CTK-671
INDEX
Ver.1 : SEP.2001
JUN. 2001
PLAY
RECORD
STEP RECORD
MAX
FULL RANGE
CHORD
FINGERED
CASIO CHORD
NORMAL
MIN
BANK STORE
(
TIE
)
3
REST
/NO
/YES
CTK-671
ELECTRONIC KEYBOARD
CONTENTS
Page
Specifications ..........................................................................................................................................................1
Block Diagram.........................................................................................................................................................3
Circuit Description ...................................................................................................................................................4
Printed Circuit Boards .............................................................................................................................................5
Schematic Diagrams ...............................................................................................................................................7
Exploded View ......................................................................................................................................................12
Parts List ...............................................................................................................................................................13
SPECIFICATIONS
GENERAL
Keyboard: 61 standard-size keys, 5 octaves with touch response (Off / Light / Normal / Heavy)
Tones: 348 total (100 panel tones + 128 GM tones + 10 drum sounds + 10 user tones + 100
Advanced Tones); layer/split
Rhythm Instrument Tones: 61
Polyphony: 32 notes maximum (16 for certain tones)
Effects: DSP (110 types: internal, 10 user areas) + Reverb (16 types) + Chorus (16 types)
Equalizer: 10 types, 4 bands
Auto Accompaniment
Rhythm Patterns: 104 (internal, 4 user areas)
Tempo: Variable (226 steps, = 30 to 255)
Chords: 3 fingering methods (CASIO CHORD, FINGERED, FULL RANGE CHORD)
Rhythm Controller: Start/Stop, INTRO/ENDING 1 and 2, VARIATION/FILL-IN 1 and 2, SYNCHRO/FILL-
IN NEXT
Accomp Volume: 0 to 127 (128 steps)
One-touch Presets: Recalls settings for tone, tempo, layer on/off, and harmonize on/off in accordance
with rhythm.
Auto Harmonize: Automatic addition of notes that harmonize with melody note in accordance with speci-
fied Auto Accompaniment chords.
Memory Function
Songs: 2
Recording Tracks: 6 (2 through 6 are melody tracks)
Recording Methods: Real-time, step
Memory Capacity: Approximately 3,500 notes (total for two songs)
* Same memory is shared for user rhythm storage.
Edit Function: Equipped
Demo Tunes: 2
Tune Number Name Composer Play Time
0 Crystal Fountain Edward Alstrom 1:54
1 Night Breeze Hage Software 1:52
Synthesizer Function
Parameters: Attack time; release time; resonance; cutoff frequency; vibrato type; vibrato delay;
vibrato depth; vibrato rate; octave shift; level; touch sense; reverb send; chorus send;
DSP line; DSP type and DSP parameter
Registration Memory
Number of Setups: 16 (4 setups × 4 banks)
Memory Contents: Tone select, Rh ythm select, Tempo settings, Split on/off, Split point settings, Layer on/
off, Mixer settings (Channels 1~10), Effect settings, Equalizer settings, Touch Re-
sponse settings, Assignable jack setting, Transpose settings, Tuning settings, Accom-
paniment volume settings, Harmonize on/off
— 1 —
Mixer Function
Channels: 16
Parameters: Channel on/off; tone; part on/off; volume; pan pot; octave shift; coarse tune; fine tune;
reverb send; chorus send; DSP line
MIDI: 16 multi-timbre receive, GM Level 1 standard
Other Functions
Transpose: 49 steps (–24 semitones to +24 semitones)
Tuning: Variable (A4 = approximately 440Hz ±100 cents)
LCD: Adjustable contrast
Terminals
MIDI Terminals: IN, OUT
Sustain/
Assignable Terminal: Standard jack (sustain, sostenuto, soft, rhythm start/stop)
Headphone/
Output Terminal: Stereo standard jack
Output Impedance: 140 ohms
Output Voltage: 4.5V (RMS) MAX
Power Supply Terminal: 9V DC
Power Supply: Dual power supply system
Batteries: 6 D-size batteries
Battery Life: Approximately 4 hours continuous operation on manganese batteries
AC Adaptor: AD-5
Auto Power Off: Turns power off approximately six minutes after last key operation. Enabled under
battery power only, can be disabled manually.
