Casio CTK-691 User manual

ELECTRONIC KEYBOARD
CTK-691
CTK-691
JUN. 2003
Ver.2: Sep. 2006

CONTENTS
Page
Specifications ............................................................................................................................................ 1
Block Diagram ........................................................................................................................................... 3
Circuit Description ..................................................................................................................................... 4
Printed Circuit Boards ............................................................................................................................... 5
Disassembly .............................................................................................................................................. 8
Diagnostic Program................................................................................................................................. 14
Schematic Diagrams ............................................................................................................................... 17
Exploded View ........................................................................................................................................ 22
Parts List ................................................................................................................................................. 23

— 1 —
SPECIFICATIONS
GENERAL
Keyboard: 61 standard-size keys, 5 octaves with touch response (Off / 1 / 2 / 3)
Tones: 300 Advanced Tones + 200 Preset Tones + 16 Drum Sets + 100 standard
user tones + 20 user tones with waves*: + 4 drum sets with waves* + 50
drawbar organ tones + 100 user drawbar organ tones (790 tones total);
layer/split
Rhythm Instrument Tones: 61
Polyphony: 32 notes maximum (10 for certain tones)
Effects: DSP (200 types: internal, 100 user areas) + Reverb (16 types) + Chorus (16
types) + Equalizer (10 types, 4 bands)
Auto Accompaniment
Rhythm Patterns: 156 (internal, 16 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: 10 types: Automatic addition of notes that harmonize with melody note in
accordance with specified Auto Accompaniment chords.
Memory Function
Songs: 5
Recording Tracks: 6 (2 through 6 are melody tracks)
Recording Methods: Real-time, step
Memory Capacity: Approximately 10,000 notes (total for 5 songs)
Edit Function: Equipped
Demo Tunes: 3
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, DSP level.
Registration Memory
Number of Setups: 32 (4 setups ×8 banks)
Memory Contents: Tone, Rhythm, Tempo, Layer on/off, Split on/off, Split point, Harmonize on/
off, Mixer settings (Channels 1 to 10), Effect settings, Touch Response
settings, Assignable jack setting, Transpose, Tuning, Accompaniment
volume setting, Auto Harmonize type, MODE button setting, Synchro
standby state, Mixer Hold, DSP Hold, Synthesizer Mode parameters
Mixer Function
Channels: 16
Parameters: Tone; part on/off; volume; pan pot; octave shift; coarse tune; fine tune;
reverb send; chorus send; DSP line; DSP level; DSP pan; DSP system
reverb send; DSP system chorus send
MIDI: 16 multi-timbre receive, GM Level 1 standard
Tune Number
0
1
2
Name
Nora Park
Garage Flava
Strut With Beauty
Composer
TECH-NOTE INTERNATIONAL LTD.
Steave Turner
Edward Alstrom
Play time
2:06
2:15
1:52

— 2 —
Other Functions
Transpose: 49 steps (–24 semitones to +24 semitones)
Tuning: Variable (A4 = approximately 440Hz ±100 cents)
LCD: Adjustable contrast
SMF Player Flash memory storage for up to 200 files*
• Supported Format: SMF0
Flash Memory Capacity: 2MB
Shared Area: Approximately 1.5MB (waveform data, accompaniment data,
SMF data)
• Further storage of waveform, accompaniment, and SMF data becomes
impossible after the total of such data reaches approximately 1.5MB.
Terminals
MIDI Terminals: IN, OUT
Sustain/Assignable Terminal:Standard jack (sustain, sostenuto, soft, rhythm start/stop)
Headphone/Output Terminal: Stereo standard jack
Output Impedance: 140Ω
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: 3W + 3W
Power consumption: 9V 7.7W
Dimensions: 96.0 ×37.5 ×14.6 cm (37 13/16 ×14 3/4×5 3/4inch)
Weight: Approximately 5.6 kg (12.3lbs) (without batteries)
* The same memory area is used to store waveform data, accompaniment data, and SMF data.
ELECTRICAL
Current drain with 9 V DC:
No sound output 1200 mA ±20 %
Maximum volume 260 mA ±20 %
with 16 keys from C1 to D#2 pressed in 193 BREATHY ALTO SAX (R channel)
Volume: maximum, Velocity: maximum
Speaker output level (Vrms with 4 Ωload each channel):
with key G1 in 193 BREATHY ALTO SAX (R channel)
Volume: maximun, Velocity: maximum L/R: 3700 mV ±20 %
Phone output level (Vrms with 32 Ωload each channel):
with key, E1 in 193 BREATHY ALTO SAX (R channel)
Volume: maximun, Velocity: maximum L/R: 320 mV ±20 %
Output level (Vrms with 47 Ωload each channel):
with key E1 in 193 BREATHY ALTO SAX (R channel)
Volume: maximun, Velocity: maximum L/R: 1750 mV ±20 %
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 —
BLOCK DIAGRAM
MIDI
RAM (1Mbit)
IC2
CY62128VLL-70AZI
PEDAL
Assingnable Jack
Reset IC
IC4
R1151N001C-TR
RESET
16.384MHz
EA0 ~ EA19
ED12 ~ ED19
MA0 ~ MA20
MD0 ~ MD15
Q207
D209
Filter
IC202, IC203
DAC IC3
µPD6379LGR-E1
Main
Volume
Power Amplifier
IC201
LA4636
Power Supply Circuit
Q201 ~ Q206, D201,
D204, D205, D207, D208
(9V)
VC
(5V)
VD5
(5V)
VA5
(9V)
VCP
APO
ADIN Battery
APO Cancellation
Speakers
(L)
(R)
Phones/Output
LOUT
CONT ROUT
AC Adaptor
DC 9V
Keyboard
Buttons
FLASH ROM (16MBit)
IC5
LH28F160BJHE-BTL90
RAM (1Mbit)
IC12
CY62128VLL-70AZI
ROM (64Mbit)
IC8
MR27V6402G01BTNZ04
MA0 ~ MA21
MD0 ~ MD15
MD0 ~ MD15
MA0 ~ MA15, MA25
MA0 ~ MA23, MA25
MD0 ~ MD7
MA1 ~ MA3
MD0 ~ MD15
CPU
IC10
uPD914AGM-3ED
KEY/BOTTON
CONTROLLER
IC13
TC190C020AF-001
KC0 ~ KC7
SI0 ~ SI7
FI0 ~ FI7
FI8 ~ FI10, FI0 ~ FI7, KI0 ~ KI2,
LD14 ~ LD16, LD20 ~ LD22
LCD Controller
ML9040-B02GA (IC501)
IN
OUT
D203
MA0 ~ MA20

