Casio CTK-900 User manual

ELECTRONIC KEYBOARD
CTK-900
MAY. 2005
CTK-900
Ver.2: Nov. 2007
INDEX

CONTENTS
Specifications ---------------------------------------------------------------------------------------------- 1
Block Diagram --------------------------------------------------------------------------------------------- 3
Circuit Description --------------------------------------------------------------------------------------- 4
Printed Circuit Board ------------------------------------------------------------------------------------ 5
Disassembly ------------------------------------------------------------------------------------------------ 8
Diagnostic Program------------------------------------------------------------------------------------ 15
Exploded View ------------------------------------------------------------------------------------------- 18
Parts List--------------------------------------------------------------------------------------------------- 19
Schematic Diagrams----------------------------------------------------------------------------------- 22

— 1 —
SPECIFICATIONS
GENERAL
Keyboard: 61 standard-size keys, 5 octaves with touch response (Off / 1 / 2 / 3)
Tones: 332 Advanced Tones + 200 Preset Tones + 18 Drum Sets + 100 standard user tones
+ 20 user tones with waves* + 4 user drum sets with waves* + 50 drawbar organ
tones + 100 user drawbar organ tones (824 tones total); layer/split
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: 176 (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 Name Composer Play Time
0 Street Beatz Steve Turner 2:10
1 Wind from the South Hage Software 2:30
2 Serendipity Waltz TECH-NOTE INTERNATIONAL LTD. 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: 4MB (SharedArea:Approximately 3.5MB (waveform data, accompaniment data, SMF
data))
• Further storage of waveform, accompaniment, and SMF data becomes impossible
after the total of such data reaches approximately 3.5MB.
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:
Consumption Current 1200 mA ±20 %
Consumption Current at idle 260 mA ±20 %
with 16 keys from C1 to D#2 pressed in 479 OcarinaG
Volume: maximum, Velocity: maximum
Speaker output level (Vrms with 8 Ωload each channel):
with key E1 in 479 OcarinaG
Volume: maximun, Velocity: maximum R Channel: 3900 mV ±20 %
L Channel: 4200 mV ±20 %
Phone output level (Vrms with 32 Ωload each channel):
with key E1 in 479 OcarinaG
Volume: maximun, Velocity: maximum R Channel: 430 mV ±20 %
L Channel: 470 mV ±20 %
Output level (Vrms with 47 Ωload each channel):
with key E1 in 479 OcarinaG
Volume: maximun, Velocity: maximum R Channel: 2200 mV ±20 %
L Channel: 2400 mV ±20 %

— 3 —
BLOCK DIAGRAM
RAM (1Mbit)
IC2
CY62128VLL-70AZI
Reset IC
IC4
R1151N001C-TR RESET
16.384MHz
EA0 ~ EA15,EA18
ED12 ~ ED19
MA0 ~ MA20
MD0 ~ MD15
CONT
Speakers
(L)
(R)
Phones/Output
Filter
IC202, IC203
DAC IC3
µPD6379LGR-E1
Power Amplifier
IC201
LA4636
LOUT ROUT
ROM (128Mbit)
IC8
MR27V12800J137TN3D
RAM (1Mbit)
IC12
CY62128VLL-70AZI
MD0 ~ MD15
MA0 ~ MA15, MA25
MA0 ~ MA23, MA25
MD0 ~ MD7
MA1 ~ MA3
MD0 ~ MD15
KEY/BOTTON
CONTROLLER
IC13
TC190C020AF-001
KC0 ~ KC7
SI0 ~ SI7
FI0 ~ FI7
Keyboard
MIDI
PEDAL
Assingnable Jack
Q207
D209
IN
OUT
LCD Controller
ML9040-B02GA (IC501)
Power Supply Circuit
Q201 ~ Q205, D201,
D204, D205
(9V)
VC
(5V)
VD5
(5V)
VA5
(9V)
VCP
APO
ADIN
Battery
APO Cancellation
AC Adaptor
DC 9V D201
MA0 ~ MA21
Main
Volume
CONSOLE PCB
(M705-CN2M)
Keyboard PCB
(CSM618T-KY1M/KY2M)
CONSOLE PCB (M705-CN1M)
SUB PCB (M707-MA2)
MAIN PCB (M707-MD1)
LCD PCB
(M705-LCD1M)
MPU
IC10
uPD914AGM-3ED
NMI, KI0 ~ KI2, FI8 ~ FI0, KC0 ~ KC7
LD14 ~ LD16, LD20 ~ LD22
Buttons

