Casio CTK-680 User Manual
CTK-680
GM SOUND KEYBOARD
CTK-680
CONTENTS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Major Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Printed Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SPECIFICATIONS
GENERAL
Model: CASIO CTK-680
Keyboard: 61-key, 5-octave standard size keyboard with touch response (three sensi-
tivity levels and OFF setting)
Tones: 128 tones (Conform with General MIDI level 1) + 8 drum sounds with split/
layer features.
Polyphony: 32 notes maximum
Digital effects: 10
REVERB 1, REVERB 2, REVERB 3, CHORUS, TREMOLO, PHASE
SHIFTER, ORGAN SPEAKER, ENHANCER, FLANGER, LOUDNESS
Musical pads: 120 (four pads × 30 sets)
Phrases (22 sets), drums/percussion (7 sets), controller (1 set)
Phrases matche chord
Demo tunes: 3, sequential repeat playback
Auto-accompaniment
Rhythm patterns: 100
Tempo: Adjustable (216 levels, q = 40 to 255)
Chords: 3 types (CASIO Chords, Fingered, Full-Range Chords)
Parts: Rhythm, bass, Chord 1, Chord 2, Chord 3 (adjustable on/off, tone, volume,
pan, effect send, fine tune, coarse tune, expression settings)
Others: Intro, Normal Fill-in, Variation Fill-in, Synchro/Ending
Magical presets: 50 types (Break Beat, Melodycomp, Shadow Drum, Free Session)
Registration memory: 10
Tone changes, tempo setting, auto-accompaniment volume setting, mode,
layer on/off, Mixer settings, effect type, split on/off, rhythm type, autoaccompaniment rhythm assignment, pad type, chord fingering method,
touch response setting, MIDI settings (including assignable jack settings),
Magical Preset type
Mixer
Number of channels: 16
Parameters: TONE, VOLUME, PAN, EFFECT SEND, FINE TUNE, COARSE TUNE,
EXPRESSION
Multi-track memory
Number of songs: 2
Tracks: 6 (tone, volume, auto accompaniment, magical presets, pan, effect send, fine
tune, coarse tune, expression)
Type: Real-time
Capacity: Approximately 5,200 notes
— 2 —
Other functions
Transpose: 25 levels (1 octave lower C to 1 octave upper C)
Tuning: Adjustable: A4 = 440 Hz ± 50 cents
Pitch Bender: Adjustable range: ± 12 semitones (bend up, bend down, bend saw) using
musical pads
Modulation: Vibrato setting and performances are done by a Musical pad.
MIDI: 16-timbre multi-timbre receive (General MIDI Level 1)
Speakers: 12 cm diameter × 2 (output: 2.5 W + 2.5 W)
Input/Output Jacks
Power supply: 9 V DC
Headphones: Stereo mini jack
Output jacks: Output impedance: 120 Ω
Output voltage 4.2 V (RMS) MAX
Assignable Jack: Standard jack (sustain, sostenuto, soft, rhythm start/stop)
MIDI terminals: IN, OUT
Power supply: 2-way
Batteries: Six D-size batteries
Battery life: Approximately 5 hours on R20P (SUM-1) manganese batteries
AC adaptor: AD-5 (optional)
Auto power off: Approximately six minutes after last key operation under battery power
(disabled when AC adaptor is connected).