—4 —
CIRCUIT DESCRIPTION
KEY MATRIX
BUTTON MATRIX
KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7-
C2 (1) C#2(1) D2 (1) D#2 (1) E2 (1) F2 (1) F#2 (1) G2 (1)
C2 (2) C#2 (2) D2 (2) D#2 (2) E2 (2) F2 (2) F#2 (2) G2 (2)
G#2 (1) A2 (1) A#2 (1) B2 (1) C3 (1) C#3 (1) D3 (1) D#3 (1)
G#2 (2) A2 (2) A#2 (2) B2 (2) C3 (2) C#3 (2) D3 (2) D#3 (2)
E3 (1) F3 (1) F#3 (1) G3 (1) G#3 (1) A3 (1) A#3 (1) B3 (1)
E3 (2) F3 (2) F#3 (2) G3 (2) G#3 (2) A3 (2) A#3 (2) B3 (2)
C4 (1) C#4 (1) D4 (1) D#4 (1) E4 (1) F4 (1) F#4 (1) G4 (1)
C4 (2) C#4 (2) D4 (2) D#4 (2) E4 (2) F4 (2) F#4 (2) G4 (2)
G#4 (1) A4 (1) A#4 (1) B4 (1) C5 (1) C#5 (1) D5 (1) D#5 (1)
G#4 (2) A4 (2) A#4 (2) B4 (2) C5 (2) C#5 (2) D5 (2) D#5 (2)
E5 (1) F5 (1) F#5 (1) G5 (1) G#5 (1) A5 (1) A#5 (1) B5 (1)
E5 (2) F5 (2) F#5 (2) G5 (2) G#5 (2) A5 (2) A#5 (2) B5 (2)
C6 (1) C#6 (1) D6 (1) D#6 (1) E6 (1) F6 (1) F#6 (1) G6 (1)
C6 (2) C#6 (2) D6 (2) D#6 (2) E6 (2) F6 (2) F#6 (2) G6 (2)
G#6 (1) A6 (1) A#6 (1) B6 (1) C7 (1)
G#6 (2) A6 (2) A#6 (2) B6 (2) C7 (2)
FI0
SI0
FI1
SI1
FI2
SI2
FI3
SI3
FI4
SI4
FI5
SI5
FI6
SI6
FI7
SI7
KC4
PART EDIT
TONE EDIT
SETTING
TEMPO UP
BANK
EFFECT EDIT
KC5
SEQ
ACCOMP VOLUME
ONE TOUCH PRESET
REGISTRATION 1
TEMPO DOWN
SMF PLAY
KI0
KI1
KI2
FI8
FI9
FI10
KC2
DSP ON/OFF
PIANO SETTING
RHYTHM
CURSOR⇐
CURSOR⇑
TONE
KC3
CURSOR⇓
EXIT
CURSOR⇒
7
4
DRAWBAR
KC0
9
6
3
+
LAYER
DEMO
KC1
8
0
1
2
—
5
KC6
STORE
INTRO/ENDING 2
INTRO/ENDING 1
SPLIT
AUTO HARMONIZE
START/STOP
KC7
SYNCRO/FILL-IN NEXT
VARIATION/FILL-IN 2
VARIATION/FILL-IN 1
REGISTRATION 4
REGISTRATION 3
REGISTRATION 2

