Pioneer MA-990 Service Manual

Name: Pioneer MA-990
Brand: Pioneer
SKU: 8208844
Rating: 4 (1 reviews)

4 (1)

ORDER NO.

TRT1121

MIC.MIXER

MA-990

THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).

Type	Model	Power Requirement	Remarks
Type	MA-990	Power Requirement	Remarks
	MA-990

NY		AC230V

CONTENTS
1. EXPLODED VIEWS AND PARTS LIST	................ 2
2. SCHEMATIC DIAGRAM .......................................	4
3. PCB CONNECTION DIAGRAM ..........................	10
4. PCB PARTS LIST ...............................................	16
5. IC INFORMATION .............................................	18
6. PANEL FACILITIES AND SPECIFICATIONS . 21

PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan PIONEER ELECTRONICS SERVICE, INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.

PIONEER ELECTRONIC (EUROPE) N.V. Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium

PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 501 Orchard Road, #10-00 Lane Crawford Place, Singapore 0923 c PIONEER ELECTRONIC CORPORATION 1997

O - IZC DEC. 1997 Printed in Japan

MA-990

1. EXPLODED VIEWS AND PARTS LIST

NOTES:	∙ Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.
	∙ The	mark found on some component parts indicates the importance of the safety factor of the part.
	Therefore, when replacing, be sure to use parts of identical designation.
	∙ Screws adjacent to		mark on the product are used for disassembly.
∙ PARTS LIST					∙ PACKING
Mark No. Description				Part No.

	1	MAIN BOARD Assy	MWX1079
	2	FRONT BOARD Assy	MWX1077
NSP	3	VOLUME BOARD Assy	MWX1078
NSP	4	POWER SWITCH BOARD Assy	MWX1076
	5	Cord Stopper	MNK1183
	6	AC Power Cord	PDG1003
	7	• • • • •
NSP	8	Chassis	MNA3012
	9	Power Transformer	MTT1016
	10	Bonnet	MNA3013
	11	Rear Panel	MNA1114
	12	Panel Assy	MXA1043
	13	Name Plate	VAM1032
	14	Indicator B	RNK1385
	15	Lens	MNK3080
	16	• • • • •
	17	Power Button	MNK3081
	18	Button	MNK3082
	19	Rotary Knob (A)	RAC1861
	20	Insulator Assy	AMR2140
NSP	21	Angle	MNA3016
	22	Packing Case	MHG1190
NSP	23	Power Holder	MNA3017
	24	Protector	MHA3012
	25	Sheet	MHL3013
	26	Operating Instructions	MRB1025
		(English/French/Spanish)
	27	Connection Cord (AUDIO)	MDE1050
	28	Cover	MNG3008
	29	Screw	BBZ30P060FZK
	30	Screw	BBZ40P060FZK
	31	• • • • •
	32	Display Panel	MAH1015
	33	Screw	ATZ30P080FMC
	34	• • • • •
	35	Screw	BBZ30P100FZK
	36	Screw	BBZ30P060FMC
	37	Pad	MHA3013
	38	• • • • •
	39	Panel	MNK1196
	40	Poly Bag	PO230×340×0.05A
	41	Connector	MDF1024
	42	Connector	MDF1019
	43	Warranty Card	ARY7008

MA-990

∙

1 2 3 4

MA-990

	3.SCHEMATIC DIAGRAM
	Note : When ordering service parts, be sure to refer to
	Note : When ordering service parts, be sure to refer to	A-a
	"EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST".	A-a
	"EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST".

A MAIN BOARD ASSY (MWX1079)

+9V

+5V

C611

JA402

+9V

L611

C665 1000P

C607

R609 1.5k

33/16

+9V.2

MKN1017

2.2

C650

1/50

R401

C409 33/16

R611

C425 33/16

33/16

IC401

R411

R685

R613

R617

C401

C407 1000P

IC402 (1/2)

C601 AG

R631

8 91k

TC4052BP

100k

1.1k

AG 1M

110k

91k

330P

M5218AL

33/16

+ R603 1.1k

R607 3.9k

R402

1 Y0

VDD

R407 100k

IC603 (1/2)

C613

5 Y1

YC 3

R601

C603

R605

C402

C605

M5218AL

1500P

2 Y2

R413

100k

1000P

1.1k

JA401 (1/2)

