Casio CTK-496 Manuale utente
ELECTRONIC KEYBOARD
CTK-496
JUN. 2004
CTK-496
Ver.1 : Feb. 2005
CONTENTS
Specifications ---------------------------------------------------------------------------------------------- 1
Block Diagram --------------------------------------------------------------------------------------------- 3
Circuit Description --------------------------------------------------------------------------------------- 4
Printed Circuit Board ------------------------------------------------------------------------------------ 5
Disassembly ------------------------------------------------------------------------------------------------ 6
Diagnostic Program-------------------------------------------------------------------------------------- 7
Schematic Diagrams----------------------------------------------------------------------------------- 12
Exploded View ------------------------------------------------------------------------------------------- 14
Parts List--------------------------------------------------------------------------------------------------- 15
— 1 —
SPECIFICATIONS
GENERAL
Keyboard: 61 standard-size keys, 5 octaves
Tones: 100
Polyphony: 12 notes maximum (6 for certain tones)
Auto Accompaniment
Rhythm Patterns: 100
Tempo: Variable (236 steps, = 20 to 255)
Chords: 2 fingering methods (CASIO CHORD, FINGERED)
Rhythm Controller: START/STOP, SYNCHRO/FILL-IN
Accomp Volume: 0 to 9 (10 steps)
Song Bank
Tunes: 100
Controllers: PLAY/PAUSE, STOP, REW, FF, LEFT ON/OFF (ACCOMP), RIGHT ON/OFF
(MELODY)
Display
Name display: TONE, RHYTHM, SONG BANK name/number, keyboard settings name/value
Tempo: Tempo value, metronome, synchro standby, beat indicator, volume setting
Chord: Chord name, Chord form
Fingering: Fingering indicators, parts
Song Bank Status: PLAY, PAUSE, REW, FF
Staff: 5 octaves with sharp and flat indications, pedal symbol, octave symbol
Keyboard: 5 octaves
MIDI: 5 multi-timbre receive
Other Functions
Transpose: 12 steps (–6 semitones to +5 semitones)
Tuning: Variable (A4 = approximately 440Hz ±50 cents)
Volume: 0 to 9 (10 steps)
Terminals
MIDI Terminals: IN, OUT
Sustain Terminal: Standard jack
Phones/Output Terminal: Stereo standard jack (Output is monaural.)
Output Impedance: 78Ω
Output Voltage: 4V (RMS) MAX
Power Supply Terminal: 9V DC
Microphone In: Standard jack (with microphone volume knob)
Input impedance: 40kΩ
Input sensitivity: 10mV
Power Supply: Dual power supply system
Batteries: 6 AA-size batteries
Battery Life: Approximately 4 hours continuous operation on alkaline batteries
Approximately 2 hours continuous operation on manganese batteries
AC Adaptor: AD-5
Auto Power Off: Turns power off approximately 6 minutes after last key operation. Enabled under battery
power only, can be disabled manually.
Speaker Output: 2.0W + 2.0W
Power Consumption: 9V 7.7W
Dimensions: 95.6 ×35.4 ×13.2 cm (37 11/16 ×13 15/16 ×3 3/16 inch)
Weight: Approximately 3.8kg (8.4lbs) (without batteries)
— 2 —
ELECTRICAL
Current drain with 9 V DC:
No sound output 86 mA ±20 %
Maximum volume 650 mA ±20 %
with 13 keys C1 to C2 pressed in 60 Synth-Lead 1
Volume: Maximum, Velocity: Maximum
Speaker output level (Vrms with 4 Ωload each channel):
with key C1 pressed in 60 Synth-Lead 1 1080 mV ±20 %
Phone output level (Vrms with 32 Ωload each channel):
with key F5 pressed in 60 Synth-Lead 1 295 mV ±20 %
Output level (Vrms with 47 KΩload each channel):
with key F2 pressed in 60 Synth-Lead 1 1250 mV ±20 %
— 3 —
BLOCK DIAGRAM
LCD Driver
LSI201
ST7066U-OAQ
DB4 ~ DB7
SEG1 ~ SEG40
COM1 ~ COM7
COM9 ~ COM16
E
P/W
RS
KI1 ~ KI7
KO1 ~ KO7
KOD8 ~ KOD12
KID0 ~ KID6
MPU
LSI301
ML6756B24
OP AMP
IC205
NE5532P
DAO
D/A Converter
IC402
LA4227
Keyboard
LCD
MIC
MIC
VR
Speakers
(L) (R)
MIDI
IN
OUT
Sustain Jack
Buttons
Power Switch
OP AMP
IC204NE5532P
— 4 —
CIRCUIT DESCRIPTION
KEY MATRIX
C2 C3 C4 C5 C6 C7
BUTTON MATRIX
KID5
VOLUME-
DOWN
CHORD
BOOK
RHYTHM
POWER / MODE
(NORMAL)
REW
KID6
VOLUME-
UP
ACCOMP.
