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POWERED SUBWOOFER
MODEL
Black, Silver and Yellow models
B MDC
120V AC, 60Hz
B MPP
230-240V AC, 50Hz
S MPP
230-240V AC, 50Hz
SAFETY-RELATED COMPONENT
WARNING!!
COMPONENTS IDENTIFIED BY MARK
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.
SERVICE MANUAL
SERVICE MANUAL
SKW-204(B)/(S)/(Y)
S MPA
S MWT
Y MWT
230-240V AC, 50Hz
120/220-240V AC, 50/60Hz
120/220-240V AC, 50/60Hz
ON THE
SKW-204
Ref. No. 3946
052006
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Summary of Contents for Onkyo SKW-204(B)
- Page 1 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...
- Page 2 SKW-204 <Note> A05a EXPLODED VIEWS-1 S901 x 2 pcs. U04 (VOLTAGE SELECTOR PC BOARD) : MWT type only. AMPLIFIER SECTION F902 A103 P901 SP11 x 10 pcs. x 4 pcs. x 2 pcs. A102 A103 A101 SP12 Refer to "EXPLODED VIEWS-2" x 2 pcs.
- Page 3 SKW-204 EXPLODED VIEWS-2 SPEAKER SECTION SP01a - c SP07a / b SP06 SP04 x 6 pcs. SP09a - c SP08 SP02 x 4 pcs. SP04 x 4 pcs. SP05a / b SP11 x 2 pcs. SP03 x 4 pcs.
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Page 4: Schematic Diagram
SKW-204 SCHEMATIC DIAGRAM NAAF-8829 NAAF-8830 R101 FOR SKW-204AMP S101 MAIN PC BOARD PHASE SWITCH LINE INPUT Q301(1/2) P301 NJM4558LD R301 R307 220* C302 C955 47/50 R305 R315 223J 3.3K 22K* Q302(2/2) E801 NJM4558LD R316 R313 C303 C314 3.3K 47/16 C312 100/25 OUTPUT 334J... - Page 5 SKW-204 NOTE R101 R101(2/2) FREQUENCY ADJUSTMENT THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR SAFETY REPLACE ONLY WITH PART NUMBER SPECIFIED. PC BOARD FREQ. VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE.(NO INPUT SIGNAL). PHASE SWITCH AND FREQUENCY ADJUST. ALL PNP TRANSISTORS ARE EQUIVALENT TO 2SA1015-GR UNLESS OTHERWISE NOTED. P301B FOR SKW-204AMP ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED.
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Page 6: Component Side
SKW-204 PRINTED CIRCUIT BOARD VIEWS-1 MAIN PC BOARD (NAAF-8829) Component side R517 C315 Q517 R651 Q518 R545 C316 R541 R320 R319 Q503 R317 C506 C314 R544 J306 J303 Q509 R513 C312 J304 R528 Q513 J305 J307 C313 R511 Q519 R526 R316 R505 R312... - Page 7 SKW-204 PRINTED CIRCUIT BOARD VIEWS-2 POWER TRANSFORMER PC BOARD (NAPS-8831) Component side J905 J904 J903 J902 RISK OF FIRE P902A -REPLACE FUSE AS MARKED. P910A NCPS-8831 25138831 F901A F901B P907A 5A/125V F901...
- Page 8 SKW-204 PRINTED CIRCUIT BOARD VIEWS-3 FREQUENCY ADJUSTMENT PC BOARD (NAAF-8830) Component side S101 R101 R101 REVERSE NORMAL J101 J103 J102 NCAF-8830 P301B 25138830 VOLTAGE SELECTOR PC BOARD (NASW-8832) Component side T1.6A250V F902 F902A F902B <Note> MWT type only 120V 240V S902 POWER SWITCH PC BOARD (NASW-8833) Component side...
- Page 9 SKW-204 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.
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Page 10: Packing Procedure
SKW-204 PACKING PROCEDURE (Top) 04 : INNER 05 : OUTER L = 10 ft. (3 m) (Black / RCA) Front side (Bottom) 10a - d 10a - d 01a - f Front side... - Page 11 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/...
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