Onkyo SKW-204(B), SKW-204(S), SKW-204(Y) Service Manual

SKW-204

SERVICE MANUAL

SERVICE MANUAL

POWERED SUBWOOFER

Black, Silver and Yellow models

MODEL SKW-204(B)/(S)/(Y)

Ref. No. 3946

052006

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

B MDC
B MPP
S MPP

230-240V AC, 50Hz
120/220-240V AC, 50/60Hz
120/220-240V AC, 50/60Hz

S MPA
S MWT
Y MWT

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.

SKW-204

EXPLODED VIEWS-1

AMPLIFIER SECTION

SKW-204

SP12

x 4 pcs.

A05a

x 2 pcs.

A05

x 4 pcs.

A08

x 2 pcs.

SP11

x 10 pcs.

A05

x 2 pcs.

A05

x 2 pcs.

A05

x 5 pcs.

A103

A103

A102

P901

SP13

x 2 pcs.

U03

A11

A01

U01

A07

A07

A101

A02

A02

U06

U05

U04

U02

A05

Q515

Q516

Q541

F901

T901

A04

A03

F901C

S901

A06

F902

Refer to "EXPLODED VIEWS-2"

<Note>

U04 (VOLTAGE SELECTOR PC BOARD) : MWT type only.

<Note>

F901C (LABEL) : MPP/MPA type only.
Part No. (SN) ---> Refer to
"PRINTED CIRCUIT BOARD PARTS LIST".

SKW-204

EXPLODED VIEWS-2

SPEAKER SECTION

SKW-204

SP07a / b

SP09a - c

SP01a - c

SP04

x 6 pcs.

SP02

x 4 pcs.

SP04

x 4 pcs.

SP03

x 4 pcs.

SP08

SP05a / b

SP06

SP11

x 2 pcs.

SCHEMATIC DIAGRAM

SKW-204

A

1

2

3

4

5

BCDEFGH

J317

FOR SKW-204AMP

J316

FOR SKW-540AMP

S101

Q302(1/2)
NJM4558LD

3

8

2

4

1

E801

Q302(2/2)
NJM4558LD

4

8

5

6

7

Q301(2/2)
NJM4558LD

4

8

5

6

7

Q301(1/2)
NJM4558LD

3

2

1

8

4

Q602
KRC103M

Q606

KRA103M

P301

R651

12K

(1/2W)

R951

3.3K

POWER NEED TO CONFIRM

(2W)

R952

3.3K

(2W)

0

-0.6

0

0.05

0.6

5.0

5.6

R609

39K

R611

820K

R610

560K

R616

100K

R617

1K

R621

1K

R615

22K

R612

39K

R614

120K

R613

470K

R619

22K

R620

100K

R624
100K

R623

100K

R627
680K

R622

10K

R626

2.2M
R625
180K

P632A

RED

GREEN

D601
MTZJ2.7B

D602

MTZJ2.7B

D501

MTZJ5.6B

D952

MTZJ15C

D951

MTZJ15C

Q507

2SA949-Y

Q505

2SA949-Y

Q509

2SA949-Y

Q604

2SA933S

Q605

2SA933S

Q607

2SA933S

Q506

2SC2229-Y

Q510

2SC2229-Y

Q503

2SC2240-BL

Q502
2SC2240-BL

Q501

2SC2240-BL

Q603

2SC1740S-S

Q608

2SC1740S-S

P501B

P633

P631

D651

1SS133

D603

1SS133

D605

1SS133

R302

20K

R101

20K

C301

C303

NC

C955

223J

C313

124

C312

334J

C506

070

C502

NC

C505

020

C503

224J

C950

104/50

C311

100/25

C302
47/50

C314
47/16

C527
1/50

C501

47/50

C504
220/16

C951
220/16

C952
220/16

C601

10/50

C603

470/16

C602

10/50

C604

33/35

R306

47K

R301

1K

R311

100K

R313

3.3K

R312

100K

R314

3.3K

R315

3.3K

R307

220*

R305

22K*

R303

47K

R304

2.2K*

R316
10K

R508

47

(1/4W)

