Casio CTX870IN Service Manual

CT-X870IN / VER.2

DISASSEMBLY

1. Precautions

Y

About repair

• The fi gures in this chapter show a prototype, so the appearance of parts may slightly diff er from the
actual parts.

• To avoid damages to the instrument and fl oor, 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 assembling.
It is advisable to sort the screws as shown below after removing them.

• If a screw cap is attached to the screw, remove it.
When assembling, reattach the screw cap.

• Check how cables are wired before removing cables.
When assembling, wire the cables in the same manner as they were before disassembly.

• If a cable is bound by cable tie, tape or similar item, remove it as necessary.
When assembling, bind the cable as it was before disassembly.

• The number of pins of ribbon cable is sometimes diff erent from the number of pads of PCB.
Solder the pin No. 1 (orange) of cable on the pad No. 1 of PCB.

Y

Before starting repair or servicing

• Remove the AC adaptor, AC cord or batteries.

• Remove accessories such as the music stand.

– 1 –

2. Disassembly Procedure

Y

Flowchart

Assembled Product

A. Case

B. Main Panel

C. Side Panel

F. BENDER-UNIT

G. SPEAKER

CT-X870IN / VER.2

D. PCB UNIT/MAIN

E. BACK LIGHT UNIT Disassembly of the Backlight Block

H. KEY

I. PCB UNIT/KEYBOARD/KYA

– 2 –

A. Removing the Case

A-1. Undo screws on the bottom surface.

• To remove the main panel, undo 7 screw A.

• To remove the left side panel, undo 7 screw A and 5 screw B.

• To remove the right side panel, undo 7 screw A and 5 screw C.

CT-X870IN / VER.2

Right side panelLeft side panel Main panel

Notes on Assembly

• Check that cables are not covering the screw hole before tightening a screw.

: Screw C : Screw B : Screw A

– 3 –

CT-X870IN / VER.2

A-2. Place the digital keyboard with the keyboard facing up.

NOTE: The panel(s) and lower case are not secured at this point.

Hold the panel(s) with your hands when turning over the digital keyboard.

A-3. Lift the main panel and turn it over.

NOTE: The main panel and lower case are connected with cables. Use caution so as not to

apply too much tension to the cables when lifting the main panel.

NOTE: Mat a cushion material (cloth etc.) not to damage the keyboard before placing the

main panel.

Main panel Cushion material

– 4 –

CT-X870IN / VER.2

Checking the Main Panel Type and Attaching the Spacer

• There are three types of the power terminal opening (on the reverse side) of the main panel.
For Type A, attach the spacer (SHEET/V-ZERO) the same way as Type B.
No spacer is necessary for Type C.

Type A Type B Type C

Spacer

Rib

(SHEET/V-ZERO)

<Spacer Position>

Code No. Parts Name Specifi cation Q’ty Remarks

10609381 SHEET/V-ZERO RJM517844-001V01 2 Black

• Fig. 1: Attach the spacer at 0 to 1.0 mm from the edge of the terminal opening.

• Fig. 2: Position the spacer against the bottom surface of the lower case.

Fig. 1 Fig. 2

– 5 –

CT-X870IN / VER.2

Notes on Assembly

• When any of lead wires is replaced, arrange the lead wires to the rib of lower case and
bundle the 6 lead wires with SPONGE/50X260.
* For the affi xing position of sponge, refer to the rib of lower case shown in the fi gure below.

Rib

SPONGE/50X260

• Before assembling the main panel, check the knot of cable tie that fi xes lead wires to PSA1
PCB is in the correct direction.

– The knot should be laterally facing the PCB.

* If the main panel is closed while the knot faces upward, it interferes with the keyboard

and the main panel may fl oat.

• Fig. 1: Before assembling the main panel, arrange ribbon cables (x3) as shown in the fi gure

below and bundle them with a cable tie.

Fold and tuck an excess length of the pitch bend cable under the KYA PCB cable



Hold the ribbon cables with a clip



Fold the ribbon cables upward (approx. 90 degrees)



• Fig. 2: When assembling the main panel, hold the cables shown in the red frame in the fi gure

below by hand and close the main panel.

Fig. 1 Fig. 2

: Cable tie

– 6 –

B. Removing the Main Panel

B-1. Unsolder to disconnect the following cables and remove the main panel.

NOTE: Release the ribbon cables from the clip.

MEMO: The lead wires are fi xed to the hole of PSA1 PCB with a cable tie.

Cable / Remarks Connected From

CT-X870IN / VER.2















: Cable tie

2 lead wires From the left: White, green Left speaker

2 lead wires From the left: Black, red Battery springs

2 lead wires From the left: Blue, brown Right speaker

Ribbon cable 3-pin Pitch bend

Ribbon cable 13-pin (PCB: 14 pads) KYA1 PCB

Ribbon cable 11-pin (PCB: 15 pads) KYA2 PCB

Clip











– 7 –

CT-X870IN / VER.2

C. Removing the Side Panel

C-1. Undo 2 screws (S4).

