SERVICE MANUALRef. No. 3677

SAFETY-RELATED COMPONENT WARNING!!COMPONENTS IDENTIFIED BY MARK ON THE

SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE

CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.

REPLACE THESE COMPONENTS WITH ONKYO

PARTS WHOSE PART NUMBERS APPEAR AS SHOWN

IN THIS MANUAL.

MAKE LEAKAGE-CURRENT OR RESISTANCE

MEASUREMENTS TO DETERMINE THAT EXPOSED

PARTS ARE ACCEPTABLY INSULATED FROM THE

SUPPLY CIRCUIT BEFORE RETURNING THE

APPLIANCE TO THE CUSTOMER.

052001

A-905TX

INTEGRATED STEREO AMPLIFIER

A-905TX

UDT 120V AC, 60HzUPT 230-240V AC, 50Hz

STANDBY/ON

PHONES

STANDBY

A-905TX

INTEGRATED STEREO AMPLIFIER

TREBLEBASS BALANCE

POWER

OFF/1/2— + — + L R

PRESENCEACOUSTIC

CD MD TUNER

LINE/DVD

TAPE

CDR/PC

SOURCE DIRECTDIRECT

DIRECT

TONE

INPUT

ON OFF

VOLUME WIDE RANGE AMP TECHNOLOGY

CLOCK SLEEP EFFECTGRAPHIC EQ

MODE

1 2 3

4 5 6

7 8 9

10 / 0- - / - - -

VOLUME

PRESET

F M A M

PLAY MODE

PLAY MODE

REPEAT

CLEAR

SCROLL

MEMORY

REPEAT

CLEAR

DISC

REPEAT

CLEAR

ACOUSTICPRESENCE

TONE

RANDOM

TIMER

UP/DOWN

ENTER

MUTING

INPUTTUNER

M D

DVD

C D

CDR

TAPE

REC

REC

PAUSE / STEP

STANDBY/ ON

REMOTE CONTROLLER RC -456S

A-905TX

SPECIFICATIONSPART-XX

SERVICE PROCEDURESPART-XXReplacing the fuses

REF.NO. PART NO. DESCRIPTION This symbol located near the fuse indicates that thefuse used is show operating type, For continued protection againstfire hazard, replace with same type fuse , For fuse rating, refer to the marking adjest to the symbol.

Ce symbole indique que le fusible utilise est e lent. Pour une protection permanente, n'utiliser que des fusibles de meme type. Ce demier est indique la qu le present symbol est apposre.

F901 252158 1.6A-UL/T-237, Fuse <DT>252069 0.8A-SE-EAK, Fuse <PT>

F902-F904 2.5A-SE-EAK, Fuse <PT>252075

NOTE:<DT> : Asian model only for 120V<PT> : Asian model only for 230V

A-905TX

CHASSIS EXPLODED VIEW############

A51

A65

A66A11

A10

A10

A11

A10A61

A64

A63A52

A58

A50

A67

U9

A1

A13

A55A53A54

A56

A73

A73

A16

U4

F901

A43

A43

A25

A26

E860

A34

A34

T901

Q523Q525

Q526

Q524

Q528

Q527

A28

A10

P701

A10

A10

A10

U3

U2

P402

P402

A46

A49

A49

A49

A49

U7

U1

U8

U5

A41

A27

A27

P801

A81

A40

A11A11

A11

P901

P584A

U10

F903F904F902

A47

A-905TX

CHASSIS EXPLODED VIEW PARTS LIST############

REF NO. PART NO. DESCRIPTION REF NO. PART NO. DESCRIPTION

A1 27111123 Front bracket P402 27190011 KGLS-6S, HolderA10 838130088 3TTB+8B, Self tapping screw P584A 880009 Plastic rivet, NRP-345 <PT>A11 838430088 3TTB+8B(BC), Self tapping screw P701 27191106 UAMS-05S-2, HolderA13 28198862 Facet, VOL P801 25055436 or NPLG-2P418, Shorted plugA16 27100375D Chassis 25055945A25 27160451B

27160452BA26 29110083 Adhesive tape, CROSS-16U Q523,Q524 2202303 or * 2SC4512-O orA27 801525 3TTB+8B(BC), Special screw <PT> 2202304 or * 2SC4512-Y or

838430088 3TTB+8B(BC), Self tapping screw <DT> 2202305 * 2SC4512-P, TransistorA28 801433 3SMS8W.SW+14B(BC), special screw Q525,Q526 2202313 or * 2SA1726-O orA34 27141530A Retainer, HS-2 2202314 or * 2SA1726-Y orA40 27300750 Bussing cord 2202315 * 2SA1726-P, TransistorA41 27122831 Rear panel <DT> Q527,Q528 2212654 or * 2SC3421-Y or

27122832 Rear panel <PT> 2212653 * 2SC3421-O, TransistorA43 830440089 4TTC+8C(BC), Self tapping screwA46 28184759-1A47 29362571 Label, WARNING <DT,PT>

2301423 NPT-1374D, Power transformer <DT>

A49 838930088

Heat sink <DT> P901 253277MIL AS-UC-2#18, Power supply cord <DT>Heat sink <PT> 253193HIT AS-CEE, Power supply cord <PT>