330P

4 Y3

R412

100

4700P

R612

R619

C403

MKN1024

R403

12 X0

100k

C608

R610 1.5k

91k

11k

330P

XC 13

IC402 (2/2)

1/50

14 X1

C666

+5V

VCR

R409 100

R408 100k

M5218AL

1000P

R686

R614

R618

R632

R404

R410 100

R414

C602

R604

1.1k

110k

91k

C404

VEE 7

100

33/16

+AG 1.1k

R608 3.9k

IC603 (2/2)

INH

C426

R602

C604

R606

C614

JA401 (2/2)

330P

VSS

33/16

C410 33/16

C606

M5218AL

1500P

MKN1024

R405

C408

100k

1000P

1.1k

−9V

4700P

C612

R620 11k

C405

1000P

33/16

−9V

L610

C655

330P

TAPE

−9V

IS1

C618 33/16

47/16

C617 1/50

2.2

R625 1.5k

R406

+9V.2

IS2

+5V

C406

R633

R684

R626

330P

C507 1000P

C651

1.1k

8 91k

R629

C504

IC501 (1/2)

R622

AG 1M

R627 110k

91k

R501

UPC4570HA

C508

33/16

1.1k

R624 3.9k

39 38

37 36

35 34

33 32 31 30

4.7/50

IC604 (1/2)

C622

470

ECHO

C615

JA501

C503

R502

R503

R621

R623

C616

M5218AL

1000P

ADR1

ADRVss

ADR2

ADL3 ADLVdd ADL1 ADLVss

ADL2 DARVdd DADR DARVss

100k

1000P

MKN3005

2200P

56k

33k

R506

IC604 (2/2)

1.1k

4700P

C620

R505

100

M5218AL

33/16

R630

ADR3

ADRVdd

4.7k

−9V

11k

ADM2

C501

C502

R504

C506

ADMVss

0.01

C505

+330

1800P

DSPVCC

ADM1

10/50

+5V

ADMVdd

F602

ADM3

L608

VCC

MTF3002

Q501

2.2

+C654

2SA1048

KMI3

C656

C653

J501

DG1

R508

47/16

0.01

C673

C674

51 P3

R507

10k

DG1

DG1 DG1 DG1

33/16

1000P

IC601

10k

JA502

Vdd3

LC83025E

MKN3006

R509 47k

DG2

Vss3

R510 47k

KMI1

SIRQ

C509

C510

SICK

0.01

SRDY

KMO3

SIAK

DG1

Q502

VCC L605

F601

C642

R511

C512

2SA1048

2.2

MTF3002

33/16

IC602

4.7/50

IC502 (1/2)

C640

C641

LC32464P-80

470

UPC4570HA

100

JA503

C511

R512

R513

0.01

R652

64 A4

R516

R653

100

MKN3005

2200P

56k

33k

5 R515

DG2 DG2 DG2 DG2

R654

100

Vdd4 Vss4

100

A7 A8 D7

D6 D5

D4 D3

4.7k

C514

R670

100

I/O1

R655

100 A3

R514

1800P

R656

100 A4

67 68 69

70 71

72 73 74 75

C523 33/16

R671

100

I/O2

R657

100 A5

C513

+330

C524 1000P

R672

100

I/O3

R658

100 A6

DSPVCC

10/50

−9V

R673

100

I/O4

R659

100

DG2

RAS

R675

100 RAS

R676

100 CAS

IC502 (2/2)

+9V.2

C521

33/16

CAS

L603

R677

100

2.2

R517

UPC4570HA

C522

R678

100 WE

VSS

C518 4.7/50

1000P

C676

C677

470

JA504

C517

R519

33/16

1000P

R518

MKN3005

2200P

56k

33k

R521

R522

SIRQ SI SICK SRDY

DG2 DG2

100

SIAK

DG1

DG2

4.7k

DSP,CONTROL

C550

R520

C520

0.01

C519

+330

1800P

10/50

+9V.2

C529

C527

SW501

R528

33/16

MSG3005

33k

R532

C531

C528 33P

10k

R535 33k

R529

R530

C530 R533

10/50

10/50 33k

MIC

100

10k

IC503 (1/2)

MIC3

R527

IC503 (2/2)

R531

R534

IC504 (1/2)