C-2. Remove the side panel cables from the rib of lower case and remove left side panel or right

side panel.
To completely remove the side panel, refer to the next page.

: S4 : Rib

– 8 –

Y

Left Side Panel

(1) Unsolder to disconnect the following cables.

NOTE: Release the cables from the cable tie and clip.

NOTE: Remove the cables from the rib of lower case.

MEMO: The lead wires are bundled with sponge tape.

(2) Undo 1 screw and remove the FERRITE CORE.

Cable / Remarks Connected From

CT-X870IN / VER.2





2 lead wires From the left: White, green PSA1 PCB

Ribbon cable 3-pin MDA1 PCB



: Cable tie

Y

Right Side Panel

(1) Unsolder to disconnect the following cable.

NOTE: Remove the cable from the rib of lower case.

MEMO: The lead wires are bundled with sponge tape.

FERRITE CORE Clip



: Cable tie : Screw

: Cable tie





Cable / Remarks Connected From

2 lead wires From the left: Blue, brown PSA1 PCB

– 9 –

D. Removing the PCB UNIT/MAIN

D-1. Unsolder to disconnect the following cables.

Cable / Remarks Connected From

CT-X870IN / VER.2













D-2. Undo 3 screws and remove the PCB UNIT/MAIN.

Ribbon cable 3-pin Pitch bend

Ribbon cable 13-pin (PCB: 14 pads) KYA1 PCB

Ribbon cable 11-pin (PCB: 15 pads) KYA2 PCB

Ribbon cable 10-pin PSA1 PCB

Ribbon cable 15-pin (PCB: 18 pads) PSA1 PCB

Ribbon cable 13-pin PSA1 PCB

 





PCB UNIT/MAIN



: Screw

– 10 –

CT-X870IN / VER.2

E. Removing the BACK LIGHT UNIT

MEMO: BACK LIGHT UNIT is confi gured with PSA1 PCB, PSA2 PCB, and backlight component.

E-1. Unsolder to disconnect the following cables.

NOTE: Release the cables from the clip.

MEMO: BACK LIGHT UNIT (PSA1 PCB, PSA2 PCB) can be removed without disconnecting

cable

, and cable , and cable .



Cable / Remarks Connected From







E-2. Undo 3 screw A and 1 screw B, and then remove the MDA1 PCB and FERRITE CORE (for

cable

FERRITE CORE

Ribbon cable 10-pin PSA1 PCB

Ribbon cable 15-pin (PCB: 18 pads) PSA1 PCB

Ribbon cable 13-pin PSA1 PCB

) from the PSA1 PCB.



Clip



MDA1





: Screw A : Screw B

– 11 –

E-3. Unsolder to disconnect the following cables.

MEMO: The lead wires are fi xed to the hole of PSA1 PCB with a cable tie.

Cable / Remarks Connected From

CT-X870IN / VER.2







2 lead wires From the left: White, green Left speaker

2 lead wires From the left: Black, red Battery springs

2 lead wires From the left: Blue, brown Right speaker

PSA2 PSA1







: Cable tie

– 12 –

CT-X870IN / VER.2

E-4. Undo 27 screws and then remove the BACK LIGHT UNIT (w/ FABRIC TAPE, PACKING,

KNOB, SPONGE (2 sheets)) , rubber keys (4 pcs.), and LCD.

MEMO: One screw is tightened with the clip.

NOTE: The LCD may be stuck on the BACK LIGHT UNIT.

Use caution when handling the BACK LIGHT UNIT to prevent the LCD from dropping.

E-5. Remove the KNOB from the PSA2 PCB.

PSA2 PSA1

: Screw

: Screw / Clip

LCDBACK LIGHT UNIT

A

D ECB

A: RUBBER BUTTON/A (for Power button)

B: KNOB

C: RUBBER BUTTON/A

– 13 –

D: RUBBER BUTTON/B

E: RUBBER BUTTON/C

CT-X870IN / VER.2

Notes on Assembly

• When replacing the BACK LIGHT UNIT, attach PACKING/10X30 to PSA1 PCB as shown in
the fi gure below.
* Attach tha packing in accordance with silk-printed solid line (square bracket x2).

– For protect the ribbon cable from lead frame of backlight LED protruding from PCB

PACKING/10X30Lead frame

• When attaching the KNOB, push it to the back surely.

– The gap between knob (convex part) and PCB should be less than 1 mm

Reference: When setting the nob to max. sound volume, min. sound volume, or medium

sound volume position, 1 mm gap gauge should not be inserted at each position.

