14
15
16
17
18
19

WY

bNc
X[bN
\tgbN
\tgbN
tH[L[|bv
60's \E
bN
wr[^
50's bN
VJSu[X

20
21
1 22
2 23
24
25
26
27
28
29

/_X
rbNoh
X[XCO
tHbNXgbg
WYc
AVbhWY
et[W
gX
fBXR
bv
t@N

0

?

FINGERED
CASIO CHORD
NORMAL

OFF

|bvX
|bvt[W
o[h
|bvo[h
bv|bv
\Eo[h
t@L[|bv
16r[g
8r[g
1
8r[g
2
|bvX
00
01
02
03
04
05
06
07
08
09

1

2

3

4

6

7

8

9

/e

1
2

>>...
40
41
42
43
44
45
46
47
48
49

Q
QG
XJ
ebNXbNX
tHN[
Jg[
SXy
A_j
obN

00
01
02
03
04
05
06
07
08
09

AClENClEingEW[N
<<<<fl
'??I[KX'
ACWOEOCX

h?
hf[
O[X[uX
???
?˘-...Ł~

10
11
12
13
14
15
16
17
18
19

WOx
AvXOE
T^E'A
,,si
AnEIG
twlGxŁ
F<ae
si¨w>?Łl'x
G^[eBi[

TONE

5

20 SONG BANK
[sA
|J
}['
c@
c@
^S
{Tmo
To
}{
o
'''
30
31
32
33
34
35
36
37
38
39

RHYTHM

SONG

MELODY
ON/OFF

CTK-480

ELECTRIONIC KEYBOARD

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:
Polyphonic:
Preset tones:
Auto-rhythms:
Accompaniment:
Song bank:
Tuning control:
Built-in speakers:
Terminals:
Power source:

Power consumption:
Dimensions(HWD):
Weight:

61
12-note
100
50, Tempo control: 40 to 255
CONCERT Chord, Fingered
20-tune
440 Hz ? 50 cents
4 inch dia. 1 W input rating: 2 pcs
Headphone Jack (Output impedance: 50 ohm, Output voltage: 4.6 V (rms) MAX
2-way AC or DC source
AC: AC adapter
DC: 6D size dry batteries, Vehicle battery with DC adapter
7.7 W
90 × 910 × 322 mm (3-1/2 × 36-3/16 × 12-11/16 inches)
3.9 kg (8 lbs) excluding batteries

ELECTRICAL
Current drain with 9 V DC:
No sound output
Maximum volume
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
Sound Pressure (at 10 cm away from speaker):
with key E3 pressed in Synth-Lead 1
Minimum operating voltage:

--2--

120 mA ? 30%
650 mA ? 30%

80 mV ? 30%
100 dB ? 10 dB
6.0 V

BLOCK DIAGRAM

Buttons

LED
La ~ Lg,
Lp

Output

--3--

Power Amp.
LA4598
IC101

VC

KO8 ~
KO11

CC1 ~ CC3

Filter (L)
Q109
Filter (R)
Q110

VCC AVDD DVDD LVDD
APO

Keyboard
CPU
MSM 6755B-06
LSI101

Power Supply Circuit
Q101 ~ Q104, D108, D109

DC+9V IN

KI0 ~ KI7

KO0 ~ KO7

Q105
Reset IC
IC102

Oscillator
X101, Q111

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

5

6

7

8

9

Tempo
Down

Volume
Down

Synchro/
Fill-In

K10

Tone

Rhythm

Song
Bank

Melody
On/Off
Fingered

CONCERT
Chord

Normal

Power Off

K11

NOMENCLATURE OF KEYS
C#2 D#2

C2

D2

E2

F#2 G#2 A#2

F2

G2

A2

B2

C#3 D#3

C3

D3

E3

F#3 G#3 A#3

F3

G3

A3

B3

C#4 D#4

C4

D4

E4

F#4 G#4 A#4

F4

G4

--4--

A4

B4

C#5 D#5

C5

D5

E5

F#5 G#5 A#5

F5

G5

A5

B5

C#6 D#6

C6

D6

E6

F#6 G#6 A#6

F6

G6

A6

B6 C7

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.
1 ~ 29
30
31
32, 33
34
35
36
37
38
39
40
41
42, 43
44
45
46
47
48
49
50
51
52
53
54
55, 56
57
58 ~ 65
66 ~ 73
74 ~ 77
78
79
80 ~ 82
83 ~ 87
88 ~ 95
96
97 ~ 100

Terminal
MA14 ~ NC2
DGND
DVCC
XTLO, XTLI
NC3
RSTB
P24/RXD
P25/TXD
NMI
APO
NC4
REFH
NC5, NC6
DAOR
NC7
AVdac
DAOL
REFL
AGdac
AGadc
ANI
AVadc
NC8
MOD0
MOD1, MOD2
KO9/P40
KI0/P30 ~ KI7/P37
KO1/P50 ~ KO8/P57
P20 ~ P23
NC9
LVCC
CC1 ~ CC3
--
La ~ Lg, Lp
LGND
--

