Casio PX-150 Service Manual
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Casio PX-150 Service Manual

Casio PX-150 Service Manual

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PX-150
AUG. 2012
Ver. 5 : Jun. 2014

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Summary of Contents for Casio PX-150

  • Page 1 PX-150 AUG. 2012 Ver. 5 : Jun. 2014...

  • Page 2: Table Of Contents

    PX-150 CONTENTS SPECIFICATIONS ................... 1 BLOCK AND WIRING DIAGRAM ..............2 PCB INFORMATION ..................3 CIRCUIT DESCRIPTION ................4 PRINTED CIRCUIT BOARDS ................. 6 DISASSEMBLY ....................9 DIAGNOSTIC PROGRAM ................36 EXPLODED VIEW ..................47 PARTS LIST ....................50 SCHEMATIC DIAGRAMS ................56...

  • Page 3: Specifications

    PX-150 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 0 to 3), Reverb (4 types), Chorus (4 types), DSP, Damper Resonance • Beats: 0, 2, 3, 4, 5, 6...

  • Page 4: Block And Wiring Diagram

    PX-150 BLOCK AND WIRING DIAGRAM KEYBOARD PCB (M920-KYA1) KEYBOARD PCB (M920-KYB1) KEYBOARD PCB (M920-KYC1) CN801 (17 pin) CN802 (17 pin) CN803 (30 pin) CN804 (17 pin) CN805 (17 pin) PEDAL CONNECTOR MAIN PCB (M920-MDA1) KI0~KI21, KS0~KS2, KB0~KB3 CN3 (30 pin)

  • Page 5: Pcb Information

    PX-150 PCB INFORMATION M920-CNA2 M920-CNA1 M920-HPA1 M920-PSA1 M920-MDA1 M920-KYA1 M920-KYB1 M920-KYC1 Parts Name PCB Name Functions MAIN PCB MPU, SDRAM, EEPROM, Power supply circuits, Preamp, PCB UNIT/MAIN M920-MDA1 Filter, DAC, APO Circuit, Electronic volume, USB port, Pedal connector POWER & AMP PCB...

  • Page 6: Circuit Description

    PX-150 CIRCUIT DESCRIPTION „ Nomenclature of Keys „ C1# D1# F1# G1# A1# C2# D2# F2# G2# A2# C3# D3# F3# G3# A3# C4# D4# F4# G4# A4# C5# D5# F5# G5# A5# C6# D6# F6# G6# A6# C7# D7#...
  • Page 7 PX-150 (KB0) (KB0) (KB0) (KB0) (KB0) (KB0) (KB1) (KB1) (KB1) (KB1) (KB1) (KB1) KI13 (KB2) (KB2) (KB2) (KB2) (KB2) (KB2) (KB3) (KB3) (KB3) (KB3) (KB3) (KB3) (KB0) (KB0) (KB0) (KB0) (KB0) (KB0) (KB1) (KB1) (KB1) (KB1) (KB1) (KB1) KI14 (KB2)

  • Page 8: Printed Circuit Boards

    PX-150 PRINTED CIRCUIT BOARDS MAIN PCB: M920-MDA1 POWER & AMP PCB: M920-PSA1 – 6 –...
  • Page 9 PX-150 CONSOLE PCB: M920-CNA1 CONSOLE PCB: M920-HPA1 CONSOLE PCB: M920-CNA2 KEYBOARD PCB: M920-KYA1 – 7 –...
  • Page 10 PX-150 KEYBOARD PCB: M920-KYB1 KEYBOARD PCB: M920-KYC1 – 8 –...

