Casio CTK-611 Service manual

CTK-611

INDEX

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

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

DEMO

TRANSPOSE/

TUNE/MIDI

FREE

SESSION

LAYER

SPLIT

TOUCH

RESPONSE

RHYTHM TONE

CURSOR

ENTER

ENVELOPE

AMP

PITCH

ENVELOPE

ENVELOPE

000-048 DECAY 00 FLAT

049-137 SUSTAIN 01-19 VIBRATO

20-49 OTHERS

CTK-611

ELECTRONIC KEYBOARD

CONTENTS

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

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

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

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

Major Waveforms ........................................................................................................................... 12

Printed Circuit Boards .................................................................................................................... 13

Schematic Diagrams ...................................................................................................................... 14

Exploded View ............................................................................................................................... 19

Parts List ........................................................................................................................................ 20

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: START/STOP, INTRO, NORMAL/NORMAL FILL-IN, VARIATION/VARI-

ATION FILL-IN, SYNCHRO/ENDING

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)

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: 6 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.
Speaker output: 2.5 W + 2.5 W
Power consumption: 9 V --- 7.7 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)

— 1 —

ELECTRICAL

Current drain with 9 V DC:
No sound output 340 mA ± 20 %
Maximum volume 1012 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): L-ch 90 mV ± 20 %

with key C6 pressed in Bassoon tone R-ch 100 mV ± 20 %
Volume: maximum, Touch response: maximum
Reverb: Hall

Speaker output level (Vrms with 4 Ω load each channel): L-ch 1150 mV ± 20 %

with key F5 pressed in Bassoon tone R-ch 1000 mV ± 20 %
Volume: maximum, Touch response: maximum
Reverb: Hall

Output level (Vrms with 47k Ω load each channel): L-ch 1200 mV ± 20 %

with key F5 pressed in Bassoon tone R-ch 1000 mV ± 20 %
Volume: maximum, Touch response: maximum
Reverb: Hall

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 —

BLOCK DIAGRAM

Reset IC

IC1

RN5VD40AA

Sound Source ROM

(16M-bit)

LSI3

UPD23C16000WGX-

C51

Effect RAM

(256K-bit)

LSI5

TC55257DFL-

70L(EL)

RESET

MA0 ~ MA19

MA0, MA1

EA0 ~
EA14

EIO0 ~
EIO7

Working Storage

RAM (256K-bit)

LSI4

TC55257DFL-70L(EL)

MA0

~

MA14

MD0 ~ MD15

MD0

~

MD7

DSP
LSI2

HG51B277FB-1

MIDI

LRCK, SO
BCK, SINK

INOUT

UPD913GF-3BA

P10, P13
P14, P17

CPU
LSI1

NMI

PA0 ~ PA5

PB0 ~ PB3

P23

FI10

LCD Driver

LSI401

SED1278F2A

FI0 ~ FI9
SI0 ~ SI9

KC0 ~ KC7

KI0 ~ KI2
PB0 ~ PB3

VDD

SEG1 ~ SEG40

LCD

COM1 ~ COM16

Keyboard

Power Switch

Buttons

Speakers

Output

LRCK
SO
BCK

D/A Converter

LSI6

UPD6379GR

Filter

Q107 ~ Q110

Main
Volume

Power Amplifier

IC101

TA8248K

PB4

APO

Assingnable Jack

VCC

AVDD

Power Supply Circuit

Q101 ~ Q105,

D106/107, D190

DVDDLVDD

VDD

VC

— 3 —

CIRCUIT DESCRIPTION

KEY MATRIX

KC0 KC1 KC2 KC3 KC4 KC 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) #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 (2)
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

KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7

Drum Pad Drum Pad Pitch Bend H

FI10

KI0

KI1

KI2

PB0

PB1 Fingered

PB2 Casio Chord

PB3 Normal

31HEnter

Drum Pad Drum Pad Pitch Bend Start/

42GStop

Drum Pad

5 H

Drum Pad

6 G Tune/MIDI

PA0 PA1 PA2 PA3

Full Range

Chord Response

Step

Memory

Normal/

Synchro/

Ending

Variation/

Tempo

Tempo

Intro

Fill-In Volume

Fill-In

E 7 2 0 Demo

F 45 1

Touch

Free Session

Layer Synth

Split Mixer

9 6 + Tone

8 3 — Rhythm

Transpose/

Reverb

Accomp

— 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)

FI

KC

SI

C#2

C2 D2E2F2

F#2D#2

G2

A2 B2 C3 D3

C#3A#2G#2

F#3 G#3

D#3

E3

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

C6

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.

Name Voltage For operation of

VDD +5 V CPU, Reset IC, DSP, Sound source ROM, Working storage RAM, Effect RAM
DVDD +5 V LCD driver, Power jack, Sustain jack, MIDI jack
AVDD +5 V DAC, Filter
LVDD +5.6 V LCD dirver

VCC +9 V Power amplifier, Pilot lamp

C7

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.

Pin No. Terminal In/Out Function

1 TXD0 Out MIDI signal output
2 RXD0 In MIDI signal input
3 SCK0 Out APO (Auto Power Off) signal output

4, 5 TXD1, RXD2 In/Out Data bus for the LCD driver

6 SCK1 Out 1 MHZ synchronizing pulse output
7 AVCC In DVDD (+5 V) source

AC adaptor detection terminal.

8 AN0 In

9 AN1 — Not used. Connected to ground.
10 AGND In Ground (0 V) source
11 BCK Out Bit clock output
12 SO Out Serial sound data output
13 LRCK Out Word clock output
14 GND In Ground (0 V) source

15, 16 XLT0, XLT1 In/Out 20 MHz clock input/output

17 VCC In +5 V source

18, 19 MD0, MD1 In Mode selection terminal

20 RSTB In Reset signal input
21 NMI In Power ON signal input
22 INT/P10 In/Out Data bus for the LCD driver

23 ~ 30
31 ~ 38 KC0 ~ KC7 Out Terminal for key scan signal

39 ~ 46

47 ~ 50

51 FI10 In Terminal for button input signal
52 SI10/P23 Out Chip enable signal for the LCD driver

53 ~ 55 KI0 ~ KI2 In Terminal for button input signal

56 MWNB Out Write enable signal for the DSP

57 ~ 76 MA0 ~ MA17 Out Address bus

77 MCSB0 Out Chip enable signal output for the sound source ROM
78 MCSB1 Out Not used
79 MCSB2 Out Chip enable signal output for the DSP

FI0 ~ FI3

SI0 ~ SI3

FI4 ~ FI7

SI4 ~ SI7

FI8, FI9

SI8, SI9

In Terminal for key input signal

In Terminal for key input signal

— Not used

+5 V when the keyboard is powered by batteries and becomes

V to cancel the APO function when AC adaptor is connected.

0

— 6 —