Casio CTK-611 User manual

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
MC-Service

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

— 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 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)
MC-Service

— 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 Ωload 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 Ωload 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 Ωload 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.

— 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
DVDDLVDD 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
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
MC-Service

— 4 —
KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7
FI10 Drum Pad Drum Pad Pitch Bend H9 6 + Tone
31HEnter
KI0 Drum Pad Drum Pad Pitch Bend Start/ 8 3 — Rhythm
42GStop
KI1 Drum Pad Step Tempo E7 2 0 Demo
5H
KI2 Drum Pad Memory Tempo F45 1
Transpose/
6GTune/MIDI
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)
CIRCUIT DESCRIPTION
KEY MATRIX
BUTTON MATRIX
PA0 PA1 PA2 PA3
PB0 Full Range Intro Touch Reverb
Chord Response
PB1 Fingered Normal/ Free Session Accomp
Fill-In Volume
PB2 Casio Chord Synchro/ Layer Synth
Ending
PB3 Normal Variation/ Split Mixer
Fill-In

— 5 —
Reset IC
IC1
RN5VD40AA
DSP
LSI2
HG51B277FB-1
VDD
Reset signal
To power supply circuit
VDD Battery set
RESET
VDD
POWER
From power switch NMI
APO
PLE
CPU
LSI1
UPD913GF-3BA
SCKO
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
Key
Second contact (2) First contact (1) FI
KC
SI
Note: Each key has two contacts,
the first conatct (1) and second contact (2).
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.
NOMENCLATURE OF KEYS
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.
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
MC-Service

— 6 —
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
8 AN0 In AC adaptor detection terminal.
+5 V when the keyboard is powered by batteries and becomes
0 V to cancel the APO function when AC adaptor is connected.
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 FI0 ~ FI3 In Terminal for key input signal
SI0 ~ SI3
31 ~ 38 KC0 ~ KC7 Out Terminal for key scan signal
39 ~ 46 FI4 ~ FI7 In Terminal for key input signal
SI4 ~ SI7
47 ~ 50 FI8, FI9 — Not used
SI8, SI9
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

— 7 —
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.
Pin No. Terminal In/Out Function
80 VCC In +5 V source
81 GND In Ground (0 V) source
82 MRDB Out Read enable signal output for the sound source ROM
83 ~ 98 MD0 ~ MD15 In/Out Data bus
99 PLE Out Reset signal output for the DSP
100 P17 In/Out Data bus for the LCD driver
Pin No. Terminal In/Out Function
1 ~ 3, 80 PB0 ~ PB3 In Button input terminals
4 PB4 In ASSIGNABLE Jack input
5 SO Out Serial sound data output for the DAC
6 WCKO Out Word clock output for the DAC
7 VDD3 In +5 V source
8 TEST — Not used
9 RESB In Reset signal input
10 VSS2 In Ground (0 V) source
11, 12 XIN, XOUT In/Out 20 MHz clock input/output
13 WCKI In Word clock input from the CPU
14 SI In Serial sound data input from the CPU
15 BCKI In Bit clock input from the CPU
16 SINC In 1 MHz synchronizing pulse input
17 VDD2 In +5 V source
18 ~ 25 IO0 ~ IO7 In/Out Data bus
26 RCEB Out Chip enable signal output for the working storage RAM
27 VSS3 In Ground (0 V) source
28 AD1 In Address bus
29 OEB Out Output enable signal for working storage RAM
30 WEB In Write enable signal
31 VDD3 In +5 V source
32 CE2 In Chip enable signal input. High active.
33 AD0 In Address bus
34 CE1B In Chip enable signal input. Low active.
35 ~ 41, 43 EIO0 ~ EIO7 In/Out Data bus for the effect RAM
MC-Service

— 8 —
LCD DRIVER (LSI401: SED1278F2A)
The LCD driver can drive a dot matrix LCD having 40 segment and 16 common lines. The LSI contains 240
graphic symbols in the built-in character generator ROM, and stores 80 characters in the built-in display data
RAM. In accordance with command from the CPU, the LSI is capable of displaying up to 16 characters
simultaneously. The following table shows the pin functions of LSI 401.
Pin No. Terminal In/Out Function
42 , 44, 46 ~ 48, EA0 ~ EA12 Out Address bus for the effect RAM
51 ~ 59, 61
45 ECEB Out Chip enable signal output for the effect RAM
49 EOEB Out Read enable signal output for the effect RAM
50 VSS3 In Ground (0 V) source
60 EWEB Out Write enable signal output for the effect RAM
62, 66, 70, 74, 78 VSS2 In Ground source
63, 67, 71, 75, 79 VDD2 In +5 V source
64, 65, 68, 69, PA0 ~ PA5 Out Button scan signal output
72, 73
76, 77 PA6/7 Out Not used
Pin No. Terminal In/Out Function
1 ~ 22, SEG1 ~ SEG40 Out Segment signal output
63 ~ 80
23 VSS — GND (0 V) source
24, 25 OSC1, OSC2 In/Out Terminals for the built-in clock pulse generator. The external
resistor connected determines the oscillation frequency.
26 ~ 30 V1 ~ V5 In LCD drive voltage input.
Those voltages are used for generating the stepped pulse of
the LCD drive signals.
31, 32 LP, XCLS — Not used
33 VDD In DVDD (+5 V) source
34, 35 FR, DO — Not used
36 RS In Data/command determination terminal.
High: data, Low: command
37 R/W In Read/write terminal. High: read, Low: write
38 E In Chip enable signal.
High: enable, the writing is done at fall edge.
Low: disenable
39 ~ 42 DB0 ~ DB3 — Not used. Connected to GND (0 V)
43 ~ 46 DB4 ~ DB7 In/Out Data bus
47 ~ 62 COM1 ~ COM16 Out Common signal/output