CDP-120 SPECIFICATIONS Keyboard 88-key piano keyboard Touch Response 3 types, Off Maximum Polyphony 48 notes (24 for certain tones) Tones Built-in Tones 5; with layer Reverb 1 to 10, Off Chorus 1 to 5, Off Demo Songs 5 songs (tone demo songs)
CDP-120 PCB INFORMATION M914-PSA1 M914-MDA1 M914-KYA1 M914-KYB1 M914-KYC1 Classifi cation Parts Name PCB Name Components MPU, Flash Memory (64 Mbit), Main PCB PCB UNIT/MAIN M914-MDA1 Power Supply Circuit, Filter, USB Port Power Supply Circuit, Power Amplifi er Headphones Amplifi er, Power Switch,...
CDP-120 CIRCUIT DESCRIPTION KEY MATRIX FI10 SI10 Each key has two contacts, the first contact and second contact NOTE: The diagram below illustrates how the contacts work. Second contact First contact – 4 –...
CDP-120 DISASSEMBLY CAUTION z The photos show a prototype. The appearance of the instrument, such as color, may differ from the actual model. z To avoid damages to the instrument and the floor, lay the instrument on a mattress ...
Page 12
CDP-120 DISASSEMBLY A. REMOVE THE PANEL UNITS Left panel unit Main panel unit Right panel unit A-1. Undo 10 or six screws on the bottom surface of the main unit. NOTE: To remove only the main panel unit, undo six screws indicated with red circles in the illustration below.
Page 13
CDP-120 A-4. Place the main unit with the keys facing up. A-5. Lift the main panel unit and turn it over. NOTE: The main panel unit is connected to the lower case unit with the connectors and FFC. Use caution when turn over the main panel unit.
Page 14
CDP-120 A-8. Undo three screws on the RIGHT-SIDE-CASE and then remove the RIGHT-SIDE-CASE. RIGHT-SIDE-CASE A-9. Undo three screws on the LEFT-SIDE-CASE and then remove the LEFT-SIDE-CASE. LEFT-SIDE-CASE – 12 –...
Page 15
CDP-120 A-10. Undo two screws on the RIGHT-SIDE-INNER-CASE and then remove the right panel unit. RIGHT-SIDE-INNER-CASE Right panel unit A-11. Undo two screws on the LEFT-SIDE-INNER-CASE and then remove the left panel unit. LEFT-SIDE-INNER-CASE Left panel unit – 13 –...
Page 16
CDP-120 B. REMOVE THE M914-MDA1 PCB (MAIN PCB) B-1. Remove two connectors. B-2. Undo four screws and then remove the M914-MDA1 PCB. M914-MDA1 PCB Connectors (M914-PSA1) C. REMOVE THE M914-PSA1 PCB (POWER AMP PCB) C-1. Remove the ROTARY-KNOB ROTARY-KNOB C-2. Remove two connectors from the M914-MDA1 PCB.
Page 17
CDP-120 D. REMOVE THE SPEAKER D-1. Unsolder two lead wires. D-2. Undo four screws and then remove the SPEAKER. <Left speaker> <Right speaker> Lead wire (Red) Lead wire (Black) Lead wire (Black) Lead wire (Red) E. REMOVE THE KY-ASSY E-1. Undo three screws and then remove the LEFT-SIDE-INNER-CASE.
Page 18
CDP-120 E-4. Undo three screws and then remove the KY-ASSY. KY-ASSY LOWER-CASE-UNIT – 16 –...
Page 19
CDP-120 DISASSEMBLY OF THE KY-ASSY A. REMOVE THE KEYS <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.
Page 20
CDP-120 A-1. Insert the two tools between the rib of the chassis and a key. A-2. When the tools are inserted to a certain depth, the key begins to be lifted and can then be removed. <Cross-section image> Tool Rib of the chassis...
Page 21
CDP-120 <Installing the keys> • Refer to the illustration below for the location of each white key. • Be sure to install each key at its designated location. • All black keys are the same. A black key may be installed at any correct black-key location.