Top coverT901

3TTB+8B(UN), Self tapping screw

2301424 NPT-1374P, Power transformer <PT>

A50 838430107 3TTB+10S(BC), Self tapping screw

U1 1A905530-4B NADG-6630-4B, Main circuit PC board ass'y <DT>

A51 27212298 Front panel

1A905530-4C NADG-6630-4C, Main circuit PC board ass'y <PT>

A52 28198894 Facet 7P

U2 1A905531-4B NAAF-6631-4B, Preamplifier circuit PC board ass'y <DT>

A53 28198895 Facet 1P

1A905531-4C NAAF-6631-4C, Preamplifier circuit PC board ass'y <PT>

A54 28198925 Facet A

U3 1A905532-4B NAAF-6632-4B, Acoustic circuit PC board ass'y <DT>

A55 27268037 Guide A

1A905532-4C NAAF-6632-4C, Acoustic circuit PC board ass'y <PT>

A56 28325133 Knob, FM

U4 1A905533-4B NAPS-6633-4B, Power supply circuit PC board ass'y <DT>

A58 28191798 Clear plate, RE

1A905533-4C NAPS-6633-4C, Power supply circuit PC board ass'y <PT>

A61 28325926 Knob, INPUT

U5 1A905534-4B NADIS-6634-4B, Display circuit PC board ass'y <DT>

A63 28135247Y Badge

1A905534-4C NADIS-6634-4C, Display circuit PC board ass'y <PT>

A64 28325925 Knob, VOL

U7 1A905536-4B NAETC-6636-4B, Speaker terminal PC board ass'y <DT>

A65 28325674 Knob, TD

1A905536-4C NAETC-6636-4C, Speaker terminal PC board ass'y <PT>

A66 28325927 Knob, TONE

U8 1A905537-4B NAETC-6637-4B, Terminal PC board ass'y <DT>

A67 28325673 Knob, POWER

1A905537-4C NAETC-6637-4C, Terminal PC board ass'y <PT>

A73 27175323 Leg AS

U9 1A905539-4B NAETC-6639-4B, Power switch PC board ass'y <DT>

A81 29362630 Label, PROCESSOR

1A905539-4C NAETC-6639-4C, Power switch PC board ass'y <PT>

F901 252158 1.6A-UL/T-237, Fuse <DT>

U10 1A905540-4C NAETC-6640-4C, Fuse PC board ass'y <PT>

252069 0.8A-SE-EAK FSBFUSE, Fuse <PT>F902-F904 2.5A-SE-EAK FUSE <PT>

NOTE:<DT> : Asian model only for 120V<PT> : Asian model only for 230VNOTE: THE COMPONENTS IDENTIFIED BY MARK

ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE ONLY WITH PART NUMBER SPECIFIED.

CAUTON : Replacement of the transistor of mark * ,if necessary, must be made from the same beta group(HFE) as the original type.

252075

SCHEMATIC DIAGRAM-1

U7

U9

U4U10

U1

U8

SPEAKER TERMINAL PC BOARD

A-905TX

POWER SWITCH PC BOARD

POWER SUPPLY CIRCUIT PC BOARD

FUSE PC BOARD

MAIN CIRCUIT PC BOARD

TERMINAL PC BOARD

-1.2

1.2

5.6

12.2

-12.2

12.411.8

-24.6

24.6

-1.2

1.2

-24.1-24.6

24.624.1

-24.1-24.6

24.624.1

E LENT. POUR UNE PROTECTION PERMANENTE,N'UTILISERCE SYMBOLE INDIQUE QUE LE FUSIBLE UTLISE EST

INDIQUE LA QU LE PRESENT SYMBOL EST APPOSE.QUE DES FUSIBLES DE MEME TYPE. CE DARNIER EST

RATING REFER TO THE MARKING ADJACENT TO THE SYMBOL

FOR CONTINUED PROTECTION AGAINST FIREHAZARD,REPLACE WITH SAME TYPE FUSE. FOR FUSE

THIS SYMBOL LOCATED NEAR THE FUSE INDICATESTHAT THE FUSE USED IS SLOW OPERATING TYPE

ATTENTION

VA

ET CALIBRATION COMME INDIQUE.

D'INCENDIE, REMPLACER UNIQUEMENTPERMANENTE CONTRE LES RISQUESAFIN D'ASSURER UNE PROTECTION

PAR UN FUSIBLE DE MEME TYPE

VA

AGAINST FIRE HAZARD, REPLACEFOR CONTINUED PROTECTION

AND RATING INDICATED.ONLY WITH FUSE OF SAME TYPE

CAUTION

P91

0

P307

D914-D917GP104003E

+

JL70

2B

S951

S951

S951

P91

0P

910

*C312221K

*C311

221K

*C308101K

*C307

101K

*C304101K

*C303

101K

*C302101K

*C301

101K

*C320101K

*C319101K

*C316

101K

C315101K

*C314

101K

*C313101K

C712104J

P951P952

P90

2AP

911A

P91

2A

P951P952

P951P952

P91

1AP

912A

P951P952

P90

2A

P951P952

P91

2CP

911C

P91

1AP

912A

P91

4AP

913A

P951P952

P90

2A

P91

1BP

902B

P91

2B

P58

6BP

585B

P58

6AP

585A

P501AP401A

Q713M51943B

G IO

Q91178M56

G IO

R576500B

R575500B

R713 100K*7

R712100K*4

JL90

1AJL

901A

JL90

1A

JL58

2BP

461B

JL90

1B

P405C

P502AP403A

JL70

1B

Q704DTA124ES

Q451DTA114ES

Q70

2T

A72

91S

123456789

X701CST4.00MGW

D912

MTZJ12C

D913

MTZJ12C

D745

MTZJ5.1B

D705MTZJ5.6B

D707MTZJ5.1B

Q714

DTC144ES

Q912DTC123JS

Q703DTC144ES

RL901

RL901

D918

GP104003E

D706

D919

D702

D701

D704

D708

D722

D703

D911RBV402

D3SBA30

P901

P901

P901

AC230-240V/50HZ

P90

1AP

901A

P90

1A

F90

11.

6A/1

25V

F90

11.

