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SKW-204
Ref. No. 3946 052006

SERVICE MANUAL

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

Black, Silver and Yellow models B MDC 120V AC, 60Hz B MPP 230-240V AC, 50Hz S MPP 230-240V AC, 50Hz S MPA 230-240V AC, 50Hz S MWT 120/220-240V AC, 50/60Hz Y MWT 120/220-240V AC, 50/60Hz

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
P901 A05 x 2 pcs. A102 A103 A05 x 2 pcs. SP11 x 10 pcs. A02

S901 A103 A05 x 4 pcs.

A05a x 2 pcs.

U04 (VOLTAGE SELECTOR PC BOARD) : MWT type only. F902 U04 U05

A03 A101 Q516 A07 A08 x 2 pcs. A05 Q541

A04 U02 SP12 x 4 pcs. Refer to "EXPLODED VIEWS-2" SP13 x 2 pcs. U03

A06

U06

A02 A07 A01 A11 Q515

T901

F901

U01

A05 x 5 pcs.

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

SKW-204

F901C

SKW-204

EXPLODED VIEWS-2
SPEAKER SECTION

SP01a - c

SP07a / b SP06 SP08 SP04 x 6 pcs. SP09a - c

SP02 x 4 pcs. SP04 x 4 pcs. SP03 x 4 pcs.

SP05a / b

SP11 x 2 pcs.

SKW-204

SKW-204
A B
NAAF-8829
FOR SKW-204AMP

C
NAAF-8830
PHASE SWITCH
OFF

D
S101 ON

SCHEMATIC DIAGRAM
LINE INPUT
P301

R101 20K

U01 MAIN PC BOARD 1
C955 223J E801 R301 1K (PP/PA/WT) 224 R302 20K C301 C302 47/50 3 2 Q301(1/2) NJM4558LD 8 1 4 R305 22K* R303 47K R304 2.2K* C303 NC

R307 FOR SKW-540AMP 220* R306

J316 NC

47K

R315 3.3K R313 3.3K 100/25 R311 100K R312 100K 2 3 R314 3.3K 1 8 Q302(1/2) NJM4558LD 4 R316 10K 5 C312 334J C313 124 6 4 8

Q302(2/2) NJM4558LD 7 C314 47/16

OUTPUT LEVEL

C311

2

J317 FOR SKW-204AMP R505 1K (1/4W) R506 1K (1/4W) R511 82 (1/4W)

Q509 2SA949-Y

R51 82 (1

NC : No mount of parts.
Q501 2SC2240-BL 0 C503 224J R521 220 Q502 2SC2240-BL

Q505 2SA949-Y C506 R515 12K R516 12K 2SC2229-Y Q510 Q506 2SC2229-Y R512 68 (1/4W) 070

C501 R501 R951 MTZJ15C MTZJ15C 3.3K (2W) D951 P501B NC POWER NEED TO CONFIRM C502 NC C951 220/16 47/50 1K R502 47K

C505 020 -0.6 R522 220 R503 5.6K R509 1K R507 33K Q507 2SA949-Y 0

3

C952 220/16

D952 R952 3.3K (2W) 12K (1/2W)

R651

C527 1/50

D501 MTZJ5.6B

R510 100K

Q503 2SC2240-BL

R508 47 R527 270 (1/4W) C504 220/16

1SS133

D651

R504 2.2K

R51 82

4

10/50

C601

2SA933S Q604

5. Q301(2/2) NJM4558LD 8 5 7 6 4 R603 150K D602 D601 MTZJ2.7B MTZJ2.7B

R601

5.6K

D603 1SS133 R605 22 R609 470/16 C603 39K

Q603 2SC1740S-S R610 820K R611 560K R619 22K

Q606 KRA103M P631 Q607 2SA933S

5.0 R624 100K

R623 100K Q608 2SC1740S-S R626

0.05 0.6

P633

470K NC 120K Q602 KRC103M R614 R612 39K R613 D605 1SS133 R617 1K R615 22K C950 104/50 P632A GREEN RED R620 100K Q605 2SA933S

R627 680K

R602 C602 180

10/50 R604

100K

5

R616 100K

R621 1K

2.2M R622 10K R625 180K

C60

33/3

LED

SKW-204
E
R101(2/2) 20K

F
NOTE

G

H

R101 20K

FREQ.
P301B

U02 FREQUENCY ADJUSTMENT PC BOARD
PHASE SWITCH AND FREQUENCY ADJUST. FOR SKW-204AMP

P301A

R317

314 7/16 R319 100K

R320 10K C315 334J

5 6

8

Q303(2/2) NJM4558LD 7

3 2

Q303(1/2) NJM4558LD 8 1 4
A V

2.2K

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.

