Casio CTK-601 Service manual

CTK-601

100 RHYTHMS

PITCH BEND MODE VOLUME INTRO SYNCHRO/ENDING

FULL RANGE CHORD FINGERED

POWER

CASIO CHORD NORMAL

MAX

MIN

NORMAL/FILL-IN VAR/FILL-IN

START

STOP

200 TONES

REVERB

HALL

STAGE

SYNTH

ROOM SYNTH MIXER

MEMORY

MIXER

TEMPO

STEP

MEMORY

MEMORY TRACK/DRUM PAD

CHORD/1 23456

STEP

ACCOMP VOLUME

GM FREE SESSION LAYER SPLIT TOUCH RESPONSE

TRANSPOSE/

TUNE/MIDI

SESSION

TOUCH

RESPONSE

RHYTHM TONE

DEMO

FREE

CURSOR

LAYER

SPLIT

ENTER

ENVELOPE

AMP

PITCH

ENVELOPE

000-048 DECAY 00 FLAT

049-137 SUSTAIN 01-19 VIBRATO

20-49 OTHERS

DIGITAL REVERB SYSTEM 2WAY MULTI-TRACK MEMORY

CTK-601

ELECTRONIC KEYBOARD

CONTENTS

Page

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

Block Diagram........................................................................................................................................... 3

Circuit Description..................................................................................................................................... 4

Adjustment .............................................................................................................................................. 11

Major Waveforms .................................................................................................................................... 13

Printed Circuit Boards ............................................................................................................................. 14

Schematic Diagrams ............................................................................................................................... 15

Exploded View ........................................................................................................................................ 20

Parts List ................................................................................................................................................. 21

SPECIFICATIONS

GENERAL

Keyboard: 61 standard-size keys, 5 octaves (with touch response on/off) Drum pads: 6 Tones: 200 (128 General MIDI, 32 synthesized, 8 drum, 32 user); with layer and

split Rhythm instrument tones: 51 Polyphony: 24 notes maximum (12 for certain tones) Digital effects: 3 reverb types (HALL, STAGE, ROOM) Auto accompaniment

Rhythm patterns: 100 Tempo: Variable (216 steps, = 40 to 255) Chords: 3 fingering methods (CASIO CHORD, FINGERED, FULL RANGE

CHORD)

Rhythm controller: ST ART/STOP, INTRO, NORMA/FILL-IN, VAR/FILL-IN, SYNCHRO/END-

ING

Accomp volume: 0 to 127 (128 steps)

Free session

Number of patterns 100 (auto-accompaniment in accordance with selected chord progres-

sion) Memory function

Songs: 2 Recording tracks: 6 (2 through 6 are melody tracks) Recording methods: Real-time, step Memory capacity: Approximately 5,200 notes (total for two songs)

Edit function: Equipped Demo tunes: 2 Synthesizer function

Parameters: PCM set, amp envelope set, attack rate, release rate, pitch envelope set,

pitch, level, touch sense, pan

Mixer function

Channels: 16

Parameters: Program change number, volume, expression, pan, coarse tuning, fine

tuning, on/off/solo MIDI: 16 multi-timbre receive, GM Level 1 standard Other functions

Pitch bend range: 12 semitones upwards and downwards Transpose: 25 steps (–12 semitones to +12 semitones) Tuning: Variable (A4 = approximately 440 Hz ± 50 cents)

— 1 —

Terminals

MIDI terminals: IN, OUT Assignable terminal: Standard jack (sustain, sostenuto, soft, rhythm start/stop) Headphone/Output terminal: Stereo standard jack

Output Impedance: 120 Ω

Output Voltage: 4.5 V (RMS) MAX

Power supply terminal: 9 V DC

Power supply Dual power supply system

Batteries: Six D-size batteries Battery life: Approximately 5 hours continuous operation on manganese batteries AC adaptor: AD-5 Auto power off: Turns power off approximately six minutes after last key operation. En-

abled under battery power only, can be disabled manually. Power consumption: 9 V --- 7.7 W Speaker output: 2.5 W + 2.5 W Dimensions (HWD): 93.1 × 37.3 × 12.0 cm (36 11/16 × 14 11/16 × 4 3/4 inches) Weight: Approximately 5.0 kg (11.0 lbs) (without batteries)

