Casio WK-240 Installation and maintenance instructions

WK-240
JUN. 2014
Ver. 1 : Jul. 2014

WK-240
CONTENTS
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
BLOCK AND WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PCB INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CIRCUIT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
PRINTED CIRCUIT BOARDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
DIAGNOSTIC PROGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

WK-240
– 1 –
SPECIFICATIONS
Keyboard
Touch Response
76 standard size keys
2 types, Off
Maximum Polyphony 48 notes (24 for certain tones)
Tones
Built-in Tones
Sampling Tones
Functions
600
Up to 8 (Melody Sampling: 5, Drum Sampling: 3)*
Up to 10 seconds
Layer, Split, Piano/Organ button
Virtual Hall On, Off
Reverb 1 to 10, Off
Chorus 1 to 5, Off
Metronome
Beats per Measure
Tempo Range
0 to 9
30 to 255
Song Bank
Built-in Songs
User Songs
152
Up to 10*
Step Up Lesson
Lessons
Lesson Part
Functions
4 (Listen, Watch, Remember, Auto)
L, R, LR
Repeat, Voice Fingering Guide, Note Guide,
Performance Evaluation
Music Challenge 20 notes
Auto Accompaniment
Built-in Rhythms
User Rhythms
180
Up to 10 (Accompaniment Edit)*
Chord Book Function Chord guide
Registration 32 (4 setups × 8 banks)
Recorder
Keyboard Play
Playing Along with a
Built-in Songs
Memory Capacity
Real-time recording, playback
5 songs, 6 tracks
1 song (L, R, LR)
Approximately 12,000 notes (total for 6 songs)
Other Functions
Transpose
Octave Shift
Tuning
Preset Scales
Music Preset
One Touch Preset
Auto Harmonize
Arpeggiator
±1 octaves (–12 to +12 semitones)
Upper/Lower ±2 octaves
A4 = 415.5 to 465.9 Hz (Initial Default: 440.0 Hz)
17
305
180
12 types
90 types

WK-240
– 2 –
MIDI 16 multi-timbre received, GM Level 1 standard
Musical Information Function Tone, Rhythm, Song Bank numbers and names, staff notation,
fingering, pedal operation, tempo, measure and beat number,
chord name, etc.
Inputs/Outputs
USB port
Sustain/Assignable jack
Phones/Output jack
Audio In jack
Mic In/Sampling jack
TYPE B
Standard jack (sustain, sostenuto, soft, rhythm)
Stereo standard jack
Output Impedance: 140 Ω, Output Voltage: 4.5 V (RMS) MAX
Stereo mini jack
Input Impedance: 9 kΩ, Input Sensitivity: 200 mV
Standard jack (connect a dynamic microphone only)
Input Impedance: 3 kΩ, Input Sensitivity: 10 mV
Power Jack DC 9.5 V
Power Supply
Batteries
Battery Life
AC Adaptor
Auto Power Off
2-way
6 D-size zinc-carbon batteries or alkaline batteries
Approximately 5 hours continuous operation on zinc-carbon batteries
AD-E95100L
• The AC adaptor can be used safely in areas up to 4,000 meters
above sea level.
Approximately 6 minutes (during battery operation) or 30 minutes
(during AC adaptor operation) without any operation, Auto Power Off
can be disabled.
Speakers 12 cm × 2 (Output: 2.5 W + 2.5 W)
Power Consumption 9.5 V =7.7 W
Dimensions 116.1 × 38.5 × 13.4 cm (45 3/4× 15 3/16 × 5 1/4inch)
Weight Approximately 6.9 kg (15.2 lbs) (without batteries)
* This data is stored in a shared memory area with a total capacity of approximately 320 Kbytes (1 Kbyte =
1,024 bytes).