In/Out
--
In
In
In/Out
--
In
--
--
In
Out
--
Out
--
Out
--
In
Out
Out
In
In
--
In
--
In
In
In
In
Out
Out
--
In
Out
--
Out
In
--

Function
Not used.
Ground (0V) source
+5V source
20MHz clock input/output
Not used. Connected to ground.
Reset signal input
Not used. Connected to +5V.
Not used.
Power on signal input
APO (Auto Power Off) signal output
Not used.
Terminal for the internal DAC
Not used.
Right channel sound waveform output
Not used.
+5V source for the internal DAC and ADC
Left channel sound waveform output
Terminal for the internal DAC and ADC
Ground source for the internal DAC
Ground source for the internal ADC
Not used. Connected to ground.
+5V source for the internal ADC
Not used. Connected to +5V.
Mode selection terminal
Mode selection terminal
Power source detection signal input
Terminals for key/button input signal
Terminals for key scan signal
Terminals for button input signal
Not used.
+5V source
LED common signal output
Not used.
Not used.
Ground (0V) source
Not used.

FILTER BLOCK
Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.
10

10 V 22 u

AVDD

+

AG
2SC1740SQ
10 K

16 V 10 u

10 K

From the CPU

AG

AG

--5--

33 K

C152 (H)

2.2 K
AG

C221B (A)

C332(H)

+

To main volume

10 K

AG

POWER AMPLIFIER (IC101: LA4598)
The power amplifier is a two-channel amplifier with standby switch.
The following table shows the pin function of IC101.
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14

Terminal
Power GND
Ch1 B.S.
Ch1 OUT
VCC
Ch1 N.F.
Ch1 IN
D.C.
Pre GND
Stand by
Ch2 IN
Ch2 N.F.
Ch2 OUT
Ch2 B.S.
NC

In/Out
In
--
Out
In
In
In
--
In
In
In
In
Out
--
--

Function
Ground (0V) source
Terminal for a bootstrap capacitor
Channel 1 output
+9V source
Negative feedback input
Channel 1 input
Terminal for a decoupling capacitor
Ground (0V) source
Power control signal input. 0 V: Off, +9 V: On
Channel 2 input
Negative feedback input
Channel 2 output
Terminal for a bootstrap capacitor
Not used

LED DRIVING

La~Lg, Lp
LVDD

CPU
LSI01
MSM6755B
LG

CC1~CC3
Q106~Q108
LED Driver

--6--

INITIAL RESET CIRCUIT
When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU.
The CPU then initializes its internal circuit.
Battery Set
VDD
Reset IC
RE5VA35A
IC102

RESET

CPU
MSM 6755B-06
LSI101

TROUBLESHOOTING
Nature of Trouble
No power

Faulty Block
Power supply circuit

Cause/Remedy
Faulty IC101. Replace IC101.
Faulty D106 ~ D109. Replace D106 ~
D109.
Faulty Q101 ~ Q104. Replace Q101 ~
Q104.

Power switch
Power jack (J101)

Open J101 or poor soldering. Replace
J101 or resolder.

Power Amp (IC101: LA4596)

Open or shorted IC101. Replace IC101.

CPU (LSI101: MSM6755B-06)

Faulty LSI101. Replace LSI101.

Oscillator

No sound at all

Poor contact. Clean the contacts.

Faulty Q111. Replace Q111.
Open X101. Replace X101.

Certain keys or switches
do not function

CPU (LSI101: MSM6755B-06)
A certain key or switch
does not function

Key and switch matrix

Open circuit on KO or KI line.
Replace keyboard PCB assembly.
Faulty LSI101. Replace LSI101.

Key and switch matrix

Dust on the contact.

--7--

MAJOR WAVEFORMS
20 us

0.1 s

CH1
CH1

1

2

CH1

CH1

BWL

5V

1 RESET signal
IC102 pin 1

1V

BWL

2 Main clock pulse
MSM6755B-06 pin 32

1ms

10 us

5

CH1

6

CH2

CH1

3
4

CH2

CH1

5V

CH2

BWL

5V

CH1

3 Key scan signal KO10
MSM6755B-06 pin 76
4 Key scan signal KO11
MSM6755B-06 pin 77

1V

CH2

1V

BWL

5 Sound signal output (L-ch)
MSM6755B-06 pin 47
6 Sound signal output (L-ch)
Q109 2SC1740SQ Emitter
1ms

1ms

CH1

7

CH1

8

CH2

CH1 1V

CH2 1V

7 Sound signal output (R-ch)
MSM6755B-06 pin 45
8 Sound signal output (R-ch)
Q110 2SC1740SQ Emitter

9

CH2

0

CH1

BWL

1V

CH2

1V

9 Sound signal output (R-ch)
LA4598 pin 3
0 Sound signal output (L-ch)
LA4598 pin 12
Tone: Flute Ensemble (58)
Key: A3
Volume: 7
--8--

BWL

SCHEMATIC DIAGRAMS
Main PCB KDM440-MA1M

Notes:
1. All capacitance values are indicated in &quot; uF &quot; (p=10-6 uF)
2. All resistance values are indicated in &quot; Ohm &quot; (k=103 Ohm, M=106 Ohm).