• Before assembling the BACK LIGHT UNIT, check the ribbon cable of PSA2 PCB is parallel to
the PCB.
* If the ribbon cable is fl oating, it may interfere with the rotation of knob.

• Before assembling the LCD, check that the LCD surfaces on the main panel side and LCD
side are free from dust and dirt.

• Be sure that the LCD is in the correct orientation when assembling.

• Tighten the screws at LCD part in the silk-printed order.
If not tightened correctly, it may cause LCD display errors.

– 14 –

CT-X870IN / VER.2

• Arrange the ribbon cables of PSA1 PCB as shown in the fi gure below and fi x them with
sponge or fabric tape.

3-pin ribbon cable:



– Carry out the wire arrangement in such a way to fold the cable
– Fix the cable with SPONGE/20X40
* For the affi xing position of sponge, refer to the silk-printed solid line (square bracket)
* The sponge should not exist on the screw.

15-pin ribbon cable:



– Mountain-fold the cable in accordance with silk-printed dashed line (2 positions)
– Fix the cable with FABRIC TAPE/20X120
* For the affi xing position of fabric tape, refer to the edge surface of cable

10-pin ribbon cable:



– Accordion-fold the cable in accordance with silk-printed dashed line
– Fix the cable with SPONGE/20X80
* For the affi xing position of sponge, refer to the silk-printed solid line (center of 2 square

brackets).

* The sponge should not exist on the screw, screw hole (for ferrite core) and boss.

 

: Screw hole : Boss : Screw

– 15 –

CT-X870IN / VER.2

Y

Disassembly of the Backlight Block

(1) Remove the LCD (A).

(2) Peel off the SPONGE/8X75 (B), and then remove the TOP PIECE (C), FILM (D), BACK LIGHT

PLATE (E), and RUBBER CONNECTOR (2 pcs, F).

(3) Unhook the hook on the back surface of PSA1 PCB and remove the REFLECTOR (G).

NOTE: When removing the REFLECTOR, check hook and boss of REFLECTOR are

disengaged from the PCB.

NOTE: Remove the REFLECTOR not to apply load to LED as much as possible.

If the LED is bended, push the LED softly to adjust the position after the REFLECTOR
is attached.

B

C

A

D

: Hook : Boss

E

F

LED

G

LED

– 16 –

F. Removing the BENDER UNIT

F-1. Unsolder to disconnect the following cable.

Cable / Remarks Connected From

CT-X870IN / VER.2



Ribbon cable 3-pin MDA1 PCB

F-2. Undo 1 screw and remove the FERRITE CORE.

NOTE: Release the pitch bend cable from the cable tie and clip.

FERRITE CORE

Clip



: Cable tie : Screw

F-3. Undo 2 screws and remove the BENDER UNIT (w/ FERRITE CORE).

NOTE: Remove the pitch bend cable from the ribs of lower case and side panel.

BENDER UNIT

: Screw

: Boss

FERRITE CORE

– 17 –

CT-X870IN / VER.2

Notes on Assembly

• When replacing the BENDER UNIT, attach the FERRITE CORE to the cable as shown in the
fi gure above ( = 80mm).

* Wrap the cable around the FERRITE CORE once

• Arrange the pitch bend cable on the outside of the boss as shown in the fi gure above.
* The pitch bend cable, if arranged inside the boss, may interfere with the rotation of the pitch

bend

G. Removing the SPEAKER

G-1. Unsolder to disconnect the following cable.

NOTE: Remove the speaker cable from the ribs of lower case as necessary.

Cable / Remarks Connected From





G-2. Undo 4 screws and remove the SPEAKER.

<Left speaker> <Right speaker>

2 lead wires From the above: White, green PSA1 PCB

2 lead wires From the above: Brown, blue PSA1 PCB



: Screw : Screw

SPEAKER



Notes on Assembly

• Tighten the screws while pushing the speaker toward the arrow shown in the fi gure above.

– 18 –

H. Removing the KEY

H-1. Remove the main panel, left side panel, and right side panel.

For disassembly procedure, refer to the applicable section.

H-2. Undo 21 screws and then remove the WHITE KEY and BLACK KEY.

NOTE: When removing the KYA PCB, untie the KYA PCB cables (x2) and pitch bend cable.

CT-X870IN / VER.2

: Screw : Cable tie

Notes on Assembly

• After assembling the KEY, press the keys to check that the keys move smoothly.

– 19 –

CT-X870IN / VER.2

I. Removing the PCB UNIT/KEYBOARD/KYA

I-1. Unhook and remove the PCB UNIT/KEYBOARD/KYA (w/ RUBBER CONTACT/CB, RUBBER

CONTACT/CS).

I-2. Remove 4 RUBBER CONTACT/CB and RUBBER CONTACT/CS.

MEMO: The RUBBER CONTACT/CS diff ers from the others in length.