+ M5218AL

MIC1,2

220

M5218AL

220

C537

220

M5218AL

33/16

ECHO

−9V

INPUT.SELECT

MIC1 MIC2 MIC3 MIC3

MIC1,2

ECHO

KEY.MATRIX

R L

R AG

LED.SELECT

VCC

KMI1 KMI2 KMI3 KMI4 KMO1 KMO2 KMO3 LSEL1 LSEL2 LSEL3 LSEL4

LED1 LED2 LED3 LED4 LED5

LED6 LED8

JA505

JA701

JA702

DG1

MKP1019

MKP1022

MKP3007

1 2 3 4 5 6 7 8 9 10 11

1 2 3 4 5 6 7 8 9

1 2 3 4 5 6 7 8 9 10 11 12

MDD1016

1 2 3 4 5 6 7 8 9 10 11 12

MDD1019

1 2 3 4 5 6 7 8 9 10 11

MDD1018

1 2 3 4 5 6 7 8 9

CN301

CN201

CN202

C011

MEP3009 123456789101112

MEP3015

1 2 3 4 5 6 7 8 9 10 11

MEP3010

VCC

2 3 4 5 6 7 8 9

VCC

D202 D203 D204 D205 D206

DG1

POWER

R301

R302

R303

6 5

2 3

VCC

23 22 21 20

D207 D218

R201

3.3k

201

202

203

204

G1 G2

1 3

SUR VOCEVOCP OTK

C201

IC201

330

0.01

VDD TC74HC154AP

VSS

330 330 270 270 330

11 12 13

VR301

VR302

VR303

VR304

VR305

0 1 2 3 4 5

6 7 8 9 10

14 15

D201

10k(B)

50k(B)

1 2 3 4 5 6 7 8 9

10 11 13 14 15 16 17

VCC

MCS3002 MCS3002 MCS3002 MCS3003

MCS1014

R202 R203 R204 R205 R206

MIC1

MIC2

MIC3

ECHO

MUSIC

205

206

208

DG1

TAPE

VCR

DG1

VOLUME BOARD ASSY

DG1

VCC

C202

B (MWX1078)

1/50

SUR

VOLE VOLP

OTK LD TAPE

VCR

D209

D210

D211 D212

D213

D214 D215 D216

D217

R208

209

210

211

330

D201,206,207,218

:SLR-342VC

D202,203,205,

:SLR-342MC

4 3 2 1 N #1 #2 #3 #4

D209-212,214-217

D204,213

:SLR-342DC

SW201-206,208-211

C FRONT BOARD ASSY (MWX1077)

A B C

: MSG3006

MA-990

A-b

+9V

+9V.2

IC501 (2/2)

R542

UPC4570HA

IC606(1/2)

IC606(2/2)

+9V

15k

C629

C429

M5218AL

R543

C515 33/16

100/16

C413

+ 33/16

JA403(1/2)

27k

C516

R437

9.1k

C625

4700p

C633

4700p

−9V

R433

MKN1024

R641

R415

100p

1000P

C421

C663

R637

R682

–

9.1k

–

4.7/50

6.8k

R423

–9V

4.7/50

R645

2 –

15k

R427

C417

100k

470p

LINE

R635

100k

C623

2200p

R639

R643

100

R647

R417

R419

10k

2.2k

10/50+

Lch

C422

9.1k

C627

9.1k

C635 +9V

100k

10/50

4.7k

R434

C630

3 +

270p

100/16

180p

10k

C415

R425

R429

Rch

AG 100k

470p

R636

100k

C624

2200p

R640

C628

R644

180p

100k

R421

M5218AL

100k

Q401

(2/4)

R438

R435

C636

C631

R648

IC404(1/2)

IC405

100

270p –9V

9.1k

R642

9.1k

100/16

C414

2SD2144S

Lch

4 IO

OI 3

100

R638

R683

9.1k

C664

C626

4700p

C634

4700p

100

R416

100p

R424

IC405

R431

C419

TAPE

4.7/50

9.1k

–

4.7/50

6.8k

100k

470p

R646

C638

IC605(2/2)

IC605(1/2)

C632

6 –

15k

R428

C418

(3/4)

R432

C420

+5V

R418

10/50

Rch

8 IO OI

AG 100k

470p

M5218AL

100/16

R420

10k

5 +

2.2k

L602

–9V

10k

C416

R426

R430

+9V

R436

JA403(2/2)

2.2

R422

10/50

4.7k

100

MIC

IC404(2/2)

100k

C427

MKN1024

-9V M5218AL

Q402

IC405

33/16

2SD2144S

IC405

(1/4)