WK-240
– 3 –
BLOCK AND WIRING DIAGRAM
KEYBOARD PCB (M709-KYA1)
MAIN PCB
(M822-MDA1)
POWER & AMP PCB
(M829-PSA1)
KEYBOARD PCB (M709-KYA2)
BATTERY
CN802 (10 pin) CN803 (10 pin) CN804 (15 pin)
CN4 (13 pin) CN5 (15 pin)
CN7 (+)
CN8 (-)
CN2 (10 pin) CN7 (5 pin)
CN16 (10 pin) CN20 (5 pin)CN14 (11 pin)
CN15 (+)
CN17 (-)
CN10 (+)
CN9 (-)
CN1 (11 pin)
USB (CN8)
MIC IN (J4)
PHONES (J1)
PEDAL (J1)
SPEAKER (L)
SPEAKER (R)
MIC VOL. (VR2)
MAIN VOL. (VR3)
AUDIO IN (J3)
CN8 (4 pin)
CN801 (13 pin)
FI0~FI3,
SI0~SI3,
KC0~KC4
FI4~FI9,
SI4~SI9,
KC5~KC7
LOUT, ROUT
AUDIO IN/MIC,
ADIN, APO,
STBY_CTL
ARXD,
ATXD
DB4~DB7,
E, R/W, RS, NMI
MPU
LSI1 Flash Memory
(128 Mbit)
LSI3
Button Controller
IC1
LCD
Controller/Driver
IC5
Power
Amplifier
IC2
MA1~MA19
MD0~MD15
MD0~MD15
MA1~MA23
SRAM
(4 Mbit)
LSI4
Filter
IC5
Filter
IC3
Power Supply Circuit
IC6, C24, C25, C27,
C33, C35, C183
Power
Supply Circuit
IC3, Q4, D1
Power Supply Circuit
Q4, Q6, Q7, C35~C37,
C40, C109, D4, D5
VA5
VD3
VD5
VA5
VA3VC
VD5
LOUT
ADIN
APO
ROUT
LCD
BUTTONS
POWER
SWITCH
DC (J2)
VCP
Filter
IC4
D1
D3

WK-240
– 4 –
PCB INFORMATION
M822-MDA1M829-PSA1
M709-KYA1 M709-KYA2
Parts Name PCB Name Functions
Main PCB
PCB UNIT/MAIN M822-MDA1 MPU, SRAM, Flash memory, Power supply circuit, Filter,
SUSTAIN/ASSIGNABLE jack, USB port
Power & Amp PCB
BACK LIGHT UNIT M829-PSA1
Power supply circuit, Power amplifier, Filters,
LCD controller/driver, Button controller, LCD, Buttons,
Power switch, Main volume, Mic volume, DC terminal,
AUDIO IN jack, PHONES/OUTPUT jack,
MIC IN/SAMPLING jack, Speakers
Keyboard PCB
PCB UNIT/KYA M709-KYA1 Keyboard
M709-KYA2

WK-240
– 5 –
CIRCUIT DESCRIPTION
Y Nomenclature of Keys
E1 C2 C3 C4 C5 C6 C7 G7
Y Key Matrix
Each key has two contacts, the first contact and second contact .
[NOTE] The diagram below illustrates how the contacts work.
Key
Second contact
 First contact 
FI
KC
SI
KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7
FI0 E1F1F1#G1G1#A1A1#
SI0 E1F1F1#G1G1#A1A1#
FI1 B1C2C2#D2D2#E2F2F2#
SI1 B1C2C2#D2D2#E2F2F2#
FI2 G2G2#A2A2#B2C3C3#D3
SI2 G2G2#A2A2#B2C3C3#D3
FI3 D3#E3F3F3#G3G3#A3A3#
SI3 D3#E3F3F3#G3G3#A3A3#
FI4 B3C4C4#D4D4#E4F4F4#
SI4 B3C4C4#D4D4#E4F4F4#
FI5 G4G4#A4A4#B4C5C5#D5
SI5 G4G4#A4A4#B4C5C5#D5
FI6 D5#E5F5F5#G5G5#A5A5#
SI6 D5#E5F5F5#G5G5#A5A5#
FI7 B5C6C6#D6D6#E6F6F6#
SI7 B5C6C6#D6D6#E6F6F6#
FI8 G6G6#A6A6#B6C7C7#D7
SI8 G6G6#A6A6#B6C7C7#D7
FI9 D7#E7F7F7#G7
SI9 D7#E7F7F7#G7

WK-240
– 6 –
Y Button Matrix
SWO0 SWO1 SWO2 SWO3 SWO4 SWO5 SWO6
SWI0 BANK, LISTEN Area1, WATCH
RHYTHM,
ONE
TOUCH PRESET
MUSIC PRESET 4 8 9
SWI1 Area2,
REMEMBER Area3, NEXT SONG BANK TONE 7 5 6
SWI2 Area4,
AUTO
STORE,
MUSIC
CHALLENGE
12+
SWI3
CHORDS,
ACCOMP,
PART SELECT
VAR./FILL-IN,
FF TEMPO yVIRTUAL HALL, DEMO 0–3
SWI4 NORMAL/FILL-IN,
REW
START/STOP,
PLAY/STOP TEMPO tSPLIT RECORDER, SAMPLING
AUTO
HARMONIZE/
ARPEGGIATOR,
TYPE
SWI5 INTRO, REPEAT
SYNCHRO/
ENDING,
PAUSE
METRONOME,
BEAT RHYTHM EDITOR LAYER PIANO/ORGAN,
CHORD BOOK FUNCTION

