Casio PX-720 Service Manual & Parts Manual
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Casio PX-720 Service Manual & Parts Manual

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PX-720/PX-720C
SEP. 2007
PX-720C
ELECTRONIC KEYBOARD
INDEX
Ver. 6 : Oct. 2015

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  • Page 1 (without price) PX-720/PX-720C SEP. 2007 PX-720C ELECTRONIC KEYBOARD INDEX Ver. 6 : Oct. 2015...

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ------------------------------------------------------------------------------------------ 1 BLOCK AND WIRING DIAGRAM --------------------------------------------------------------------- 2 PCB LAYOUT ----------------------------------------------------------------------------------------------- 3 CIRCUIT DESCRIPTION --------------------------------------------------------------------------------- 4 PRINTED CIRCUIT BOARDS -------------------------------------------------------------------------- 5 DISASSEMBLY --------------------------------------------------------------------------------------------- 7 DIAGNOSTIC PROGRAM ------------------------------------------------------------------------------18 EXPLODED VIEW ----------------------------------------------------------------------------------------21 PARTS LIST ------------------------------------------------------------------------------------------------23 SCHEMATIC DIAGRAMS -------------------------------------------------------------------------------27...

  • Page 3: Specifications

    SPECIFICATIONS Keyboard: 88-key piano keyboard, with Touch Response Maximum Polyphony: 128 notes Tones: • Layer (excluding bass tones) • Split (Low-range bass tones only) Effects: Brilliance (−3 to +3), Reverb (4 types), chorus (4 types), Acoustic Resonance Metronome: • Beats: 0, 2, 3, 4, 6 •...

  • Page 4: Block And Wiring Diagram

    BLOCK AND WIRING DIAGRAM MAIN PCB (M408-MDA1) Control signal Reset IC RESET FLASH (128Mbit) D8 ~ MD15 SAD0 ~ SAD12, SDBA0,SDBA1 A1 ~ A20 RAM (64Mbit) ROM (16Mbit) SDD0 ~ SDD15 D0 ~ D15 MA0 ~ MA3 12MHz KEY CONTROLLER IC11 MD0 ~ MD15 IC10...

  • Page 5: Pcb Layout

    PCB LAYOUT M681-CNA1 PCB M681-CNA4 PCB Rear M681-CNA3 PCB M408-PSA1 PCB M408-MDA1 PCB M681-CNA2 PCB Components MAIN PCB M408-MDA1 MPU, Reset IC, RAM(64Mbit), FLASH memory(128Mbit), ROM(16Mbit), DAC, Key controller SUB PCB M408-PSA1 Power supply circuit, Filter, Power amplifer Console PCBs M681-CNA1 Button, Main volume M681-CNA2...

  • Page 6: Circuit Description

    CIRCUIT DESCRIPTION KEY MATRIX                                     ...

  • Page 7: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS Main PCB M408-MDA1 Sub PCB M408-PSA1 – 5 –...
  • Page 8 Console PCB M681-CNA1 Console PCB M681-CNA2 Console PCB M681-CNA3 Console PCB M681-CNA4 – 6 –...

  • Page 9: Disassembly

    DISASSEMBLY ■ To remove main body and speaker box. *The screws come with the cap. *Do not forget to attach the screw caps when assembling. 1. Remove the Connector and Pedal cord. 2. Remove 2 screws and then the Pedal unit Pedal cord Screws Connector...
  • Page 10 ■ Speaker box disassembly 1. Remove the 20 screws and then the back of the speaker box. 2. Remove the 4 screws for each speaker and then take out the speakers (left and right). ■ Removing the T-BRD-UNIT. 1. Remove 18 screws and then the T-BRD unit. T-BRD unit –...
  • Page 11 ■ Removing the Key cover. 1. Remove the 4 screws and the 2 stoppers on the left and right ends. Stoppers Precautions During Assembly To avoid any risk of damaging the stoppers during installation, do not use an electric screwdriver. 2.
  • Page 12 ■ Removing the PCBs (M408-MDA1 PCB, M408-PSA1 PCB, M681-CNA3 PCB). 1. Remove the twist ties that hold the cables in place. 2. Remove 8 screws 3. Remove the PCB case. M408-MDA1 PCB M408-PSA1 PCB M681-CNA3 PCB – 10 –...
  • Page 13 4. Remove the 11 connectors, release the lock and then remove the FPC. Connector Connector Connector Connector (Keyboard) (Pedal) (M681-CNA3) (M681-CNA2) (SPEAKER(L)) Connector (Power SW) Connector Connector Connector Connector Connector Connector (M681-CNA1) (M681-CNA1) (M408-MDA1) (M681-CNA3) (SPEAKER(R)) (M681-CNA4) 5. Remove 4 screws and the M408-MDA1 PCB. 6.
  • Page 14 ■ Removing the Pedal connector. 1. Remove 2 screws and then the Pedal connector. ■ Removing the Front board. 1. Remove the 10 screws and lift up the front board. * The panel is still connected by a lead. 2. Remove the front board. Front board ■...
  • Page 15 ■ To remove the CN-PANEL 2. Remove 4 screws and the CN-PANEL. CN-PANEL ■ Removing the Side block 1. Remove the 6 screws.(left and right). <The right side> <The left side> 2. Remove the side units (left and right). – 13 –...
  • Page 16 ■ Disassembling the left side unit (M681-CNA1 PCB, M681-CNA2PCB) 1. Remove the side case. 2. Remove 2 screws and the M681-CNA2 unit. 3. Remove 2 nuts and the M681-CNA2 PCB. M681-CNA2 PCB 4. Remove 4 screws. 5. Remove the volume knob and the rubber key and M681-CNA1 PCB. Rubber key M681-CNA1 PCB –...
  • Page 17 ■ Disassembling the right side unit (Power switch) 1. Remove the side case. 2. Remove 2 screws and the Power switch. Power switch – 15 –...
  • Page 18 ■ To remove the Keyboard 1. Remove 2 screws and then 2 brackets 2. Remove 24 screws and then the KEY-BOARD ASSY. 3. Remove the keys. – 16 –...
  • Page 19 Caution while assembling the keys. • Set the key as shown in figures below. 4. Remove 8 rubber keys. * One of the keys has the different length from others. How to install the rubber keys. 5. Remove 9 screws then the MCPZ-KYA1 PCB. 6.