  • Page 11: Disassembly

    PX-150 DISASSEMBLY „ About Repair „ • 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 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 reassembling.
  • Page 12 PX-150 „ Flowchart „ NOTE: If the stand and/or the pedal unit is used, remove the piano unit from them before servicing. For the procedures on how to remove the stand and/or the pedal unit, refer to the user’s guide supplied with them.
  • Page 13 PX-150 „ Disassembly Procedure „ A. Remove the Case Left panel unit Console Unit Right panel unit A-1. Undo screws on the bottom surface. NOTE: The number of screws differs by the unit to be removed. Screws to Undo Parts...
  • Page 14 PX-150 A-3. Undo the screw inside the case, which is visible through the hole when the LOWER COVER is removed. NOTE: The number of screws differs by the unit to be removed. NOTE: Do not drop the screws inside the case.
  • Page 15 PX-150 A-4. Place the digital piano with keyboard facing up. A-5. Lift the console unit and turn it over. NOTE: The console unit and piano unit are connected with cables. Use caution when turn over the console unit. Console unit...
  • Page 16 PX-150 B. Remove the Console Unit B-1. Disconnect four connectors and then remove the console unit. NOTE: Release the connector lock before disconnecting the flat cable. Type Connected From Connected To (CN No.) Harness Left speaker PSA1 PCB (CN9) Harness Right speaker PSA1 PCB (CN6) Harness MDA1 PCB...
  • Page 17 PX-150 <Notes on Assembly> • There is no gap between the KEY FELT for the console unit and that for the panel unit, which are placed behind the black key. NOTE: Assemble the other side in the same manner. KEY FELT...
  • Page 18 PX-150 C-2. Undo two screws on the side surface and then remove the panel unit. NOTE: Remove the other side in the same manner. Panel unit <Caution When Replacing With New Parts> • If the PACKING has been removed to replace the KEYBOARD UNIT or its components, be sure to attach the PACKING when assembling.
  • Page 19 PX-150 <Notes on Assembly> • The KEY FELT for the panel unit must be positioned between the PACKING and the black key (C2# and G6#). • Arrange the cables of the right speaker as shown below. PACKING PACKING Black key (C2#)
  • Page 20 PX-150 D. Remove the PCB UNIT/MAIN D-1. Disconnect two connectors. D-2. Undo five screws and then remove the PCB UNIT/MAIN. PCB UNIT/MAIN Connectors – 18 –...
  • Page 21 PX-150 E. Remove the PCB UNIT/POWER & AMP E-1. Disconnect one connector from the MDA1 PCB. E-2. Disconnect one connector. E-3. Undo six screws and then remove the PCB UNIT/POWER & AMP. Connector PCB UNIT/POWER & AMP MDA1 PCB Connector F.
  • Page 22 PX-150 G. Remove the PCB UNIT/CNA NOTE: The PCB UNIT/CNA consists of the CNA1 PCB and CNA2 PCB. G-1. Disconnect one connector from the MDA1 PCB. PCB UNIT/CNA Connector CNA2 PCB CNA1 PCB MDA1 PCB G-2. Undo 13 screws and then remove the PCB UNIT/CNA.
  • Page 23 PX-150 <Caution When Replacing With New Parts> • A new PCB UNIT/CNA does not come with the SPONGE/35X150. When replacing the PCB UNIT/CNA, attach the SPONGE/35X150 to the cables. <Notes on Assembly> • Before assembling the PCB UNIT/CNA, check that the KNOB/for ROTARY, TACT BUTTON, LED COVER, LED SPACER, and FABRIC SHEET have been assembled to the CASE/PANEL.
  • Page 24 PX-150 I. Remove the KEYBOARD UNIT & CASE UNIT/LOWER I-1. Undo three screws. KEYBOARD UNIT CASE UNIT/LOWER I-2. Have a table or base ready. Place the piano unit on the table or base, with keyboard facing down. NOTE: The table or base to use must meet the following conditions: • The height of the KEYBOARD UNIT and the table or base combined must be higher...
  • Page 25 PX-150 I-3. Undo 26 screws on the bottom surface and then remove the KEYBOARD UNIT and CASE UNIT/ LOWER. CASE UNIT/LOWER KEYBOARD UNIT <Caution When Replacing With New Parts> • If the SHEET/V-ZERO and SPONGE have been removed to replace the KEYBOARD UNIT or its components, be sure to attach them when assembling.