Speaker Output: 2.5W + 2.5W
Power consumption: 9V 7.7W
Dimensions: 96.0 × 37.5 × 14.7 cm (37 13/16 × 14 3/4 × 5 13/16 inch)
Weight: Approximately 5.8 kg (12.8lbs) (without batteries)
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 —
LCD Driver
CPU
(uPD914GM-3ED)
LSI1
RAM
(1Mbit)
UPD441000LGZ
LSI5
ROM
(32Mbit)
LSI3
RAM
(256kbit)
LSI4
IC11
FVDD
+5V
AVDD
+5V
DVDD
+5V
VCC
+9V
CLK
DO
WCK0
DAC
Filter
Main
Volume
Power Amp
Speakers
Keyboard
Key
Controller
Power supply Circuit
LSI2
Buttons
EA0 ~ EA16
ED12 ~ ED19
MA0 ~ MA3
CA0 ~ CA3
CD0 ~ CD15
FI8 ~ FI10
KI0 ~ KI2
KC0 ~ KC7
SI0 ~ SI7
FI0 ~ FI7
IC8
DB0
~
DB7
E
R/W
RS
Q1
CONT
IC4
IC5
MA0 ~ MA13,MA25
MA0 ~ MA20
VDD
+3.3V
MIDI IN
MIDI OUT
Reset
IC
MD0 ~ MD15
MD0 ~ MD7
CK0,LRC0,SC0,LRC1
DI
CLK
WCKIO
WCKI1
MSW0 ~ MSW3
MODE SWITCH
P10 ~ P13
— 3 —
BLOCK DIAGRAM
KEY MATRIX
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)
CIRCUIT DESCRIPTION
KC0 KC1 KC2 KC3 KC4 KC KC6 KC7
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
FI8
FI9
FI10
KI0
KI1 STORE
KI2 BANK A B C D
ONE
TOUCH
SONG
MEMORY
ACCOMP
VOLUME
INTRO/
ENDING1 /FILL-IN1
REVERB
CHORUS SYNTH
DSP MIXER SPECIAL + 1 2 3
VARIATION
INTRO/
ENDING2 /FILL-IN2 STOP UP
EQUALIZER
SYNCHRO AUTO
/CROSS FILL HIARMONIZE
VARIATION
RNYTHM TONE 7 8 9
START/ TEMPO
TRANSPOSE
DEMO - 0 SPLT
456
EXIT ENTER LAYER
TEMPO
DOWN
LEFT RIGHT
— 4 —
Main PCB JCM703-MA1M
PRINTED CIRCUIT BOARDS
Top View
Bottom View
— 5 —
Sub PCB KDM703-MA2M
— 6 —
Main PCB JCM703-MA1M
SCHEMATIC DIAGRAMS
— 7 —
Sub PCB JCM703-MA2M
— 8 —
Display PCB JCM703-LCD1M
— 9 —
Keyboard PCBs JCM618T-KY1M/KY2M
— 10 —
PCBs CONGDE JCM703-CN1/CN2
— 11 —
34
EXPLODED VIEW
33
14
24
32
22
20
18
16
15
25
30
27
4
29
35
36
19
17
13
30
28
31
26
3
23
21
8
7
4
10
14
1
11
9
12
40
2
6
41
5
38
37
39
— 12 —
PARTS LIST
CTK-671
Notes: This parts list does not include the cosmetic parts, which
parts are marked with item No. "R-X" in the exploded
view.
Contact our spare parts department if you need these
parts for refurbish.
1. Prices and specifications are subject to change without prior notice.
2. As for spare parts order and supply, refer to the
"GUIDEBOOK for Spare parts Supply", published
seperately.
3. The numbers in item column correspond to the same
numbers in drawing.