7

1

5
2

10
6
9

8

3

4

--9--

Keyboard PCBs KDM6111K-KY1M/KY2M

Notes:
1. All capacitance values are indicated in &quot; uF &quot; (p=10-6 uF)
2. All resistance values are indicated in &quot; Ohm &quot; (k=103 Ohm, M=106 Ohm).
-- 10 --

PRINTED CIRCUIT BOARDS
Main PCB KDM440-MA1M

4

3

2

1

7

5

Top View

Console PCB KDM6111K-KY1M

Top View

Console PCB KDM6111K-KY2M

Top View

-- 11 --

6

8

10

9

Main PCB KDM440-MA1M

Bottom View

Console PCB KDM6111K-KY1M

Bottom View

Console PCB KDM6111K-KY2M

Bottom View

-- 12 --

EXPLODED VIEW

9

8
10

11

R-1
7
R-2

6

R-3

4
3
5

2
1

4

12
15

16

13
R-4

15
R-5

16

-- 13 --

14

PARTS LIST
CTK-480

Notes:

This parts list does not include the cosmetic parts, which
parts are marked with item No. &quot; R-X &quot; in the exploded
view.
Contact our spare parts department if you need these
parts for refurbish.
1.

Prices and specifications are subject to change without prior notice.

2.

As for spare parts order and supply, refer to the
&quot; GUIDEBOOK for Spare parts Supply &quot; , published
seperately.

3.

The numbers in item column correspond to the same
numbers in drawing.

N

Item

Code No.

Q

FOB Japan
N.R.Yen
R
Unit Price

LA4598
RE5VL40AA-TZ
MSM6755B-06
2SB1237Q
2SC1740Q
2SD1858Q
2SA933SQ
2SC1740Q
MTZJ5.1A
RB441Q-40T
RB441Q-40T
1FW143N
RB441Q-40T
MTZJ5.6BT
MTZJ5.6BT
RB441Q-40T
RB441Q-40T
MPR3338S-B99
LB603VF1
EFO-EN2005C4
HEC2305-01-330
YKB21-5006

1
1
1
1
1
2
1
6
1
1
1
1
1
1
1
20
1
1
1
1
1
1

A
A
A
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
A
C

1SS2473
1SS2473

25
36

B
B

1
1
1
2
1
1
1
4
1
1
2
1
1
1
2
2

B
B
B
B
B
B
B
A
A
A
A
B
B
B
B
B

Parts Name

MAIN PCB ASSEMBLY
2114 2891 Monolithic IC
2105 5922 IC
2012 3486 LSI, CPU
2251 0469 Transistor
2220 1387 Transistor
2253 0448 Transistor
2200 2449 Transistor
2220 1387 Transistor
2360 1729 Zener diode
2390 2828 Diode
2390 2828 Diode
2390 2408 Zener diode
2390 2828 Diode
2360 2002 Zener diode
2360 2002 Zener diode
2390 2828 Diode
2390 2828 Diode
2370 1106 LED
2370 1309 LED
2590 1526 Ceramic oscillator
3501 7046 Power jack
3612 0665 Phones jack
CONSOLE PCB ASSEMBLY
D701 - 725
2301 0101 Diode
D731 - 766
2301 0101 Diode
MECHANICAL PARTS
1
6909 5890 Slide contact
2
6925 1560 Key contact rubber, 6-contact
3
6925 1630 Key contact rubber, 14-contact
4
3831 0770 Speaker
5
6925 1260 PCB ass'y, MA1M 6925 1260
6
6925 1890 Battery cover
7
6921 5030 Slide knob
8
6922 2720 White key set, 7-Key
9
6922 2730 White key set, 8-Key
10
6922 2750 Black key set, 5-Key
11
6922 2740 Black key set, 10-Key
12
6922 4000 Key contact rubber, 31-contact
13
6922 3990 Key contact rubber, 30-contact
14
6925 1310 PCB ass'y, KY
15
6925 1600 Plastic foot
16
6925 1620 Rubber foot

IC101
IC102
LSI101
Q101
Q102
Q103/104
Q105
Q106 - 111
D101
D103
D105
D106
D107
D108
D109
D110 - 129
D130
LED101
LED102
X101
J101
J102

-- 15 --

Specification

CSB-12D
M340418-1
M340417-1
S10JA13A
M140403*1
M340485*1
M311859-1
M312118*1
M312118*2
M111726-2
M111726-1
M111765-1
M111764-1
M140402*1
M440346-1
M440366-1

MA0600761A


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