R SERVICE MANUAL Ref. No. 3699 07200 POWERED SUBWOOFER MODEL SKW-50 MDD 20V AC,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 NUMBER 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.
SPECIFICATIONS Type Bass-reflex with built-in power Speaker 20-cm woofer amplifier Power supply AC 20V,60Hz Use For superbass-range Power consumption 70W reproduction Dimensions(W x H x D) 235 x 490 x 409(mm) Frequency response 30-200Hz 9-/4" x 9-5/6" x 6-/8" (at maximum crossover frequency) Weight 2.5kg Crossover frequency 50-200Hz(variable) 27.6lbs Maximam output power 60W Input impedance 4.7kohm Accessory Pin connector cable(pc.) (for speaker-level input terminals) Spacers(4pcs.) 2kohm Instruction manual (for low-level inputjacks) Other AUTO STANDBY ON/OFF (with CANCELLING Switch) Sensitivity Speaker-level 2V Line 45mV SERVICE PROCEDURES. Replacing the fuse This symbol located near the fuses indicates that the fuse used is fast operating type. For continued protection against fire hazard, replace with same type fuse. For fuse rating refer to the marking adjacent to the symbol. Ce symbole indique que le fusible utlise est a rapide. Pour une protection permanente, n'untiliser que fusibles de meme type. Ce darnier est la qu le present symbol est appse. CIRCUIT NO. PART NO. DESCRIPTION F90 25259 or 2A-UL/T237,Fuse or 252253 2A-T/UL-ST2
PANEL VIEW Frequency adjusting knob Output level adjusting knob POWERED SUBWOOFER FREQUENCY OUTPUT LEVEL 50Hz 200Hz MIN MAX POWER Power switch and indicator Speaker-level input terminals SPEAKER LEVEL + R L + LINE AUTO STANDBY FROM AMP/RECEIVER L (MONO) OFF ON OUTPUT TO SPEAKERS + R L + R Speaker-level output terminals Low-level input jacks Auto standby switch To AC outlet
REAR PANEL CONNECTION Connection with amplifier's special subwoofer jack SPEAKER LEVEL + R L + LINE AUTO STANDBY FROM AMP/RECEIVER OUTPUT TO SPEAKERS + R L + L (MONO) R OFF ON If your receiver(amplifier)is equipped with a monaural subwoofer jack,connect it to the SKW-50 Left (LINE )jack. Preamplifier Output terminals Connection with a preamplifier L R SPEAKER LEVEL + R L + LINE AUTO STANDBY FROM AMP/RECEIVER L (MONO) OFF ON OUTPUT TO SPEAKERS + R L + R + R L + Connection with receiver's(amplifier's) speaker terminals FROM AMP/RECEIVER SPEAKER LEVEL + R L + OUTPUT TO SPEAKERS + R L +
OUTPUT FROM AMP/RECEIVER TO SPEAKERS (MONO) SPEAKER LEVEL LINE AUTO STANDBY L R OFF ON B4 B28 B2 B23 B8 B27 B9 B20 B7 A8 A7 A3 A2 A8 U3 Q95 Q952 Q56 Q54 A Q55 R602 A3 A23 U T90 F90 U5 A9 A4 A20 P90 A6 A5 U2 U4 U9 U8 U7 B6 A B3 B0 B25 A6 A3 P535 A22 B8 B6 B4 B24 SKW-50 EXPRODED VIEW