  • Page 20: Diagnostic Program

    DIAGNOSTIC PROGRAM  Initial Setting 1. Connect the AC adaptor. 2. Connect the pedal. NOTE: If there is no pedal, pedal check can be skipped. 3. “Main” volume: MAX  How to start diagnostic program 1. While pressing down “METRONOME”, “RECORDER”, and “/” buttons at the same time, turn the power ON. * Wait for confirmation chords C4, E4, G4 sound.
  • Page 21 3. ROM version check (Internal / External)  Press “TONE/SETTING” button to perform the “ROM check (Internal).” The confirmation chords C4, E4, G4 sounds.  Each time “▲/” button is pressed, the different LEDs light. Confirm with the lit LED. ...
  • Page 22 5. MODEL check  Press the “SOFT” pedal. The confirmation chord E4 sounds and “MODERN” LED lights.  Press the “SOSTENUTO” pedal. The confirmation chord G4 sounds and “MODERN” LED lights.  Press the “DAMPER” pedal. (ON HALF) The confirmation chord C4 sounds and “CLASSIC” LED lights. ...

  • Page 23: Exploded View

    EXPLODED VIEW 43-1 36-1 – 21 –...
  • Page 24 51-1 51-3 51-2 51-4 51-5 52-1 52-2 52-3 52-4 52-5 Screw � Screw � 2 Clip � 2 Screw cap � 2 Screw cap � – 22 –...

  • Page 25: Parts List

    PARTS LIST PX-720/PX-720C 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 26 PX-720_BLACK_DI_120V PX-720_CHERRY_DI_120V PX-720_BLACK_DI_230V PX-720_CHERRY_DI_230V PX-720_BLACK_EU PX-720_CHERRY_EU PX-720_BLACK_UK PX-720_CHERRY_UK PX-720_BLACK_US PX-720_CHERRY_US Q'TY Price Item Parts No. Parts Code Specification Remarks Code MAIN PCB 10286863 PCB ASSY/MAIN TK-RJM508127*001 F6,F7 10122975 CHIP R-C NETWORK EZASSB516BJ F3,4,5,9, 10122976 CHIP R-C NETWORK EZASTB63ABJ 10,11 10123002 IC TC74VHC174FT(EL) 10255468 LSI MB91F036PFF-GE1...
  • Page 27 RJM507971-001V01 10281955 SIDE BLOCK/LEFT RJM507971-002V01 10281445 RUBBER KEY RJM505783-002V02 10286859 PCB ASSY/CNA1 TK-RJM508131*001 IC601,602 10279863 IC TC74VHC164FT(EL.K) VR601 10273791 VARIABLE RESISTOR F-09KGH-CASIO-1 D607,608, 23153132 DIODE 1SS133T-77 609,610 D401-406 10171338 LED LT2P71-81-M1-S06 SW601-607 10228658 TACT SWITCH THVV502GAA 10286860 PCB ASSY/CNA2 TK-RJM508133*001...
  • Page 28 PX-720_BLACK_DI_120V PX-720_CHERRY_DI_120V PX-720_BLACK_DI_230V PX-720_CHERRY_DI_230V PX-720_BLACK_EU PX-720_CHERRY_EU PX-720_BLACK_UK PX-720_CHERRY_UK PX-720_BLACK_US PX-720_CHERRY_US Q'TY Price Item Parts No. Parts Code Specification Remarks Code STAND 10286839 BOARD ASSY/LEFT TK-RJM508087*001 10286840 BOARD ASSY/LEFT TK-RJM508087*002 C For Korea 10286841 BOARD ASSY/LEFT TK-RJM508087*003 10286842 BOARD ASSY/LEFT TK-RJM508087*004 C For Korea 51-1 10246609 BOLT...

  • Page 29: Schematic Diagrams

    SCHEMATIC DIAGRAMS Main PCB M408-MDA1 – 27 –...
  • Page 30 – 28 –...
  • Page 31 Sub PCB M681-PSA1 – 29 –...
  • Page 32 Console PCB M681-CNA1 – 30 –...
  • Page 33 Console PCBs M681-CNA2, CNA3, CNA4 Console PCB M681-CNA2 Console PCB M681-CNA3 Console PCB M681-CNA4 – 31 –...
  • Page 34 Ver. 5 : Jan. 2010 • Correction of the EXPLODED VIEW (P21) • Correction of the PARTS LIST (P25) Ver. 6 : Oct. 2015 • Correction of the PARTS LIST (P25) CASIO COMPUTER CO.,LTD. Overseas Service Division 6-2, Hon-machi 1-Chome Shibuya-ku, Tokyo 151-8543, Japan...

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Px-720c

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