CAUTION
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH FUSE OF SAME TYPE AND RATING INDICATED.
A V

ATTENTION
AFIN D'ASSURER UNE PROTECTION PERMANENTE CONTRE LES RISQUES D'INCENDIE, REMPLACER UNIQUEMENT PAR UN FUSIBLE DE MEME TYPE ET CALIBRATION COMME INDIQUE.

C316 124

R321 1K

4

THIS SYMBOL LOCATED NEAR THE FUSE INDICATES THAT THE FUSE USED IS SLOW OPERATING TYPE FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE WITH SAME TYPE FUSE. FOR FUSE RATING REFER TO THE MARKING ADJACENT TO THE SYMBOL.

R513 82 (1/4W) Q517 2SA933S-S R541 820 -1 Q541 2SC3423 R517 3.3K 1 C517 10/50

Q518 2SC2235-Y 1.6V Q513 Q515 2SC5359-O/R 2SC5171 R528 390 (1/2W) R526 82 (1/2W) R531 0.22 (5W) 10/50 C528 C526 10/50 2SA1987-O/R R543 180 -1.6 Q519 2SA965-Y Q514 2SA1930 C519 224 C520 224 Q516 R533 3.3 (1W)

CE SYMBOLE INDIQUE QUE LE FUSIBLE UTLISE EST E LENT.POUR UNE PROTECTION PERMANENTE,N'UTILISER QUE DES FUSIBLES DE MEME TYPE. CE DARNIER EST INDIQUE LA QU LE PRESENT SYMBOL EST APPOSE.

P531

SPEAKER
JL535A/B

U03 POWER TRANSFORMER PC BOARD
MWT

U04 VOLTAGE SELECTOR PC BOARD
MWT
Lo P905B S902 F902 S901 P901 P901

R542 150 100B R544

NAPS-8831

NASW-8832
Lo Hi

T901 NPT-1539DQ 06 P903B

P905A

Y

ADJUST. IDLING

P905B Hi

5A/125V P907A 05 F901 02 01 P906A P908A

1.6A/250V P908B P906B

R514 82 (1/4W)