PARTS LIST EXPLODED VIEW REF NO. PART NO. DESCRIPTION A 2760467 Heat sink A3 2730745 Bracket A6 27466 Retainer A8 2884777 Cover A 29-00-076-2 Cushion A2 284475 t2x5x60,cushion A3 284476 t2x5x80,cushion A4 2722895A Rear panel A6 83044009 4TTC+0C(BC),Self tapping screw A7 284473 t2x5x45,cushion A8 284474 t2x5x95,cushion A9 284334 Cushion A20 273094 Cord,bushing A22 260208 Binder A23 22302 TBM-5W 9043,Isolation sheet B2 W2070A Speaker ass'y B3 AZ200003-0 Cabinet ass'y B7 3-000-038-6 05-5 L=95,Paper duct B8 29-00-076- Cushion B9 5-000-9-0 Box ass'y B0 AZ000084-0 Base ass'y B4 54-000-22-0 VHZ 30t*50*50,Sound absorbent B6 58-000-30-0 Cover B7 57-000-58-0 Panel B8 58-000-302-0 Foot B9 58-000-303-0 Knob(A) B20 58-000-304-0 Knob(B) B23 70-05-450-0 4*50,Self tapping screw B24 70-05-44-0 4*4,Self tapping screw B27 7-079-800-03 Nuts F90 25259 or 2A-UL/T-237,Fuse 252253 2A-T/UL-ST2,Fuse P535 20099906UL NSAS-2P0833,Socket P90 253272HIT AS-UC-6#8,Power supply cord Q55 2203063 or 2SC598-O,Transistor 2203062 or 2SC598-R,Transistor 2202524 or 2SC4468-Y,Transistor 2202526 or 2SC4468-P,Transistor 2202523 2SC4468-O,Transistor Q56 2203053 or 2SA94-O,Transistor 2203052 or 2SA94-R,Transistor 220254 or 2SA695-Y,Transistor 220256 or 2SA695-P,Transistor 220253 2SA695-O,Transistor Q54 220204 or 2SC3423-Y,Transistor 220203 2SC3423-O,Transistor Q95 2202754 2SD266-P,Transistor Q952 2202764 2SB94-P,Transistor R602 400044 PTH9M04-2.2K,Thermistor T90 230487 NPT-396D,Power transformer U W204565-2D NAAF-6865-2D,Main PC board ass'y U2 W204566-2D NAAF-6866-2D,Input/Output PC board ass'y U3 W204567-2D NAAF-6867-2D,OP amplifier PC board ass'y U4 W204568-2D NAAF-6868-2D,Power supply PC board ass'y U5 W204569-2D NAAF-6869-2D,Power transformer PC board ass'y U7 W20457-2D NAAF-687-2D,Volume PC board ass'y U8 W204572-2D NAAF-6872-2D,PC board for holder U9 W204573-2D NAAF-6873-2D,Standby LED PC board ass'y B25 70-05-420-02 4 x 20,Self tapping screw
D933 Q95 G I O Q952 G I O D932 D93 R39 4.7K R32 4.7K C366-4.4V +4.4V +5.6V -B GND +B C93 C92 C9 D9 D_ARRAY T90 POWER TRANS AC IN AUTO_ STANDBY CANCEL SW R328 LEVEL Q303 Q302 (2/2) POWERAMP Q30 Q302 (/2) LPF 2DB/OCT 50-200HZ LPF 2DB/OCT 50-200HZ BAL AUTO_STANDBY ON/OFF CIRCUIT MUTE CIRCUIT THERMAL PROTECTION CIRCUIT CUTOFFFREQUENCY VOLUME RCAIN SPEAKER /OUTPUT NAETC-6867-2 NAETC-6870-2 +2dB NAAF-6866-2 5OHM SPEAKER NAAF-6865-2 NASW-6868-2 NAAF-6866-2 AC20V MDD NAPS-6869-2 -6dB +9.5dB +28dB -9dB SKW-50 BLOCK DIAGRAM
SCHEMATIC DIAGRAM U2 Input/Output PC board U3 OP amplifer PC board U Main PC board U7 Volume PC board U9 Standby LED PC board 5.5 5.6 0 0-0.6 0 5.0 4.9 5.4 0 5.6 5.4 0.4 0.4 0 0-37.6-5.0-4.4 4.4 37.6 5.0 P30 JL953A JL953B S30 P302 R306 2K R302 00K R304 00K R34 2.2K R32 4.7K R308 00 R30 00 R32 4.7K R36 0K R320 0K R37 5.6K R35 5.6K R303 00K R30 00K R33 2.2K R3 4.7K R309 00 R307 00 P304A P304B JL64B JL64A Q604 DTA24ES Q62 DTC24ES P604 P623 D95 MTZJ5C D952 MTZJ5C D622 D62 MTZJ2.7B Q507 2SA949-Y Q505 2SA949-Y Q509 2SA949-Y Q952 2SB94 Q605 2SA933S-S Q603 2SA933S Q606 2SA933S-S Q506 2SC2229-Y Q50 2SC2229-Y Q503 2SC2240 Q504 2SC2240 Q502 2SC775 Q50 2SC775 Q95 2SD266 Q622 2SC740S-S Q 2SC7 P50 D65 SS33 D633 SS33 D627 D628 R328 (2/2) R328 20KA (/2) JL303B JL303A Q303 M528 5 6 7 Q302 M528 3 2 Q30 