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Casio CTK-900 Service Manual

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

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Summary of Contents for Casio CTK-900

  • Page 1 CTK-900 MAY. 2005 CTK-900 ELECTRONIC KEYBOARD INDEX Ver.2 : Nov. 2007...

  • Page 2: Table Of Contents

    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...

  • Page 3: Specifications

    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:...
  • Page 4 Other Functions Transpose: 49 steps (–24 semitones to +24 semitones) Variable (A4 = approximately 440Hz ±100 cents) Tuning: LCD: Adjustable contrast SMF Player Flash memory storage for up to 200 files* • Supported Format: SMF0 Flash Memory Capacity: 4MB (Shared Area: Approximately 3.5MB (waveform data, accompaniment data, SMF data)) •...

  • Page 5: Block Diagram

    BLOCK DIAGRAM LCD PCB (M705-LCD1M) LCD Controller ML9040-B02GA (IC501) CONT Reset IC RESET MA0 ~ MA20 MA0 ~ MA21 ROM (128Mbit) R1151N001C-TR MR27V12800J137TN3D MD0 ~ MD15 EA0 ~ EA15,EA18 RAM (1Mbit) IC10 CY62128VLL-70AZI ED12 ~ ED19 MA0 ~ MA15, MA25 RAM (1Mbit) uPD914AGM-3ED IC12...

  • Page 6: Circuit Description

    CIRCUIT DESCRIPTION KEY MATRIX 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...

  • Page 7: Printed Circuit Board

    PRINTED CIRCUIT BOARDS MAIN PCB M707-MD1 Top View Bottom View — 5 —...
  • Page 8 SUB PCB M705-MA2M Top View LCD PCB M705-LCD1M Top View — 6 —...
  • Page 9 CONSOLE PCB M705-CN1M Top View CONSOLE PCB M705-CN2M CONSOLE PCB M705-CN3M CONSOLE PCB M705-CN4M Top View Top View Top View — 7 —...

  • Page 10: Disassembly

    DISASSEMBLY 1. Remove the battery cover and then battery. 2. Remove 27 screws and then upper case. I 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 (JF) Connector (JD) Connector (JC)
  • Page 11 I Precaution while assembling the main PCB (M707-MD1). Refer to the illustration below because many cables appear. PCB (M705-LCD1M) PCB (M705-CN3M) M705-CN2M PCB PCB (M705-CN1M) JC(12pin) JD(14pin) PCB (M705-MA2M) PCB (M705-MA1M) JA(16pin) JB(17pin) JE(10pin) JC(12pin) JF(12pin) JD(14pin) JA(16pin) JB(17pin) PCB (M705-CN1M) JE(10pin) JF(12pin) PCB (M705-MA1M)
  • Page 12 I 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). Speaker cord (orange) Speaker cord (blue) Speaker cord (white)
  • Page 13 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). Connector (JL2) 14. Remove two screws on the PCB (M705-CN2M). 15.
  • Page 14 I 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. D307 D301 D302...
  • Page 15 To remove the key PCB (CSM618T-KY1M, KY2M) 19. Remove 13 screws and the bottom case. 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.
  • Page 16 22. Remove 22 screws and then the white keys. Note: Pay attention to the positions of the screw holes when reassembling. 23. Remove the black keys. — 14 —...

  • Page 17: Diagnostic Program

    DIAGNOSTIC PROGRAM 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.
  • Page 18 1 Press “TEMPO ” button. 1 LED CHK 2 LEDs illuminate in the following order. a . FULL RANGE CHORD b . FINGERED c . CASIO CHORD d . DATA ACCESS e . DRAWBAR ORGAN f . DSP 1 LED END...
  • Page 19 11. LCD check 1 Press “TEMPO ” button. 2 Turn on all segments of the LCD. 3 Press “BANK” button. 4 The area 1 turns as check pattern. 5 Press “REGISTRATION 1” button. 6 The area 1 turns as check pattern. 7 Press “REGISTRATION 2”...

  • Page 20: Exploded View

    EXPLODED VIEW Stick the rating label (Parts No:10199409) – 18 –...

  • Page 21: Parts List

    PARTS LIST CTK-900 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.
  • Page 22 P r i c e I t e m Code No. Part Name Specification Q T Y Remark Code Main PCB 10200663 PCB ASSY/MAIN TK-RJM505695*001 TC74HCT08AF(EL) 10122996 IC10 10054502 UPD914AGM-3ED TC74LCX138FT(EL.K) IC11 10197798 IC13 20125987 TC190C020AF-001 TC74LCX00FT(EL.K) IC16 10197797 CY62128DV30LL70ZAI IC2,12 10164063 UPD6379LGR-E1...
  • Page 23 P r i c e I t e m Code No. Part Name Specification Q T Y Remark Code LCD PCB 10123434 PCB ASSY/LCD1M TK-RJM502998*001 ML9040-B02GA IC501 10006502 Keyboard PCBs 10053891 PCB ASSY/KY1M M140687*9 D501-564 23010101 DIODE 1S2473T-77-T 10053893 PCB ASSY/KY2M M140688*9 D565-622 23010101...

  • Page 24: Schematic Diagrams

    SCHEMATIC DIAGRAMS MAIN PCB M707-MD1 — 22 —...
  • Page 25 SUB PCB M705-MA2M — 23 —...
  • Page 26 CONSOLE PCB M705-CN1M/CN2M/CN3M/CN4M — 24 —...
  • Page 27 LCD PCB M705-LCD1M — 25 —...
  • Page 28 Ver.1 : July. 2005 • Replacement of the PARTS LIST (P20, 21) Ver.2 : Nov. 2007 • Correction of the EXPLODED VIEW (P18) CASIO COMPUTER CO.,LTD. Overseas Service Division 6-2, Hon-machi 1-Chome Shibuya-ku, Tokyo 151-8543, Japan...

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