WK-240
– 7 –
PRINTED CIRCUIT BOARDS
Main PCB: M822-MDA1

WK-240
– 8 –
Power & Amp PCB: M829-PSA1

WK-240
– 9 –
Keyboard PCB: M709-KYA1
Keyboard PCB: M709-KYA2

WK-240
– 10 –
DISASSEMBLY
Y About Repair
• The figures in this chapter show a prototype, so the appearance of parts may slightly differ from the
actual parts.
• To avoid damages to the instrument and floor, lay the instrument on a mattress or blanket before
starting disassembling.
• There are several kinds of screws. Be sure to use the correct type of screws when assembling.
It is advisable to sort the screws as shown below after removing them.
• If a screw cap is attached to the screw, remove it.
When assembling, reattach the screw cap.
• Check how cables are wired before removing cables.
When assembling, wire the cables in the same manner as they were before disassembly.
• If a cable is bound by cable tie, tape or similar item, remove it as necessary.
When assembling, bind the cable as it was before disassembly.
Y Before Starting Repair or Servicing
• Remove the AC adaptor, AC cord or batteries.
• Remove accessories such as the music stand.

WK-240
– 11 –
Y Disassembly Procedures
Flowchart
B. PCB UNIT/MAIN C. BACK LIGHT UNIT
A. Panel Units
Assembled Product
D. SPEAKER
E. KEY F. PCB UNIT/KYA
A. Remove the Panel Units
Main Panel Unit Right Panel UnitLeft Panel Unit
A-1. Undo 21 or seven screws on the bottom surface.
[NOTE] To remove only the Main Panel Unit, undo seven screws indicated with red circles in
the figure below.

WK-240
– 12 –
A-2. Place the digital keyboard with keyboard facing up.
A-3. Lift the Main Panel Unit and turn it over.
[NOTE] The Main Panel Unit is connected to the lower case with the cables. Use caution
when turning over the panel unit.
Main Panel Unit
Lead wires
(Left speaker)
Lead wires
(Right speaker)
Lead wires
(Batteries)
Ribbon cable
(KYA1 PCB)
Ribbon cable
(KYA2 PCB)

WK-240
– 13 –
A-4. Unsolder six lead wires and two ribbon cables to remove the Main Panel Unit.
Lead wire (Black)
Lead wire (Green)
Lead wire (Red)
Lead wire (Brown)Lead wire (Blue)
Lead wire (White) Cable ties
Ribbon cable
(KYA1 PCB)
Ribbon cable
(KYA2 PCB)
Notes on Assembly
• The number of pins on the PCB pad differs from that on the cable.
Solder in the way that No.1 pin on the cable (orange) is connected to No.1 pad on the PCB.
Ribbon cable (KYA1 PCB)
PCB: 16 pads
Cable: 13 pins

WK-240
– 14 –
A-5. Undo one screw and remove the Right Panel Unit.
A-6. Undo one screw and remove the Left Panel Unit.
Right Panel UnitLeft Panel Unit

WK-240
– 15 –
B. Remove the PCB UNIT/MAIN
B-1. Unsolder three ribbon cables.
B-2. Undo three screws to remove the PCB UNIT/MAIN.
PCB UNIT/MAIN Ribbon cable (PSA1 PCB)
Ribbon cables
(PSA1 PCB)
Notes on Assembly
• The number of pins on the PCB pad differs from that on the cable.
Solder in the way that No.1 pin on the cable (orange) is connected to No.1 pad on the PCB.
Ribbon cable (PSA1 PCB)
PCB: 16 pads
Cable: 5 pins
Ribbon cable (PSA1 PCB)
PCB: 12 pads
Cable: 11 pins
C. Remove the BACK LIGHT UNIT
C-1. Remove the KNOB/ROTARY.
KNOB/ROTARY

WK-240
– 16 –
C-2. Undo 27 screws and remove the BACK LIGHT UNIT, seven RUBBER BUTTON, and LCD
components.
[NOTE] There are three types of screws. Be sure to use the correct screw when assembling.
BACK LIGHT UNIT
BACK LIGHT UNIT
LCD components

WK-240
– 17 –
Notes on Assembly
• To install the BACK LIGHT UNIT, tighten the screws
for the LCD part in the order indicated by the numbers
shown on the right.
If not tightened correctly, it may cause LCD display
errors.
D. Remove the SPEAKER
D-1. Unsolder two lead wires.
D-2. Undo four screws and remove the SPEAKER.
<Left speaker> <Right speaker>
Lead wire (Brown)
Lead wire (Blue)
Lead wire (White)
Lead wire (Green)
3 6 7 4
2 5 8 1

WK-240
– 18 –
E. Remove the KEY
E-1. Undo 26 screws and then remove the WHITE KEY and BLACK KEY.