— 5 —
PRINTED CIRCUIT BOARDS
Main PCB M705-MA1M
Top View
Bottom View

— 6 —
Sub PCB M705-MA2M
LCD PCB M705-LCD1M
Top View
Top View

— 7 —
CONSOLE PCB M705-CN2M
Top View
CONSOLE PCB M705-CN1M
Top View
CONSOLE PCB M705-CN4MCONSOLE PCB M705-CN3M
Top View
Top View

— 8 —
DISASSEMBLY
1. Remove the battery cover and then the battery.
2. Remove 27 screws and then the upper case.
3. Remove 5 screws, 4 speaker cords, 2 battery cords, 3 connectors (JC, JG, JH) and then the PCB ASS'Y
(MA2M).
Speaker cord (BL)
Speaker cord (W)
Speaker cord (O)
Speaker cord (W)
Battery cord (R)
Battery cord (B)
Screws
Connectors

— 9 —
4. Remove 4 screws, 6 connectors (JA, JB, JC, JD, JE, JF) and then the PCB ASS'Y (MA1M).
5. Remove 6 screws and then the LCD ASS'Y (LCD1M).
Note: Tighten the screws in the order from 1 to 6 when reassembling.
12
3
4
5
6
Screws
Screws
Screws
Connectors
Connectors
Connectors
Note: How to attach a HEAT-SINK
Insert aTRANSISTOR into the PWB after attaching a HEAT-
SINK to the TRANSISTOR.
Be soldering sfter that.
HEAT-SINK
TRANSISTOR

— 10 —
Screws
6. Remove 3 screws, connector (JL), and then the PCB ASS'Y (CN3M).
Connector
7. Remove 2 screws, the volume knob, and then the PCB ASS'Y (CN2M).
Volume knob Screws
8. Remove 22 screws and then the PCB ASSY (CN1M).

— 11 —
Note: Fix the LED (D301, D302, D303, D304, D305, D306, D307) to the PCB according to the height as shown in
the figure below while paying attention to the polarity.
Refer to the illustration on the PCB for the details of the polarity.
Anode
Cathode
D301 D302 D306
D303
D305
■ D301, D302
D307
9. Remove 13 screws and then the lower case.
Note: Tighten the screw with the arrow mark in the figure first when reassembling.
Cushion
D304
Note: Mount LED on the PCB. (solder side)
Correct polarity and height as follows.
■ D303, D304
15.0 ± 0.5 mm
SOLDER SIDE
COMPONENT SIDE
14.5 ± 0.5 mm
SOLDER SIDE
COMPONENT SIDE
■ D305 ■ D306, D307
12.5 ± 0.5 mm
SOLDER SIDE
COMPONENT SIDE
6.8 ± 0.5 mm
SOLDER SIDE
COMPONENT SIDE

— 12 —
10.Remove 19 screws and then the PCB ASSY (KY1M, KY2M).
11.Remove the rubber keys.
Note: Pay attention to the positions of the rubber keys as one of them has a different length.
Match the projections of the rubber keys with the holes of the lower case when reassembling.
Projection

— 13 —
12.Remove 21 screws and then the white keys.
13.Remove the black keys.
Note: Pay attention to the positions of the screw holes when
reassembling.

