casio AP-700 Service Manual

AP-700

SEP. 2015

Ver. 2 : Mar. 2016

AP-700

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

BLOCK AND WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

CIRCUIT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

PRINTED CIRCUIT BOARDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

DIAGNOSTIC PROGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

AP-700

SPECIFICATIONS

Keyboard 88-key piano keyboard

• Layer, Split

• Duet: Adjustable tone range (–2 to +2 octaves)

• Transpose: 2 octaves (–12 to 0 to +12)

• Octave shift: 4 octaves (–2 to 0 to +2)

Sound Source • Number of Tones: 26

• Maximum polyphony: 256 tones

• Touch Response (3 sensitivity levels, Off)

• Tuning: 415.5 Hz to 440.0 Hz to 465.9 Hz (0.1 Hz units)

• Temperament: Equal temperaments plus 16 other types

• Stretch Tuning: 5 types, Off, Auto Setting

Acoustic Simulator Damper Resonance, Damper noise, Hammer response,

String resonance, Lid simulator

Effects Brilliance (–3 to 0 to 3), Hall simulator (6 types), Chorus (4 types),

DSP, Headphone mode, Volume sync equalizer (3 types, Off)

Concert Play • Number of Songs: 15

• Playback of Concert Play songs obtained with a computer, etc.

• Song volume: Adjustable

• Playback at 80 % of normal tempo

• 2 Modes: LISTEN, PLAY

Music Library • Number of Songs: 60, User Songs: 10 (Up to approximately 90

KB per song, approximately 900 KB for 10 songs)* * Based on 1 KB = 1024 bytes, 1 MB = 1024

• Song volume: Adjustable

• Part On/Off: L, R

Grand Piano Demo Song 6

MIDI Recorder • Functions: Real-time recording, playback

• Number of Song: 1

• Number of Tracks: 2

• Capacity: Approximately 5,000 notes total

• Recorded Data Protection: Built-in ﬂ ash memory

• MIDI Recorder Volume Level: Adjustable

Audio Recorder • Real-time recording and playback to USB ﬂ ash drive*

* Linear PCM, 16bit, 44.1 kHz, stereo .WAV format

• Songs: 99 ﬁ les

• Approximately 25 minutes maximum recording per ﬁ le.

• Audio Recorder Volume Level: Adjustable

bytes

Metronome • Beats: 0 to 9

• Tempo Range: 20 to 255

• Metronome Volume Level: Adjustable

Pedals Damper (with half-pedal operation), Soft, Sostenuto

– 1 –

Other Functions • Setting backup

• Operation Lock

MIDI 16-channel multi-timbre receive

USB Flash Drive • Capacity: 32 GB or less recommended

• SMF direct playback, data storage, data loading, USB ﬂ ash drive format, audio data playback and storage

Inputs/Outputs • PHONES jacks: Stereo standard jacks × 2

• Power: 24 V DC

• MIDI OUT/IN terminals

• LINE IN R, L/MONO jacks: Standard jacks × 2

Input impedance: 9.0 KΩ Input voltage: 200 mV

• LINE OUT R, L/MONO jacks: Standard jacks × 2

Output impedance: 2.3 KΩ Output voltage: 1.8 V (RMS) MAX

• USB port: Type B

• USB ﬂ ash drive port: Type A

• Pedal connector

AP-700

Speakers

12 cm × 4 + φ5 cm × 2 (Output 30 W + 30 W)

Power Requirements AC Adaptor: AD-E24500LW

• Auto Power Off: Approximately 4 hours after last operation. Auto Power Off can be disabled.