6A/1

25V

F90

2

T2A

L250

V

F904

T2.5AL250V

F903T2.5AL250V

F90

1

Q701HD404316-E30H

27282930

34353944

905/90910

AV

CC

15

AVSS6

CE

43

CLK

40

DA

TA

42D

IRE

CT

14

GND5

HP

-IN

13

INPMUTE 26KEYIN9

LAT

41

MU

TE

LED

20

NC

22

PO

FF

17 21

POWER2 25

PR

OT

EC

T36

RE

MIN

18

RESET2

RII

N12

R IOUT11

SBASS1 31SBASS2 32SBASS3 33

SB

AS

SLE

DA

37S

BA

SS

LED

B38

SELIN17SELIN28

SP

-RE

LAY

19

TEST1

VC

C16

VOLDOWN24VOLUP 23

X13X24

L506

L502

L504

L501

L505

L503

JL58

1C

JL58

1A

P405B

P582

P584

R5620.22*2

(2W)

R5610.22*2

(2W)

C917330/16

C916330/16

C92210/16

C91947/16

C51610/16

C51510/16

C703100/6.3

C701

0.1/5.5

C9143300/35

C9153300/35

C9202200/16

C7082.2/50

C32210/16

C32110/16

C4512.2/50

C4522.2/50

C7111/50

Q5332SA992

Q7062SA933S-R

Q5262SA1726Q518

2SA992

Q5202SA965

Q525 2SA1726

Q5172SA992

Q5192SA965

Q5302SC1740S

Q5282SC3421

Q5272SC3421

Q5292SC1740S

Q7052SC1740S-R

Q5322SC1845

Q5222SC2235

Q5242SC4512

Q5162SC1845

Q5312SC1845

Q5232SC4512

Q5212SC2235

Q5152SC1845

P311A

P306

C9510.01

C9510.01

C30

9

101

C582471

C581 471

C9510.01

C921223Z

C918103J

C923223Z

C913104J

C912104J

C517473

C704

223Z

C707223Z

C533223Z

C702

474

C518473

C532223Z

C710

223Z

C709

223Z

C531223Z

R9160.47(1/2W)

R9160.47

(1/2W)

R5542.2 (1/2W)

R5522.2

(1/2W)

R5512.2(1/2W)

R353

1M

R9160.47

(1/2W)

R543100

(1/2W)

R55015

(1/2W)

R58210K

R581680

R55682

(1/2W)

R55582

(1/2W)

R351

2.2K

R3541M

R352

2.2K

R308

1M

R307

1M

R306

330

R305

330

R304

1M

R303

1M

R302

330

R301

330

R316

1M

R315

1M

R314

330

R313

330

R312

1M

R311

1M

R310

2.2K

R309

2.2K

R324

1M

R323

1M

R322

330

R321

330

R320

1M

R319

1M

R318

2.2K

R317

2.2K

R572220

R5681.8K

R5701.2K

R574220

R571220

R5671.8K

R5691.2K

R573220

R59310

(1/2W)

R59510

(1/2W)

R328

1M

R332

1M

R331

1M

R327

1M

R330

330

R326

330

R329

330

R325

330

R56010

(1/2W)

R6011K

R58310K

R5658.2

(1/2W)

R745

1K

R738

3.3K

R718100KR719100K

R74010K

R73922K

R61010K

R70522K

R914

270(1/2W)

R915

220(1/2W)

R913

220(1/2W)

R912

270(1/2W)

R917

10(1/2W)

R7082.2K

R7091K

R707220K

R70647K

R4712.2K

R472220K

R336

1M

R335

1M

R334

2.2K

R333

2.2K

R340

1M

R339

1M

R338

330

R337

330

R714

68K

R716

12K

R71568KR717

22K

R59610(1/2W)

R60810K

R56

68.

2

(1/2

W)

R6021K

R606

820

R604680

R5644.7

(1/2W)

R546100(1/2W)

R55810

(1/2W)

R548

15(1/2W)

R544100(1/2W)

R594 10 (1/2W)

R742100K

R736100K

R701 1M

R7103.3K

R711 4.7K

R7351KR7341K

R7331K

R605820

R60710K

R603680

R5634.7

(1/2W)

R5532.2 (1/2W)

R55910 (1/2W)R549

15(1/2W)

R545100

(1/2W)

R547

15(1/2W)

R55710 (1/2W)

P305

P301

P302

P303

P304

Q301TC9273N-010

10

11

12 17

18

19

20

21

22

23

24

25

26

27

CD3

CDR-P2

CK 15

DATA16GND13

L/DVD5

MD-P7

MD-R6

ST14

T-P9

T-R8

TU4

VDD 28VEE1

UJJ

NAETC-6639

NAPS-6633

NPT-1374J

/60HzAC100V/50Hz

T901

UDT

NAETC-6639

AC120V/60Hz

NAPS-6633

NPT-1374DT901

+B5

-B2

+B2

+B4+B3

-B1

+B1

NAETC-6640

UPT

T80

0mA

L250

V

R

L

SPEAKERS

CDR/PC

NAETC-6636

D918

Acoust ic Presence AMP&VR

UPT

UJJ,UDT

NAETC-6639

ONE TIME ONLY

R742R712,R713,R718,R719

USE

NO USE

PARTSNUMBER

C301-C304,C307,C308C311-C316,C319,C320C581,C582

NPT-1374P

NAPS-6633

T901

TO

NA

DIS

-663

4T

O N

AD

IS-6

634

TO

NA

DIS

-663

4T

O N

AD

IS-6

634

TO NAAF-6631TO NAAF-6631

TO NAAF-6632TO NAAF-6632

TO NAAF-6631

NAETC-6637

NADG-6630

LINE/DVD

TUNER

MD

REC

REC

PLAY

PLAY

RIGHT

LEFT

RIGHT

LEFT

RIGHT

LEFT

CD

LEFT

LEFT

RIGHT

RIGHT

LEFT

RIGHT

RIGHT

LEFT

IN

OUT

PROCESSOR

*

+B

1

+B

1

MU

TIN

G

S.B

AS

S1

S.B

AS

S2

S.B

AS

S3

PO

WE

R2

RL E NF

-R

NF

-L

PO

WE

R2 EE LL R R

EEE RRLL+

B2

-B2

*

*

-B1

+B1

HP-IN

DIRECT

KEYINMUTELED+5.6V

EREMIN

LED ALED B+5.6V

ESELIN2

SELIN1CLK

LATDATA

LchERch

SUBWOOFER PREOUT

L-OUT

R-OUTE

*

RI

P311B

P311B

TAPE

RIGHT

LEFT

RIGHT

LEFT

RIGHT

LEFT

RIGHT

LEFT

PLAY

REC

*

E-B1

-B1

BY MARK ARE CRITICAL FOR SAFETYIDENTIFIED

NOTE

THE COMPONENTS

REPLACE ONLY WITH PART NUMBER SPECIFIED.