: Hook

PCB UNIT/KEYBOARD/KYA

KYA1 KYA2

Notes on Assembly

• To install the RUBBER CONTACT, lightly insert the
tip of a rubber into the PCB fi rst, and then press it in
using the end of a paper clip.
* Do not press with too much force. Doing so may

damage the rubber.

RUBBER CONTACT/CSRUBBER CONTACT/CB

– 20 –

• Arrange the KYA PCB cables as shown in the fi gure below.

Fold the edge of the cable toward the back

* The cable should not be higher than the PCB surface

Fold in half

CT-X870IN / VER.2

– 21 –

CT-X870IN / VER.1

FUNCTION TEST

1. Overview

Y

Test Items

To test this product, fi rst launch the built-in diagnostic program, and then perform the following tests in
sequence.

No. Item Necessary Items

A Button Test –

B Pitch Bend Test –

C LCD Test –

D Model Test –

E ROM Version Check –

F Pedal Test SP-3 or SP-20 pedal (sold separately)

G USB Test PC, USB cable

H USB Flash Drive Test USB fl ash drive

I RAM Test –

MEMO: Testing requires the AC adaptor or 6 AA-size dry batteries with enough capacity.

MEMO: For information about PC system requirements, refer to the User’s Guide.

MEMO: Be sure to use a USB fl ash drive formatted by the digital keyboard system.

For how to format the USB f ash drive, refer to the User’s Guide.

Y

Launching the Diagnostic Program

(1) Connect the AC adaptor or load the 6 AA-size dry batteries.

(2) Adjust the sound volume so that it is at about 1/3 of the full volume.

(3) While holding down [0], [1], and [3] buttons, turn on the power.

When the diagnostic program is launched, “SW” or “SW : 22” appears.

MEMO: If the buttons are pressed long, “SW: 22” may appear.

NOTE: Be sure to turn off the power when the test is fi nished.

To turn off the power, hold down [P] button until the screen shuts down.

– 1 –

2. Test Procedure

A. Button Test

NOTE: Check there is no uncomfortable feeling when pressing the button.

If the button gets lodged or does not return to the correct position, evaluate the test as NG.

A-1. Press the buttons in the sequence to check that the keys operate properly.

For the button sequence, refer to the following fi gure.

• OK: The confi rmation tone (cowbell) sounds, and “SW :” and “button number (XX)” appear.
When press the last button, the completion tone sounds, and “OK :” and “button
number (XX)” appear.

• NG: If the buttons are pressed in a wrong sequence, the error tone sounds, and “SW :” and
“button number (XX)” appear.

CT-X870IN / VER.1

Button number

<Sequence of the button to press / Button number>

START

167 146 147 148 111 108

121 122 123 124 125 130

80 82 83 88 90 91 92

93 64

50 52

62 23 24 25

170

10 19 13 12

END

26 27 28

20 21 22

A-2. Check that the following screen appears when you press the last button in the sequence.

– 2 –

CT-X870IN / VER.1

B. Pitch Bend Test

NOTE: Check that the pitch bend wheel rotates smoothly.

If you feel a catch in the pitch bend wheel or it does not rotate smoothly, evaluate the test
as NG.

B-1. Press [0] button to display the following screen.

B-2. Rotate the pitch bend wheel all the way up, and check that the following screen appears.

MEMO: The confi rmation tone (cowbell) sounds.

B-3. Return the pitch bend wheel to the original position.

B-4. Rotate the pitch bend wheel all the way down, and check that the following screen appears.

MEMO: The confi rmation tone (cowbell) sounds.

B-5. Return the pitch bend wheel to the original position, and check that the following screen

appears.

MEMO: The confi rmation tone (triangle) sounds.

– 3 –

C. LCD Test

C-1. Press [0] button to display the following screen.

C-2. Press [0] button and check that all segments are lit.

C-3. Press [0] button and check that all segments are turned off .

CT-X870IN / VER.1

D. Model Test

D-1. Press [0] button to display the following screen.

D-2. Press [0] button and check that the model name is “MX874B”.

– 4 –

E. ROM Version Check (This item is not an inspection)

E-1. Press [0] button to display the ROM version.

NOTE: The displayed ROM version may diff er depending on the individual products.

(The fi gure shown below indicates an example of display)

F. Pedal Test

NOTE: This test cannot be performed without a pedal.

F-1. Press [0] button to display the following screen.

CT-X870IN / VER.1

F-2. Connect the pedal to the PEDAL jack.

F-3. Press the pedal and check that the following screen appears.

F-4. Release the pedal and check that the following screen appears.

– 5 –

CT-X870IN / VER.1

G. USB Test

NOTE: This test cannot be performed without a PC and USB cable.

G-1. Connect the USB port of digital keyboard and PC with a USB cable, and then check that the

following screen appears.

