Casio Ctk-800 Troubleshooting guide

ELECTRONIC KEYBOARD

(without price)

CTK-800

JUN. 2005

CTK-800

Ver.1 : Dec. 2009

INDEX

CONTENTS

Specifications ---------------------------------------------------------------------------------------------- 1

Block Diagram --------------------------------------------------------------------------------------------- 3

Circuit Description --------------------------------------------------------------------------------------- 4

Printed Circuit Board ------------------------------------------------------------------------------------ 5

Disassembly ------------------------------------------------------------------------------------------------ 7

Diagnostic Program------------------------------------------------------------------------------------ 12

Exploded View ------------------------------------------------------------------------------------------- 15

Parts List--------------------------------------------------------------------------------------------------- 16

Schematic Diagrams----------------------------------------------------------------------------------- 19

— 1 —

SPECIFICATIONS

GENERAL

Keyboard: 61 standard-size keys, 5 octaves (with touch response on/off)

Tones: 500 (362 panel tones + 128 General MIDI tones + 10 drum sets); with layer and split

Polyphony: 32 notes maximum (16 for certain tones)

Auto Accompaniment

Rhythm Patterns: 120

Tempo: Variable (226 steps, = 30 to 255)

Chords: 3 fingering methods (CASIO CHORD, FINGERED, FULL RANGE CHORD)

Rhythm Controller: START/STOP, INTRO, NORMAL/NORMAL FILL-IN, VARIATION/ VARIATION FILL-

IN, SYNCHRO/ENDING

Accomp Volume: 0 to 127 (128 steps)

One Touch Presets: Recalls settings for tone, tempo, layer, and split.

3-step Lesson: 3 lessons (Step 1, 2, 3)

Playback: Repeat play of a single tune

Evaluation Mode: Scoring 1, Scoring 2, Scoring 3, Phrase Practice

Voice Fingering Guide: On/Off

Song Bank, Piano Bank

Number of Tunes: Song Bank/Sing Along: 50, Piano Bank: 50, download songs: Up to 10

Controllers: PLAY/STOP, PAUSE, FF, REW, LEFT/RIGHT

Musical Information Function:

Tone,AutoAccompaniment, Song Bank, Piano Bank, SingAlong numbers and names;

staff notation, tempo, metronome, measure and beat number, step lesson display,

chord name, fingering, pedal operation, Keyboard, Song Bank icon, Piano Bank icon,

Sing Along icon, Voice Fingering Guide, Evaluation Mode, song memory indicator

Sing Along Mode

Number of Tunes: Song Bank/Sing Along: 50, download songs: Up to 10 (Approximately 70 kilobytes)

Controllers: PLAY/STOP, KEY CONTROL (25 steps, –12 semitones to +12 semitones)

Metronome: On/Off

Beat Specification: 0, 2 to 6

Song Memory

Number of Songs: Two (1 Lesson Recording, 1 Performance Recording)

Recorded Data: Lesson Recording: Right-hand part, left-hand part, both-hand parts

Performance Recording: Track 1 (chord accompaniment), Track 2 (melody)

Recording Method: Real-time

Memory Capacity: Approximately 12,000 notes (total for two songs)

Other Functions

Transpose: 25 steps (–12 semitones to +12 semitones)

Tuning: 101 steps (A4 = approximatery 440Hz ±50Cents)

Terminals

USB port

Sustain/Assignable Jack: Standard jack (sustain, sostenuto, soft, rhythm start/stop)

Headphone/Output Terminal:

Stereo standard jack

Output Impedance: 100Ω

Output Voltage: 4V (RMS) MAX

Microphone In: Standard jack (with microphone volume knob)

Input impedance: 3KΩ

Input sensitivity: 10mV

— 2 —

Power Jack: 9V DC

Power Supply: 2-way

Batteries: 6 D-size batteries

Battery Life: Approximately 9 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 batter

power only, can be disabled manually.

Speaker Output: 2.5W + 2.5W

Power Consumption: 9V 7.7W

Dimensions: 96.0 x 37.5 x 14.0 cm (37 13/16 x 14 3/4x 5 1/2inch)

Weight: Approximately 5.4 kg (11.9 lbs)(without batteries)

• Design and specifications are subject to change without notice.