.

. VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE. (NO INPUT SIGNAL)

. ALL PNP TRANSISTORS ARE EQUIVALENT

. ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED.

. ALL DIODES ARE EQUIVALENT TO 1SS133 UNLESS OTHERWISE NOTED.

. ELECTROLYTIC CAPACITORS ( ) ARE IN F/WV.

. ALL CAPACITORS ARE IN pF/50WV UNLESS OTHERWISE NOTED.

EX) 030 3pF 330 33pF 331 330pF

u

ALL RESISTORS ARE IN OHMS 1/4WATTS UNLESS OTHERWISE NOTED.. THE THICK LINES ON PC BOARD ARE THE PRINTING SIDE OF THE PARTS.

EX) PRINTING SIDE

CIRCUIT IS SUBJECT TO CHANGE FOR IMPROVEMENT..

.

TO 2SA1015-GR UNLESS OTHERWISE NOTED.

333 0.033uF

A

1

2

3

4

5

B C D E F G

A-905TX

SCHEMATIC DIAGRAM-2

U3

U2PREAMPLIFIER CIRCUIT PC BOARD

ACOUSTIC CIRCUIT PC BOARD

U5 DISPLAY CIRCUIT PC BOARD

-19.1

-23.4

-24.0

-23.4

-13.0

-6.9

-13.0

-6.9

-19.1 -19.7

-0.7

24.123.5

22.923.5

24.123.5

22.923.5

-0.7

-24.0-19.7

S401(1/2)

S401(2/2)

P401B

P501B

JL702A

P405A

D503

MTZJ5.6B

D504MTZJ5.6B

JL50

1A

JL50

1B

C420

104

C416

393

C424

153

C423

153

C415

393

C417474

C419

104

C418474

C410

104

C409

104

Q4142SK246

Q4132SK246

Q4092SK246

Q407

2SK246

Q410

2SK246

Q408

2SK246Q4062SK246

Q4052SK246 Q411

2SK246

Q4122SK246

Q402

NJM2068L-D

Q403

NJM2068L-D

Q402

NJM2068L-D

Q403

NJM2068L-D

Q404

NJM2068D-D

Q404

NJM2068D-D

Q401

NJM4565D-D

Q401

NJM4565D-D

S70

2

S70

1

P403B

P502B

JL701A

P583

Q711

DTA114ES

Q712DTA114ES

D720SPR-39MVW

Q418

RN1241

Q416

RN1241

Q417

RN1241

Q415

RN1241

Q708

DTC114ES

Q710

DTC124ES

Q709

DTC124ES

JL582A P461A

R458R458

R461250KW

U701REMSENS

D402

D502

D501

D746

D410

D409

D403

D405

D404

D406

D401

D408

D40

7

D710

D709

D72

1

SLR

-332

VR

D71

1S

LR-3

32V

R

D72

3

SE

L2E

10C

D71

6

SLR

-332

DU

D71

4

SLR

-332

DU

D71

7

SLR

-332

DU

D71

5

SLR

-332

DU

D71

3

SLR

-332

DU

D71

2

SLR

-332

DU

Q707 74HC595

D14

LC12

OE

13

QA

15

QB

1

QC

2

QD

3

QE

4

QF

5

QG

6

QH

7R

ES

10

SC

11

SQ

H9

VD

D16

VS

S8

R437(2/2)

100KW

R437(1/2)

100KW

R438(2/2)

100KW

R438(1/2)100KW

C509220/6.3

C71810/16

C519

100/50

C520

100/50

C502

22/50

C52

2

100/

50

C746

100/6.3

C71510/16

C71410/16

C514

10/50

C513

10/50

C51210/16

C521100/50

C501

22/50

C51110/16

C426

10/16

C425

10/16

C4122.2/50

C411

2.2/50

C42910/16

C43010/16

C407

47/50

C40847/50

C510220/6.3

C404

47/50

C403

47/50

C71710/16

Q5092SA992

Q5072SA992

Q511

2SA992

Q5082SA992

Q5102SA992

Q51

2

2SA

992

Q5052SC1740S

Q5012SC1845

Q503

2SC1845

Q5132SC1845

Q5022SC1845

Q5062SC1740S

Q5042SC1845

Q5142SC1845

C722

103Z

C5082P

C723

103Z

C503101

C504101

C724

223Z

C713223Z

C721

103Z

C5072P

C505101J

C421822

C422822

C427

153

C428

153C414

224

C413

224

C506

101J

C406

102J

C405

102J

C716223Z

R579820

R5133.3K

R5143.3K

R53382

(1/4W)

R5291.2K

(1/2W)

R522

22K

R521

22K

R731

100K

R730

100K

R50256K

R525820

(1/2W)

R5981.2K(1/2W)

R5971.2K

(1/2W)

R450

100K

R4461M

R46010K

R45910K

R721

10K

R74610K

R744560

R741

100K

R50

4 1K

R503

1K

R590

33

R58933

R57856K

R520100K

R457100K

R456100K

R455100K

R743

100K

R727330

R726390

R57756K

R517

470

R527820

(1/2W)

R523820

(1/2W)

R501

56K

R519100K

R515

2.7K

R509330

R505

1.8K

R5071.8K

R511330

R53718K

R53518K

R53182(1/4W)

R453220K

R4511K

R454220K

R4521K

R518

470

R528820

(1/2W)