G-2. Disconnect the USB cable from the digital keyboard and check that the following screen.

H. USB Flash Drive Test

NOTE: This test cannot be performed without a USB fl ash drive.

H-1. Insert a USB fl ash drive into the USB fl ash drive port and check that the following screen.

H-2. Press [0] button to display the following screen.

H-3. Press [0] button to begin the test and check that the screen changes as fi gure below.

– 6 –

CT-X870IN / VER.1

H-4. Remove the USB fl ash drive from the digital keyboard and check that the following screen.

– 7 –

I. RAM Test

I-1. Press [0] button to display the following screen.

I-2. Press [0] button to begin the test.

I-3. Check that the following screen.

CT-X870IN / VER.1

I-4. Turn off the power by holding down [P] button until the screen shuts down.

– 8 –

BLOCK AND WIRING DIAGRAM

CT-X870IN / VER.1

Keyboard PCB (KYA1)

CN801 (13-pin)

Main PCB
(MDA1)

VD5

Power Supply

Circuit

IC4, IC5

RESETB

CN5 (13-pin)

FI0-FI3,
KC0-KC4,
SI0-SI3

VD1.2

VD3

VDA3

CN803 (10-pin)

CN802 (10-pin)

CN804 (11-pin)

CN6 (11-pin)

DDR2 SDRAM

IC2

EEPROM

IC3

Keyboard PCB (KYA2)

KC5-KC7,
FI4-FI7,
SI4-SI7

MA0-MA12

MD0-MD15

NFD0-NFD7

MPU

IC1

USB-A

(CN10)

PITCH BEND

USB-B
(CN11)

CN12 (3-pin)

CN22 (13-pin)

CN523 (13-pin)

Button

Power Amp PCB
(PSA1)

KC0-KC7,
KI0-KI2,
SFI0, SF1

CN517

LCD

CN518

PWM, RS,
R/W, E,
DB4-DB7

CN30 (10-pin)

CN519 (10-pin)

LCD

Controller

IC506

PWSW

Power switch

VCP

APO

Power Supply

Circuit
IC504

Filter

IC7

VD5 VA5

LOUT ROUT

CN14 (15-pin)

CN521 (15-pin)

PEDAL

BATT SP_MUTE

VA3

VD5

VA5

VE5

VCP

GND GND GND

CN511

CN512

SPMUTE

CN505CN508

Power

Amplifier

IC501

LLR

R

CN513CN514

ADC
IC11

AUDIO_IN_L AUDIO_IN_R VOL

Filter

IC502

LR

VVOL

(VDA3)

CN504 (3-pin)

CN601 (3-pin)

VOLUME

(VR601)

Volume PCB
(PSA2)

Battery

– 1 –

DC

(J502)

PEDAL

(J504)

SPEAKER (L)

PHONES

(J501)

AUDIO IN

(J503)

SPEAKER (R)

CIRCUIT DESCRIPTION

Y

Nomenclature of Keys

Y

Key Matrix

Each key has two contacts, the fi rst contact  and second contact .

NOTE: The diagram below illustrates how the contacts work.

