Casio CTK-450 User Manual
R
CTK-450
(with price)
ELECTRONIC KEYBOARD
CTK-450
CONTENTS
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DISASSEMBLE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
CIRCUIT DESCRIPTION
Key and Switch Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CPU (MSM6567-15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Filter Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mute Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Power Amplifier (LA4598) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Power Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
PCB VIEW AND MAJOR WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . 10
EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
IC AND TRANSISTOR LEAD IDENTIFICATIONS . . . . . . . . . . . . . . . . 13
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SPECIFICATIONS
General
Number of Keys: 61
Polyphonic: 16-note
Preset Tones: 64
Auto-Rhythms: 64
Auto-Accompaniment: CASIO Chord/Fingered
Auto-Play Tunes: Songs: 32 (Melody ON/OFF)
Free Sessions: 32
Terminals: PHONE/OUTPUT Jack [Output Impedance: 40 Ω, Output Voltage:
3.5V(rms)MAX], AC Adaptor Jack (DC9V)
Built-In Speakers: 10 cm dia. 1.5W Input Rating: 1 pec.
Power Source: 3-way AC or DC source
AC: AC adaptor AD-5
DC: 6 D size dry batteries
Battery life: Approx. 2 hours (SUM-3/R6P)
Approx. 4 hpurs (AM-3/LR6)
Car battery: Required optional car adaptor CA-5
Auto Power Off: Approx. 6 minutes after the last operation
Power Consumption: 7.0 W
Dimentions: 86 x 920 x 291 mm (HWD)
(3-3/8 x 36-1/4 x 11-7/16 inches) (HWD)
Weight: 3.5 kg (7.7 lbs) excluding batteries
Standard Accessory: Music stand, Song book
Electrical
Current Drain with 9V DC:
No Sound Output 130 mA ± 20%
Maximum Volume 400 mA ± 20%
with keys C3 to C4 pressed in Clarinet tone,
Volume; Maximum
Line Output Level (Vrms with 47 KΩ load each cannel): 650 mV ± 20%
with key C6 pressed in Clarinet tone
Phone Output Level (Vrms with 8 Ω load each channel): 120 mV ± 20%
with key C6 pressed in Clarinet tone
Speaker Input Level: 1400 mV ± 20%
with key C6 pressed in Clarinet tone
Minimum Operating Voltage: 5.7 V
— 1 —
DISASSEMBLE INSTRUCTIONS
Note: The keyboard PCBs are fixed to the case by springy clicks instead of by screws.
To disassemble keyboard PCBs
1. Using gentle force, press a click to release the PCB from the click.
A click can be caught in the slit behind of it, or can be deformed if too much force is used.
When a click is caught in the slit, return it to original position with a tweezers.
2. Release the clicks one by one from an end to another along the PCBs.
3. Take off the PCBs.
To reassemble the keyboard PCBs
1. Before assembling the PCBs, check that all clicks are free, and properly aligned.
2. Set the PCBs in the bumps opposite to the clicks.
3. Press down the PCBs until clicking.
When clicks are deformed, screw the PCBs on the case.
The screw is available from our spare parts center.
Code No. 0009 2682 Screw 2.6 x 8
— 2 —
Output Jack
BLOCK DIAGRAM
Reset IC
S-8053ANO
KO0~KO14
— 3 —
Speaker
VCC +9V
Amplifier
LA4598
AVDD +5V
Power Supply Circuit
T1/T2/T3
VDD +5V
Main Volume
T6
(APO)
Mute Circuit
M5218APR
Filter
T4/T5
LEDX6
CPU
MSM6567-15
Oscillator
KI0~KI7
Keyboard
Switches
Key and Switch Matrix
0IK1IK2IK3IK4IK5IK6IK7IK
CIRCUIT DESCRIPTION
0OK
rewoP
FFO
2C2#C2D2#D2E2F
1OK yalP2#F2G2#G2A2#A2B
2OK deregniF3C3#C3D3#D3E3F
3OK
OISAC
drohC
3#F3G3#G3A3#A3B
4OK gnoS4C4#C4D4#D4E4F
5OK 4#F4G4#G4A4#A4B
6OK 5C5#C5D5#D5E5F
7OK 5#F5G5#G5A5#A5B
8OK 6C6#C6D6#D6E6F
9OK 6#F6G6#G6A6#A6B
01OK 7C43210
11OK
21OK
opmeT
nwoD
opmeT
pU
31OK
41OK
Nomenclature of Keys
C#2
C2 D2E2F2G2A2 B2 C3 D3
F#2D#2
C#3A#2G#2
.pmoccA
1emuloV
765
).niM(
.pmoccA
2emuloV
.pmoccA
3emuloV
enoTmhtyhR
.pmoccA
4emuloV
)xaM(
F#3 G#3
D#3
E3
F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5
A#3 C#4 D#4
F#4 G#4
A#4
C#5
D#5
ydoleM
FFO/NO
F#5 G#5
A#5
/tratS
potS
C#6
C6
/cnyS
ni-lliF
G#6F#6D#6
A#6
B6A6G6F6E6D6
C7
— 4 —
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