Power Consumption 24 V = 28 W

Dimensions Digital Piano and Stand:

137.7 (W) × 42.7 (D) × 91.1 (H) cm (54

/4 × 16

/16

× 35 7/8 inch)

Weight Digital Piano and Stand: approximately 48.0 kg (105.8 lbs)

– 2 –

BLOCK AND WIRING DIAGRAM

KEYBOARD PCB (M920-KYA1) KEYBOARD PCB (M920-KYB1) KEYBOARD PCB (M920-KYC1)

MAIN PCB (M936-MDA1)

Power Supply Circuit

IC3, IC4, IC10,

C144~C149,

C152~154, C158

Schmitt

VD5 VA12 VA5 VDP3

VD5 VA12 VA5 VDP3 VH5 VA3

Power Supply Circuit

IC1, IC2, IC5~IC7, C55, C56,

C58~C63, C65~C69,

C122, C123, C185, D6, D7

VC PVCC

DC (J1)

Trigger

IC7

CN16 (13 pin)

CN10 (13 pin)

APO

POWER

PHONES

POWER AMP PCB (M936-PSA1)

CN801 (17 pin)

VD18

VD1

VD3

APO

LAMP

(J702)

(J701)

CN802 (17 pin)

KI0~KI21, KS0~KS2, KB0~KB3

USB (CN13)

HPDT, HPMUTE, SPMUTE

Filter IC14

Headphones

Amplifier

IC8

VD5

CN7 (7 pin)

CN701 (7 pin)

PHONES PCB

(M920-HPA1)

Power

Amplifier

IC4

CN803 (30 pin)

DAC

IC6

Filter IC16

CN5 (2 pin)

CN4 (2 pin)

CN3 (2 pin)

CN2 (2 pin)

CN804 (17 pin)

CN3 (30 pin)

MPU

IC9

ADC

IC5

CN24 (5 pin)

CN13 (5 pin)

Filter IC10

TWEETER (R)

TWEETER (L)

CN805 (17 pin)

CN8 (5 pin)

Control Signal

LINE PCB (M921-JKA1)

LINE OUT R (J506), L/MONO (J505) LINE IN R (J504), L/MONO (J503)

CN502 (5 pin)

CN14 (5 pin)

SPEAKERS (R)

CN605 (3 pin)

SPEAKERS (L)

CONSOLE PCB (M921-CNA3)

USB (CN12)

DA0~DA13

DQ0~DQ15

RD0~RD7

VOLUME (VR602)

PEDAL CONNECTOR

DDR2 SDRAM

IC8

EEPROM

IC2

RSTB, SIN1, SOUT1, VOLPWSW

CN25 (9 pin)

CN3 (9 pin)

PWSW, VOL

KC0~KC4, LEC0~LEC2, KI4~KI7, LES6~LES10

Button/LED/LCD

Controller

IC1

LES0~LES5, KC0~KC4

LEC0~LEC2, KI0~KI3

LCD PCB (M921-LCA1)

CN603 (11 pin)CN604 (3 pin)

SW600

CONSOLE PCB (M921-CNA1)

CN301 (4 pin)

CN5 (4 pin)

CONSOLE PCB (M921-CNA2)

SW621~SW638SW621~SW638

LCD Driver

IC2

CN4 (11 pin)

AP-700

MIDI (CN302)

MIDI PCB

(M921-CNA4)

CN602 (17 pin)

CN2 (17 pin)

LCD

CN1 (11 pin)

CN601 (11 pin)

SW601~SW620

– 3 –

AP-700

CIRCUIT DESCRIPTION

Nomenclature of Keys

A0# 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# F7# G7# A7#

A0 B0 C1 D1 E1 F1 G1 A1 B1 C2 D2 E2 F2 G2 A2 B2 C3 D3 E3 F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6 D6 E6 F6 G6 A6 B6 C7 D7 E7 F7 G7 A7 B7 C8

Key Matrix

Each key has three contacts, the ﬁ rst contact , second contact  and third contact .

[NOTE] The diagram below illustrates how the contacts work.