(4/4)

29 28 27

26 25

C675

+5V

1 IO

OI 2

11 IO

OI 10

1000P

VCC VCC

DALVdd DADL

DALVss

Vdd2 TEST5

2.2

J701

J702

TC4066BP

33/16

VCC

12 7

DG2

L606

R712

VCC

IC405 :

C428

47k

TEST2

C669

47k

DG1

47/10

F701

ST4

-9V AG

TEST3

DG2

IC608

LED2

R704

PE0/TRA 41

R71347k

R71447k R71547k

R71647k

DG1DG1C701 C702

DG1 DG10.01

: AUDIO SIGNAL ROUTE

SAIF 17

2 P01

MTF3002

TEST1

1000p

IC701 PDC031A

TEST6

C660

0.01

C703

SAOF

47/10

LED1

1 P00

PE1/TRB 42

RES

LC78815M

LED3

P02

Vdd

KMI4

Vss2

R687

33.8688MHz

C661

C662

LED4

P03

PD3/CMP3

POWER SWITCH BOARD ASSY

Vss1

CH1OUT

CH2OUT

LED5

KMI3

OSC2

100

X601

47/10

LED6

P10

PD2/CMP2

KMI2

SW321 : POWER STANDBY/ON

MSS1017

C670

3 REFH

P11

PD1/CMP1

OSC1

C643

C644

1000p

VrefH

VrefL

LED7

P12

PD0/CMP0

KMI1

FRONT BOARD ASSY

Vdd1

1000P

4 AVdd

AGND

LED8

SELC

13P

5 LRCK

REFL

RESDSP

P13

PC3/Vr1

SW201 : SURROUND

FS3841

DG2

C645

DATAL

DGND

SI0/P20

PC2/Vr0

SW202 : CHORUS

LRCKI

L601

30P

DATAR

MODE2

SICK

SO0/P21

P63/PIN1

KMO3

SW203 : VOC.P.

SK0/P22

P62/SK1

BCKI

1.5

BCLK

MODE1

SIAK

INT0/P23

P61/SO1

KMO2

SW204 : ONE T.K.

ASI

DG2

SYSCLK

FSEL

INT1/P30

P60/SI1

KMO1

SW205 : INPUT SELECTOR1

FS3840

R679

100

DVdd

TSTOUT

SRDY

14 PO0/P31

P53/INT2 29

SW206 : INPUT SELECTOR2

LRCKO

MIC

R680

100

DG1

SIRQ

PO1/P32

P52

SW208 : INPUT SELECTOR3/TAPE

BCKO

ASO

R681

100

MTF3002

HLD/P33

P51

IS1

SW209 : KEY CONTROL

LSEL1 17

P40

P50

IS2

SW210 : KEY CONTROL

DWAT

F603

LSEL2 18

P41

P43

LSEL4

DREAD

C672

C671

TEST

P42

LSEL3

SW211 : KEY CONTROL #

DG1

D2 D1

RAS CAS

1000p

Vss

RES

MAIN BOARD ASSY

C657 C658 C659

DG1 DG1 DG1

OSC1

OSC2

SW501 : MIC.3 ECOH

76 77

79 80

22P

DG1

X701

Large size

MSS3013

4MHz

SCH diagram

D2 D1

RAS CAS

DG1

RESDSP

C707

0.01

R708

10k

VCC

A-a

A-b

IC702

C706

1/50

M51951BSL

MIC

+9V.2

DG1 R709

+5V

DG1

D701 1SS254

2.7K

RD4.3ES

R711

2.7K

R541

C533

33p

R536

C532

R537

120k

47k

Interrupt Det .

D702

Q701

C535 1SS254

9.1k

0.068

R540

C708 220/10

Guide page

2SC2458

R710

100K

2SC2458

IC504(2/2)

–

1/50

D501

8.2k

Q504

+33/16

R538

100k

C536 10/50

R539

330k

C012 10/50

C013

3.3/50

D012

RD16JS

1SS254D014

R006 10K

D015

1SS254

M5218AL

C534

R004

D013

+9V

A-a

A-b

–9V

AG AG

4.7K

1SS254

Q001

INPUT.SELECT

2SA933S

+9V.2

1SS254D009

1SS254D010

1SS254D011

R002

C014

100/25

LED.DRIVE

R003

22K

R005

KEY.MATRIX

10K

Q002

LED.SELECT

2SC1740S

Q003

2SA933S

L501

–9V

A-a

A-b

2.2

+9V

+5V

D001–D008 :

