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ELECTRONIC KEYBOARD
CTK-611
CTK-611
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POWER
FULL RANGE
CHORD
FINGERED
MAX
START
TEMPO
REVERB
SYNTH
MIXER
MEMORY
STEP
ACCOMP
VOLUME
STOP
MIN
CASIO CHORD
NORMAL
FREE
SESSION
TOUCH
RESPONSE
LAYER
SPLIT
CURSOR
PITCH BEND
MODE
VOLUME
INTRO
SYNCHRO/ENDING
NORMAL/FILL-IN
VAR/FILL-IN
REVERB
GM
FREE
SESSION
LAYER
SPLIT
TOUCH
RESPONSE
HALL
STAGE
ROOM
SYNTH
MIXER
MEMORY
STEP
CHORD/1
23456
MEMORY TRACK/DRUM PAD
DEMO
TRANSPOSE/
TUNE/MIDI
RHYTHM
TONE
ENTER
AMP
ENVELOPE
000-048 DECAY
00 FLAT
049-137 SUSTAIN 01-19 VIBRATO
20-49 OTHERS
PITCH
ENVELOPE
ENVELOPE
200 TONES
100 RHYTHMS
INDEX


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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


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-- 1 --
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
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)


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-- 2 --
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
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
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
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.


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-- 3 --
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
DVDD
LVDD
VC
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
SED1278F2A
SEG1 ~ SEG40
IN
OUT
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