C514 101

NASW-8833
MWT

P902A

5.6

+5.6V

MPP/MPA
P903B T901 NPT-1539P

NAPS-8831
F901 1.6A/250V P907A P906A

U05 POWER SWITCH PC BOARD
NASW-8833
P906B S901

MPP/MPA POWER SWITCH

D606 1SS133 MTZJ5.6B R628 330K R629 NC C604 33/35 Q609 NC R701 NC

R904 1K (1/2W) D904 10K R903

R901 820 (1W) R902 820(1W) C909 22/50

D902 RL1N4003 or GP104003E 104J/100 NC D903 RL1N4003 or GP104003E

D901 D3SBA20

C903

R627 680K

P902A

C905 5600/71

J903A

MDC
P903B T901 NPT-1539D

NAPS-8831
F901 5A/125V P907A P906A P906B S901

NASW-8833
MDC POWER SWITCH

5600/71

C904

C906

104J/100 NC

P902A

P901

SKW-204
A B C D

PRINTED CIRCUIT BOARD VIEWS-1

1

U01 MAIN PC BOARD (NAAF-8829)
Component side

NCAF-8829 25138829A

R545 R543 C527 R542
15

R517 Q517 Q518 R541

C315 P912 C316 R320 R319 R317 C314 C312 C313 P301A R316 R312 R314 C311 R315 R313 J309 R311
8

Q303

8

R651 D651

Q504 R504

D501 R510

7 6 5

J301

Q503 C506

4

3 2 7

R544 1

J306
E C B

12

J303 J304 J305 Q519 C517 R513 Q509 J302 R511 R505 R506 Q505 C505 R503 Q502 J310 R522 Q501 R521

1

R528

2
B

J307

Q513 R526 C528

7

J314 J308 22 Q515 J323
12 17

6

Q514
E

Q302

R514

C

15

B

5

J311 J312 C514

4

C526

P531

C E B C E

3 2

Q510 R508
-Vee

1

Q506 Q507

R512

P911 E801

R509

R516

R515

R507

J313
7

7

C503 R502

R501 C501 R306 R307

C504

R527

J319

J324 J325 R531

JL535B RED

J321

J320

J322

C601 R601 R602 C602 R604 R603 D601 D602 D603 R605 C603
1

P502A

3

C502 JL535A
20 +Vcc

R321
20

C303 J316 J318 R304 R303 Q301 R305

Q541

C519

C520

C905

7

2

+Vcc

R533

7

J332

BLACK J330

3

J334
B C 25 E

4

C906 C906 J333
17

5

C905
7 7

6

J327
7

7

J326 J329

8

R610 P633 R621 J338 P632A

J331
17

J340

Q516 D951 C951
7

R609 J335 J336

7

R951

D901 C950 Q604 J346
12

R615 R616 R617 J341 R611

4
J955 R952

Q602

Q607 J348 J349

Q605 R620 D605 R614 R613 R612 J342

R619

J337

J956 J352
7

C903

C904 J351

J347 C604 R628 D606

7

Q606 R623 Q603

C952 E701 R701 C955 D902 D952

RED

BLK RED P903A D903

R904 D904 R903

P631

Q609 R624 R625 R627 Q608 R302 R302 R626 R629

J350

R901 P301 P301

R902

7

J344

R301 C301

R622 C302

C909

5

SKW-204
A B C D

PRINTED CIRCUIT BOARD VIEWS-2

1 U03 POWER TRANSFORMER PC BOARD (NAPS-8831)
Component side

15

J905 8 J904

2

15

P905A 6 5 T901

10

15 15

J903 J902 12 T901

3

3 14 2 16 1 P902A

RISK OF FIRE -REPLACE FUSE AS MARKED.
P910A P910A

AC-G

AC-G AC-H

AC-H

4
P906A J901

1 F901A

NCPS-8831 25138831 F901B

P903A

P903A

P907A

5A/125V

F901

5

SKW-204
A B C D

PRINTED CIRCUIT BOARD VIEWS-3

1

U02 FREQUENCY ADJUSTMENT PC BOARD (NAAF-8830)
Component side

S101 R101 R101 J101
15

1

REVERSE J102

J103

7

NORMAL

2

P301B

NCAF-8830 1 25138830

U04 VOLTAGE SELECTOR PC BOARD (NASW-8832)
Component side
F902 AC-H P905B

T1.6A250V
F902A

3

AC-G

RISK OF FIRE -REPLACE FUSE AS MARKED.
J908A

F902B

1

MWT type only

S902

NCSW-8832 25138832 120V

S902

240V

4

U05 POWER SWITCH PC BOARD (NASW-8833)
Component side

AC-H

P906B

BLACK J908B

C901

S901

NCSW-8833 25138833

AC-G

5

1

SKW-204 ADJUSTMENT PROCEDURE
ADJUSTMENT OF IDLING CURRENT
[When] 1. Exchange transistors (Q505 - Q519). 2. Exchange MAIN PC board ass'y (NAAF-8829). [Procedure] 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. 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



Test point

Trimming resistor

Test point

R544

P531

P531

MAIN PC board ass'y "NAAF-8829"

Test point

P631
Short

SKW-204 PACKING PROCEDURE

07 11 13 12
L = 10 ft. (3 m) (Black / RCA)

04 : INNER 05 : OUTER

TO

P

02 (Top)

14

16 07

15

07 Front side
B O TT O

07

M

08

03 (Bottom)
)

09

SK 10a - d SK W20
4( )

W20

4(

)

4(

)

S

-20 KW

01a - f Front side

S
S -20 KW 4( )

KW -20

4(

10a - d 09

SKW-204

ONKYO CORPORATION Sales & Product Planning Div. : 2-1, Nisshin-cho, Neyagawa-shi, OSAKA 572-8540, JAPAN Tel: 072-831-8023 Fax: 072-831-8124 ONKYO U.S.A. CORPORATION 18 Park Way, Upper Saddle River, N.J. 07458, U.S.A. Tel: 201-785-2600 Fax: 201-785-2650 http://www.us.onkyo.com/ ONKYO EUROPE ELECTRONICS GmbH Liegnitzerstrasse 6, 82194 Groebenzell, GERMANY Tel: +49-8142-4401-0 Fax: +49-8142-4401-555 http://www.eu.onkyo.com/ ONKYO EUROPE UK Office Suite 1, Gregories Court, Gregories Road, Beaconsfield, Buckinghamshire, HP9 1HQ UNITED KINGDOM Tel: +44-(0)1494-681515 Fax: +44(0)-1494-680452 ONKYO CHINA LIMITED Units 2102-2107, Metroplaza Tower I, 223 Hing Fong Road, Kwai Chung, N.T., HONG KONG Tel: 852-2429-3118 Fax: 852-2428-9039 http://www.ch.onkyo.com/

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