ELECTRICAL

Current drain with 9 V DC:

Consumption Current 650 mA ±20 %

Consumption Current at idle 185 mA ±20 %

with 12 keys from C1 to G2 pressed in 233 SINE LEAD

Volume: maximum, Velocity: maximum

Speaker output level (Vrms with 4 Ωload each channel):

with key D1 in 233 SINE LEAD

Volume: maximun, Velocity: maximum 2020 mV ±20 %

Phone output level (Vrms with 32 Ωload each channel):

with key D1 in 233 SINE LEAD

Volume: maximun, Velocity: maximum 465 mV ±20 %

Output level (Vrms with 47K Ωload each channel):

with key D1 in 233 SINE LEAD

Volume: maximun, Velocity: maximum 2150 mV ±20 %

— 3 —

BLOCK DIAGRAM

R/W

LDB4 ~ 7

Keyboard

MAIN PCB

(M706-MDA1)

CONSOLE PCB

(M706-CNA2)

Speakers

(L)

(R)

Main

Volume

CONSOLE PCB

(

M706-CNA1)

SUB PCB

(

M706-PSA1)

AC ADAPTOR

DC 9V

MPU

ML6763B-NNWA-116

IC4

Filter

NJM2068DD

IC3

Power AMP

LA4598-E

IC2

ROM(4MB)

MR27V3202F-TN

IC11

RAM(1M bit)

CY62126DV30LL55ZI

IC12

Phones/

Output

CONSOLE PCB

(M06-CNA3)

Mic Volume

Filter

NJM2068DD

IC1

74AHCT

IC5, 6

MIC

LCD Controller

ST7066U

IC1

Power Supply

Q2 ~ Q4

VD5

(5.3V)

Battery

(9.0V) VCP

(9.0V)

VA5

(5.3V)

Button

MD0 ~ 15

MA1 ~ 16

MA1 ~ 17

KC0 ~ 7

FI0 ~ 3, SI0 ~ 3

FI4 ~ 7, SI4 ~ 7

Keyboard PCB

(JCM618T-KY1M) Keyboard PCB

(JCM618T-KY2M)

FI8 ~ 10, KI0 ~ 2

KC0 ~ 7

— 4 —

CIRCUIT DESCRIPTION

KEY MATRIX

KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7

FI0 C21C#21D21D#21E21F21F#21G21

SI0 C22C#22D22D#22E22F22F#22G22

FI1 G#21A21A#21B21C31C#31D31D#31

SI1 G#22A22A#22B22C32C#32D32D#32

FI2 E31F31F#31G31G#31A31A#31B31

SI2 E32F32F#32G32G#32A32A#32B32

FI3 C41C#41D41D#41E41F41F#41G41

SI3 C42C#42D42D#42E42F42F#42G42

FI4 G#41A41A#41B41C51C#51D51D#51

SI4 G#42A42A#42B42C52C#52D52D#52

FI5 E51F51F#51G51G#51A51A#51B51

SI5 E52F52F#52G52G#52A52A#52B52

FI6 C61C#61D61D#61E61F61F#61G61

SI6 C62C#62D62D#62E62F62F#62G62

FI7 G#61A61A#61B61C71

SI7 G#62A62A#62B62C72

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 B6A6G6F6E6D6 C7

C#3A#2G#2

F#2D#2

C#2 A#6

G#6F#6D#6

C#6

NOMENCLATURE OF KEYS

BUTTON MATRIX

KC4

SCORING

STEP 2

STEP 3

SCORING

LEFT

SCORING

KC5

SPLIT

AUTO

HARMONIZE

LAYER

RIGHT

–

KC2

PLAY/

STOP

TEMPO씱

SONG

BANK

REW

PAUSE

KC3

TEMPO씰

PIANO

BANK

STEP 1

METRONOME

SPEAK

PRACTICE

PHRASE

KC0

ECHO

PLAY/

STOP

SING

ALONG

KEY CONTROL/

TRANSPOSE

씱

KC1

REVERB/

CHORUS

ONE TOUCH

PRESET

REPERT

KEY CONTROL/

TRANSPOSE

씰

SETTING

SONG

MEMORY

KC6

RHYTHM

KC7

TONE

KI0

KI1

KI2

FI8

FI9

FI10

— 5 —

PRINTED CIRCUIT BOARD

MAIN PCB M706-MDA1

Top View

Bottom View

Main PCB M706-MDA1

— 6 —

CONSOLE PCB M706-CNA1

SUB PCB M706-PSA1 CONSOLE PCB M706-CNA2 CONSOLE PCB M706-CNA3 CONSOLE PCB M706-CNA4

— 7 —

DISASSEMBLY

1. Remove the battery cover and then battery.

2. Remove 27 screws and then upper case.

3. Remove two lead wires by soldering.

4. Remove two connectors by soldering.

5. Make the keyboard unit and the main unit apart.

red

black

Connector (CN3)Connector (CN4)

— 8 —

■To remove the main PCB (M706-MD1).