— 14 —
ORHYTHM
P
DRAWBAR ORGAN
QDSP
RPIANO SETTING
SCursor key Up
TCursor key Right
UCursor key Down
VCursor key Left
WEXIT
X
AUTO HARMONIZE
YSPLIT
ZLAYER
■Initial Setup
1. Connect an AC adaptor.
2. Connect a Sustain pedal.
3. "Main" volume: MAX.
NOTE: If there is no pedal or MIDI cable, pedal or MIDI check can be skipped.
■How to start diagnostic program
1. Press the “POWER” button while pressing the “Cursor key Up” and “Cursor key Down” buttons.
2. Release the “POWER” button first while still pressing the “Cursor key UP” and “Cursor key Down”
buttons. After “000 Sy.Gr Pno” appears, release the “Cursor key UP” and “Cursor key Down”
buttons. “TEST 705” appears on the LCD.
NOTE: Refer to the figure below for the LCD messages that appear during the diagnostic program.
1MODE
2
ONE TOUCH PRESET
3ACCOMP VOLUME
4INTRO/ENDING 1
5INTRO/ENDING 2
6
VARIATION/FILL-IN 1
7 VARIATION/FILL-IN 2
8 SYNCHRO/FILL-IN NEXT
9START/STOP
@TEMPO쑼
ATEMPO쑿
BBANK
CREGISTRATION 1
DREGISTRATION 2
EREGISTRATION 3
FREGISTRATION 4
GSTORE
H
TRANSPOSE/FUNCTION
IMIXER
SYNTH
KEFFECT
LSONG MEMORY
MSMF PLAYER
NTONE
DIAGNOSTIC PROGRAM
■Diagnostic program
1. Button check
1Press “DSP” button. Display indicates 3“MODE”.
2Press buttons in the following order.
NOTE: NG sound sounds when a button is defective or buttons are pressed in a wrong order.
LCD message appears in the area 3
OTP
ACMP VOL
INT/END1
INT/END2
VAR/FIL 1
VAR/FIL 2
SYNCHRO
STRT/STP
TEMPO/DW
TEMPO/UP
BANK
REGIST 1
REGIST 2
REGIST 3
REGIST 4
STORE
TRN/FUNC
MIXER
SYNTH
EFFECT
SONG
SMF
TONE
RHYTHM
Message on LCD Message on LCD Message on LCD Message on LCD
12 3 456
7890ABCD
DRAWBAR
DSP
PIANO
UP
RIGHT
DOWN
LEFT
EXIT
HARMO
SPLIT
LAYER
0
[0 buttons
\1 buttons
]4 buttons
`7 buttons
a8 buttons
b5 buttons
c2 buttons
d- buttons
e+ buttons
f3 buttons
g6 buttons
h9 buttons
iDEMO
1
4
7
8
5
2
-
+
3
6
9
DEMO
SW OK
[
\
]
^T
U
S
V
W
ZYX
GFEDCB
A0
987654
123
H
L
I
K
Mi
Q
N
O
P
R
d
c
b
a
e
f
g
h

— 15 —
2. AC adaptor detection check.
1Press “TONE” button.
2 When the instrument detects that an AC adaptor is plugged in, an OK sound
sounds. “ACJ OFF” appears and an NG sound sounds when the AC adaptor
is not plugged (when batteries are used).
3. Sustain jack check. (If no pedal, this check can be skipped)
1Press “RHYTHM” button.
2Press “Sustain pedal” .
3Release “Sustain pedal” .
4NG sound, “OFF” sound this case, must be audible.
4. Low Voltage detection check.
1Press “DRAWBAR ORGAN” button.
2OK sound must be audible.
5. MIDI IN/OUT check (If there is no MIDI cable, this check can be skipped)
1Connect MIDI IN and MIDI OUT terminals with a MIDI cable.
2Press “3” button.
3Disconnect the MIDI cable.
6. ROM check
1Press “INTRO/ENDING1” button.
2OK sound must be audible.
7. Flash memory bus check
1Press “INTRO/ENDING2” button.
2OK sound must be audible.
8. DSP RAM check
1Press “VARIATION/FILL-IN 2” button
9. CPU RAM check
1Press “SYNCHRO/FILL-IN NEXT” button.
10. LED check
1Press “TEMPO쑼” button.
2LEDs illuminate in the following order.
a . FULL RANGE
b . FINGERED
c . CASIO CHORD
d . DATA ACCESS
e . DRAWBAR ORGAN
f . DSP
11. LCD check
1Press “TEMPO쑿” button.
2Turn on all segments of the LCD.
3Press “BANK” button.
4The area 3turns as check pattern.
5Press “REGISTRATION 1” button.
6The area 3turns as check pattern.
7Press “REGISTRATION 2” button.
8Half of characters in area 1to Dturn on.
9Press “REGISTRATION 3” button.
Message on LCD
3ACJ ON
3SUS CHK
3SUS ON
3US OFF
3VOLT HI
4ROM CHK
앗
3ROM OK
3FMB CHK
앗
3FMB OK
3MIDI OK
3DRAM OK
3CRAM OK
3LED CHK
앗
앗
앗
앗
앗
앗
앗
3LED END
Except area 3
Except area 3

— 16 —
=Rest of above characters turn on.
APress “REGISTRATION 4” button.
BEach characters turn in order.
There no lack of dots and characters
12. TUNE check (If no TUNING METER, this check can be skipped)
1Connect the TUNING METER to the phone jack.
2Press “8” button.
3The TUNING METER must indicate "C".
4Disconnect the TUNING METER from the phone jack.
13. APO check
1Press “EXIT” button.
* Go out from TEST mode (Power off).
* The keybord turns off after about 2 seconds.
* The LCD turns off.
DIAGNOSTIC PROGRAM IS FINISHED.

— 17 —
SCHEMATIC DIAGRAMS
Main PCB M705-MA1M

— 18 —
Sub PCB M705-MA2M