ELECTRICAL

Current drain with 9 V DC: No sound output 200 mA ± 20 % Maximum volume 810 mA ± 20 %

with 12 keys from C3 to B3 pressed in Square wave tone Volume: maximum, Touch response: maximum Reverb: Hall

Phone output level (Vrms with 8 Ω load each channel):

with key C6 pressed in Bassoon tone R-ch 100 mV ± 20 %

Speaker output level (Vrms with 4 Ω load each channel):

with key F5 pressed in Bassoon tone R-ch 1000 mV ± 20 %

Minimum operating voltage: 6.3 V

About General MIDI

General MIDI standardizes MIDI data for all sound source types, regardless of manufacturer. General MIDI specifies such factors as tone numbering, drum sounds, and available MIDI channels for all sound sources. This standard makes it possible for all MIDI equipment to reproduce the same nuances when playing General MIDI data, regardless of the manufacturer of the sound source. This keyboard supports General MIDI, so it can be used to play commercially available pre-recorded General MIDI data and General MIDI data send to it from a personal computer.

— 2 —

KC0 ~ KC7

FI0 ~ FI9 SI0 ~ SI9

KI0 ~ KI2 PB0 ~ PB3

P10, P13 P14, P17

Working Storage

RAM (256K-bit)

LSI4

TC55257DFL-70L(EL)

MIDI

EA0 ~ EA14

EIO0 ~ EIO7

Sound Source ROM

(16M-bit)

LSI3

UPD23C16000WGX-

C51

LRCK SO BCK

D/A Converter

LSI6

UPD6379GR

Filter

Q107 ~ Q110

Main Volume

Power Amplifier

IC101

TA8248K

Keyboard

MA0 ~ MA19

Power Supply Circuit

Q101 ~ Q105,

D106/107, D190

VCC

AVDD

VDD

DVDDLVDD

APO

Effect RAM

(256K-bit)

LSI5

TC55257DFL-

70L(EL)

MD0

MD7

Speakers

Output

MA0

MA14

MA0, MA1

LRCK, SO BCK, SINK

LCD

LCD Driver

LSI401

SED1278F0A

SEG1 ~ SEG40

INOUT

Reset IC

IC1

RN5VD40AA

RESET

COM1 ~ COM16

DSP LSI2

HG51B277FB-1

MD0 ~ MD15

CPU LSI1

UPD913GF-3BA

Buttons

Assingnable Jack

PB4

VDD

Power Switch

NMI

FI10

P23

PA0 ~ PA5

PB0 ~ PB3

BLOCK DIAGRAM

— 3 —

CIRCUIT DESCRIPTION

KEY MATRIX

KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7

FI0 C2 (1) C#2 (1) D2 (1) D#2 (1) E2 (1) F2 (1) F#2 (1) G2 (1) SI0 C2 (2) C#2 (2) D2 (2) D#2 (2( E2 (2) F2 (2) F#2 (2) G2 (2) FI1 G#2 (1) A2 (1) A#2 (1) B2 (1) C3 (1) C#3 (1) D3 (1) D#3 (1) SI1 G#2 (2) A2 (2) A#2 (2) B2 (2) C3 (2) C#3 (2) D3 (2) D#3 (2)

FI2 E3 (1) F3 (1) F#3 (1) G3 (1) G#3 (1) A3 (1) A#3 (1) B3 (1) SI2 E3 (2) F3 (2) F#3 (2) G3 (2) G#3 (2) A3 (2) A#3 (2) B3 (2) FI3 C4 (1) C#4 (1) D4 (1) D#4 (1) E4 (1) F4 (1) F#4 (1) G4 (1) SI3 C4 (2) C#4 (2) D4 (2) D#4 (2) E4 (2) F4 (2) F#4 (2) G4 (2) FI4 G#4 (1) A4 (1) A#4 (1) B4 (1) C5 (1) C#5 (1) D5 (1) D#5 (1) SI4 G#4 (2) A4 (2) A#4 (2) B4 (2) C5 (2) C#5 (2) D5 (2) D#5 (2) FI5 E5 (1) F5 (1) F#5 (1) G5 (1) G#5 (1) A5 (1) A#5 (1) B5 (1)