  • Page 26 PX-150 „ Disassembly of the KEYBOARD UNIT „ A. Remove the KEY <Removing the Keys> • To remove the keys, you will need two of the tools described below. • Before removing a black key, you must first remove both white keys on either side of the black key. • White keys may be removed with the same procedures as removing black keys.
  • Page 27 PX-150 A-1. Undo 12 screws and then remove four KEY SPACER. NOTE: There are four types of the KEY SPACER. Be sure to use the correct type when assembling. KEY SPACER/A KEY SPACER/B KEY SPACER/C KEY SPACER/D KEY SPACER/A KEY SPACER/B...
  • Page 28 PX-150 A-2. Insert the two tools between the rib of the chassis and a key and then remove the key. NOTE: When you insert the tools to a certain extent, the latch which fixing the key is disengaged and the keys are lifted for removal. Tools Chassis <Cross-section Image> Tool Rib of the chassis – 26 –...
  • Page 29 PX-150 <Reference: Musical Scale> • The scale shown below is used for the piano. Scale Note (Do) (Re) (Mi) (Fa) (So) (La) (Ti) B C D E F G A B C D E F G A B C D E F G A B C D E F G A B C D E F G A B C D E F G A B C D E F G A B SC <Keyboard Layout>...
  • Page 30 PX-150 <Caution When Replacing With New Parts> • A set of new white keys consists of the parts below. NOTE: Remove the part indicated with a red line before use. NOTE: The parts for the keys at both ends and the second one from the left end differ from the other keys with the same notes.
  • Page 31 PX-150 <Applying Grease> • Apply grease on the guide for keys as necessary after the keys are replaced. NOTE: Apply grease on the side of the guide for keys. Specification Code No. Parts Name 94816509 SLICONE GREASE G-501.80G-PC Guide for black key...
  • Page 32 PX-150 <Installing the Keys> • Follow the steps below to install the white and black keys. NOTE: The white keys must be arranged in a specific order. Install them according to the correct order of the note. Be sure to install the white key at a hammer for a white key. NOTE: Install a black key before installing the white keys on its sides. Be sure to install the black key at a hammer for a black key.
  • Page 33 PX-150 B. Remove the HAMMER B-1. Place the chassis upside down so that the hammers are visible. <Identifying the Hammers When Placed Upside Down> • The size chassis hole differs between white and black keys. The hammer for a black key goes into a bigger hole, while the hammer for a white key goes into a smaller hole.
  • Page 34 PX-150 <Kinds of Hammers> • There are several kinds of hammers. The type of a hammer may be identified by the code engraved on it. Type of Hammer: “W” for a white key, “B” for a black key. Hammer Code: The hammers for white keys are coded W1, W2, W3, and W4. The hammers for black keys are coded B1, B2, B3, and W4.
  • Page 35 PX-150 <Installing the Hammers> • Follow the steps below to install the hammers for white and black keys. NOTE: The hammers must be arranged in a specific order. Install them according to the correct order. NOTE: If a hammer does not move smoothly, check to see if it is installed at the correct location.
  • Page 36 PX-150 C. Remove the PCB UNIT/KY AND RUBBER CONTACT NOTE: The PCB UNIT/KY AND RUBBER CONTACT consists of the KYA1 PCB, KYB1 PCB, and KYC1 PCB. C-1. Release the connector lock and remove the FLAT CABLE. C-2. Undo 23 screws and then remove the PCB UNIT/KY AND RUBBER CONTACT.
  • Page 37 PX-150 <Installing the PCB UNIT/KY AND RUBBER CONTACT> • Secure the PCB UNIT/KY AND RUBBER CONTACT with 23 screws. NOTE: Tighten the screws while pressing the PCB in the direction of the red arrow shown below. • Connect the FLAT CABLE to the KYB1 PCB and lock the connector.