R442

1K

R44

0

1M

R441

1K

R43

9

1M

R434

680

R4271.8K R425

1M

R4234.7K

R421220K

R433

680

R4291M

R435100K

R431

1M

R426

1M

R4281.8K

R422220K

R4244.7K

R430 1M

R436100K

R432

1M

R4141M

R4131M

R449100K

R445

1MR4151M

R419

180K

R447

1.2K

R4431M

R448

1.2K

R4441M

R4161M

R418

680

R420180K

R417

680

R580820

R530

1.2K

(1/2W)

R526

820

(1/2W)

R524820

(1/2W)

R516

2.7K

R5061.8K

R510330

R512330

R5081.8K

R53818K

R53618K

R53282

(1/4W)

R534

82(1/4W)

R4124.7K

R410220K

R4083.3K

R4063.3K

R4114.7K

R409220K

R4073.3K

R4053.3K

R402330

R401

330

R729

3.3K

R7283.3K

R724150

R403100K

R404100K

R585180

R586180

R587

180

R588

180

R723

560

R722

270

TONE

DIRECTSOURCE DIRECT

INPUT SELECTOR

RED GRN2

31

L-2(CDR)

L-1/DVD

TO NADG-6630TO NADG-6630

TO NADG-6630TO NADG-6630 TO NADG-6630 TO NADG-6630

TO NADG-6630

TO

NA

AF

-663

2

TO

NA

DIS

-663

4

TO NADG-6630

TO NADG-6630

NADIS-6634

NAETC-6635

NAAF-6631

NAAF-6632

DIR

EC

T

PO

WE

R2

MU

TE

PHONES

TD

RN

RO

RB

E

LB

LO

LN

TD

RN

RB

E

LB

LO

LN

RO

+B

2

-B2

SB

AS

S1

PO

WE

R2

RERLL

EEE NF

-E

NF

-E

R ER L L

LR NF

-L

NF

-R

ST-BY TAPEMDCD TUNER

HP

-IN

VOLUME

SB

AS

S3

SB

AS

S2

INP

MU

TE

-B +B E -B+BEEE

RE

MIN

E

+5.

6V

MU

TE

LED

KE

YIN

(2 /2)

(1/2)(2/2)

(2/2)

(2/2)

(1/2)(1/2)

Tone bass

R-I

N

L-IN

TREBLEBASS

(1/2)

AC

OS

TIC

PR

ES

EC

E

DA

TA

LAT

CLK

SE

LIN

1

SE

LIN

2

E +5.

6V

LED

B

LED

A

E

LchER

ch

BALANCE

ACOUSTIC PRESENCE

R732

PO

WE

R

VOL_IND

A

1

2

3

4

5

B C D E F G

A-905TX

PC BOARD CONNECTION DIAGRAMXXXXX

NAETC-6636

NAPS-6633

NAETC-6640

NAPS-6633

NADG-6630

NADG-6630

NADIS-6634

NAETC-6637

NAAF-6631

NAAF-6632

230V model only

NAETC-6639

AC IN

AC OUTLET

P584 P585B

P585A

P586B

P586A

JL581C

P910

P952B

P952B

P901

P951A

P951B

P954A

P954B

P912A

P902A P902B

P911A

T901

JL901A

JL582A

JL582B

J05B

J05A

J04B

J04A

J03B

J03A

JL702A

JL702B

JL701B

JL701A

JL461AP461A

P791A

JL501B

P912CP911C

P912AP911A

P913A

P914AP914B

P913B

P311B

P306 P305

REMOTECONTROL

LINE/DVDTUNER

TAPEPLAY REC

SUBWOOFERPRE OUT

MDPLAY REC

CDR/PCCD REC PLAY

PROCESSORIN OUT

P304P582 P303 P302 P301P351A

P351B

P311A

JL581A

P591A

P591B

P912B

P911B

P592A

P592B

JL901B

P307

P502B

P502A

P501BP501A

P403A

P401B

P403B

P405A

P405C

P461B

P401A

P405B

SPEAKERSR L

SPEARKERTERMINALPC BOARD

POWER SUPPLYPC BOARD

MAIN CIRCUITPC BOARD

DISPLAY CIRCUITPC BOARD

TERMINALPC BOARD

PREAMPLIFIERCIRCUITPC BOARD

ACOUSTICCIRCUITPC BOARD

POWER SWITCHPC BOARD

U10

U2

U3

U1

U7

U4

FUSE PC BOARD

POWER SUPPLYPC BOARD

U4

U9

U5

U8

MAIN CIRCUITPC BOARD

U1

A-905TX

PRINTED CIRCUIT BOARD PARTS LIST-1

MAIN CIRCUIT PC BOARD (NADG-6630-4B/C)CIRCUIT NO. PART NO. DESCRIPTION CIRCUIT NO. PART NO. DESCRIPTION

ICs

Rotary encoder

Q301 22240881 TC9273N-010

R732 25065534 REB161PVB

Q701 22241481 HD404316E30H

Relay

Q702 22240239 TA7291S

RL901 25065597 NRL-2P8A-DC12-147

Q713 222951 M51943B

Jacks

Q911 222780565JRC NJM78M56FA

P582 25045302 NPJ-1PDBL161

Transistors

P301-P303 25045303 NPJ-4PDBL162

Q405,Q406 2211945 2SK246-GR

P307 25045307 NPJ-2PDBL166

Q451 2213510 or DTA114ES or

Sockets

2215770 KRA102M

JL581A 25051088 NSCT-4P875

Q515,Q516 2211733 or 2SC1845-E or

JL582B 25055624 NPLG-3P586

2211732 2SC1845-F

JL701B 25055630 NPLG-9P592

Q517,Q518,Q533 2211792 or 2SA992-F or

JL702B 25055628 NPLG-7P590

2211793 2SA992-E

JL901A,JL901B 25051107 NSCT-3P894

Q519,Q520 2211643 or 2SA965-O or

P311A 25055709 NPLG-13P665

2211644 2SA965-Y

P351 2009990230 NSAS-6P0333

Q521,Q522 2211653 or 2SC2235-O or

P401A 25055706 NPLG-10P662

2211654 2SC2235-Y

P403A,P502A 25055702 NPLG-6P658

Q529,Q530,Q705 2213284 2SC1740S-R

P405 2009990565UL NSAS-14P0758

Q531,Q532 2211733 or 2SC1845-E or

P461B 25055133 NPLG-3P117

2211732 2SC1845-F

P501A 25055808 NPLG-19P764

Q703,Q714 221282 or DTC144ES or

P503,P504 25055038 NPLG-2P29

2215820 KRC104M

Retainer

Q704 2212600 or DTA124ES or

E851 27141749 (BUS)

