Casio WK-1200 Service Manual
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Casio WK-1200 Service Manual

Electronic keyboard
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See also: User Manual
WK-1200
100 RHYTHMS
ENVELOPE
AMP ENVELOPE
PITCH ENVELOPE
000-048 DECAY
049-137 SUSTAIN
00 FLAT
01-19 VIBRATO
20-49 OTHERS
POWER
TEMPO
ACCOMP VOLUME
MODE
VOLUME
MAX
FULL RANGE
CHORD
FINGERED
CASIO CHORD
NORMAL
MIN
ELECTRONIC KEYBOARD
MUSICAL INFORMATION SYSTEM
TRANSPOSE/
TUNE/MIDI
REVERB
REVERB
FREE SESSION
SYNTH
HALL
GM
STAGE
FREE
SESSION
ROOM
LAYER
SYNTH
MIXER
LAYER
MIXER
SPLIT
MEMORY
TOUCH
STEP
RESPONSE
SPLIT
MEMORY
MEMORY TRACK/DRUM PAD
CHORD/1
2
3
4
5
6
TOUCH
RESPONSE
STEP
200TONES
DEMO
RHYTHM
TONE
3
TIE
REST
ENTER
WK-1200

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Summary of Contents for Casio WK-1200

  • Page 1 WK-1200 100 RHYTHMS 200TONES MUSICAL INFORMATION SYSTEM ENVELOPE AMP ENVELOPE PITCH ENVELOPE 000-048 DECAY 049-137 SUSTAIN 00 FLAT 01-19 VIBRATO 20-49 OTHERS TRANSPOSE/ POWER TUNE/MIDI REVERB DEMO RHYTHM TONE TEMPO ACCOMP VOLUME REVERB FREE SESSION SYNTH HALL STAGE FREE SESSION...

  • Page 2: Table Of Contents

    3 reverb types (HALL, STAGE, ROOM) Auto accompaniment Rhythm patterns: Tempo: Variable (216 steps, = 40 to 255) Chords: 3 fingering methods (CASIO CHORD, FINGERED, FULL RANGE CHORD) Rhythm controller: START/STOP, INTRO, NORMAL /FILL-IN, VAR/FILL-IN, SYNCHRO/ ENDING Accomp volume: 0 to 127 (128 steps)
  • Page 3 Terminals MIDI terminals: IN, OUT Assignable terminal: Standard jack (sustain, sostenuto, soft, rhythm start/stop) Headphone/Output terminal: Stereo standard jack Output Impedance: 200 Ω Output Voltage: 4.9 V (RMS) MAX Power supply terminal: 12 V DC Power supply Dual power supply system Batteries: Six D-size batteries Battery life:...

  • Page 4: Block Diagram

    BLOCK DIAGRAM SEG1 ~ SEG40 Working Storage LCD Driver RAM (256K-bit) MIDI LSI4 P10, P13 LSI501 TC55257DFL-70L(EL) P14, P17 SED1278F0A COM1 ~ COM16 Reset IC RESET RN5VD40AA FI0 ~ FI9 MA14 SI0 ~ SI9 Keyboard Sound Source ROM MD0 ~ MD15 LSI1 (16M-bit) KC0 ~ KC7...

  • Page 5: Circuit Description

    CIRCUIT DESCRIPTION KEY MATRIX Note: Each key has two contacts, the first conatct (1) and second contact (2). First contact (1) Second contact (2) NOMENCLATURE OF KEYS C#1 D#1 F#1 G#1 A#1 C#2 D#2 F#2 G#2 A#2 C#3 D#3 F#3 G#3 A#3 C#4 D#4 F#4 G#4 A#4 C#5 D#5...
  • Page 6 TOUCH REVERB INTRO CHORD RESPONSE NORMAL/ FREE ACCOMP FINGERED FILL-IN SESSION VOLUME CASIO SYNCHRO/ LAYER SYNTH CHORD ENDING VARIATION/ NORMAL SPILIT MIXER FILL-IN POWER SUPPLY CIRCUIT The power supply circuit generates five voltages as shown in the following table. VDD and VC voltages are always generated.
  • Page 7 LCD BACKLIGHT NT-07 DE0405-979SL180J2K C502 HMBV26BG1W63N/AZ CFL1 (Bottom View) T501 LHL08TB101K L501 When voltage CVDD is supplied, transistors Q501 and 502 start oscillation. From the oscillation voltage, transformer T501 generates about 600 V which is necessary for lighting the backlight. RESET CIRCUIT When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU.
  • Page 8 CPU (LSI1: GT-913F) The 16-bit CPU contains a 1k-byte RAM, three 8-bit I/O ports, two timers, a key controller and serial interfaces. The CPU detects key velocity by counting the time between first-key input signal FI and second-key SI from the keyboard.
  • Page 9 v i r DIGITAL SIGNAL PROCESSOR (LSI2: HG51B227FB-1) The DSP receives 16-bit serial sound data output from the CPU and adds the selected effect to the sound data using the effect RAM. Then the DSP provides the sound data to the DAC. The DSP also controls button input/ output.
  • Page 10 Pin No. Terminal In/Out Function EOEB Read enable signal output for the effect RAM VSS3 Ground (0 V) source BWEB Write enable signal output for the effect RAM 62, 66, 70, 74, 78 VSS2 Ground source 63, 67, 71, 75, 79 VDD2 +5 V source 64, 65, 68, 69,...