VOLUME
TONE
POWER / MODE
(OFF)
–
KID3
TEMPO
DOWN
START /
STOP
TRANSPOSE/
TUNE
POWER / MODE
(FINGERD)
STOP
KID4
TEMPO UP
SYNCRO /
FILL-IN
SONG
BANK
POWER / MODE
(CASIO CHORD)
LEFT
KID1
+
2
5
8
RIGHT
KID2
0
1
4
7
PLAY/PAUSE
KOD8
KOD9
KOD10
KOD11
KOD12
KID0
-
3
6
9
FF
KI0 KI1 KI2 KI3 KI4 PI4 PI5 PI6 PI7
KO0 C2 G2# E3 C4 G4# ––––
KO1 C2# A2 F3 C4# A4 ––––
KO2 D2 A2# F3# D4 A4# ––––
KO3 D2# B2 G3 D4# B4 ––––
KO4 E2 C3 G3# E4 –––––
KO5 F2 C3# A3 F4 –––––
KO6 F2# D3 A3# F4# –––––
KO7 G2 D3# B3 G4 –––––
PO0 ––––––E5 C6 G6#
PO1 ––––––F5 C6# A6
PO2 ––––––F5# D6 A6#
PO3 ––––––G5 D6# B6
PO4 –––––C5 G5# E6 C7
PO5 –––––C5# A5 F6 –
PO6 –––––D5 A5# F6# –
PO7 –––––D5# B5 G6 –
NOMENCLATURE OF KEYS
— 5 —
PRINTED CIRCUIT BOARDS
MAIN PCB M627-MAIN1
Keyboard PCBs M627-KEY1/KEY2
MIC JACK PCB M627-MAIN2 MIC VOLUME PCB M627-MAIN3 PCB
— 6 —
DISASSEMBLY
1. Remove the battery cover and the batteries.
2. Remove the volume knob.
3. Remove 12 screws on the bottom of the product, and three lower plates.
Note: Fix the screws in the right order when assembling each lower plate.
4. Remove 35 screws on the bottom of the product.
Note: Fix the screws in the right order when assembling.
Fix a screw here first.
Fix a screw here first.
Fix a screw here first.
Fix a screw here first.
LOWER PLATE ×3
5. Remove the upper case.
— 7 —
Note: Pay attention to the position of the LED(D225) when assembling the upper case.
Note: Be careful of the height of the LED (D225) when replacing it.
17.5 ±0.5 mm SOLDER SIDE
COMPONENT SIDE
6. Remove four solders and two speakers.
7. Remove two screws and unsolder one connector (CN31), and then remove the M627-MAA2 and M627-
MAA3 PCBs.
White
Orange
Brown
Connector (CN31)
M627-MAA2 PCB
M627-MAA3 PCB
Blue
— 8 —
8. Unsolder two lead wires for the power source.
Unsolder one connector (CN1) and then remove the M627-MAA1 PCB.
Connector (CN1)
M627-MAA1 PCB
9. Remove 21 screws and the keys.
10. Remove five rubber keys on the keyboard.
Note: The length of this one rubber key is different.
Note: Push the rubber keys all the way in by tweezers when
assembling.
Make sure that they are tightly fixed.
Power Cord (Black)
Power Cord (Red)
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