6. Remove three screws on the PCB (M706-MD1).

7. Remove four connectors by soldering.

8. Remove the PCB (M706-MD1).

■Precaution while assembling the main PCB (M706-MD1).

Number of pins on the PCB and pins on the cable are different.

Start connecting from the NO.1 pin whose color is orange.

11 pin cable

CN2 Connector (13pin)

■To remove the sub PCB (M706-PSA1).

9. Remove five screws on the PCB (M706-PSA1).

10. Remove two connectors by soldering.

11. Remove five lead wires by soldering.

12. Remove the PCB (M706-PSA1).

Connector (CN7)

Connector (CN8) Connector (CN2)

Connector (CN1)

Connector (CN9)

Connector (CN3)

Lead wire (orange)

Speaker cord (blue)

Speaker cord (brown)

Speaker cord (green)

Speaker cord (white)

— 9 —

■To remove the console PCB (M706-CNA1, CNA2, CNA3).

13. Remove the microphone and the volume knob.

14. Remove two screws on the PCB (M706-CNA2).

15. Remove three screws on the PCB (M706-CNA3).

16. Remove 30 screws and then the PCB (M706-CNA1).

Caution while assembling: 6 screws fixing the LCD unit are different size from other screws.

Fixing with incorrect size of screws causes the risk of defective displaying.

Be sure to choose correct screws.

17. Remove the rubber keys.

■To remove the speaker.

18. Remove 8 screws and then two speakers.

Note: Fix speaker cords securely.

— 10 —

■To remove the key PCB (CSM618T-KY1M, KY2M)

19. Remove 13 screws and the bottom case.

Projection

Note: Tighten the screw with the arrow mark in the figure first when reassembling.

20. Remove 19 screws and then the key PCB (CSM618T-KY1M, KY2M).

21. Remove the rubber keys.

Note: Pay attention to the positions of the rubber keys

as one of them has a different length. Match

the projections of the rubber keys with the holes

of the lower case when reassembling.

— 11 —

Note: Pay attention to the positions of the screw

holes when reassembling.

23. Remove the black keys.

22. Remove 21 screws and then the white keys.

— 12 —

DIAGNOSTIC PROGRAM

■Initial Setting

1. Connect the AC adaptor.

2. Connect a Sustain pedal.

3. "MODE" switch: NORMAL

4. "Main" volume: MAX

NOTE: If there is no Sustain pedal, Sustain pedal check can be skipped.

■How to start diagnostic program

1. Press the “POWER” button while pressing the “0” buttons.

2. The massage “TST” is displayed on LCD.

3. Release the “0” button.

■Diagnostic program Message on LCD

1. Button check

1Press “0” button. 00

* Wait for confirmation sound.

2Slide switches or press buttons in the order from No.01 to No.2E. BUTTON NO.

NOTE: The button numbers are written in hexadecimal numerals.

3Press the “SPLIT” button the last. COK

*Wait for confirmation sound.

*The Button number appears on the LCD. BUTTON NO.

*A buzzer sounds if buttons are pressed in a wrong order, and "CER" appears on LCD.

NOTE: This check cannot be aborted in mid-course.

2. AC adaptor check

1Press “-” button. JOK

3. RAM check

1Press “+” button. AOK

4. Pedal check

1Press “1” button. TCH

2“Sustain pedal”: ON SUS

3“Sustain pedal”: OFF

5. ROM check

1Press “2” button. OOK

05 06 07 08 09

0A 0B

0C 0D 0E 0F 10 11 12 13 14 15

16 17

1A 191B

1C 1D 1E 1F

21 22

2ECOK

— 13 —

Message on LCD

6. Version check

1Press “3”button. 706

2Press “3”button. 350

3Press “3”button. 340

7. Sound check

1Press the “4”button. MIN

*When standing in the center, the tester hears the minimum test sound in an equal

volume from both right and left speakers.

2Press the “5”button. MID

*When standing in the center, the tester hears the medium test sound in an equal

volume from both right and left speakers.

3Press the “6”button. MAX

*When standing in the center, the tester hears the maximum test sound in an equal

volume from both right and left speakers.

4Press the "7" button. L

*When standing in the center, the tester hears the maximum test sound fromthe left

speaker.

5Press the "8" button. R

*When standing in the center, the

tester

hears the maximum test sound from the right

speaker.

8. LCD check

1Press the “STEP1”button.

* All character of LCD turns on.