R511

82

(1/4W)

R512

68

(1/4W)

R514

82

R513

82
(1/4W)

R516

12K

R515

12K

R502

47K

R510

100K

R505

1K

(1/4W)

R506

1K

(1/4W)

R507

33K

R527
270

R509

1K

R504

2.2K

R503

5.6K

R522
220

R521

220

R501

1K

R603

150K

R601

5.6K

R605

22

R602

100K

R604

180

FOR SKW-204AMP

NAAF-8830

PHASE SWITCH

OFF

ON

NAAF-8829

224

(PP/PA/WT)

NC

NC

NC

MAIN PC BOARD

U01

LINE INPUT

OUTPUT
LEVEL

LED

<Note>

NC : No mount of parts.

SKW-204

P906B

P908B

P906A

P906A

P908A

P905B

P905B

P907A

P905A

P907A

T901
NPT-1539DQ

01

02

05

06

S902

P301A

P301B

Q303(1/2)
NJM4558LD

3

8

2

4

1

Q303(2/2)
NJM4558LD

4

8

5

6

7

R901

820

(1W)

R902

820

(1W)

1

1.6V

-1.6

-1

5.6

D901

D3SBA20

R544

100B

R528

390

(1/2W)

R628

330K

R629

NC

R701

NC

R904

1K

(1/2W)

R903

10K

S901

S901

P901

P901

F901

5A/125V

F902

1.6A/250V

F901

1.6A/250V

T901
NPT-1539P

P903B

P903B

J903A

D904

MTZJ5.6B

Q516

2SA1987-O/R

Q519

2SA965-Y

Q517

2SA933S-S

Q514

2SA1930

Q541

2SC3423

Q515

2SC5359-O/R

Q513

2SC5171

Q518

2SC2235-Y

Q609

NC

P906B

P902A

P902A

JL535A/B

P531

D606

1SS133

D903
RL1N4003
or GP104003E

D902
RL1N4003
or GP104003E

R101(2/2)

20K

20K

C316

124

C315

334J

C514

101

C520

224

C519

224

C903

104J/100

C904

104J/100

C517

10/50

C528

10/50

C526

10/50

C909
22/50

C604

33/35

C906

5600/71

C905

5600/71

R317

2.2K

R321

1K

R320

10K

R319

100K

R531

0.22

(5W)

R533

3.3
(1W)

R514

82

(1/4W)

R513

82
(1/4W)

R543

180

R526

82

(1/2W)

R517

3.3K

R541

820

R542

150

MWT

MPP/MPA

NAPS-8831

NASW-8832

NASW-8833

NAPS-8831

NASW-8833

FOR SKW-204AMP

PHASE SWITCH AND FREQUENCY ADJUST.

P906A

P907A

S901

P901

F901

5A/125V

T901
NPT-1539D

P903B

P906B

P902A

MDC

NASW-8833

NAPS-8831

NC

NC

+5.6V

AGAINST FIRE HAZARD, REPLACE

VA

FOR CONTINUED PROTECTION

AND RATING INDICATED.

ONLY WITH FUSE OF SAME TYPE

CAUTION ATTENTION

ET CALIBRATION COMME INDIQUE.

D'INCENDIE, REMPLACER UNIQUEMENT

PERMANENTE CONTRE LES RISQUES

AFIN D'ASSURER UNE PROTECTION

PAR UN FUSIBLE DE MEME TYPE

VA

E LENT.POUR UNE PROTECTION PERMANENTE,N'UTILISER

INDIQUE LA QU LE PRESENT SYMBOL EST APPOSE.

QUE DES FUSIBLES DE MEME TYPE. CE DARNIER EST

CE SYMBOLE INDIQUE QUE LE FUSIBLE UTLISE EST

FOR CONTINUED PROTECTION AGAINST FIRE

RATING REFER TO THE MARKING ADJACENT TO THE SYMBOL.