KI0

KI1

KB (0-3)

KS0

KS1

KS2

First contact 

Second contact 

Third contact 

KI (0-21)

KS0 KS1 KS2 KS0 KS1 KS2

A0#

C1#

D1#



(KB0) A0

(KB1) A0#

(KB2) B0

(KB3) C1

(KB0) C1#

(KB1) D1

(KB2) D1#

(KB3) E1

(KB0) A0



(KB1) A0#



(KB2) B0



(KB3) C1



(KB0) C1#



(KB1) D1



(KB2) D1#



(KB3) E1



(KB0)



(KB1) F4#



(KB2) G4



(KB3) G4#



(KB0)



(KB1) A4#



(KB2) B4



(KB3) C5



KI11

KI12

(KB0) F4



(KB1) F4#



(KB2) G4



(KB3) G4#



(KB0) A4



(KB1) A4#



(KB2) B4



(KB3) C5



(KB0) F4



(KB1) F4#



(KB2) G4



(KB3) G4#



(KB0) A4



(KB1) A4#



(KB2) B4



(KB3) C5





(KB0)

(KB1)

(KB2)

(KB3)

(KB0)

(KB1)

(KB2)

(KB3)

– 4 –

KI2

KI3

KI4

KI5

KI6

KI7

KI8

KI9

KI10

KS0 KS1 KS2 KS0 KS1 KS2

F1#

G1#

A1#

C2#

D2#

F2#

G2#

A2#

C3#

D3#

F3#

G3#

A3#

C4#

D4#



(KB0) F1

(KB1) F1#

(KB2) G1

(KB3) G1#

(KB0) A1

(KB1) A1#

(KB2) B1

(KB3) C2

(KB0) C2#

(KB1) D2

(KB2) D2#

(KB3) E2

(KB0) F2

(KB1) F2#

(KB2) G2

(KB3) G2#

(KB0) A2

(KB1) A2#

(KB2) B2

(KB3) C3

(KB0) C3#

(KB1) D3

(KB2) D3#

(KB3) E3

(KB0) F3

(KB1) F3#

(KB2) G3

(KB3) G3#

(KB0) A3

(KB1) A3#

(KB2) B3

(KB3) C4

(KB0) C4#

(KB1) D4

(KB2) D4#

(KB3) E4

(KB0) F1



(KB1) F1#



(KB2) G1



(KB3) G1#



(KB0) A1



(KB1) A1#



(KB2) B1



(KB3) C2



(KB0) C2#



(KB1) D2



(KB2) D2#



(KB3) E2



(KB0) F2



(KB1) F2#



(KB2) G2



(KB3) G2#



(KB0) A2



(KB1) A2#



(KB2) B2



(KB3) C3



(KB0) C3#



(KB1) D3



(KB2) D3#



(KB3) E3



(KB0) F3



(KB1) F3#



(KB2) G3



(KB3) G3#



(KB0) A3



(KB1) A3#



(KB2) B3



(KB3) C4



(KB0) C4#



(KB1) D4



(KB2) D4#



(KB3) E4



(KB0)



(KB1) D5



(KB2) D5#



(KB3) E5



(KB0)



(KB1) F5#



(KB2) G5



(KB3) G5#



(KB0)



(KB1) A5#



(KB2) B5



(KB3) C6



(KB0)



(KB1) D6



(KB2) D6#



(KB3) E6



(KB0)



(KB1) F6#



(KB2) G6



(KB3) G6#



(KB0)



(KB1) A6#



(KB2) B6



(KB3) C7



(KB0)



(KB1) D7



(KB2) D7#



(KB3) E7



(KB0)



(KB1) F7#



(KB2) G7



(KB3) G7#



(KB0)