CT-X870IN / VER.1

KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7

FI0 C2

SI0 C2

FI1 G2#

SI1 G2#

FI2 E3

SI2 E3

FI3 C4

SI3 C4

FI4 G4#



















Second contact

C2#

C2#

A2

A2

F3

F3

C4#

C4#

A4



















D2

D2

A2#

A2#

F3#

F3#

D4

D4

A4#





















Key

D2#

D2#

B2

B2

G3

G3

D4#

D4#

B4

First contact



















E2

E2

C3

C3

G3#

G3#

E4

E4

C5





















F2

F2

C3#

C3#

A3

A3

F4

F4

C5#

FI

KC

SI



















F2#

F2#

D3

D3

A3#

A3#

F4#

F4#

D5



















G2

G2

D3#

D3#

B3

B3

G4

G4

D5#



















SI4 G4#

FI5 E5

SI5 E5

FI6 C6

SI6 C6

FI7 G6#

SI7 G6#















A4

F5

F5

C6#

C6#

A6

A6















A4#

F5#

F5#

D6

D6

A6#

A6#















B4

G5

G5

D6#

D6#

B6

B6

– 2 –















C5

G5#

G5#

E6

E6

C7

C7















C5#

A5

A5

F6

F6











D5

A5#

A5#

F6#

F6#











D5#

B5

B5

G6

G6











Y

Button Matrix

CT-X870IN / VER.1

KI0 KI1 KI2 SFI0 SFI1

KC0

[ACCOMP],

KC1 TONE

KC2

KC3

KC4

KC5

KC6 TEMPO/TAP 0257

KC7 –3689

PIANO/ORGAN,

$

TOUCH

SPLIT,

$

POINT

Area 1,

LISTEN

METRONOME,

$

BEAT

PART SELECT,

$

MUSIC PRESET

CATEGORY SONG BANK RECORD/STOP RHYTHM

EASY MODE, BANK,

$

FREEZE

Area 2,

WATCH

+ FUNCTION 1 4

INTRO,

REPEAT

ENDING/

SYNCHRO START,

d

FF

LAYER,

$

OCTAVE

Area 3,

REMEMBER

VAR. FILL-IN,

s

REW

START/STOP,

PLAY/STOP

A.HAR./ARPEG.,

$

TYPE

Area 4,

PHRASE

NORMAL FILL-IN,

A-B

SYNCHRO STOP,

k

PAUSE

STORE

CHORD MODE,

$

CHORD BOOK

– 3 –

Main PCB: M870-MDA1

CT-X870IN / VER.1

PRINTED CIRCUIT BOARDSPRINTED CIRCUIT BOARDS

– 4 –

CT-X870IN / VER.1

Power Amp PCB: M870-PSA1 Volume PCB: M870-PSA2

– 5 –

Keyboard PCB: M802-KYA1

CT-X870IN / VER.1

Keyboard PCB: M802-KYA2

– 6 –

Main PCB: M870-MDA1 (1/2)

CT-X870IN / VER.1

SCHEMATIC DIAGRAMS

Î PSA1/CN519

USB-B
(CN11)

USB-A

(CN10)

Î PSA1/CN523

KYA1/CN801 Í

KYA2/CN804 Í

Not used

– 7 –

Main PCB: M870-MDA1 (2/2)

CT-X870IN / VER.1

Î PSA1/CN521

Not used

– 8 –

Power Amp PCB: M870-PSA1 (1/2)

CT-X870IN / VER.1

PHONES

(J501)

DC

(J502)

AUDIO IN

(J503)

PEDAL

(J504)

Î PSA2/CN601

Î SPEAKR (L)

Î BATTERY

Î MDA1/CN14

Î SPEAKR (R)

SPEAKR (L)

BATTERY

SPEAKR (R)

Not used

– 9 –

Power Amp PCB: M870-PSA1 (2/2) Volume PCB: M870-PSA2

Î MDA1/CN30

CT-X870IN / VER.1

VOLUME

(VR601)

Î LCD

Î LCD

Î MDA1/CN22

Î PSA1/CN504

– 10 –

Not used

Keyboard PCB: M802-KYA1

CT-X870IN / VER.1

Î MDA1/CN5 Î KYA2/CN803

– 11 –

Keyboard PCB: M802-KYA2

CT-X870IN / VER.1

Î KYA1/CN802 Î MDA1/CN6

– 12 –

CT-X870IN / VER.2

Main Unit

N 1 10568212 DISPLAY PLATE RJM516224-003V02 1 X
N 2 10563768 SPONGE/50X260 RJM516354-001V01 1 X for Wires

3 10517162 SCREW RJM514943-001V01 17 X
4 10521852 LOWER COVER/A RJM508655-001V05 1 X
5 10521853 LOWER COVER/B RJM508656-001V05 1 X
6 10521854 LOWER COVER/C RJM508657-001V05 1 X

S4 10203788 SCREW S-WLB0-4X10Z3NQ 2 X

Main Panel

N 7 10558735 PLATE RJM516106-002V01 1 X
N 8 10540407 FABRIC TAPE/5X45 RJM515372-001V01 3 X
N 9 10564562 CASE/PANEL RJM516103-004V01 1 X

10 10136565 PACKING/8X510 M441190-002V01 1 X

N 11 10563769 SHEET/V-ZERO RJM516425-001V01 1 X

12 69210550 FABRIC TAPE/5X13 M412026-1 2 X
N 13 10568196 SHEET/V-ZERO RJM516523-001V01 1 X
N 14 10567929 LCD UNC-LTNN014320-02 1 X
N 15 10558740 RUBBER BUTTON/C RJM516089-002V01 1 X
N 16 10558739 RUBBER BUTTON/B RJM516088-002V01 1 X
N 17 10558738 RUBBER BUTTON/A RJM516087-002V01 1 X
N 18 10564553 RUBBER BUTTON/A RJM511139-007V01 1 X Power button

19 10553264 KNOB/for ROTARY RJM515607-001V01 1 C
N 20 10566275 BACK LIGHT UNIT TK-RJM516205*003 1 X PSA1/PSA2

21 10270485 SPONGE/8X75 M441167-001V01 1 X

22 10131094 TOP PIECE RJM502565-001V01 1 X
N 23 10559870 FILM RJM516225-001V01 1 X
N 24 10557981 BACK LIGHT PLATE RJM516108-001V01 1 X
N 25 10559868 RUBBER CONNECTOR/for LCD RJM516226-001V01 2 X
N 26 10557978 REFLECTOR RJM516107-001V01 1 X

