Onkyo SKW-204 User Manual

SERVICE MANUAL

SERVICE MANUAL

POWERED SUBWOOFER

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

SKW-204

Ref. No. 3946

052006

B MDC
B MPP
S MPP

Black, Silver and Yellow models

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

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.

S MPA
S MWT
Y MWT

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

SKW-204

EXPLODED VIEWS-1

AMPLIFIER SECTION

P901

A102

A103

A05

x 2 pcs.

A05

x 2 pcs.

A02

SP11

x 10 pcs.

A06

A02

U06

A101

A07

S901

A103

Q516

A05

x 4 pcs.

Q541

A08

x 2 pcs.

A05

A07

A01

A11

A05a

x 2 pcs.

A03

Q515

U02

SP12

x 4 pcs.

<Note>

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

F902
U04

U05

A04

Refer to "EXPLODED VIEWS-2"

SP13

x 2 pcs.

U03

T901

F901

<Note>

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

U01

A05

x 5 pcs.

SKW-204

F901C

EXPLODED VIEWS-2

SPEAKER SECTION

SKW-204

SP01a - c

SP07a / b

SP08

SP06

SP02

x 4 pcs.

SP04

x 4 pcs.

SP03

x 4 pcs.

SP05a / b

SP04

x 6 pcs.

SP09a - c

SP11

x 2 pcs.

SKW-204

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

A

PRINTED CIRCUIT BOARD VIEWS-1

1

2

3

4

MAIN PC BOARD (NAAF-8829)U01

Component side

NCAF-8829

1

BCE

J308

Q515

22

J323

B

CE

17

Q541

+Vcc

J334

C906

CEB

25

Q516

E701

R701

25138829A

J307

J314

J324

12

R531

C519

R533

D951

C951

J955

R952

7

C952

D952

P301

C955

R545

R544

P531

J325

J332

7

C906

D902

R526

-Vee

J956

P301

Q513

Q514

R508

J322

7

C526

J320

C520

J352

R901

BCD

R543

R542

J306

ECB

ECB

R514

Q510

Q506

Q507

J321

J340

C903 C904

RED REDBLK

R902

15

+Vcc

7

R301

R512

JL535B

RED

20

J330

J333

R951

D903

C301

C527

15

R528

C528

J331

17

17

P903A

R517
Q517
Q518

R541

12

J311

J312

J313

7

J319

JL535A

BLACK

C909

D901

R302

R510

J303

J304

C514

R516

C502

J351

D501

J305

Q519

R515

R904

R903

D904

C517

C504

12

Q504

R507

R527

P502A

C905

R513

C505

R509

C503

R502

R628

R629

J346

D606

R627

R504

Q502

C604

R625

R522

J347

Q609

R651

Q503

C506

C905

C950

R503

J310

R501

C501

R321

R302

Q505

Q501

20

7

Q604

R623

R624

R626

Q608

Q509

R521

J318

R619

Q606

D651

R511

R505

R506

J338

R615

Q607

7

7

J316

J326
J329

J348

J302

J349

J350

7

Q303

7654 3218

J301

7

Q302

R304

R303

J327

R617

R611

Q603

R622

C302

81234567

R306

R307

C303
R305

7

R610

R616

J341

7

Q301

R621

P632A

C313

R316

R312

R314

C311

R315

J309

J337

C316

R320

R319

R317

C314

C312

E801

R609

7

P631

J344

C315

R313

1

2345 678

Q602

P911

C601

R601

R602
C602

R604

R603

D601

D602

D603

R605

C603

P633

Q605

R620

D605

R614

R613

R612

J342

P912

J335

P301A

R311

J336

5

SKW-204

A

PRINTED CIRCUIT BOARD VIEWS-2

1

POWER TRANSFORMER PC BOARD (NAPS-8831)U03

Component side

15

15

2

P905A

BCD

J905

J904

810121416

15

15

T901

J903

J902

T901

3

2356

1

P902A

AC-G AC-H

AC-G

RISK

-REPLACE FUSE

OF

FIRE

AS MARKED.

AC-H

P910A

P910A

4

P906A

P907A

J901

F901A

1

5A/125V

NCPS-8831

25138831

F901B

F901

P903A

P903A

5

SKW-204

A

PRINTED CIRCUIT BOARD VIEWS-3

1

2

FREQUENCY ADJUSTMENT PC BOARD (NAAF-8830)U02

Component side

R101

R101

J101

P301B

BCD

1

S101

15

J103

J102

NCAF-8830

25138830

NORMALREVERSE

7

1

VOLTAGE SELECTOR PC BOARD (NASW-8832)U04

Component side

F902

P905B

3

AC-G AC-H

T1.6A250V

F902B

F902A

<Note>

1

25138832

NCSW-8832

120V

S902

S902

RISK OF FIRE

-REPLACE FUSE

240V

MWT type only

AS MARKED.

J908A

4

POWER SWITCH PC BOARD (NASW-8833)U05

Component side

S901

C901

P906B

J908B

BLACK

5

AC-G AC-H

NCSW-8833

25138833

1

ADJUSTMENT PROCEDURE

ADJUSTMENT OF IDLING CURRENT

[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.

100 ohm

(1/4W)

DC voltmeter

SKW-204

Trimming resistor

R544

Test point

P531

<Fig-1>

Test point

P531

MAIN PC board ass'y "NAAF-8829"

Test point

P631

Short

PACKING PROCEDURE

02

(Top)

07

11

SKW-204

TOP

04 : INNER
05 : OUTER

07

07

08

07

12

13

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

14

16

15

Front side

BOTTOM

03

09

(Bottom)

01a - f

SKW-204( )

SKW-204( )

Front side

10a - d

SKW-204( )

SKW-204( )

SKW-204( )

10a - d

09

SKW-204

ONKYO CORPORATION

Sales & Product Planning Div. : 2-1, Nisshin-cho, Neyagawa-shi, OSAKA 572-8540, JAPAN
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/

ONKYO EUROPE UK Office

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

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/

HOMEPAG

http://www.onkyo.com/

E