2215780 KRA103MQ706 2213354 2SA933S-RQ912 2213640 DTC123JS

DiodesD701,D703,D704 223163 or 1SS133 or

PREAMPLIFIER CIRCUIT PC BOARD (NAAF-6631-4B/C)

223205 1SS270A

Transistors

D702,D914-D918 22380035 or GP104003E or

Q501-Q504 or 2211732 or 2SC1845-F or

22380046 AM01Z

2211733 2SC1845-E

D705 224470562 MTZJ5.6B

Q505,Q506 2213284 2SC1740S-R

D706,D708 223163 or 1SS133 or

Q507-Q512 or 2211792 or 2SA992-F or

223205 1SS270A

2211793 2SA992-E

D707,D745 224470512 MTZJ5.1B

Q513,Q514 or 2211732 or 2SC1845-F or

D722,D919 223163 or 1SS133 or

2211733 2SC1845-E

223205 1SS270A

Diodes

D911 22380022F or RBV402 or

D501,D502 223163 or 1SS133 or

22380271F D3SBA20

223205 1SS270A

D912,D913 224471203 MTZJ12C

D503,D504 224470562 MTZJ5.6B

Oscillator

Capacitors

X701 3010150 CST4.00MGW

C511,C512 354741009 10uF, 16V, Elect.

Coils

C509,C510 393322217 220uF, 6.3V, Elect.

L503-L506 5597-45502 FR core

C513,C514 393381007 10uF, 50V, Elect.

Capacitors

C519-C522 393381017 100uF, 50V, Elect.

C301-C304 374721015 100pF+/-10%, 50V, Plastic

C501,C502 393382207 22uF, 50V, Elect.

C307,C308 374721015 100pF+/-10%, 50V, Plastic

Resistors

C311,C312 374722215 220pF+/-10%, 50V, Plastic

R529,R530 443521224 1.2kohm +/-5%, 1/2W, Metal oxide

C321,C322,C922 393341007 10uF, 16V, Elect.

R597,R598 443521224 1.2kohm +/-5%, 1/2W, Metal oxide

C407,C408 393384707 47uF, 50V, Elect.

R523-R528 443528214 820ohm +/-5%, 1/2W, Metal oxide

C451,C452 353780229 2.2uF, 50V, Elect.

R531-R534 415428203 82ohm +/-5%, 1/4W, Carbon

C503,C504 374721015 100pF+/-10%, 50V, Plastic

R458 5104383 +N16RGL100KBT20F, Volume

C515,C516 393381007 10uF, 50V, Elect.

Sockets

C517,C518 374724734 0.047uF+/-5%, 50V, Plastic

P502B 25051231 NSCT-6P1021

C701 3000078 or DX-5R5L104 or

P501B 25051530 NSCT-19P1317

3000076 EECS5R5T104, Super capacitor

P405A 25055137 NPLG-7P121

C702 375524744 MMT50V-474JC703 354721019 100uF, 6.3V, Elect.C708 354780229 2.2uF, 50V, Elect.C711 354780109 1uF, 50V, Elect.C712,C912,C913 374721044 0.1uF+/-5%, 50V, PlasticC914,C915 3504317 3300uF, 35V, Elect.C916,C917 354743319 330uF, 16V, Elect.C918 374721034 0.01uF+/-5%, 50V, PlasticC919 354744709 47uF, 16V, Elect.C920 354742229S 2200uF, 16V, Elect.L501,L502 231176S S-1.3C

R543-R546 443521014 100ohm +/-5%, 1/2W, Metal oxideR547-R550 443521504 15ohm +/-5%, 1/2W, Metal oxideR551-R554 453530224 2.2ohm +/-5%, 1/2W, Metal oxideR555,R556 443528204 82ohm +/-5%, 1/2W, Metal oxideR557-R560 443521004 10ohm +/-5%, 1/2W, Metal oxideR561,R562 4500027 MPC708-2WK-0.22

R563,R564 453530474 4.7ohm +/-5%, 1/2W, Metal oxideR565,R566 453530824 8.2ohm +/-5%, 1/2W, Metal oxideR575,R576 5210257 N06HR500BC, TrimmingR593-R596,R917 443521004 10ohm +/-5%, 1/2W, Metal oxideR912-R915 443522714 270ohm +/-5%, 1/2W, Metal oxide

U1

U2

NOTE:<DT> : Asian model only for 120V<PT> : Asian model only for 230V

NOTE: THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE ONLY WITH PART NUMBER SPECIFIED.

Resistors

A-905TX

PRINTED CIRCUIT BOARD PARTS LIST-2

CIRCUIT NO. PART NO. DESCRIPTION CIRCUIT NO. PART NO. DESCRIPTION

Capacitors

Holders

C405,C406 374721024 1000pF+/-5%, 50V, Plastic

JL582A 25051087 NSCT-3P874

C409,C410 374721044 0.1uF+/-5%, 50V, Plastic

JL702A 25051091 NSCT-7P878

C419,C420 374721044 0.1uF+/-5%, 50V, Plastic

JL501A 25051092 NSCT-8P879

C427,C428 374721534 0.015uF+/-5%, 50V, Plastic

JL701A 25051093 NSCT-9P880

C413,C414 374722244 0.22uF+/-5%, 50V, PlasticC415,C416 374723934 0.039uF+/-5%, 50V, Plastic

D723A 27191018A (LED)

C417,C418 374724744 0.47uF+/-5%, 50V, PlasticC421,C422 374728224 8200pF+/-5%, 50V, Plastic

SPEAKER TERMINAL PC BOARD(NAETC-6636-4B/4C)

C425,C426 393341007 10uF, 16V, Elect.

