Casio CTK-496 User manual

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

P/W

KI1 ~ KI7

KO1 ~ KO7

KOD8 ~ KOD12

KID0 ~ KID6

MPU

LSI301

ML6756B24

OP AMP

IC205

NE5532P

DAO

D/A Converter

IC402

LA4227

Keyboard

LCD

MIC

Speakers

(L) (R)

MIDI

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-

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

RIGHT

KID2

PLAY/PAUSE

KOD8

KOD9

KOD10

KOD11

KOD12

KID0

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.

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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