CASIO CTK501 - Service Manual Immediate Download

ELECTRONIC KEYBOARD

CTK-501

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100 SONG BANNK

100 TONES

100 RHYTHMS

POWER/MODE

MAIN VOLUME

TEMPO

MUSICAL INFORMATION SYSTEM

TONE

RHYTHM

SONG BANK

STATUS

TEMPO

MAIN VOLUME

FINGERING/PART

LEFT/

ACCOMP

RIGHT/

MELODY

:1 OCTAVE UP

:PEDAL(SUSTAIN)

100 SONG BANNK KEYBOARD

MUSICAL INFORMATION SYSTEM

ON

OFF

FINGERED

SYNCHRO/

FILL-IN

CHORD BOOK

TONE

Mm

M7

dim

aug

7

sus4

-5

add9

CLEAR

0

123

456

789

RHYTHM

STOP

REW

LEFT

RIGHT

ON/OFF

PLAY/

PAUSE

FF

SONG BANK

TRANSPOSE/

TUNE/MIDI

ACCOMP

VOLUME

START/

STOP

CASIO CHORD

NORMAL

SONG BANK CONTROLLER

CONTENTS

Specifications ................................................................................................................................... 1

Block Diagram .................................................................................................................................. 2

Circuit Description ............................................................................................................................ 3

Adjustment ....................................................................................................................................... 7

Major Waveforms ............................................................................................................................. 8

Printed Circuit Boards ...................................................................................................................... 9

Schematic Diagrams ...................................................................................................................... 11

Exploded View ............................................................................................................................... 16

Parts List ........................................................................................................................................ 17

-- 1 --

ELECTRICAL

Current drain with 9 V DC:

No sound output

120 mA

± 20%

Maximum volume

750 mA

± 20%

with 12 keys C1 to B1 pressed in Synth-Lead 1

Volume: Maximum

Phone output level (Vrms with 8

load each channel):

with key G2 pressed in Synth-Lead 1

78 mV

± 20%

Speaker output level (Vrms with 4

load each channel):

with key G1 pressed in Synth-Lead 1

1250 mV

± 20%

Minimum operating voltage:

6.0 V

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), RIGHT (ON/OFF)

Musical information

Name display:

TONE, RHYTHM, SONG BANK name/number

Tempo:

Tempo value, metronome, synchro standby, beat indicator

Chord:

Chord name, Chord form

Fingering:

Fingering indcators, parts, pedal

Song bank status:

PLAY, PAUSE, REW, FF

Staff:

5 octaves with sharp and flat indications

Keyboard:

5 octaves

MIDI:

5 multi-timbre receive

Other functions

Transpose:

12 steps (6 semitones to +5 semitones)

Tuning:

Variable (A4 = approximately 440 Hz

± 50 cents)

Volume:

0 to 9 (10 steps)

Terminals

MIDI terminals:

IN, OUT

Sustain terminal:

Standard jack

Phones/Output terminal:

Stereo standard jack

Output Impedance: 78

Output Voltage: 4 V (RMS) MAX

Power supply terminal:

9 V DC

Power supply

Dual power supply system

Batteries:

Six D-size batteries

Battery life:

Approximately 10 hours on manganese batteries

AC adaptor:

AD-5

Auto power off:

Turns power off approximately six minutes after last key operation. Enabled

under battery power only, can be disabled manually.

Speaker output:

2.0 W + 2.0 W

Power consumption:

9 V --- 7.7 W

Dimensions (HWD):

961

× 381 × 139 mm (37-7/8 × 15-1/16 × 5-1/2 inches)

Weight:

Approximately 5.4 kg (11.91 lbs) (without batteries)

--

2

--

BLOCK DIAGRAM

CPU

MSM 6755B-17

LSI2

Keyboard

Buttons

LCD

LCD Driver

SED1278F0A

LSI3

Reset IC

IC1

Oscillator

X1, Q1

Power Supply Circuit

Q201 ~ Q203, Q208, D205

Power Amp.

TA8248K

IC201

Filter (L)

Q206

Filter (R)

Q205

Output

VC

VCC DVDD

APO

DC + 9V IN

DB4 ~ DB7

MIDI IN

MIDI OUT

COM1 ~ COM16

SEG1 ~ SEG40

RS

R/W

E

KO8 ~

KO12

KI0 ~ KI6

KO0 ~ KO7

MD0 ~ MD7

MA0 ~ MA18

ROM(2M-bit)

LC372100PM-

G48

LSI1

-- 3 --

CIRCUIT DESCRIPTION

KEY MATRIX

F#3 G#3 A#3

C#4 D#4

F#4 G#4 A#4

C#5 D#5

F#5 G#5 A#5

F3

G3

A3

B3

C4

D4

E4

F4

G4

A4

B4

C5

D5

E5

F5

G5

A5

B5

C6

D#3

C2

D2

E2

F2

G2

A2

B2

C3

D3

E3

B6

A6

G6

F6

E6

D6

C7

C#3

A#2

G#2

F#2

D#2

C#2

A#6

G#6

F#6

D#6

C#6

NOMENCLATURE OF KEYS

KI0

KI1

KI2

KI3

KI4

KI5

KI6

KI7

KO0

C2

G#2

E3

C4

G#4

E5

C6

G#6

KO1

C#2

A2

F3

C#4

A4

F5

C#6

A6

KO2

D2

A#2

F#3

D4

A#4

F#5

D6

A#6

KO3

D#2

B2

G3

D#4

B4

G5

D#6

B6

KO4

E2

C3

G#3

E4

C5

G#5

E6

C7

KO5

F2

C#3

A3

F4

C#5

A5

F6

KO6

F#2

D3

A#3

F#4

D5

A#5

F#6

KO7

G2

D#3

B3

G4

D#5

B5

G6

KO8

--+

0

KO9

32

1

KO10

6

5

4

Rhythm

Tone

KO11

9

8

7

Fingered

Normal

Off

KO12

FF

Right

Stop

Left

REW

Tempo

Down

Tempo

Up

Start/

Stop

Synchro/

Fill-In

Chord

Book

Accomp

Volume

Transpose/

Tune/MIDI

Song

Bank

CASIO

Chord

Play/

Pause

Volume

Down

Volume

Up