Power consumption: 9 V --- 7.7 W
Dimensions: 94.2 × 36.7 × 13.5 cm (31-7/16 × 14-1/2 × 4-3/8 inches)
Weight: 5.2 kg (11.7 lbs) excluding batteries
ELECTRICAL
Current drain with 9 V DC:
No sound output 320 mA ± 20%
Maximum volume
with 12 polyphonic notes in tone No. 022 960 mA ± 20%
Volume; maximum
Phone output level (Vrms with 8 Ω load each channel): Left channel 115 mV ± 20%
with key C6 pressed in tone No. 042
Line output level (Vrms with 47 kΩ load each channel): Left channel 1280 mV ± 20%
with key C5 pressed in tone No. 042
Minimum operating voltage: 5.75 V
— 3 —
BLOCK DIAGRAM
LC1 ~ LC4, LC8
MIDI
IN
OUT
Keyboard
FI0 ~ FI7
SI0 ~ SI7
Key Controller
LSI16
HG52E35P
KC0 ~
KC7
A0 ~ A2
LED Driver
Q15 ~ Q18
LD0 ~
LD7
CPU
LSI14
HD6433294A33F
D0~D7
La ~ Lg, Lp
A0 ~
A14
A0 ~ A14
7-seg. LED
KOC
KOD
CLK
NMI
RES
LEDs
Gate Array
LSI17
UPD65611GB-019
KI1 ~ KI4
LED Driver
IC301
BA612
KO1 ~ KO4, KO8
KO0 ~
KO9
Reset IC
IC13
RH5VL36AA
Working Storage RAM
(256K-bit)
TC55257DFL-70L
Buttons
Power Switch
LSI15
Effect RAM
(256K-bit)
LSI13
LC33832M-70
Speakers
EA0 ~ EA14
ED0 ~ ED7
Output
A0 ~ A3
DSP
IC11
HG51B155FD
WCK1 SLOP BCK
D/A Converter
IC11
UPD6376GS
Filter
Q208
Main
Volume
Power Amplifier
IC202
LA4598
Filter
Q207
RA0 ~ RA20
RD0 ~ RD15
VC
Sound Source ROM
(24M-bit)
LSI12
MX23C2410MC-12CA54
LVDD
VCC
Power Supply Circuit
IC203, Q201 ~ Q206
DVDD
AVDD
VDD
— 4 —
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) C#6 (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)
Note: Each key has two contacts, the first conatct (1) and second contact (2).
Key
FI
Second contact (2)
First contact (1)
KC
SI
— 5 —
NOMENCLATURE OF KEYS
C#2
F#2D#2
C#3A#2G#2
D#3
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
C#6
G#6F#6D#6
A#6
C2 D2E2F2G2A2 B2 C3 D3
BUTTON MATRIX
KO0 MODE PAD A PAD B PAD D
KO1 TEMPO UP TEMPO DOWN START/STOP PAD C
KO2 RHYTHM TONE
KO3
KO4 DEMO
KO5
KO6 987+
MAGICAL
PRESET
SYNCHRO/
ENDING
E3
F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5
C6
KI1 KI2 KI3 KI4
LAYER SPLIT
TOUCH
RESPONSE
DIGITAL EFFECT REGISTRATION
VAR/FILL-IN NORMAL/FILL-IN INTRO
B6A6G6F6E6D6
C7
KO7 —456
KO8
ACCOMP
VOLUME
MULTI-TRACK
MEMORY
TRANSPOSE/
TUNE/MIDI
MIXER
KO9 0123
POWER SUPPLY CIRCUIT
The power supply circuit generates six voltages as shown in the following table. VDD voltage is always
generated. The others are controlled by APO signal output from the CPU.
Name Voltage For operation of
VDD +5.0 V CPU, Reset IC, Working storage RAM, Gate array
DVDD +5.2 V DSP, Key controller, Sound source ROM, Effect RAM
AVDD +5.0 V DAC, Filter
LVDD +5.0 V LED Driver
VCC +12 V Pilot lamp
VC +12 V Power amplifier
— 6 —
CPU (LSI14: HD6433294A33F)
The 16-bit CPU contains a 32k-bit ROM, a 1k-bit RAM, seven 8-bit I/O ports, an A/D convertor and MIDI
interfaces. The CPU gains access to the working storage RAM, the DSP and the key controller. The CPU
interprets MIDI message using the working storage RAM. The CPU also controls buttons and LEDs.