CIRCUIT NO. PART NO. DESCRIPTION

C429,C430 393341007 10uF, 16V, Elect.

Terminal

C411,C412 393380227 2.2uF, 50V, Elect.

P584 25060193 NTM-4PDMN115, Speakers

C403,C404 393384707 47uF, 50V, Elect.

Wire holder

Sockets

JL581C 25051088 NSCT-4P875

P403B 25051231 NSCT-6P1021P401B 25051235 NSCT-10P1025JL501B 25055629 NPLG-8P591

TERMINAL PC BOARD (NAETC-6639-4B/4C)CIRCUIT NO. PART NO. DESCRIPTION

POWER SUPPLY PC BOARD (NAPS-6633-4B/4C)

Capacitors

CIRCUIT NO. PART NO. DESCRIPTION

C313-C316 374721015 100pF±10%, 50V, Plastic

Resistors

C319,C320 374721015 100pF±10%, 50V, Plastic

R916 453534794 0.47ohm ±5%, 1/2W, Metal oxide

Jacks

Socket

P304,P305 25045303 NPJ-4PDBL162

P910 25051637 NSCT-2P1424, AC Outlet <PT>

P306 25045330 NPJ-2PDBL184

25051990 NSCT-2P1777, Ac Outlet <DT>

Socket

Plug

P311B 25051238 NSCT-13P1028

P901A 25055676 NPLG-2P632Fuse holder

F901 25050065 YSH403T <JJ>

POWER SWITCH PC BOARD (NAETC-6639-4B/4C)

F902 25050065 YSH403T <PT>

CIRCUIT NO. PART NO. DESCRIPTION

Fuse label

Capacitors

F901C 29362519 T800mAL250V <PT>

C951 3300055 DE1610F103M-KHSwitch

S951 25035550 NPS-111-L512P, PowerCover

DISPLAY CIRCUIT PC BOARD(NADIS-6634-4B/AC)

C951A 27301216 SB1925A <PT>

CIRCUIT NO. PART NO. DESCRIPTIONICs

Q707 222745955 74HC595P

U701 241307 GP1U271X

FUSE PC BOARD (NAETC-6640-4C)

Transistors

CIRCUIT NO. PART NO. DESCRIPTION

Q409,Q410 2211945 2SK246-GR

Fuse holders

Q413,Q414 2211945 2SK246-GR

F903,F904 25050065 YSH403T <PT>

Q709,Q710 2213160 or DTC124ES or

Q708 2213290 or DTC114ES or

Q711,Q712 2213510 or DTA114ES or2215770 KRA102M

2215810 KRC103M

2215960 KRC102M

DiodesD409,D410 223163 or 1SS133 or

D709,D710,D746 223163 or 1SS133 or223205 1SS270A

223205 1SS270AD711 225338 SLR-332VRD720 225339 SPR-39MVWFD712-D717,D721 225340 SLR-332DUD723 225374 SEL2E10C

U4

U5

U7

U8

U10

U9

ACOUSTIC CIRCUIT PC BOARD (NAAF-6632-4B/C)

ICsQ401 22240191 NJM4565D-DQ402,Q403 22240250 NJM2068L-DQ404 222956 NJM2068D-D

TransistorsQ407,Q408 2211945 2SK246-GRQ411,Q412 2211945 2SK246-GRQ415,Q418 2213631 or RN1241-A or

2213632 RN1241-BDiodes

D401-D408 223163 or 1SS133 or223205 1SS270A

U3

CapacitorsC746 353721019 100uF0, 6.3V, Elect.C714,C715 353741009 10uF, 16V, Elect.C717,C718 353741009 10uF, 16V, Elect.C423,C424 374721534 0.015uF±5%, 50V, Plastic

R437 5104341 N14RHC100KWT20Z, BassR438 5104341 N14RHC100KWT20Z, TrebleR461 5104407 N12RGLC250KWT20, Balance

Rotary switchS401 25030415 NRSF-122-15SRB, Source direct

Push switchS701,S702 25035699 NPS-111-S662

JacksP583 25045396 LGT1516-0101, Headphone jack

Socket ASP461A 2009990296 NSAS-6P0429

NOTE:<DT> : Asian model only for 120V<PT> : Asian model only for 230V

NOTE: THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE ONLY WITH PART NUMBER SPECIFIED.

Remote sensor

LED Holder

Resistors

A-905TX

MICROPROCESSOR TERMINAL DESCRIPTIONQ701:HD404316-E30H

Pin No. Function I/O Descriptions

1 TEST I Test pin.

2 RESET I System reset input pin.

3 OSC1 I Pins to connect the ceramic oscillator 4.0MHz.

4 OSC2 O

5 GND I Ground pin.

6 AVSS I Analog reference ground for A/D converter.

7 SEL IN-1 I Rotary switch connection input pin for input selector.

8 SEL IN-2 I

9 KEY IN I Operation key connection pin.

10 905/909 I Initializing input pin for model selector.