J502 10537493 JACK/DC KM02007P 1 A DC terminal
J501 10478582 JACK/PHONE PJ-64017A-PBTV0 1 B PHONES jack
J504 10490438 JACK/SUSTAIN PJ-64043B-PBTV0 1 C PEDAL jack
J503 10305131 JACK/AUDIO IN ST-3529B 1 B AUDIO IN jack

VR601 10554608 VARIABLE RESISTOR F-09KH1-CASIO-3 1 B Volume

27 10204256 FERRITE CORE TRCN16-13 1 X for Bender cable

28 10048978 SPONGE/20X80 M440721-1 1 X for Ribbon cable

29 10164446 FABRIC TAPE/20X120 RJM502073-002V01 1 X for Ribbon cable

30 10139463 PACKING/10X30 RJM503575-001V01 1 X for LED leads

31 10127790 SPONGE/20X40 RJM503059-001V02 1 X for Ribbon cable
N 32 10573314 PCB UNIT/MAIN TK-RJM516571*001 1 A MDA1

CN10 10432772 USB CONNECTOR (type A) UAR27-4K5J00 1 C USB-A port
CN11 10236624 USB CONNECTOR (type B) UBR24-4K5G00 1 C USB-B port

N 33 10517163 SCREW RJM514945-001V01 3 X

67 10609381 SHEET/V-ZERO RJM517844-001V01 2 B Spacer*

* For some models only (refer to DISASSEMBLY/ASSEMBLY Page 5)

R

Remarks

N

Item

Code No.

Parts Name

Specification

Q'ty

EXPLODED VIEW PARTS LIST

CT-X870IN_DI

1

S4

S4

2

47

43

45

2

x17

x17

3

3

6

6

5

5

34

35

36

x7

37

38

39

40

36

x4

42

44

x7

46

44

x4

48

4

4

41

* For some models only

(refer to DISASSEMBLY/ASSEMBLY page 5)

9

10

13

14

18

19

22

31

12

x3

30

67 x2

7

8

11

12

15

16

17

21

20

23

24

x2

25

26

28

27

29

33

32

x3

<Notes>
Price Code : Refer the latest “Parts Price Code” at “PARTS FINDER” on the Casio Service Website (https://www.servicecasio.com).

N : New parts
Q’ty : Quantity used per unit
R : Rank (A: Essential, B: Stock recommended, C: Others, X: No stock recommended)

– 1 –

CT-X870IN / VER.2

R

Remarks

N

Item

Code No.

Parts Name

Specification

Q'ty

Right Panel

N 34 10566331 SPEAKER COVER/RIGHT RJM516119*002V02 1 X
N 35 10558742 SIDE PANEL/RIGHT RJM516105-002V01 1 X
N 36 10517163 SCREW RJM514945-001V01 11 X
N 37 10537088 FABRIC TAPE/20X10 M411742-004V01 1 X

38 10472328 SPEAKER CJ12FD02 1 X

39 10377007 W IRE 1007TASC24850B3030 1 X Blue

40 10377008 W IRE 1007TASC24850T3030 1 X Brown

Left Panel

N 41 10566329 SPEAKER COVER/LEFT RJM516118*002V02 1 X
N 42 10564563 SIDE PANEL/LEFT RJM516104-003V01 1 X
N 43 10566277 BENDER UNIT TK-RJM516439*001 1 C Pitch bend
N 44 10517163 SCREW RJM514945-001V01 11 X
N 45 10537088 FABRIC TAPE/20X10 M411742-004V01 1 X

46 10472328 SPEAKER CJ12FD02 1 X
N 47 10564948 W IRE 1007TASC24500W3030 1 X White
N 48 10564947 W IRE 1007TASC24500G3030 1 X Green

EXPLODED VIEW PARTS LIST

CT-X870IN_DI

1

S4

S4

67 x2

* For some models only

(refer to DISASSEMBLY/ASSEMBLY page 5)

2

2

7

8

x3

9

11

10

x17

x17

3

3

6

6

13

18

14

12

12

15

16

5

5

17

19

4

4

21

20

23

22

41

42

44

x7

46

44

x4

48

47

43

36

x7

45

39

40

36

34

38

x4

35

37

31

30

29

24

25

26

27

33

x2

28

32

x3

– 2 –

49

R

Remarks

N

Item

Code No.

