Casio LK-120 Service Manual & Parts Manual
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Casio LK-120 Service Manual & Parts Manual

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LK-120
JUL. 2010
LK-120
ELECTRONIC KEYBOARD
Ver. 2 : Jan. 2012

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Summary of Contents for Casio LK-120

  • Page 1 LK-120 JUL. 2010 LK-120 ELECTRONIC KEYBOARD Ver. 2 : Jan. 2012...

  • Page 2: Table Of Contents

    LK-120 CONTENTS SPECIFICATIONS ................... 1 BLOCK AND WIRING DIAGRAM ..............2 PCB INFORMATION ..................3 CIRCUIT DESCRIPTION ................4 PRINTED CIRCUIT BOARDS ................. 5 DISASSEMBLY ....................7 DIAGNOSTIC PROGRAM ................16 EXPLODED VIEW ..................22 PARTS LIST ....................23 SCHEMATIC DIAGRAMS ................26...

  • Page 3: Specifications

    Auto-accompaniment Rhythm Patterns 50 presets Tempo Adjustable, (216 steps, = 40 to 255), initial value; 120 Chords Two systems; CASIO CHORD, FINGERED Other Fill-in pattern, Synchro start Song Bank Tunes 100 tunes Musical Information Function Tone, Auto Accompaniment, Song Bank numbers and names; tempo,...

  • Page 4: Block And Wiring Diagram

    LK-120 BLOCK AND WIRING DIAGRAM KEYBOARD LED PCB KEYBOARD LED PCB KEYBOARD LED PCB (CSM446-LD5M) (CSM446-LD4M) (CSM446-LD3M) KEYBOARD PCB JE (6 pin) JF (6 pin) JG (6 pin) (M800-KYA1) CN801 (13 pin) CN505 (6 pin) CN504 (6 pin) CN504 (6 pin)

  • Page 5: Pcb Information

    LK-120 PCB INFORMATION M800-KYA1 M820-PSA1 M821-MDA1 M800-KYA2 CSM446-LD3 CSM446-LD4 CSM446-LD5 M821-LDA1 M821-LDA2 Classifi cation Parts Name PCB Name Components MPU, LCD Controller, Keyboard LED Main PCB PCB ASSY/MDA1 M821-MDA1 Controller, Reset IC, Buttons, Right Speaker Terminal Power Supply Circuit, Power Amplifi er,...

  • Page 6: Circuit Description

    LK-120 CIRCUIT DESCRIPTION KEY MATRIX „ „ NOMENCLATURE OF KEYS „ „ BUTTON MATRIX „ „ KO8S KO9S KO10S KO11S KI0S TONE STEP 1 KI1S RHYTHM STEP 2 KI2S SONG BANK STEP 3 KI3S PART SELECT SPEAK ONE KEY PLAY...

  • Page 7: Printed Circuit Boards

    LK-120 PRINTED CIRCUIT BOARDS Main PCB: M821-MDA1 Sub PCB: M820-PSA1 – 5 –...
  • Page 8 LK-120 Keyboard LED PCB: M821-LDA1 Keyboard LED PCB: M821-LDA1 Keyboard PCB: M800-KYA1 Keyboard PCB: M800-KYA2 – 6 –...

  • Page 9: Disassembly

    LK-120 DISASSEMBLY CAUTION „ „ The photos show a prototype. The appearance of the instrument, such as color, may „ differ from the actual model. To avoid damages to the instrument and the floor, lay the instrument on a mattress „...
  • Page 10 LK-120 DISASSEMBLY „ „ PANEL UNIT AA1. Undo 11 screws on the bottom surface of the main unit AAA. When replacing the keyboard LED PCBs, undo 16 screws and then remove the LACOVERAA/B/C. LACOVERAC LACOVERAB LACOVERAA <Caution for installing L-COVER-A/B/C>...
  • Page 11 LK-120 AAA. Turn over the panel unit. AAA. Unsolder two battery lead wires. AAA. Unsolder two FFCs. Lead wire (Red) Lead wire (Black) FFC (M800AKYAA) FFC (M8A1ALDAA) AA6. Remove the panel unit. M8A0APSA1 PCB M8A1AMDA1 PCB – 9 –...
  • Page 12 LK-120 MAIN PCB (M821-MDA1) BA1. Unsolder two FFCs. FFC (M800AKYAA) FFC (M8A1ALDAA) BAA. Unsolder two lead wires and one FFC. Lead wire (White) Lead wire (Blue) FFC (M8A0APSA1) BAA. Unsolder two lead wires connected to the right speaker. Lead wire (White) Lead wire (Blue) –...
  • Page 13 LK-120 BAA. Undo 16 screws and then remove the M8A1AMDA1 PCB, rubber keys and LCD. Rubber keys <Caution for installing M821-MDA1 PCB> To install the M8A1AMDA1 PCB, tighten the screws for the LCD part in the order shown in the right.
  • Page 14 LK-120 POWER AMP PCB (M820-PSA1) CA1. Unsolder two lead wires and one FFC connected to the M8A1AMDA1 PCB. Lead wire (White) Lead wire (Blue) FFC (M8A0APSA1) CAA. Unsolder two lead wires connected to the left speaker. Lead wire (Blue) Lead wire (White) CAA.
  • Page 15 LK-120 KEYBOARD DA1. Undo eight screws and then remove the side panels. Left side panel Right side panel DAA. Undo A1 screws and then remove the white keys and black keys. – 1A –...
  • Page 16 LK-120 KEYBOARD PCB (M800-KYA1/KYA2) EA1. Disengage the hooks and then remove the M800AKYA1/KYAA PCBs. EAA. Remove five rubber contact strips. NOTEN One rubber contact strip differs in length. Rubber contact strips This rubber contact strip differs from the others in length.
  • Page 17 LK-120 KEYBOARD LED PCB (M821-LDA1/LDA2, CSM446-LD3M/LD4M/LD5M) CSMAA6ALDAM PCB CSMAA6ALDAM PCB CSMAA6ALDAM PCB M8A1ALDA1 PCB M8A1ALDAA PCB FA1. Undo 1A screws on the M8A1ALDA1/LDAA PCBs. FAA. Turn over the M8A1ALDA1/LDAA PCBs. NOTEN Do not touch the LEDs. FAA. Unsolder three FFCs and then remove the M8A1ALDA1/LDAA PCBs.