(KB1) A7#



(KB2) B7



(KB3) C8



KI13

KI14

KI15

KI16

KI17

KI18

KI19

KI20

KI21

C5#



(KB1) D5



(KB3) E5



(KB0) F5



(KB2) G5



(KB0) A5



(KB2) B5



(KB3) C6



C6#



(KB1) D6



(KB3) E6



(KB0) F6



(KB2) G6



(KB0) A6



(KB2) B6



(KB3) C7



C7#



(KB1) D7



(KB3) E7



(KB0) F7



(KB2) G7



(KB0) A7



(KB2) B7



(KB3) C8



(KB0) C5#

(KB2) D5#

(KB1) F5#

(KB3) G5#

(KB1) A5#

(KB0) C6#

(KB2) D6#

(KB1) F6#

(KB3) G6#

(KB1) A6#

(KB0) C7#

(KB2) D7#

(KB1) F7#

(KB3) G7#

(KB1) A7#

(KB0) C5#



(KB1) D5



(KB2) D5#



(KB3) E5



(KB0) F5



(KB1) F5#



(KB2) G5



(KB3) G5#



(KB0) A5



(KB1) A5#



(KB2) B5



(KB3) C6



(KB0) C6#



(KB1) D6



(KB2) D6#



(KB3) E6



(KB0) F6



(KB1) F6#



(KB2) G6



(KB3) G6#



(KB0) A6



(KB1) A6#



(KB2) B6



(KB3) C7



(KB0) C7#



(KB1) D7



(KB2) D7#



(KB3) E7



(KB0) F7



(KB1) F7#



(KB2) G7



(KB3) G7#



(KB0) A7



(KB1) A7#



(KB2) B7



(KB3) C8



AP-700

(KB0)



(KB1)



(KB2)



(KB3)



(KB0)



(KB1)



(KB2)



(KB3)



(KB0)



(KB1)



(KB2)



(KB3)



(KB0)



(KB1)



(KB2)



(KB3)



(KB0)



(KB1)



(KB2)



(KB3)



(KB0)



(KB1)



(KB2)



(KB3)



(KB0)



(KB1)



(KB2)



(KB3)



(KB0)



(KB1)



(KB2)



(KB3)



(KB0)



(KB1)



(KB2)



(KB3)



– 5 –

Button Matrix

AP-700

KC0 KC1 KC2 KC3 KC4

KI0 DUET

KI1 SETTING REPEAT



KI2

KI3

KI4 EXIT SALON

KI5 ROOM

KI6 ENTER METRONOME BRILLIANCE

KI7

(Start/Pause)

ELECTRIC

PIANO

FRENCH

CATHEDRAL

OPERATION

LOCK

HARPSI./VIB.

REC STRINGS SONG BASS

(Arrow)

LAYER

(Rewind)

BERLIN GRAND

CONCERT

PLAY

(Arrow)

DUTCH

CHURCH

TEMPO

HAMBURG

GRAND

(Fast forward)

ORGAN VOLUME

STANDARD

HALL

(Arrow)

TEMPO

USB

(Stop)

VIENNA GRAND

(Arrow)

BERLIN

HALL

– 6 –

PRINTED CIRCUIT BOARDS

Main PCB: M936-MDA1 Power Amp PCB: M936-PSA1

AP-700

LCD PCB: M921-LCA1

– 7 –

Console PCB: M921-CNA1 Console PCB: M921-CNA3

MIDI PCB: M921-CNA4

AP-700

Console PCB: M921-CNA2

Line PCB: M921-JKA1

– 8 –

AP-700

Phones PCB: M920-HPA1

Keyboard PCB: M920-KYA1

Pedal PCB: M332-PDA1 Pedal PCB: M332-PDA2

– 9 –

Keyboard PCB: M920-KYB1

AP-700

Keyboard PCB: M920-KYC1

– 10 –

DISASSEMBLY

About Repair

• The photos show a prototype, so the appearance of parts may slightly differ 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.

AP-700

• 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.

Before Starting Repair or Servicing

• Remove the AC adaptor, AC cord or batteries.

• Remove accessories such as the music stand.

– 11 –

AP-700

Disassembly Procedures

Flowchart

[NOTE] Some of the major components may be removed/replaced without removing the piano unit

from the stand. Remove the piano unit from the stand as necessary according to the work environment and with due consideration for safety.

Assembled Product

A. Pedal Unit

B. Stand

F. BOX/PCB

C. TOP BOARD UNIT2, TOP BOARD UNIT1

E. KEY COVER UNIT

The piano unit must be removed from

the stand when performing a repair.

