(with price)
CTK-450
ELECTRONIC KEYBOARD
R
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
-- 1 --
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
, 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 K
load each cannel):
650 mV
± 20%
with key C6 pressed in Clarinet tone
Phone Output Level (Vrms with 8
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
SPECIFICATIONS
-- 2 --
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
--
3
--
KO0~KO14
KI0~KI7
Keyboard
Switches
Oscillator
Power Supply Circuit
AVDD +5V
VCC +9V
Speaker
Output Jack
Filter
T4/T5
CPU
MSM6567-15
T1/T2/T3
Amplifier
LA4598
Main Volume
Mute Circuit
Reset IC
VDD +5V
M5218APR
T6
S-8053ANO
LEDX6
(APO)
BLOCK DIAGRAM