SI5 E5 (2) F5 (2) F#5 (2) G5 (2) G#5 (2) A5 (2) A#5 (2) B5 (2) FI6 C6 (1) C#6 (1) D6 (1) D#6 (1) E6 (1) F6 (1) F#6 (1) G6 (1) SI6 C6 (2) C6# (2) D6 (2) D#6 (2) E6 (2) F6 (2) F#6 (2) G6 (1) FI7 G#6 (1) A6 (1) A#6 (1) B6 (1) C7 (1) SI7 G#6 (2) A6 (2) A#6 (2) B6 (2) C7 (2)

BUTTON MATRIX

0CK1CK2CK3CK4CK5CK6CK7CK

01IF

0IK

1IK

2IK

0BP

1BPderegniF

2BPdrohCoisaC

3BPlamroN

daPmurD

0AP1AP2AP3AP

egnaRlluF

drohC

daPmurD

petS

yromeM

opmeT

ortnI

/lamroN

nI-lliF

/orhcnyS

gnidnE

/noitairaV

nI-lliF

dneBhctiP

retnE /tratS

potS

hcuoT

esnopseR

noisseSeerF

reyaLhtnyS

tilpSrexiM

96+ enoT

83— mhtyhR

720 omeD

451

breveR

pmoccA

emuloV

/esopsnarT

IDIM/enuT

— 4 —

Note: Each key has two contacts, the first conatct (1) and second contact (2).

NOMENCLATURE OF KEYS

Second contact (2)

Key

First contact (1)

C#2

C2 D2E2F2G2A2 B2 C3 D3

F#2D#2

C#3A#2G#2

F#3 G#3

D#3

F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5

A#3 C#4 D#4

F#4 G#4

A#4

C#5

D#5

F#5 G#5

A#5

C#6

G#6F#6D#6

A#6

B6A6G6F6E6D6

POWER SUPPLY CIRCUIT

The power supply circuit generates five voltages as shown in the following table. VDD voltage is always generated. The others are controlled by APO signal from the CPU.

emaNegatloVfonoitareporoF

DDVV5+ MARtceffE,MARegarotsgnikroW,MORecruosdnuoS,PSD,CIteseR,UPC

DDVDV5+kcajIDIM,kcajniatsuS,kcajrewoP,revirdDCL DDVAV5+retliF,CAD

DDVLV6.5+revridDCL

CCVV9+pmaltoliP,reifilpmarewoP

RESET CIRCUIT

When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU. The CPU then initializes its internal circuit, and clears the working storage RAM. When the power switch is pressed, the CPU receives a low pulse of POWER signal. The CPU sends APO signal to the power supply circuit, also sends a reset signal to the DSP.

Battery set

VDD

Reset IC

IC1

RN5VD40AA

POWER

From power switch

RESET

VDD

CPU LSI1

UPD913GF-3BA

SCKO

NMI

— 5 —

Reset signal

PLE

HG51B277FB-1

APO

To power supply circuit

VDD

DSP LSI2

CPU (LSI1: UPD913GF-3BA)

The 16-bit CPU contains a 1k-byte RAM, three 8-bit I/O ports, two timers, a key controller and serial interfaces. The CPU detects key velocity by counting the time between first-key input signal FI and second-key SI from the keyboard. The CPU reads sound data and velocity data from the sound source ROM in accordance with the selected tone; the CPU can read rhythm data simultaneously when a rhythm pattern is selected. Then the CPU provides 16-bit serial sound data to the DSP. The CPU also controls MIDI input/output and stores sequencer data into the working storage RAM. The following table shows the pin functions of LSI1.