R001

4.7k

NJM78L05A

NJM7809FA

MEP1049JKE1001

47/10

T003

BLU

2T002JKE1002

JKE1003T0011

AC 230V

C007C008 0.10.1

COM

C001C002 1000/251000/25

IC004

IC001

ERA15–02KFRB

POWER TRANSFORMER

Detailed page

1 OUT IN 3

D001

MTT1016

0.1 C010

+ COM

COM

D002

BLK

C004

RED

47/16

RED

C005

BLU

BRN

47/16

D003

BLU

WHT

LIVE

1 OUT IN 2

D004

10 9 8 7 6 5 4 3 2 1

CN001

2 NEUTRAL

50/60Hz

–9V

IC002

MDD1015

10 9 8 7 6 5 4 3 2 1

BLU

NJM7909FA

AC POWER CORD

VCC

MEP1049

NJM7805FA

PDG1003

10 9 8 7 6 5 4 3 2 1

CN321

IC003

D005

1 OUT IN 3

COM

C009

0.1

C006

47/16

C003

1000/25

D006

0.01

C322

0.01

MSG1007

0.01

C325

C324

C323

C321

SW321

D007

DG1

D008

D POWER SWITCH BOARD ASSY

(MWX1076)

A D 5

5	6	7	8

a-A

A MAIN BOARD ASSY (MWX1079)

JA402

+9V

MKN1017

R401

C425 33/16

C401

IC401

C407 1000P

330P

TC4052BP

1 Y0 VDD

R402

5 Y1

YC 3

C402

2 Y2

JA401 (1/2)

330P

C403

MKN1024

R403

12 X0

330P

XC 13

14 X1

R409 100

15 X2

VCR

R404

11 X3

R410 100

C404

VEE 7

INH

C426

JA401 (2/2)

330P

VSS

33/16

MKN1024

R405

C408

C405

1000P

AG −9V

TAPE

330P

R406

+9V.2

C406

330P

IC501 (1/2)

C507 1000P

R501

C504

C508

33/16

470

4.7/50

UPC4570HA

JA501

C503

R502

R503

MKN3005

33k

R506

2200P

56k

R505

100

4.7k

C501

C502

R504

C506

0.01

C505

330

1800P

10/50

VCC

Q501

2SA1048

KMI3

J501

DG1

R508

R507

10k

JA502

10k

MKN3006

R509 47k

KMI1

R510 47k

C509

C510

0.01

KMO3

DG1

Q502

C512

2SA1048

R511

IC502 (1/2)

4.7/50

470

UPC4570HA

JA503

C511

R512

R513

MKN3005

33k

R516

2200P

56k

5 R515

100

4.7k

C514

R514

1800P

C523

33/16

+330

C513

C524 1000P

10/50

−9V

IC502 (2/2)

+9V.2

C521

33/16

R517

UPC4570HA

C522

C518

4.7/50

1000P

470

JA504

R519

C		B		A

+9V

+5V

C611

L611

C665 1000P

C607

R609

1.5k

33/16

+9V.2

2.2

C650

1/50

C409 33/16

R611

R411

33/16

R631

R685

R613

R617

C601 AG

8 91k

100k

IC402 (1/2)

1.1k

AG 1M

110k

91k

M5218AL

33/16

+ R603 1.1k

R607 3.9k

R407

100k

R601

C603

R605

IC603 (1/2)

C613

C605

M5218AL

1500P

R413

100k

1000P

1.1k

R412

100

4700P

R612

R619

100k

C608

R610 1.5k

11k

IC402 (2/2)

1/50

91k

C666

+5V

R408 100k

M5218AL

1000P

R632

R686

R614

R618

C602

R604

110k

91k

R414

1.1k

100

33/16

+AG 1.1k

R608 3.9k

IC603 (2/2)

C614

R602

C604

R606

C410

33/16

M5218AL

C606

1500P

100k

1000P

1.1k

C612

4700P

R620 11k

−9V

33/16

L610

IS1

C617

1/50

R625

1.5k

C618 33/16

2.2

IS2

+5V

R626

R633

R684

C651

1.1k

8 91k

R629

R622

AG 1M

R627 110k

91k

33/16

1.1k

R624 3.9k

C622

IC604 (1/2)

ECHO

R621

C615

R623

C616

M5218AL

1000P

100k

1000P

IC604 (2/2)