  • Page 11: Filter Block

    DAC (IC1: UPD6379GR) The DAC receives 16-bit serial data output from the DSP. The data contains digital sound data of the melody, chord, bass, and percussion for the right and left channels. The DAC converts the data into analog waveforms and output them to each channel separately. Synch signal SCK1 SINC...
  • Page 12 POWER AMPLIFIER (IC301: LA4620) The power amplifier is a two-channel amplifier with standby switch. Boot11 IN11+ Input Pre-drive Power OUT11 Amp. Amp. Amp. IN11– – RL Short PoGND1 Protector – IN12– Input Pre-drive Power OUT12 Amp. Amp. Amp. Boot12 Terminal Pop Noise Ripple Protection...

  • Page 13: Adjustment

    ADJUSTMENT DISPLAY PCB 1) Items to be adjusted: 2) Adjustment and Test Point Locations (BOTTOM VIEW) TP2 (top side) VR501 3) Equipment connection/Procedure Vop voltage setting Voltmeter Output Input Input Input Output Output Adjust for Adjust Connection Point Signal Connection Point Adjust for 4.4 ±...

  • Page 14: Major Waveforms

    MAJOR WAVEFORMS Power ON Power OFF 1 Clock signal SINK 2 Clock signal FB1 4 APO signal Test point T5 Test point T3 JH connector pin 4 3 Clock signal FB2 Test point T4 5 Key common signal KC0 7 Sound signal (LMEL) 9 Sound signal (LIN) JC connector pin 3 Test point T2...

  • Page 15: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS Main PCB JCM730-MA1M Sub PCB JCM730-MA2M Top View Bottom View — 14 —...

  • Page 16: Schematic Diagrams

    SCHEMATIC DIAGRAMS Main PCB JCM730-MA1M — 15 —...
  • Page 17 Sub PCB JCM730-MA2M — 16 —...
  • Page 18 Console PCBs JCM730-CN1M/CN2M/CN3M/CN4M — 17 —...
  • Page 19 LCD Driver PCB JCM730-LCD1M — 18 —...
  • Page 20 Keyboard PCBs JCM731T-KY1M/KY2M/KY3M — 19 —...

  • Page 21: Exploded View

    EXPLODED VIEW — 21 —...

  • Page 22: Parts List

    PARTS LIST WK-1200 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. Prices and specifications are subject to change with- out prior notice.
  • Page 23 Item Code No. Parts Name Specification MA1M PCB 6925 8890 PCB/ASSY (MA1M) M240676*1 LSI1 2012 5005 LSI,CPU GT913F(T) LSI2 2012 4494 LSI,DSP HG51B277FB-1 LSI3 2012 5665 LSI/MASK-ROM MX23C1610MC-12CA64 LSI4/LSI5 2012 5572 LSI/S-RAM TC55257DFL-70L(EL) 2105 4746 LSI/D/A CONVERTER UPD6379GR-E1 2012 1883 IC/MOS RN5VD40AA-TR 2590 2699 OSCILLATOR/CERAMIC EFO-B2005E0...
  • Page 24 Item Code No. Part Name Specification Keyboard 6922 2720 KEY SET/LT WHITE M312118*1 6922 2730 KEY SET/LT WHITE M312118*2 6906 8481 KEYSET/BLACK 10P M140369A-3 6926 2500 RUBBER/CONTACT M240699-2 6926 2510 RUBBER/CONTACT M240700-2 Bender 2765 1141 POTENTIOMETER RK1631110-50KB 6906 8492 KNOB/BEND M31488B-4 6911 5261 SPRING/BENDER M41949A-1...
  • Page 25 8-11-10, Nishi-Shinjuku Shinjuku-ku, Tokyo 160, Japan Telephone: 03-3347-4926 MA0700571A...

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