Parts Name

Specification

Q'ty

Main Case Unit

49 10399802 W HITE KEY/CB RJM507243*004V03 4 B

50 10399803 W HITE KEY/CS RJM507244*004V03 1 C

51 10406652 BLACK KEY/10p RJM506595-005V03 2 B

52 10406653 BLACK KEY/5p RJM506595-006V03 1 B

53 10269451 RUBBER CONTACT/CB RJM507656-001V01 4 B

54 10452739 RUBBER CONTACT/CS RJM507657-001V02 1 C

55 10313200 PCB UNIT/KEYBOARD/KYA TK-RJM508618*002 1 C KYA1/KYA2
N 56 10560275 CASE UNIT/MAIN TK-RJM516221*002 1 X

57 10513861 FELT/LOWER LIMIT/KEYBOARD RJM508593-001V03 1 X

58 10513862 FELT/DAMPER/KEYBOARD RJM509138-001V02 1 X

59 10284332 BRACKET/for STAND M440866-001V02 2 X

60 10513859 FELT/UPPER LIMIT/KEYBOARD M440342-001V04 1 X
N 61 10555159 RUBBER FOOT RJM515614-006V01 4 X

62 69271070 BATTERY TERMINAL/B M440677-1 3 X

63 10400576 BATTERY TERMINAL/+ RJM511046-001V01 1 X

64 69271060 BATTERY TERMINAL/A M440676-1 2 X

65 10380432 BATTERY TERMINAL/- M440002-001V03 1 X
N 66 10560276 COVER UNIT/BATTERY TK-RJM516219*002 1 X

Accessory

N - 10558733 MUSIC STAND RJM516109-002V01 1 C

CT-X870IN / VER.2

EXPLODED VIEW PARTS LIST

CT-X870IN_DI

50

52

51

54

55

53

56

58

57

59

x2

65

62

66

64

63

60

61

x4

– 3 –

SPECIFICATIONS

CT-X870IN / VER.1

Keyboard

Touch Response

61 standard size keys

3 types, Off

Maximum Polyphony 48 notes (24 for certain tones)

Tones

Built-in Tones

Functions

600

Layer, Split, Piano/Organ button

Reverb 1 to 20, Off

Chorus 1 to 10, Tone

Metronome

Beats per Measure

Tempo Range

0 to 9

20 to 255

Song Bank

Demo Song

Built-in Songs

User Songs

User-recorded songs

1

160

1

10*

6 (Refer “Recorder” below.)*

1

Step Up Lesson

Lessons

Lesson Part

Functions

3 (Listen, Watch, Remember), Easy Mode

L, R, LR

Repeat, Voice Fingering Guide, Note Guide, Performance Evaluation

Auto Accompaniment

Built-in Rhythms

User Rhythms

195

10*

2

Chord Book Function Chord guide

Registration 32 (4 setups × 8 banks)

Recorder

Keyboard Play

Real-time recording, playback

5 songs, 6 tracks

Playing Along with
a Built-in Songs

Memory Capacity

1 song (L, R, LR)

Approximately 40,000 notes (1 song)

Other Functions

Transpose

Octave Shift

Tuning

Preset Scales

Music Preset

One Touch Preset

Auto Harmonize

Arpeggiator

±1 octaves (–12 to +12 semitones)

Upper 1/Upper 2/Lower, ±3 octaves

A4 = 415.5 to 465.9 Hz (Initial Default: 440.0 Hz)

17

310

195

12 types

100 types

MIDI 16 multi-timbre received, GM Level 1 standard

– 1 –

CT-X870IN / VER.1

Musical Information Function Tone, Rhythm, Song Bank numbers and names, staff notation,

fi ngering, pedal operation, tempo, measure and beat number,
chord name, etc.

Pitch Bend Wheel Pitch Bend Range 0 to 24 semitones

USB Flash Drive SMF direct playback, data storage, data loading, data deleting,

USB fl ash drive format

Inputs/Outputs

USB fl ash drive port

USB port

PEDAL jack

Phones/Output jack

Audio In jack

Power Jack DC 9.5 V

TYPE A

TYPE B

Standard jack (6.3mm): sustain, sostenuto, soft, rhythm

Stereo standard jack (6.3mm)
Output Impedance: 167 Ω, Output Voltage: 4.5 V (RMS) MAX

Stereo mini jack (3.5mm)
Input Impedance: 10 kΩ, Input Sensitivity: 200 mV

Power Supply

Batteries

Battery Life

AC Adaptor

Auto Power Off

2-way

6 AA-size alkaline batteries

Approximately 3 hours continuous operation on alkaline batteries

AD-E95100L

Approximately 30 minutes after last operation; Can be disabled.

Speakers 12 cm × 2 (Output: 2.5 W + 2.5 W)

Power Consumption 9.5 V = 7.5 W

5

Dimensions 94.8 × 35.0 × 10.9 cm (37

/16 × 13 3/4 × 4 5/16 inch)

Weight Approximately 4.4 kg (9.7 lbs) (without batteries)

*1 Maximum capacity per song: Approximately 320 kilobytes

*2 Maximum capacity per rhythm: Approximately 64 kilobytes (1 kilobyte = 1,024 bytes)

– 2 –