1.1k

4700P

C620

M5218AL

33/16

R630

−9V

11k

+5V

DSPVCC

F602

L608

MTF3002

2.2

C656

C653

C654

C673

C674

47/16

0.01

DG1

DG1 DG1 DG1

33/16

1000P

DG2

VCC L605

F601

C642

2.2

MTF3002

33/16

IC602

C640

C641

LC32464P-80

R652

100

0.01

DG2 DG2

R653

100

R654

100

R670

100

R655

100

I/O1

R656

100

R671

100

I/O2

R657

100

R672

100

I/O3

R658

100

R673

100

I/O4

R659

100

RAS

R675

100

RAS

R676

100

CAS

R677

100

R678

100

VSS

a-A	b-A	1 990-MA

+5V

C655

L602

47/16

2.2

39 38

37 36

35 34

33 32 31 30 29 28 27

26 25

ADR1

ADRVss

ADR2

ADL3

ADLVdd ADL1 ADLVss

ADL2

DARVdd DADR DARVss DALVdd DADL DALVss Vdd2 TEST5

ADR3

ADRVdd

TEST4

TEST3

ADM2

TEST2

ADMVss

TEST1

ADM1

TEST6

ADMVdd

SAOF

ADM3

SAIF

RES

Vss2

Vss1

IC601

OSC2

OSC1

Vdd3

LC83025E

Vdd1

Vss3

SELC

SIRQ

FS3841

LRCKI

SICK

BCKI

SRDY

ASI

SIAK

FS3840

LRCKO

BCKO

ASO

DWAT

DREAD

A7 A8

D6 D5

Vdd4 Vss4 D4 D3 D2 D1 D0 RAS CAS

67 68 69

70 71

72 73 74 75 76 77

79 80

DSPVCC

DG2

2.2

D2 D1

RAS CAS

L603

C676

C677

33/16

1000P

80				CAS
79				RAS
78					D0
77					D1
76					D2
75			DG2		D3
74	DSPVCC			L603 2.2			+	1000P
73	DSPVCC			L603 2.2			+	1000P
73							C677
71							C677
72
70
69
68							C676	33/16
67							C676	33/16
67
66
65
A5	A6 A7 RAS CAS RE WE
100	100	100	100	100	100	100
R657	R658	R659	R675	R676	R677	R678


7		6		10	5 16 1 4
A4	A5		A6 A7			RAS CAS OE WE
I/O1	I/O2		I/O3	I/O4		VSS 18
3		15		17
100		100		100
R671		R672		R673
D1		D2		D3

DG2 DG2 DSP,CONTROL

DG1 DG2

SIAK

SRDY

SICK

SIRQ

				R	9								+9V.2	L5 2		NJM7	IC	1	47/10+
																		OU C
																+5V			C010			AG
																+5V				1.0		AG
																				1.0
																			C011
C527	33/16		R53533k	AG		MIC	IC504(1/2)		M5218AL					DG1						VCC			330		D201	DG1		342VC	342MC	342DC
+9V.2	+		R53533k	8		1	IC504(1/2)		M5218AL					DG1						VCC		R201	330		D201	DG1		342VC	342MC	342DC
	+