11 RI OUT O System code output pin.

12 RI IN I System code input pin.

13 HP IN I Head phone switch position detector pin.

14 DIRECT I Direct switch position detector pin.

15 AVCC I Analog reference voltage for A/D converter.

16 VCC I Power supply pin (+5V).

17 POFF I Power failure detector pin.

18 REM IN I Remote control signal input pin.

19 NC O Speaker relay control signal output pin.

20 MUT LED O MUTING indicator control pin. Light on and off when the muting circuit turns on.

21 NC I No connection.

22 NC

23 VOL UP O Volume control output pin.

24 VOL DOWN O Volume control output pin.

25 POWER 2 Power amplifier control output pin.

26 INPMUT O Muting control output pin.

27 NC Connect to the ground.

28 NC Connect to the ground.

29 NC

30 NC

31 SBASS-1 O Acoustic Presence control output pin.

32 SBASS-2 O

33 SBASS-3 O

34 NC Connect to the ground.

35 NC Connect to the ground.

36 PROTECT I Speaker protect signal detector pin.

37 SBASS LEDA O Acoustic Presence indicator output pin.

38 SBASS LEDB O Acoustic Presence indicator output pin.

39 NC Connect to the ground.

40 CLK O Clock output pin of source selector and indicator ICs.

41 LAT O Latch output pin of source indicator IC.

42 DATA O Data output pin of source selector and indicator ICs.

43 CE O Chip enable output pin of source selector IC.

44 NC No connection.

A-905TX

MICROPROCESSOR CONNECTION DIAGRAMQ701:HD404316E04H

1234567891011

3435363738394041424344

3332313029282726252423

2221201918171615141312

SBASS-3

SBASS-2

SBASS-1

NC

NC

NC

NC

INP MUT

POWER2

VOL DOWN

VOL UP

TEST

RESET

OSC1

OSC2

GND

AVSS

SEL IN-1

SEL IN-2

KEY IN

905/909

RI OUT

NC

NC

PRO

TE

CT

SBA

SSLE

DA

SBA

SSLE

DB

NC

CL

K

LA

T

DA

TACE

NC

NC

NC

MU

T L

ED

RE

LA

Y

RE

M IN

POFF

VC

C

AV

CC

DIR

EC

T

HP IN

RI IN

Q708

Q912

+5V

+5.6V

S401PHONES

P583

P306

RIQ704

+5VACOUSTIC PRESENCES702

INPUTSELECTOR

R732

Q703

Q301TC9273N-010

Q70774HC595

GREENRED

Q702 TA7291S

Q505,Q506

MICROPROCESSORQ701HD404316-E30H

POWERS701

U701

D723

Q415-Q418

R459

SPEAKERRELAYSWITCH

POWER FAILURE DETECTOR

SOURCE DIRECT SWITCH

PROTECTER DETECTOR CIRCUIT

ACOUSTICPRESENCEINDICATOR

ACOUSTICPRESENCE CIRCUIT

VOLUMEINDICATOR

SOURCE INDICATORDRIVER

INPUT SELECTOR

SYSTEM RESET

BUFFER

MOTOR VOLUMEDRIVER IC

POWER AMPLIFIER CIRCUIT

POWER AMPLIFIRECONTROL

INPUT MUTING

VOLUME

REMOTE SENSOR

R569R570

R568R567

R561 R562L502

L502

C51

7

R56

5

R56

4

D911

C914

C914

R56

3

P502AC91

9

R708

D91

8

C92

0

C92

0

C917

C916

D70

7

R91

4

R915D913D912

L501

L501

C915

C915

P90

2B

BBBC C C CEEE

P504

IID

R912

R913

J547

J541J545

J539

J537

R560R558

R556J536

J543

R57

6

Q522

Q530

Q520

Q518Q516

R546

R550 R548

R544

R574

R57

2

R57

5

C515

R555 R559

Q519

Q52

1

Q51

5

Q529

Q517

R55

3

R55

1

R54

5

R54

3

R57

1

R57

3

J542

R54

9

R55

4C518R566J540

C51

6

R55

2

J529

J544J546

J528

P503

J548

JL58

2B

R59

5J5

14

J515

J519J518

J517R594

R596

R593

P501A

J524

J538

J901

P586A

P58

5A

J520

J516 J522

J521J523

R547

J535

R557

L505L503L506

J554

L504

J530

J04AJ03A

C53

1

Q53

2R

603

R60

1

R60

5

R60

7

R60

8

C53

2

R602

Q53

1

R604

J03B

J04B

R60

6

R610C533

Q533

R73

9

R740

J549

J527

J902

+B-B

Q523Q527 E B

Q525 Q526Q528 Q524

J550

+Vcc

-Vcc

ID

IDUP

UP

J531

J532 J5

33 J534

P591BP592B

P591AP592A

C912

C913

J05B

P911BP912B/P914B /P913B

Trimming resistorR576

Test pointP504

Trimming resistorR575

Test pointP503

Rch

Lch

Main circuit PC boardNADG-6630

1. Before Idling adjustment, turn the trimming resistors R575, R576 to counter clockwise.

2. Connect the DC voltmeter to terminal P503, P504.

3. After turn POWER to ON, adjust the trimming resistors R575, R576 so that the reading

of voltmeter becomes 2.0 mV.

4. After adjustment, attach the top cover.

5. Confirm the voltage of above points after five minutes.

6. When less than 2.5 mV : Readjust the trimming resistors above so that the voltage becomes 3.0 mV.

When 2.6 mV to 4.0 mV : It is not necessary to adjust.

When more than 4.1 mV : Readjust the trimming resistors above so that the voltage becomes 3.5 mV.

Note:No load and No signal

Input

50HzSquare wave

GND

3.3k

10k

1SS133 3.3k

0.01 F

Output

GND

Unit

Speakerterminal

Load

Oscillo-scope

AttenuatorDifferentiator

AF OscillatorCDTerminal

0.1 F 35Vp-p

Differentiator

Confirmation of Current detection circuit

1.Connect Differentiator below and apply the 50Hz square signal to the CD terminal.

2.Adjust the attenuator or Volume so that the output level becomes 35V p-p.

3.Confirm that the speaker relay turns OFF when a 0.5 ohm load is connected.

ADJUSTMENT PROCEDUERSIDLING CURRENT ADJUSTMENT

CONFIRMATION OF PROTECTION CIRCUITCONFIRMATION

A-905TX

A-905TX

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