PARTS PRICE LIST
AA B
AF A
AF A
AD A
AH A
AC A
AD B
AI B
Q312-314
AC A
CY B
AC A
AA B
Notes:N- New parts
Q- Quantity used per unit
R- Rank
- 13 -
CTK-671
N ITEM CODE NO. PART NAME SPECIFICATION Q PRICE CODE R
MAIN PCB
1 1005 9366 PCB ASSY(MA1M) TK-M241620*1(M703) 1 EC A
D1-D4 6930 4610 DIODE DA227 4
FL2 3025 1862 FILTER/EMI NFM51R00P206 1 AC B
IC1 2105 4158 IC/MOS TA75S393F(TE85L) 1 AC A
IC11 6931 0466 IC/MOS XC6203E332PR 1
IC12 6930 9999 IC/L-MOS TC7WH123FK(TE85L) 1
IC13 6930 9995 IC/L-MOS TC7SZ08FU(TE85L) 1
IC2 7911 3782 IC/MOS RN5VD27AA-TR 1 AC A
IC3 2105 4746 LSI UPD6379GR-E1 1 AO A
IC4,IC5 2105 6576 IC/C-MOS TC74LCX245FT(EL) 2 AF A
IC6 6930 9980 IC/C-MOS TC74VCX00FT(EL) 1
IC7-IC9 6930 9981 IC/C-MOS TC74VHCT08AF (EL) 3
LSI1 1005 4502 LSI UPD914AGM-3ED 1 CK A
LSI2 2012 5987 LSI TC190C020AF-001 1 BC A
LSI3 1005 3636 LSI MR27V3202E-86MA-N 1 BT A
LSI4 1005 3638 LSI UPD43256BGU-A85-E2 1 AW A
LSI5 1005 3639 LSI D441000LGZB70XKJE4 1 BJ A
Q1 6930 0298 TRANSISTOR 2SC4081T106R 1
X1 1005 9360 OSCILLATOR/CRYSTAL SMD-49-16.384M 1
SUB PCB ASSY
2 1005 9365 PCB ASSY(MA2M) TK-M241622*1(M703) 1 CV B
D301,D302 2390 3021 DIODE SRT14 2 AF B
D303-D305,D310 2315 3132 DIODE 1SS133T-77 4 AA B
D306 2360 0644 DIODE/ZENER HZS5BLLTD 1 AA B
D307 2360 3084 DIODE/ZENER HZS5.6NB3TD 1 AA B
IC301 1004 3474 IC/MONOLITHIC LA4635A 1 AN A
IC302 2114 1421 IC/PHOTO COUPLER PC900V 1 AK B
IC304 2121 0072 IC/MONOLITHIC NJM2068DD 1 AD A
J301 3501 7049 JACK/DC HEC2305-01-330 1 AC A
J302 3612 0665 JACK/PHONE YKB21-5006 1 AG B
J303 3612 0789 JACK YKB21-5010 1 AC B
J304 3501 4816 JACK/DIN YKF51-5051 1 AH B
Q301 2251 0672 TRANSISTOR 2SB1548-P.CS 1 AD A
Q303 2250 1591 TRANSISTOR 2SB1237TV2R 1 AB A
Q304,Q308,Q309,
2250 1592 TRANSISTOR 2SC1740STPR 6 AA A
Q305 6930 0356 TRANSISTOR 2SD1862TV2R 1
DISPLAY PCB
3 1006 4963 PCB ASSY(LCD1M) TK-M241650*1(M703) 1
IC502,IC503 6930 9991 IC/L-MOS TC7SET08FU(TE85L) 2
LSI501 1000 6502 LSI ML9040-B02GA 1 AU A
CONSOLE PCB
4 1005 9367 PCB ASSY(CN1,2) TK-M241624*1(M703) 1 BY B
D401 6930 4806 LED EL-204HD/TR2-1(A) 1
VR401 2765 2213 VOLULME RS20H121-2KB 1 AD A
KEYBOARD PCB
5 1002 5799 PCB ASSY(KY1M) TK-M140687*7(M474) 1 BV B
6 1005 9370 PCB/ASSY(KY2M) TK-M140688*10(M703) 1 BJ B