The following table shows the pin functions of LSI14.
Pin No. Terminal In/Out Function
1 P50/TXD Out MIDI signal output
2 P51/RXD In MIDI signal input
3 P52/SCK Out Reset signal output
4 -RESET In Reset signal input
5 -NMI In Power ON trigger signal input
6 VCC In +5 V source
7 -STBY In Standby signal input. Connected to +5 V.
8 VSS In Ground (0 V) source
9, 10 XTAL, EXTAL In 16 MHz clock input
11, 12 MD1, MD0 In Mode selection input
13 AVSS In Ground (0 V) source
14 P70 In Analog input terminal for the pitch bend wheel
15 ~ 21 P71 ~ P77 Ou t Input terminals from keys (KI1 ~ KI7)
22 AVCC In +5 V source
23 ~ 30 P60 ~ P67 Out LED drive signal output
31 VCC In +5 V source
32 ~ 48 A0 ~ A15 O ut Address bus
40 VSS In Ground (0 V) source
49 ~ 56 D0 ~ D7 In/Out Data bus
57 P40 Out KO signal data
58 P41 Out Clock for KO signal generator
5 9 P42 Out APO signal output
60 P43 Out Read enable signal output
61 P44 In Write enable signal output
6 2 P4 5 — Not used
63 P46 Out 16 MHz clock output
6 4 P 47 — Not used. Connected to +5 V source.
DIGITAL SIGNAL PROCESSOR (LSI11: HG51B155FD-1)
Upon receipt of note numbers and their velocities, the DSP reads sound and velocity data from the sound
source ROM in accordance with the selected tone; the DSP can read rhythm data simultaneously when a
rhythm pattern is selected. Then it provides 16-bit serial signal containing data of the melody, chord,
bass, and percussion to the DAC. When an effect is selected, the DSP adds the effect to the sound data
using a 256k-bit RAM.
The following table shows the pin functions of LSI11.
— 7 —
Pin No. Terminal In/Out Function
1 ~ 8 CD0 ~ CD7 In/Out Data bus
9, 10 CE1, TRSB — Not used
11 GND7 In Ground (0 V) source
12 CK16 Out Terminal for 24.576 MHz clock check point
13 VCC6 In +5 V source
14 CK0 In Clock input. Connected to terminal CK16.
1 5 TCKB — Not used
16 VCC1 In +5 V source
17 GND1 In Ground (0 V) source
18, 19 XT0, XT1 In/Out 24.576 MHz clock input/output
20 SGL In System control terminal. Single chip system: Open
21 CCSB In Chip select signal input
22 ~ 25 CA0 ~ CA3 In Address bus
2 6 CE0 In Not used. Connected to ground.
27 CWRB In Write enable signal
28 CRDB In Read enable signal
29 ~ 32 — — Not used
33 RESB In Reset signal input
34 TESB In Not used. Connected to +5 V.
35 ~ 39 — — Not used
40 ~ 49
52 ~ 57
RD0 ~ RD15 Data bus for the sound source ROMIn
50 VCC2 In +5 V source
51 GND2 In Ground (0 V) source
58 RA23 Out Not used
59 RA22 Out Chip select signal for the sound source ROM
60 RA21 Out Not used
61 ~ 73
75 ~ 82
RA0 ~ RA20 Address bus for the sound source ROMOut
74 GND5 In Ground (0 V) source
8 3 WOK2 Out Not used
84 VCC3 In +5 V source
85 GND3 In Ground (0 V) source
86 WOK1 Out Word clock for the DAC
87 SOLM O u t Not used
88 SOLP Out Serial sound data output
8 9 BO K O u t Bit clock output
90 ~ 92 — — Not used
93 VCC5 In +5 V source
94, 95
97 ~ 105
107, 109
EA0 ~ EA14 Address bus for the effect RAMOut
110, 112
96 EWEB Out Write enable signal for the effect RAM
— 8 —
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