  • Page 38: Diagnostic Program

    PX-150 DIAGNOSTIC PROGRAM „ Test Items / Flowchart „ Start “FUNCTION” + “SONG” + “RECORDER” + POWER ON Start the Diagnostic Program (Flash Sum Check / LED Check) “FUNCTION” × 2 Model Check “FUNCTION” ROM Version Check “FUNCTION” × 2...
  • Page 39 PX-150 „ Preparation „ (1) Connect the AC adaptor. (2) Connect the pedal (SP-3, SP-20, or SP-33). NOTE: SP-3 is the pedal that comes with this digital piano. Connect it to the DAMPER PEDAL jack on the back of the digital piano.
  • Page 40 PX-150 „ Test Procedure „ ADDITIONAL NOTE: Refer to the below for the pitch of the confirmation or error tones which you hear during the test. C1# D1# F1# G1# A1# C2# D2# F2# G2# A2# C3# D3# F3# G3# A3# C4# D4# F4# G4# A4# C5# D5# F5# G5# A5# C6# D6# F6# G6# A6# C7# D7#...
  • Page 41 NOTE: To skip this check, press the “FUNCTION” button twice and proceed to the next check. B-1. Press the “FUNCTION” button. NOTE: The confirmation chord (C4/E4/G4) sounds. B-2. Press the “FUNCTION” button again. NOTE: The model identification tone (C2) sounds immediately after the confirmation chord (C4/ E4/G4). B-3. Check that the model identification tone sounds and also that the following LED is flashing. <For PX-150> • Model identification tone: C2 • Flashing in Red: SONG (Right) – 39 –...
  • Page 42 PX-150 C. ROM Version Check (This section describes how to identify the ROM version, not to test it.) NOTE: To skip this check, press the “FUNCTION” button and proceed to the next check. C-1. When you press the “FUNCTION” button, the following LEDs illuminate and the ROM Version Check Mode enters into its stand-by status.
  • Page 43 PX-150 D. Button Check NOTE: This check cannot be skipped. D-1. Press the “FUNCTION” button twice. NOTE: The confirmation chord (C4/E4/G4) sounds each time you press the button. D-2. Press the buttons in the order shown below. If the result passes (OK): • The confirmation tone (C6) sounds. • When press the “ELEC PIANO” button at the end, the confirmation chord (C4/E4/G4) sounds. If the result fails (NG): • If there is a button failure or the buttons are pressed in a wrong sequence, the error tone (F2)
  • Page 44 PX-150 E-3. Press the “DAMPER” pedal fully and then check that the “ELEC PIANO” LED is lit. NOTE: The confi rmation tone (C4) sounds. • Lit in Red: ELEC PIANO E-4. Press the “DAMPER” pedal halfway (half-pedal) and then check that the “ELEC PIANO” LED is fl ashing.
  • Page 45 PX-150 G. Speaker Polarity Check NOTE: When you choose to skip this check, simply proceed to the next check. G-1. Press the “MODERN” button and then check that the “MODERN” LED is lit. • Lit in Red: MODERN G-2. Press any key and then check that the sound correctly comes out (sine wave).
  • Page 46 PX-150 I. RAM Check NOTE: To skip this check and end the diagnostic program, press the “FUNCTION” button twice to restart the digital piano in the user mode. Press the “FUNCTION” button and then check that the following LEDs are flashing. I-1. NOTE: The confirmation chord (C4/E4/G4) sounds. • Flashing in Yellow: SONG (Left) • Flashing in Red: SONG (Right) I-2.
  • Page 47 PX-150 „ Resetting the Touch Response Adjustment Data „ <Caution> Be sure to reset the touch response adjustment data by following the steps below after the main PCB or a keyboard component is replaced. <Applicable Parts> • Main PCB (MDA1 PCB) • KEYBOARD UNIT...
  • Page 48 PX-150 (3) Press the “METRONOME” button and then check that the following LEDs are lit. • Lit in Red: R, ELEC PIANO (4) Press the “ELEC PIANO” button and then check that the following LEDs are lit. • Lit in Yellow: SONG (Left) • Lit in Red: RECORDER, R, ELEC PIANO...

  • Page 49: Exploded View

    PX-150 EXPLODED VIEW CONSOLE UNIT BUTTON AREA Cross-section View 20-1 20-1 – 47 –...
  • Page 50 PX-150 KEYBOARD UNIT Detail A – 48 –...
  • Page 51 PX-150 MAIN CASE UNIT Detail A & B KEYBOARD UNIT Detail C – 49 –...