  • Page 18: Diagnostic Program

    LK-120 DIAGNOSTIC PROGRAM INITIAL SETTING „ „ Connect the AC adaptor. Turn the volume to the maximum. HOW TO START THE DIAGNOSTIC PROGRAM „ „ Hold down the “0” and “START/STOP” buttons at the same time, to turn the power ON.
  • Page 19 LK-120 DIAGNOSTIC PROGRAM „ „ MODE SWITCH CHECK A-1. Switch the mode switch and check that the following screen appears on the LCD. Mode Switch FINGERED CASIO CHORD NORMAL – 17 –...
  • Page 20 LK-120 BUTTON CHECK B-1. Press the “0” button to select the “Button Check”. B-(. Press the keys in the order of the numbers indicated in the illustration below. If the button function is OK: The confirmation chord sounds, and the button number and “OK” appear on the LCD.
  • Page 21 LK-120 KEYBOARD LED CHECK D-1. Press the “TONE” button to perform the “LED Check”. Automatically the keyboard LEDs are lit. Check the following points. • The confirmation chords sound and the LEDs are lit in the order indicated in the illustration below.
  • Page 22 LK-120 E-(. Press the “STEP (” button. The LCD displays automatically change with the confirmation chords in the order indicated in the illustration below. AUTO POWER OFF CHECK F-1. Press the “PART SELECT” button to perform the “Auto Power Off Check”.
  • Page 23 LK-120 KEY CHECK NOTEN Perform the tests with regular power-on state. G-1. Check the following points by pressing all keys. • The tones sound correctly by hitting keys. • The pitch of the sound corresponding to a key is correct.

  • Page 24: Exploded View

    LK-120 EXPLODED VIEW – 22 –...

  • Page 25: Parts List

    PARTS LIST LK-120 Notes: 1. Prices and specifications are subject to change without prior notice. 2. Refer to the latest “Parts Price Code” at “PARTS FINDER” on the Casio Service WEB site (https://www.servicecasio.com). 3. As for spare parts order and supply, refer to the “GUIDEBOOK for Spare parts Supply”, published separately. 4. The numbers in item column correspond to the same numbers in drawing. – 23 –...
  • Page 26 LK-120 1: LK-120_DI 2: LK-120_EU 3: LK-120_UK 4: LK-120_US Q'ty Price Item Code No. Parts Name Specification Remarks Code Main PCB (MDA1) 10368210 PCB ASSY/MDA1 TK-RJM510419*001 B Main PCB 10178633 WIRE/for speaker 1007TASC24100B4040 X Blue (+) 10366747 WIRE/for speaker 1007TASC24100W4040...
  • Page 27 LK-120 1: LK-120_DI 2: LK-120_EU 3: LK-120_UK 4: LK-120_US Q'ty Price Item Code No. Parts Name Specification Remarks Code Panel unit 10371166 PLATE/DISPLAY RJM510316-003V02 10301435 KNOB RJM503803-009V01 69095890 CONTACT/SLIDE SWITCH CSB-12D 10417026 FABRIC TAPE RJM511849-001V01 10417025 FABRIC TAPE RJM511833-001V01 10272509...

  • Page 28: Schematic Diagrams

    LK-120 SCHEMATIC DIAGRAMS Main PCB: M821-MDA1 (to PSA1CN201) (to LDA2/CN506) (to KYA2/CN803) RIGHT SPEAKER (to PSA1/CN206) : Not used (to RIGHT SPEAKER) (to PSA1/CN207) – 26 –...
  • Page 29 LK-120 Sub PCB: M820-PSA1 LEFT SPEAKER BATTERY DC 9 V IN (to BATTERY) PHONES/OUTPUT (J201) (J202) (to MDA1/CN6) (to MDA1/CN7) (to LEFT SPEAKER) (to MDA1/CN3) POWER/MODE SWITCH (SW201) (to KYA2/CN803) VOLUME (SW202) : Not used – 27 –...
  • Page 30 LK-120 Keyboard LED PCB: M821-LDA1 (to LD3M/JG) (to LDA2/CN503) – 28 –...
  • Page 31 LK-120 Keyboard LED PCB: M821-LDA2 (to LDA1/CN501) (to LD4M/JF) (to LD5M/JE) (to MDA1/CN2) – 29 –...
  • Page 32 LK-120 Keyboard LED PCB: CSM446-LD3M/LD4M/LD5M (to LDA1/CN502) (to LDA2/CN504) (to LDA2/CN505) – 30 –...
  • Page 33 LK-120 Keyboard PCB: M800-KYA1/KYA2 : Not used (to KYA1/ (to MDA1/ CN801) CN1) : Not used (to KYA2/ CN802) – 31 –...
  • Page 34 • Correction of the PARTS LIST (P24) Ver. 2 : Jan. 2012 • Correction of the EXPLODED VIEW (P22) • Correction of the PARTS LIST (P24 and P25) CASIO COMPUTER CO.,LTD. Overseas Service Division 6-2, Hon-machi 1-Chome Shibuya-ku, Tokyo 151-8543, Japan...

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