HAZARD,REPLACE WITH SAME TYPE FUSE. FOR FUSE

THIS SYMBOL LOCATED NEAR THE FUSE INDICATES
THAT THE FUSE USED IS SLOW OPERATING TYPE

THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR SAFETY
REPLACE ONLY WITH PART NUMBER SPECIFIED.
VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE.(NO INPUT SIGNAL).
ALL PNP TRANSISTORS ARE EQUIVALENT TO 2SA1015-GR UNLESS OTHERWISE NOTED.
ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED.
ALL DIODES ARE EQUIVALENT TO 1SS133 UNLESS OTHERWISE NOTED.
ELECTROLYTIC CAPACITORS ( ) ARE IN uF/WV.
ALL CAPACITORS ARE IN pF/50WV UNLESS OTHERWISE NOTED.
EX) 030- 3pF 330- 33pF 331- 330pF 333- 0.033uF
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.

!

NOTE

POWER SWITCH
PC BOARD

U05

POWER
TRANSFORMER
PC BOARD

U03

POWER
SWITCH

SPEAKER

MPP/MPA

ADJUST.
IDLING

Hi

Hi

Lo

VOLTAGE
SELECTOR
PC BOARD

U04

MWT

Lo

MWT

FREQUENCY ADJUSTMENT
PC BOARD

U02

POWER
SWITCH

MDC

FREQ.

SKW-204

PRINTED CIRCUIT BOARD VIEWS-1

MAIN PC BOARD (NAAF-8829)U01

Component side

R544

P502A

Q517

R543

R533

Q515

C502

R527

C514

J332

Q541

Q516

R522

R521

J322

R513

R511

J334

R516

R515

R507

R504

R510

C503

R651

R503

R509

R501

R502

C504

C951

R517

R542

R541

Q510

Q506

Q507

R514

R512

R508

C526

C517

C506

Q505

Q509

Q503

C505

J310

Q502

Q501

R505

R506

C501

C519

C520

J323

NCAF-8829

1

25138829A

P531

R531

J324

J308

C527

C903 C904

Q518

Q519

C528

J306

J311

J305

J312

R528

R526

J304

J303

J321

J313

J319

C952

J307

Q514

Q513

J330

J340

J333

D903

D902

R902

R901

C909

R903

D904

R605

C602

R604

R603

R602

R904

C604

R622

Q608

R626

R624

Q606

Q607

Q604

R619

R623

R621

Q603

Q605

D605

Q602

R610

C603

R601

J346

J331

D952

D951

J320

J314

J325

D651

P632A

J336

J335

JL535A

JL535B

P633

RED

BLACK

BCE

CEB

B

CE

ECB

ECB

1

-Vee

+Vcc

+Vcc

J352

J351

C601

D603

R304

R305

R303

R307

J316

R620

R614

R613

R612

R302

R302

P301

P301

C955

R627

Q609

R629

R628

D606

R625

J348

R611

J337

J327

J326

R616

J342

R301

J344

R617

J338

J347

R609

J341

J318

C950

R314

R311

C311

R315

R312

C316

R313

R316

81234567

R319

C314

R317

7654 3218

R320

J302

C303

J309

J329

R615

J349

J350

2345 678

P911

J301

D501

R545

Q504

P903A

RED REDBLK

Q301

Q302

Q303

R701

E701

C301

P631

P912

C906

C906

C905

C905

R952

J955

R951

E801

D601

D602

C302

R306

D901

J956

P301A

C312

C315

R321

C313

7

25

12

22

17

15

12

15

7

20

7

17

12

17

7

20

7

7

7

7

7

7

7

7

7

A

1

2

3

4

5

BCD

SKW-204

PRINTED CIRCUIT BOARD VIEWS-2

POWER TRANSFORMER PC BOARD (NAPS-8831)U03

Component side

NCPS-8831

25138831

1

2356

810121416

AC-H

AC-G

P902A

F901A

F901B

5A/125V

F901

1

P905A

P907A

P906A

J901

J905

J903

J904

J902

T901

T901

P910A

P910A

P903A

P903A

AC-G AC-H

RISK

OF

FIRE

-REPLACE FUSE
AS MARKED.