D501~D564 2301 0101 DIODE 1S2473-T-77-T 64 AA B
D565~D622 2301 0101 DIODE 1S2473-T-77-T 58 AA B
N ITEM CODE NO. PART NAME SPECIFICATION Q PRICE CODE R
AP A
AF B
CZ B
AA X
AA X
AA C
AO B
AD B
CN X
AW X
Notes:N- New parts
Q- Quantity used per unit
R- Rank
- 14 -
KEYBOARD UNIT
7 6922 2721 WHITE KEY SET/LT M312118A*1 4 AP A
8 6922 2731 WHITE KEY SET/LT M312118A*2 1
9 6906 8482 BLACK KEY SET 10P M140369B-3 2 AM A
10 6906 8592 BLACK KEY SET 5P M140369B-4 1 AI A
11 6922 2762 RUBBER/KEY M211704B-1 4 AF B
12 6922 2772 RUBBER/KEY M211705B-1 1
PANEL UNIT
13 1005 3647 LCD CG1902-TTP 1 BM B
14 1005 9358 SPEAKER 12K60SHA9225C 2 AT B
15 1004 7853 RUBBER/BUTTON M341423-1 1 AA B
16 1004 7854 RUBBER/BUTTON M241550-1 1 AA B
17 1004 7855 RUBBER/BUTTON M241543-1 1 AD B
18 1004 7856 RUBBER/BUTTON M241544-1 1 AD B
19 1004 7857 RUBBER/BUTTON M241545-1 1 AD B
20 1004 7858 RUBBER/BUTTON M241546-1 1 AD B
21 1004 7859 RUBBER/BUTTON M241547-1 1 AC B
22 1004 7860 RUBBER/BUTTON M241548-1 1 AB B
23 1004 7861 RUBBER/BUTTON M241549-1 1 AD B
24 1005 9359 CASE SUB ASSY/UPPER M241619*1 1
25 6927 0510 CONTACT/SL CSB-08D 1 AD C
26 1002 7158 CONNECTOR M441141-1 2 AI C
27 6930 7200 PIECE/TOP 476-L M441142A-1 1
28 6930 7201 PIECE/TOP 476-R M441143A-1 1
29 6930 7202 FILM M441144A-1 1
30 1003 7738 SPONGE M441167-1 2 AA C
31 1003 0993 PLATE/BL M341362-1 1 AT C
32 1005 3931 PANEL/DISPLAY M141171-1 1 AQ C
33 6922 4480 DUMPER/KEY M412324-1 1 AE C
34 6921 5030 KNOB/SLIDE M311859-1 2 AA B
35 1006 2649 REFLECTOR M241321A-2 1
36 1003 7737 FACE/D M441174-1 1 AA X
D506,D509 1003 2149 LED FY4067S-2C1-B170 2
COMPONENT
37 1005 9361 CASE SUB ASSY/MUSIC M141274*1 1
38 6906 9252 PLATE/LOWER M240573B-2 1 AS X
39 1003 7742 BATTERY COVER SUB ASSY M341235*3(M476) 1 CF B
40 6903 2150 SPRING/BATTERY(+) M41330-1 1 AA X
41 6902 6141 SPRING/BATTERY(-) M41226A-1 1 AB X
6928 5280 STAND ASSY/MUSIC M340769*2 TK 1
CASIO TECHNO CO.,LTD.
Ver.1 : Correction of all contents except exploded view and parts list.
Because Service Manual for CTK-671 in Vol.CB-15 contains
totaly wrong information.
Overseas Service Division
Nishi-Shinjuku Kimuraya Bldg. 1F
5-25, Nishi-Shinjuku 7-Chome
Shinjuku-ku, Tokyo 160-0023, Japan
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