Page 22
CDP-120 B. REMOVE THE HAMMERS B-1. Place the chassis upside down so that the hammers are visible. B-2. Press the chassis with the tip of tweezers. B-3. While catching a hammer with tweezers, set the tweezers against the resin part of the chassis.
Page 23
CDP-120 <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 (for a white key) Hammer Code (for a white key) Type of Hammer (for a black key)
Page 24
CDP-120 <Installing the hammers> Be sure to install each hammer at its designated location. If a hammer does not move smoothly, check if it is installed at the correct location. Follow the same procedures shown below to install a hammer for both black and white keys.
Page 25
CDP-120 C. REMOVE THE M914-KYA1/KYB1/KYC1 PCBs (KEYBOARD PCB) C-1. Release the connector lock and remove the FFC. C-2. Remove 23 screws and then remove the M914-KYA1/KYB1/KYC1 PCBs. M914-KYA1 PCB M914-KYB1 PCB M914-KYC1 PCB C-3. Remove eight rubber contact strips. NOTE: One rubber contact strip is shorter than the others.
Page 26
CDP-120 <Installing the keyboard PCB (M914-KYA1/KYB1/KYC1)> (1) Connect the FFC to the M914-KYB1 PCB and lock the connector. NOTE: Insert it firmly and lock up. (2) Secure the M914-KYA1/KYB1/KYC1 PCBs with 23 screws. Press the PCBs lightly in the direction of the red arrow in the illustration below while tightening a screw.
NOTE: Be sure to turn OFF the power when the test is finished. (2) Release the “FUNCTION”, “GRAND PIANO 2” and “HARPSICHORD” buttons (3) The diagnostic program starts and then CDP-120 enters in the root mode where it waits for test item selection.
Page 28
CDP-120 TEST PROCEDURES A. BUTTON CHECK A-1. Press the “FUNCTION” button to perform the “BUTTON CHECK”. A-2. Press the button in the order indicated in the illustration. NOTE: You cannot cancel this check procedure mid-way. <If the result passes>...
Page 29
CDP-120 D. PEDAL CHECK D-1. Press the “ELEC PIANO” button to select the “PEDAL CHECK”. D-2. Press the pedal. <If the result passes> The confirmation chord sounds. <If the result fails> The error tone sounds. D-3. Press the “STRINGS” button to return to the root mode.
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 33
CDP-120 1: CDP-120_BLACK_DI 2: CDP-120_BLACK_EU 3: CDP-120_BLACK_UK 4: CDP-120_BLACK_US Q'ty Price Item Code No. Parts Name Specification Remarks Code MAIN PCB 10399371 PCB UNIT/MAIN TK-RJM511112*001 A MDA1 CN19 10236624 CONNECTOR/USB UBR24-4K5G00 D6,D7 10009218 DIODE 1SS400TE61 10211950 IC NJM2068M-D(TE1) IC11 10137770 IC TC7S08FU(TE85L.F)
CDP-120 SCHEMATIC DIAGRAMS Main PCB: M914-MDA1 Not used (to PSA1/CN3) (to PSA1/CN4) (to KYB1/CN803) – 33 –...
Page 36
CDP-120 Power Amp PCB: M914-PSA1 DC 12 V IN (J3) PEDAL (J5) PHONES (J2) (to LEFT SPEAKER) (to RIGHT SPEAKER) (to MDA1/CN11) MAIN VOL. (VR1) POWER SWITCH (to MDA1/CN20) (SW1) LEFT SPEAKER RIGHT SPEAKER – 34 –...
Page 40
Ver. 1 : Dec. 2012 • Correction of the EXPLODED VIEW (P28) • Correction of the PARTS LIST (P32) CASIO COMPUTER CO.,LTD. Overseas Service Division 6-2, Hon-machi 1-Chome Shibuya-ku, Tokyo 151-8543, Japan...