P. SIDE BOARD

K. Console Unit

G. PCB UNIT/MAIN

H. PCB UNIT/POWER & AMP

I. PCB UNIT/JKA1

J. PCB UNIT/CNA4

Q. SIDE RACK UNIT

R. FRONT BOARD UNIT

S. PCB UNIT/HPA1

D. BOARD UNIT/TSP, SCORE BASE UNIT

L. PCB UNIT/CNA1

U. KEYBOARD UNIT

T. SPEAKER

Disassembly of the KEYBOARD UNIT

M. PCB UNIT/CNA2

N. BACK LIGHT UNIT

O. TWEETER

A. KEY

B. HAMMER

C. PCB UNIT/KY AND RUBBER CONTACT

– 12 –

A. Remove the Pedal Unit

A-1. Disconnect the pedal connector from the piano unit.

Clip

A-2. Undo six screws on the back surface.

AP-700

Pedal connector

A-3. Undo four screws.

: Screw

– 13 –

A-4. Remove the PEDAL BOARD UNIT.

[NOTE] The piano unit and stand become slightly unstable when the PEDAL

removed. Use caution so that the piano unit doesn’t fall or the stand doesn’t fall over.

PEDAL BOARD UNIT

A-5. Turn the ADJUSTER to remove it.

ADJUSTER

AP-700

BOARD UNIT is

Notes on Assembly

• Be sure to adjust the ADJUSTER height.

[NOTE] The pedal unit may be damaged if the pedal is operated without height adjustment.

– 14 –

A-6. Undo eight screws and remove the PEDAL UNIT.

: Screw

PEDAL UNIT

Notes on Assembly

• Tighten the screws for the PEDAL UNIT in the order of the numbers shown below.

AP-700

7 8

– 15 –

B. Remove the Stand

[NOTE] Disassembling or assembling the stand must be done by two or more people.

[NOTE] When disassembling or assembling, take precautions, such as closing the key cover and

tape it closed, so as not to get a hand caught.

B-1. Disconnect the pedal connector from the piano unit.

Pedal connector

Clip

AP-700

B-2. Undo one screw and remove the

Headphones hook

B-3. Undo four screws on the bottom surface.

headphones hook

– 16 –

B-4. Place the piano unit on the ﬂ oor.

[NOTE] Please do so with the key cover closed.

Back surface

B-5. Undo eight screws on the back surface and remove the BACK BOARD.

[NOTE] There are two types of screws. Be sure to use the correct screw when reassembling.

BACK BOARD

AP-700

B-6. Undo four screws and remove the SIDE BOARD UNIT/LEFT, SIDE BOARD UNIT/RIGHT, and

PEDAL BOARD UNIT.

SIDE BOARD UNIT/LEFT

PEDAL BOARD UNIT

SIDE BOARD UNIT/RIGHT

– 17 –

C. Remove the TOP BOARD UNIT2, TOP BOARD UNIT1

C-1. Close the piano lid and undo six screws.

C-2. Lift the TOP BOARD UNIT2.

AP-700

: Screw

TOP BOARD UNIT2

C-3. Undo two screws and remove the BRACKET and TOP BOARD UNIT2.

BRACKET

: Screw

– 18 –

Notes on Assembly

• Assemble the TOP BOARD UNIT 2 so that its spring ﬁ ts securely into the plate of the TOP BOARD UNIT 1.

C-4. Slide the TOP BOARD UNIT1 to remove it.

AP-700

TOP BOARD UNIT1

Notes on Assembly

• Assemble the TOP BOARD UNIT1 so that the brackets on the TOP BOARD UNIT1 and those on the main case ﬁ t.

– 19 –

D. Remove the BOARD UNIT/TSP, SCORE BASE UNIT

D-1. Undo 13 screws and remove the BOARD UNIT/TSP.

[NOTE] There are two types of screws. Be sure to use the correct screw when reassembling.

: Screw A

: Screw B

AP-700

BOARD UNIT/TSP

D-2. Undo ﬁ ve screws.