.oNniPlanimreTtuO/nInoitcnuF

10DXTtuOtuptuolangisIDIM 20DXRnItupnilangisIDIM 30KCStuOtuptuolangis)ffOrewoPotuA(OPA

5,42DXR,1DXTtuO/nIrevirdDCLehtrofsubataD 61KCStuOtuptuoeslupgnizinorhcnysZHM1 7CCVAnIecruos)V5+(DDVD

.lanimretnoitcetedrotpadaCA

80NAnI

91NA— .dnuorgotdetcennoC.desutoN

01DNGAnIecruos)V0(dnuorG 11KCBtuOtuptuokcolctiB 21OStuOtuptuoataddnuoslaireS 31KCRLtuOtuptuokcolcdroW 41DNGnIecruos)V0(dnuorG

61,511TLX,0TLXtuO/nItuptuo/tupnikcolczHM02

71CCVnIecruosV5+

91,811DM,0DMnIlanimretnoitcelesedoM 02BTSRnItupnilangisteseR 12IMNnItupnilangisNOrewoP 2201P/TNItuO/nIrevirdDCLehtrofsubataD

03~32 83~137CK~0CKtuOlangisnacsyekroflanimreT 64~93

05~74

1501IFnIlangistupninottubroflanimreT 2532P/01IStuOrevirdDCLehtroflangiselbanepihC

55~352IK~0IKnIlangistupninottubroflanimreT

65BNWMtuOPSDehtroflangiselbaneetirW

67~7571AM~0AMtuOsubsserddA 770BSCMtuOMORecruosdnuosehtroftuptuolangiselbanepihC 871BSCMtuOdesutoN 972BSCMtuOPSDehtroftuptuolangiselbanepihC

3IF~0IF

3IS~0IS

7IF~4IF

7IS~4IS 9IF,8IF 9IS,8IS

nIlangistupniyekroflanimreT

—desutoN

V0semocebdnaseirettabybderewopsidraobyekehtnehwV5+

.detcennocsirotpadaCAnehwnoitcnufOPAehtlecnacot

— 6 —

.oNniPlanimreTtuO/nInoitcnuF

08CCVnIecruosV5+ 18DNGnIecruos)V0(dnuorG 28BDRMtuOMORecruosdnuosehtroftuptuolangiselbanedaeR

89~3851DM~0DMtuO/nIsubataD

99ELPtuOPSDehtroftuptuolangisteseR

00171PtuO/nIrevirdDCLehtrofsubataD

DIGITAL SIGNAL PROCESSOR (LSI2: HG51B227FB-1)

The DSP receives 16-bit serial sound data output from the CPU and adds the selected effect to the sound data using the effect RAM. Then the DSP provides the sound data to the DAC. The DSP also controls button input/ output. The following table shows the pin functions of LSI2.

.oNniPlanimreTtuO/nI

08,3~13BP~0BPnIslanimrettupninottuB 44BPnItupnikcaJELBANGISSA 5OStuOCADehtroftuptuoataddnuoslaireS 6OKCWtuOCADehtroftuptuokcolcdroW 73DDVnIecruosV5+ 8TSET—desutoN 9BSERnItupnilangisteseR

012SSVnIecruos)V0(dnuorG

21,11TUOX,NIXtuO/nItuptuo/tupnikcolczHM02 31IKCWnIUPCehtmorftupnikcolcdroW 41ISnIUPCehtmorftupniataddnuoslaireS 51IKCBnIUPCehtmorftupnikcolctiB 61CNISnItupnieslupgnizinorhcnyszHM1 712DDVnIecruosV5+

52~817OI~0OItuO/nIsubataD 62BECRtuOMARegarotsgnikrowehtroftuptuolangiselbanepihC 723SSVnIecruos)V0(dnuorG 821DAnIsubsserddA 92BEOtuOMARegarotsgnikrowroflangiselbanetuptuO 03BEWnIlangiselbaneetirW 133DDVnIecruosV5+ 232ECnI.evitcahgiH.tupnilangiselbanepihC 330DAnIsubsserddA 43B1ECnI.evitcawoL.tupnilangiselbanepihC

34,14~537OIE~0OIEtuO/nIMARtceffeehtrofsubataD

,84~64,44,24

16,95~15

54BECEtuOMARtceffeehtroftuptuolangiselbanepihC

21AE~0AEtuOMARtceffeehtrofsubsserddA

noitcnuF

— 7 —

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