M528 3 2 Q624 M528 3 2 Q624 M528 5 8 6 4 7 Q303 M528 3 8 2 4 Q30 M528 5 8 6 4 7 Q302 M528 5 8 6 4 7 C339 0. C340 0. C502 5 C505 020 C503 5 C366 223Z C38 02K C36 02K C35 02K C37 02K C630 04 C306 0 C527 47/50 C322 47/6 C50 220/6.3 C504 470/6.3 C62 0/50 C952 220/6 C95 220/6 C954 220/6 C953 220/6 C302 47/6 C30 47/6 C320 47/6 C305 47/6 C956 220/6 C955 220/6 C623 220/6 C622 0/50 R65 2K (/2W) R355 2.2K R349 47K R346 470 R305 2K R33 0K R329 47K R330 K R336 0 R508 47 (/4W) R5 82 (/4W) R52 82 (/4W) R ( R56 2K R55 2K R502 33K R50 22K R505 K (/4W) R506 K (/4W) R507 33K R527 K R509 330 R504 270 R503 5.6K R522 220 R52 220 R50 K R37 K R372 8.2K R62 5.6K R622 00K R952 47(/4W) R954 6.8K(/2W) R953 6.8K(/2W) R95 47 (/4W) R60 K R323 22K R6 00K R639 00K R60 00 R60 2.2M R607 0K R633 20K R63 39K R630 820K R63 22K R632 470K R629 390K R638 K R627 22 R38 8K R326 00K R39 4.7K R324 0 R327 00K R322 22K R62 22K R636 39K R626 0K R628 22 R625 0K R623 80 R624 50K NAAF-6865-2 NAETC-6870-2 NAAF-6866-2 LEVEL LEVEL SP /OUTPUT -37.9V 37.9V 37.9V -38.4V -37.8V LCH RCH CANCELSW POWER AUTO
0 SKW-50 SCHEMATIC DIAGRAM 20KB R356 (/2) P305B P305A CROSSOVER 20KB R356 (2/2) U7 Volume PC board NAAF-6867-2 NOTE THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR SAFETY. REPLACE ONLY WITH PART WITH PART NUMBER SPECIFIED. VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE. (NO SIGNAL) ELECTROLYTIC CAPACITORS ( ) ARE IN uf/wv. ALL CAPACITORS ARE IN pf/50wv UNLESS OTHERWISE NOTED. EX) 030 3pF 330 33pF 33 330pF 333 0.033uF THE THICK LINES ON PC BOARD ARE THE PRINTING SIDE OF THE PARTS. EX) PRINTING SIDE CIRCUIT IS SUBJECT TO CHANGE FOR IMPRIVEMENT. R349 47K R355 2.2K R357 5.6K C34 24 C343 24 3 2 8 Q305 4 M528 C344 47/6 R359 00K 2.2K R360 R358 R366 5.6K C345 24 C347 24 5 6 7 Q305 M528 R367 K A A CAUTION FOR CONTINUED PROTECTION AGAINST FIRE HAZARD. REPLACE ONLY WITH FUSE OF SAME TYPE V AND RATING INDICATED. ATTENTION AFIN D' ASSURER UNE PROTECTION PERMANENTE CONTRE LES RISQUES D'INCENOIE. REPLACER UNIOUEMENT V PAR UN FUSIBLE DE MEME TYPE ET CALIBRATION COMME INDIQUE. P50A U3 OP amplifer PC board R5 82 (/4W) Q509 2SA949-Y R53 82 (/4W).6V U Main PC board Q57 Q53 Q505 SA949-Y R54 820 R57 3.3K - Q54 2SC3423 2SA933S-S C57 0/50 Q58 2SD667A-C 2SC4793 R528 R526 330 50 (/2W) (/2W) Q55 R53 0.22 (5W) 2SC598 or 2SC4468 R534 00 P53 P535A R55 2K Q507 SA949-Y R56 2K 2SC2229-Y -37.9V Q50 R542 50 00B R544 R543 00 -.6 C528 0/50 Q59 C526 0/50 Q54 2SA837 R532 0.22 (5W) Q56 2SA94 or 2SA695 R533 3.3 (W) C59 224 Q506 2SC2229-Y R52 82 (/4W) R54 82 (/4W) -39.0V C54 0 2SB647A-C C520 224 Q604 DTA24ES 5.6 R608 00K P604 Q603 2SA933S 0 5 R609 00K 5.0 Q602 5.5 2SC740S-S R606 2.2M 0. 0.6 R604 680K C60 33/35 D60 SS33 R603 330K R60 22K R93 D933 820 MTZJ5.6B 7.V (W) D93 R934 D932 K (/2W) R932 5.6 820(W) D9 RS403L 39.0V C903 04J U4 Power switch PC board A 933S-S R607 0K R605 80K 0 R933 0K C93 0/50 C9 4700/50 T90 P902A P902B S90 C90 03M NAETC-6873-2 Q60 R602 2SC740S-S PTH9M04BC222 E80-39.0V C92 4700/50 C904 04J JL9A JL9B NPT-396D(MDD) NPT-396J(MJJ) F902A/25V (MJJ)(MDD) AC-H C902 472M P90 P902C NASW-6868-2 JL64A JL64B D64 SML-26W NAPS-6869-2 AC-G P90A MDD TYPE 20V/60HZ U9 Standby LED PC board U5 Power transformer PC board