15

15

15

15

A

1

2

3

4

5

BCD

SKW-204

PRINTED CIRCUIT BOARD VIEWS-3

FREQUENCY ADJUSTMENT PC BOARD (NAAF-8830)U02

Component side

VOLTAGE SELECTOR PC BOARD (NASW-8832)U04

Component side

POWER SWITCH PC BOARD (NASW-8833)U05

Component side

<Note>

MWT type only

NCAF-8830

25138830

1

NORMALREVERSE

1

R101

R101

P301B

J101

J103

J102

S101

NCSW-8832

25138832

1

F902A

120V

F902B

F902

T1.6A250V

S902

S902

P905B

240V

J908A

AC-G AC-H

NCSW-8833

25138833

1

S901

C901

P906B

J908B

BLACK

AC-G AC-H

RISK OF FIRE

-REPLACE FUSE

AS MARKED.

15

7

A

1

2

3

4

5

BCD

ADJUSTMENT PROCEDURE

ADJUSTMENT OF IDLING CURRENT

SKW-204

Test point

DC voltmeter

100 ohm

(1/4W)

P531

<Fig-1>

Test point

P631

MAIN PC board ass'y "NAAF-8829"

Test point

P531

Trimming resistor

R544

Short

[When]

1. Exchange transistors (Q505 - Q519).

2. Exchange MAIN PC board ass'y (NAAF-8829).

[Procedure]

<Note> No speaker load and No input signal.

1. Short test point P631 for amplifier is under active mode.

2. Adjust the trimming resistor R544 so that the reading of multimeter becomes 52 ohm to 53 ohm.

3. Connect the DC voltmeter to test point P531. <Fig-1>

4. Connect the AC power cord into a wall outlet.

5. Press POWER button to turn on the unit.

6. Confirm the voltage of above point after 6 minutes to 8 minutes. (Heat running)

7. When less than 3.20 mV : Readjust the trimming resistor above so that the voltage becomes 4.5 mV to 5.0 mV.
When 3.30 mV to 5.20 mV : Not necessary to adjust.
When 5.21 mV to 10.0 mV : Readjust the trimming resistor above so that the voltage becomes 5.0 mV to 5.5 mV.
When 10.1 mV to 20.0 mV : Readjust the trimming resistor above so that the voltage becomes 5.6 mV to 6.0 mV.

8. Press POWER button to turn off the unit.

9. Disconnect the DC voltmeter.

10. Disconnect the AC power cord from a wall outlet.

SKW-204

PACKING PROCEDURE

TOP

BOTTOM

SKW-204( )

SKW-204( )

SKW-204( )

SKW-204( )

SKW-204( )

11

10a - d

07

10a - d

09

01a - f

09

02

(Top)

03

(Bottom)

07

07

12

L = 10 ft.
(3 m)
(Black / RCA)

13

04 : INNER
05 : OUTER

07

08

14

15

16

Front side

Front side

SKW-204

ONKYO EUROPE UK Office

Suite 1, Gregories Court, Gregories Road, Beaconsfield, Buckinghamshire, HP9 1HQ
UNITED KINGDOM Tel: [phone] Fax: [phone]

ONKYO U.S.A. CORPORATION

18 Park Way, Upper Saddle River, N.J. 07458, U.S.A.
Tel: [phone] Fax: [phone] http://www.us.onkyo.com/

ONKYO EUROPE ELECTRONICS GmbH

Liegnitzerstrasse 6, 82194 Groebenzell, GERMANY
Tel: [phone] Fax: [phone] http://www.eu.onkyo.com/

Sales & Product Planning Div. : 2-1, Nisshin-cho, Neyagawa-shi, OSAKA 572-8540, JAPAN
Tel: [phone] Fax: [phone]

ONKYO CORPORATION

http://www.onkyo.com/

HOMEPAG

E

ONKYO CHINA LIMITED

Units 2102-2107, Metroplaza Tower I, 223 Hing Fong Road, Kwai Chung,
N.T., HONG KONG Tel: [phone] Fax: [phone]
http://www.ch.onkyo.com/