  • Page 52: Parts List

    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.
  • Page 53 PX-150 1: PX-150_BLACK_DI 5: PX-150_WHITE_DI 2: PX-150_BLACK_EU 6: PX-150_WHITE_EU 3: PX-150_BLACK_UK 7: PX-150_WHITE_UK 4: PX-150_BLACK_US 8: PX-150_WHITE_US Q'ty Item Code No. Parts Name Specification Remarks MAIN PCB 10433488 PCB UNIT/MAIN TK-RJM512339*001 MDA1 CN14 10236624 CONNECTOR/USB UBR24-4K5G00 10429820 LSI/MEMORY TC58NVG0S3ETA00B3H IC10...
  • Page 54 PX-150 1: PX-150_BLACK_DI 5: PX-150_WHITE_DI 2: PX-150_BLACK_EU 6: PX-150_WHITE_EU 3: PX-150_BLACK_UK 7: PX-150_WHITE_UK 4: PX-150_BLACK_US 8: PX-150_WHITE_US Q'ty Item Code No. Parts Name Specification Remarks CNA PCB & HPA PCB 10433485 PCB UNIT/CNA TK-RJM512320*001 C CNA1/CNA2 VR601 10399354 VARIABLE RESISTOR...
  • Page 55 PX-150 1: PX-150_BLACK_DI 5: PX-150_WHITE_DI 2: PX-150_BLACK_EU 6: PX-150_WHITE_EU 3: PX-150_BLACK_UK 7: PX-150_WHITE_UK 4: PX-150_BLACK_US 8: PX-150_WHITE_US Q'ty Item Code No. Parts Name Specification Remarks 10433684 FABRIC SHEET/A RJM512456-001V01 10439084 FABRIC SHEET/B RJM512457-002V01 69265810 SPONGE/35X60 M440593-1 69261580 SPONGE/35X150 M440499-1 10432625...
  • Page 56 PX-150 1: PX-150_BLACK_DI 5: PX-150_WHITE_DI 2: PX-150_BLACK_EU 6: PX-150_WHITE_EU 3: PX-150_BLACK_UK 7: PX-150_WHITE_UK 4: PX-150_BLACK_US 8: PX-150_WHITE_US Q'ty Item Code No. Parts Name Specification Remarks 10398219 FELT/UPPER LIMIT/HAMMER RJM511203-001V01 10294093 FELT/LOWER LIMIT/HAMMER TK-RJM507910*001 10388000 PLATE RJM510952-001V01 10343387 FABRIC TAPE/ACP RJM510100-001V01...
  • Page 57 PX-150 1: PX-150_BLACK_DI 5: PX-150_WHITE_DI 2: PX-150_BLACK_EU 6: PX-150_WHITE_EU 3: PX-150_BLACK_UK 7: PX-150_WHITE_UK 4: PX-150_BLACK_US 8: PX-150_WHITE_US Q'ty Item Code No. Parts Name Specification Remarks ACCESSORIES 10430927 AC ADAPTOR AD-A12150LW-F3B without AC cord 10361066 AC CORD UC2LT-M006A US type plug...

  • Page 58: Schematic Diagrams

    PX-150 SCHEMATIC DIAGRAMS MAIN PCB: M920-MDA1 (1/2) (to CNA1/ CN601) (CN14) (to Pedal Connector) (to KYB1/CN803) Not used – 56 –...
  • Page 59 PX-150 MAIN PCB: M920-MDA1 (2/2) (to PSA1/ CN1) Not used – 57 –...
  • Page 60 PX-150 POWER & AMP PCB: M920-PSA1 DAMPER PEDAL DC 12 V (J1) (J4) (to LEFT SPEAKER) (to RIGHT SPEAKER) (to HPA1/ CN702) (to MDA1/ CN16) Not used LEFT SPEAKER RIGHT SPEAKER – 58 –...
  • Page 61 PX-150 CONSOLE PCB: M920-CNA1 (to CNA2/CN603) (to MDA1/CN1) POWER SWITCH – 59 –...
  • Page 62 PX-150 CONSOLE PCB: M920-CNA2 CONSOLE PCB: M920-HPA1 PHONES PHONES (J701) (J702) (to CNA1/CN602) MAIN VOL. (VR601) (to PSA1/CN17) Not used – 60 –...
  • Page 63 PX-150 KEYBOARD PCB: M920-KYA1 (to KYB1/CN802) – 61 –...
  • Page 64 PX-150 KEYBOARD PCB: M920-KYB1 (to MDA1/CN3) (to KYC1/CN805) (to KYA1/CN801) – 62 –...
  • Page 65 PX-150 KEYBOARD PCB: M920-KYC1 (to KYB1/CN804) – 63 –...
  • Page 66 Ver. 4 : Dec. 2013 • Correction of the EXPLODED VIEW (P47) • Correction of the PARTS LIST (P53) Ver. 5 : Jun. 2014 • Correction of the PARTS LIST (P53) CASIO COMPUTER CO., LTD. CS Technical Department TOKYO, JAPAN...

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