PARTS LIST PC BOARD MAIN PC BOARD(NAAF-6865-2D) CIRCUIT NO. PART NO. DESCRIPTION IC Q624 22240369 M528AP Transistors Q50,Q502 220755 or 2SC775A-E or 220756 or 2SC775A-F or 2255 or 2SC775-E or 2256 2SC775-F Q503,Q504 22406 2SC2240-BL Q505,Q507 22354 2SA949-Y Q506,Q50 22634 2SC2229-Y Q509 22354 2SA949-Y Q53 2202800 2SC4793 Q54 2202790 2SA837 Q57,Q603 223354 or 2SA933S-R or 223355 or 2SA933S-S or 225995 KTA267-GR Q58 22563 2SD667A-C Q59 22573 2SB647A-C Q60,Q602 223284 or 2SC740S-R or 223285 or 2SC740S-S or 225864 KTC399-GR Q604 225780 or KRA03M or 222600 or DTA24ES or 223580 RN2203 Q605,Q606 223354 or 2SA933S-R or 223355 or 2SA933S-S or 225995 KTA267-GR Q62 22580 or KRC03M or 22360 or DTC24ES or 224220 RN203 Q622 223285 or 2SC740S-S or 223284 or 2SC740S-R or 225864 KTC399-GR Diodes D60,D65 22363 or SS33 or 223205 SS270A D627,D628 22363 or SS33 or 223205 SS270A D633 22363 or SS33 or 223205 SS270A D9 2238002 RS403L D93,D932 22363 or SS33 or 223205 SS270A D62,D622 224470272 MTZJ2.7B D933 224470562 MTZJ5.6B D95,D952 22447503 MTZJ5C
PARTS LIST PC BOARD MAIN PC BOARD(NAAF-6865-2D) CIRCUIT NO. PART NO. DESCRIPTION IC Q624 22240369 M528AP Transistors Q50,Q502 220755 or 2SC775A-E or 220756 or 2SC775A-F or 2255 or 2SC775-E or 2256 2SC775-F Q503,Q504 22406 2SC2240-BL Q505,Q507 22354 2SA949-Y Q506,Q50 22634 2SC2229-Y Q509 22354 2SA949-Y Q53 2202800 2SC4793 Q54 2202790 2SA837 Q57,Q603 223354 or 2SA933S-R or 223355 or 2SA933S-S or 225995 KTA267-GR Q58 22563 2SD667A-C Q59 22573 2SB647A-C Q60,Q602 223284 or 2SC740S-R or 223285 or 2SC740S-S or 225864 KTC399-GR Q604 225780 or KRA03M or 222600 or DTA24ES or 223580 RN2203 Q605,Q606 223354 or 2SA933S-R or 223355 or 2SA933S-S or 225995 KTA267-GR Q62 22580 or KRC03M or 22360 or DTC24ES or 224220 RN203 Q622 223285 or 2SC740S-S or 223284 or 2SC740S-R or 225864 KTC399-GR Diodes D60,D65 22363 or SS33 or 223205 SS270A D627,D628 22363 or SS33 or 223205 SS270A D633 22363 or SS33 or 223205 SS270A D9 2238002 RS403L D93,D932 22363 or SS33 or 223205 SS270A D62,D622 224470272 MTZJ2.7B D933 224470562 MTZJ5.6B D95,D952 22447503 MTZJ5C
PARTS LIST PC BOARD 2 MAIN PC BOARD(NAAF-6865-2D) CIRCUIT NO. PART NO. DESCRIPTION Capacitors C50 35472229 220uF,6.3V,Elect C504 35472479 470uF,6.3V,Elect C57,C526 35478009 0uF,50V,Elect C527 354784709 47uF,50V,Elect C528,C62 35478009 0uF,50V,Elect C60 354763309 33uF,35V,Elect C622,C93 35478009 0uF,50V,Elect C92 3504349 4700uF,50V,Elect C923 35474229 220uF,6V,Elect C95-C954 35474229 220uF,6V,Elect C502,C503 3747255 50pF+/-0%,50V,Plastic C59,C520 374722244 0.22uF+/-5%,50V,Plastic C630 37472044 0.uF+/-5%,50V,Plastic C903,C904 37473044 0.uF+/-5%,00V,Plastic Resistors