— 4 —
CIRCUIT DESCRIPTION
KEY MATRIX
BUTTON MATRIX
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 컅
CURSOR 왕
TONE
KC3
CURSOR 왓
EXIT
CURSOR 컄
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
KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7
FI0 C2 1C#2 1D2 1D#2 1E2 1F2 1F#2 1G2 1
SI0 C2 2C#2 2D2 2D#2 2E2 2F2 2F#2 2G2 2
FI1 G#2 1A2 1A#2 1B2 1C3 1C#3 1D3 1D#3 1
SI1 G#2 2A2 2A#2 2B2 2C3 2C#3 2D3 2D#3 2
FI2 E3 1F3 1F#3 1G3 1G#3 1A3 1A#3 1B3 1
SI2 E3 2F3 2F#3 2G3 2G#3 2A3 2A#3 2B3 2
FI3 C4 1C#4 1D4 1D#4 1E4 1F4 1F#4 1G4 1
SI3 C4 2C#4 2D4 2D#4 2E4 2F4 2F#4 2G4 2
FI4 G#4 1A4 1A#4 1B4 1C5 1C#5 1D5 1D#5 1
SI4 G#4 2A4 2A#4 2B4 2C5 2C#5 2D5 2D#5 2
FI5 E5 1F5 1F#5 1G5 1G#5 1A5 1A#5 1B5 1
SI5 E5 2F5 2F#5 2G5 2G#5 2A5 2A#5 2B5 2
FI6 C6 1C#6 1D6 1D#6 1E6 1F6 1F#6 1G6 1
SI6 C6 2C#6 2D6 2D#6 2E6 2F6 2F#6 2G6 2
FI7 G#6 1A6 1A#6 1B6 1C7 1
SI7 G#6 2A6 2A#6 2B6 2C7 2

— 5 —
PRINTED CIRCUIT BOARDS
MAIN PCB M707-MD1
Bottom View
Top View

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

— 7 —
CONSOLE PCB M705-CN1M
Top View
CONSOLE PCB M705-CN2M CONSOLE PCB M705-CN3M CONSOLE PCB M705-CN4M
Top View
Top View
Top View

— 8 —
DISASSEMBLY
1. Remove the battery cover and then battery.
2. Remove 27 screws and then upper case.
1
3
2
■To remove the main PCB (M707-MD1).
3. Remove six screws on the PCB (M707-MD1).
4. Remove six connectors by soldering.
5. Remove the PCB (M707-MD1).
Connector (JA)
Connector (JF)
Connector (JE)
Connector (JD)
Connector (JC)
Connector (JB)

— 9 —
PCB (M705-CN1M)M705-CN2M PCB
PCB (M705-CN3M)PCB (M705-LCD1M)
PCB (M705-CN1M)
PCB (M705-MA2M) PCB (M705-MA1M)
PCB (M705-MA1M)
JD(14pin)
JD(14pin)
JC(12pin)
JC(12pin)
JA(16pin)
JA(16pin) JB(17pin)
JB(17pin)
JE(10pin)
JF(12pin)
JE(10pin)
JF(12pin)
■Precaution while assembling the main PCB (M707-MD1).
Refer to the illustration below because many cables appear.