: Screw B

: Screw

– 20 –

D-3. Undo six screws.

D-4. Undo 12 screws and remove the SCORE BASE UNIT.

AP-700

: Screw

SCORE BASE UNIT

Notes on Assembly

• To assemble the SCORE BASE UNIT, tighten the screws while holding down the unit along the red lines shown below.

– 21 –

E. Remove the KEY COVER UNIT

E-1. Close the key cover.

E-2. Undo two screws and remove the BRACKET.

Remove the other side in the same manner.

BRACKET

: Screw

E-3. Undo one screw and while lightly holding the damper in place, remove the SHAFT/for KEY

COVER (with the E-RING). Remove the other side in the same manner.

AP-700

: Screw

SHAFT/for KEY COVER

Damper

– 22 –

AP-700

E-4. Undo six screws on the bottom surface and remove three SUPPORT BOARD.

SUPPORT BOARD

E-5. While slightly lifting the rear cover of the KEY COVER UNIT, slide the KEY COVER UNIT all

the way to the rear.

KEY COVER UNIT

E-6. Check that the sliding pin on both sides of the rear cover of the KEY COVER UNIT is visible

when seen from above the rail.

E-7. Lift the rear cover of the KEY COVER UNIT and then disengage the pins from the rail.

– 23 –

AP-700

E-8. While lifting the KEY COVER UNIT, slide the KEY COVER UNIT further toward the rear.

E-9. In the same manner as when disengaging the pins on the rear cover, disengage the pins on

the front cover from the rail and the grooves on the SIDE BOARD, and then remove the KEY COVER UNIT.

SIDE BOARD

Notes on Assembly

• To assemble the SHAFT/for KEY COVER, slightly lift the KEY COVER UNIT while holding the damper in place, and position the hole to insert the SHAFT/for KEY COVER.

• Align the groove on the SHAFT/for KEY COVER to that on the damper.

KEY COVER UNIT

Damper

SHAFT/for KEY COVER

– 24 –

F. Remove the BOX/PCB

[NOTE] If you perform the following steps while the piano unit is attached to the stand, use caution

as not to drop the BOX/PCB nor apply too much tension to the cables and connectors.

F-1. Undo four screws on the bottom surface.

AP-700

BOX/PCB

F-2. Slide the BOX/PCB to remove it.

[NOTE] The BOX/PCB and piano unit are connected with cables. Use caution when removing

the BOX/PCB.

[NOTE] Be sure to hold the BOX/PCB with a hand so as not to add tension to the cables and

connectors.

BOX/PCB

: Screw

– 25 –

F-3. Disconnect eight cables and remove the BOX/PCB.

[NOTE] Unlock the connector before disconnecting the ﬂ at cable.



No. Type Connected From Connected To

AP-700

















Harness Left tweeter PSA1 PCB

Harness Left speakers PSA1 PCB

Harness Right speakers PSA1 PCB

Harness Right tweeter PSA1 PCB

Harness HPA1 PCB PSA1 PCB

Harness LCA1 PCB MDA1 PCB

Flat cable KYB1 PCB MDA1 PCB

Harness Pedal connector MDA1 PCB

– 26 –

G. Remove the PCB UNIT/MAIN

G-1. Disconnect three cables.

No. Type Connected From Connected To

AP-700







G-2. Undo ﬁ ve screws and remove the PCB UNIT/MAIN.

Harness PSA1 PCB MDA1 PCB

Harness CNA4 PCB MDA1 PCB

CNA4 PCBPSA1 PCB

PCB UNIT/MAIN



: Screw

Notes on Assembly

• Connect the cables  and  before assembling the MDA1 PCB to the BOX/PCB.

– 27 –

+ 65 hidden pages

casio AP-700 Service Manual

AP-700

CONTENTS

SPECIFICATIONS

BLOCK AND WIRING DIAGRAM

PRINTED CIRCUIT BOARDS

DISASSEMBLY