+9V.2			10k C531	82					C537	AG9V−										VCC		POWER		VSS		15		R208 D201,206,207,218330 :SLR-	D202,203,205,:SLR- -212,214-217	D204,213 :SLR-
+9V.2	+		10k C531	82		1	4		C537	AG9V−										VCC		DG1		VSS		15		R208 D201,206,207,218330 :SLR-	D202,203,205,:SLR- -212,214-217	D204,213 :SLR-
				2			3			AG						9	9		9							VCC
			10/50		+		3	R534	220	AG			LED6			8	8		8			D207				VCC	VCR
													LED8			7	7		7			D218					TAPE
				R533 C530									LED5			6	6		6			D206		330		R206	LD
					33k 10/50		(1/2) IC503						LED4			5	5		5			D205		270		R205	OTK
					33k 10/50		(1/2) IC503	M5218AL					LED3			4	4		4			D204		270		R204	VOLP
													LED2			3	3		3			D203		330		R203	VOLE
													LED2			2	2		2			D203		330		R203	SUR
						+							LED1			2	2		2			D202		330		R202	SUR		D209
						+							LED1			1	1		1			D202		330		R202
C529	33/16	R532	AG	R530R529		10k100		R531	220 33/16	AG	INPUT.SELECT	KEY.MATRIX LED.SELECT	VCC	JA702		1	1		1	CN202	MEP3010			TC74HC154AP		DG1	VCC
C529	33/16	R532	AG	R530R529		10k100	3	R531	220 33/16	AG	INPUT.SELECT	KEY.MATRIX LED.SELECT	VCC	JA702	MKP3007		MDD1018			CN202	MEP3010			TC74HC154AP		DG1	VCC
								+																12
																						19	G2		15	17
																						19	G1		14	17
																						18	G1		14	16
																						18			13	16
																									13
																									12	14
																									11	14
																									11	13
																									10	13
																							D		10	11				#4
																									9	11		D217
																						20			9	10
																						20	C		8	10				#3
																						21	C		8	9		D216		#3
																						21	B		7	9		D216		#2
																						22	B		7	8		D215		#2
																						22	A		6	8		D215		#1
																						23	A		6	7		D214		#1
																						23	C201IC201		5	7		D214		N
	R528	33k	33PC528	6		7	5	(2/2)IC503	M5218AL	ECHO			KMO3									VCC		VDD0.01	5	6	DG1 C202	1/50		N
	R528	33k	33PC528	6		7	5	(2/2)IC503	M5218AL	ECHO			KMO3									VCC		VDD0.01	+	6	DG1 C202	1/50
																									4	5		D212		1
																									3	4		D211		2
																									2	3		D210		3
																									1	2		D209		4
																									0	2		D209
																									0	1
																									24	1
													LSEL4			11	11		11						24
																11	11		11
																10	10		10
													LSEL3			10	10		10
													LSEL3			9	9		9
													LSEL2			9	9		9
													LSEL2			8	8		8
													LSEL1			8	8		8
													LSEL1			7	7		7
										AG						7	7		7
								R527 220					KMO2			6	6		6
1 3		4 6											KMO2			5	5		5			SW 204 OTK				SW 208 VCR
1 3		4 6											KMO1			5	5		5			SW 204 OTK				SW 208 VCR
													KMO1			4	4		4
														KMI4		4	4		4
														KMI4		3	3		3
														KMI3		3	3		3
														KMI3		2	2		2
														KMI2		2	2		2				VOCESURVOCP
2	SW501	MSG3005	5					MIC3	MIC1,2					KMI2			MDD1019		1	CN201	MEP3015	SWSWSW 202201203				SWSW 206205 TAPELD		SWSWSW 210209211	N#
2	SW501	MSG3005	5					MIC3	MIC1,2					JA701	MKP1022		MDD1019			CN201	MEP3015	SWSWSW 202201203				SWSW 206205 TAPELD		SWSWSW 210209211	N#
														KMI1		1	1
														KMI1

MA-990

	A-b
	A-a	A
	A-a


FRONT BOARD ASSY (MWX1077)

		B
		B
C

SW201-206,208-211 : MSG3006

1800P C523 33/16		C524 1000P	AG
+
R514		+	−9V
	330
		C513	10/50 AG

C521 33/16		C522	1000P AG
+9V.2	+				1
IC502(2/2)		UPC4570HA		4
			C5184.7/50		+

		R517		470
					2

	R522	100
2		R521	4.7k	C520	1800P
R519 33k				R520	+
3					330
R518	56k		AG		C519 10/50	AG
4	2200P		AG	C550	0.01	FG
C517
	1		AG
JA504	MKN3005

ECHO

MIC1,2

MIC3

MIC2

MIC1

	12
	11
	10
	9
	8
	7
	6
	5
	4
	3
	2
	1
JA505	MKP1019

12 11 10 9 8 7 6 5 4 3 2 1

MDD1016

12 11 10 9 8 7 6 5 4 3 2 1

CN301

MEP3009

2	1	VR305	50k(B)	MCS1014	MUSIC
3
5		VR304	10k(B)	MCS3003	ECHO
6	1	VR304	10k(B)	MCS3003	ECHO
	4
R301 R302 R303 3.3k 2 3.3k 2 3.3k 2 2	3 1 3 1 3 1 3	VR301 VR302 VR303	10k(B) 10k(B) 10k(B)	MCS3002 MCS3002 MCS3002	MIC1 MIC2 MIC3

B VOLUME BOARD ASSY (MWX1078)

A-a B C 7

5	6	7	8

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