— 10 —
■To remove the sub PCB (M705-MA2M).
6. Remove five screws on the PCB (M705-MA2M).
7. Remove three connectors on the PCB (M705-MA2M) by soldering.
8. Remove six lead wires on the PCB (M705-MA2M) by soldering.
9. Remove the PCB (M705-MA2M).
Connector (JB)
Connector (JB)
Connector (JB)
Speaker cord (orange)
Speaker cord (white)
Speaker cord (white)
Speaker cord (blue)
Battery cord (red)
Battery cord (black)
12
3
4
5
6
■To remove LCD PCB (M705-LCD1M).
10. Remove six screws on the PCB ( M705-LCD1M).
Note: Tighten screws in order 1 to 6 as the figure shown below while reassembling.

— 11 —
■To remove the console PCB (M705-CN1M, CN2M, CN3M).
11. Remove three screws on the PCB (M705-CN3M).
12. Remove the connector on the PCB (M705-CN3M) by soldering.
13. Remove the PCB (M705-CN3M).
14. Remove two screws on the PCB (M705-CN2M).
15. Remove the volume knob.
16. Remove the PCB (M705-CN2M).
17. Remove 22 screws and then the PCB (M705-CN1M).
Connector (JL2)
Volume knob

— 12 —
■D301, D302 ■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
Anode
Cathode
D301 D302
D303
D304
D305
D306
D307
■To replace LED.
Note: Fix the LED (D301, D302, D303, D304, D305, D306) 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.
Note: Mount LED on the PCB. (solder side).
Correct polarity and height as follows.
■To remove the speaker.
18. Remove 8 screws and then two speakers.
Note: Fix speaker cords securely.

— 13 —
■To remove the key PCB (CSM618T-KY1M, KY2M)
19. Remove 13 screws and the bottom case.
Projection
Note: Tighten the screw with the arrow mark in the figure first when reassembling.
20. Remove 19 screws and then the key PCB (CSM618T-KY1M, KY2M).
21. 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.

—14 —
Note: Pay attention to the positions of the screw
holes when reassembling.
23. Remove the black keys.
22. Remove 22 screws and then the white keys.

— 15 —
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 “008 BritePno” appears, release the “Cursor key UP” and “Cursor key Down” buttons.
“TEST 707” 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 1“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 1
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
BritePno
1
2
DRAWBAR
DSP
PIANO
UP
RIGHT
DOWN
LEFT
EXIT
HARMO
SPLIT
LAYER
0
[0 button
\1 button
]4 button
`7 button
a8 button
b5 button
c2 button
d- button
e+ button
f3 button
g6 button
h9 button
iDEMO
1
4
7
8
5
2
-
+
3
6
9
DEMO
SW OK
2 3 4
5 6 7 8 9 0 A B D E F G H I
P
Q
R
T
U
WVX
Y
Z [ \ ]
^
a
b
f
e
d
c
g
h
i
j
k
K
L M
N O
1S

—16 —
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 after about a few seconds.
7. Flash memory bus check
1Press “INTRO/ENDING2”button.
2OK sound must be audible after about a few seconds.
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 CHORD
b. FINGERED
c. CASIO CHORD
d. DATAACCESS
e. DRAWBAR ORGAN
f . DSP
Message on LCD
1ACJ ON
1SUS CHK
1SUS ON
1US OFF
1VOLT HI
4ROM CHK
앗
1ROM OK
1FMB CHK
앗
1FMB OK
1MIDI OK
1DRAM OK
1CRAM OK
1LED CHK
앗
앗
앗
앗
앗
앗
앗
1LED END

—17 —
11. LCD check
1Press “TEMPO쑿”button.
2Turn on all segments of the LCD.
3Press “BANK”button.
4The area 1turns as check pattern.
5Press “REGISTRATION 1”button.
6The area 1turns as check pattern.
7Press “REGISTRATION 2”button.
8Half of characters in all areas turn on.
9Press “REGISTRATION 3”button.
=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.

– 18 –
37
17
38
38
25
18
20 19
33
34
35
32
26
21
28
23
22
24
27
31
3
15
8
13
14
7
2
1
54
R-1 Stick the rating label (Parts No:10199409)
R-3
30
29
R-2
36
6
11
12
9
10
16
EXPLODED VIEW