R533 453630334 RNUWCJ-3.3 R53,R532 450008 BPR58FK-0.22 R526 4435254 RS/2WBJ-50 R528 44352334 RS/2WBJ-330 R65 44352234 RS/2WBJ-2K R934 44352024 RS/2WBJ-K R953,R954 443526824 RS/2WBJ-6.8K R93,R932 44362824 RSWBJ-820 R544 520359 N06HR00BC Clamp E82 260224 CP-S Sockets JL64 2009990604UL NSAS-6P088 P50 2009990602UL NSAS-4P085 Plugs JL64A 2505533 NPLG-3P7 P53,P604 25055038 NPLG-2P29 P535A 2505565 NPLG-2P49 P623 25055038 NPLG-2P29 JL953A 25055627 NPLG-6P589 Holders E83 2790608- (CRAMP) UA-0 V0 JL9A 250507 NSCT-3P894
PARTS LIST PC BOARD 3 /OUTPUT PC BOARD(NAAF-6866-2D) CIRCUIT NO. PART NO. DESCRIPTION ICs C30,C302 22240369 M528AP Capacitors C30,C302 354744709 47uF,6V,Elect C305,C320 354744709 47uF,6V,Elect C955,C956 35474229 220uF,6V,Elect Jack P30 25045549 NPJ-2PDBL370 Slide switch S30 25065286 NSS-222 Terminal P302 25060288 NTM-8PDML29 Holders JL303A 2505089 NSCT-5P876 JL953B 2505090 NSCT-6P877 OP AMPLIFIER PC BOARD(NAAF-6867-2D) ICs Q303,Q305 22240369 M528AP Capacitors C322,C344 354744709 47uF,6V,Elect C339,C340 37472044 0.pF+/-5%,50V,Plastic C34,C343 37472244 0.2pF+/-5%,50V,Plastic C345,C347 37472244 0.2pF+/-5%,50V,Plastic Sockets P304 2009990672UL NSAS-6P0935 P305 200999060UL NSAS-2P084 Plags P304A 25055234 NPLG-3P28 P305A 25055237 NPLG-6P22 P50A 25055233 NPLG-2P27 Wire trap JL303B 25055626 NPLG-5P588 POWER SWITCH PC BOARD(NASW-6868-2D) Push switch S90 25035550 NPS--L52P Capacitor C9 3504349 4700uF,50V,Elect
PARTS LIST PC BOARD 4 POWER TRANSFORMER PC BOARD(NAPS-6869-2D) CIRCUIT NO. PART NO. DESCRIPTION Capacitor C902 3300054 DE30E472M-KH Sockets JL9B 25050280 NSCT-3P08 P902 2009990603UL NSAS-2P087 Terminal P90A 25060092 NTM-S33 Plug P902A 25055676 NPLG-2P632 Fuse holders F90A,F90B 2505233 NSCT-P203 Cover C902A 273026 SB925A VOLUME CIRCUIT BOARD(NAETC-6870-2D) CIRCUIT NO. PART NO. DESCRIPTION Resistors R328 532475 N4RGL20KA25Z R356 532476 N4RGL20KB25Z STANDBY CIRCUIT BOARD(NAETC-6873-2D) CIRCUIT NO. PART NO. DESCRIPTION LED D64 225295 SML26W
ADJUSTMENT PROCEDURES Confirming operations Confirming operation of auto standby On/Off a. Turn AUTO STANDBY switch on. b. After no input condition continues more than 0 seconds, short-circuited the terminal of P604. Confirm that the indicator changes from red to green. c. Next short-circuited the terminal of P604. Confirm that indicator changes from green to red. Adjustment of idling current a. Adjust the trimming resistor R544 so that the voltage of P53 becomes 0.25mV. (Auto Standby Switch is OFF position. No input and no load. b. After 5 minuters, read just R544 so that the voltage becomes 4mV. P53 R544 P623 P604
FROM AMP/RECEIVER OUTPUT TO SPEAKERS LINE L (MONO) R AUTO STANDBY SKW-50 PACKING VIEW B33 The setting position before shimpment ( FRONT PANEL ) OUTPUT LEVEL CROSSOVER FREQUENCY POWER SW ( REAR PANEL ) AUTO STANDBY SWITCH ----- RIGHT ABOVE ----- RIGHT ABOVE ----- OFF ----- ON B3 B32 B43 B45 B36 B39 The set is put for side. SPEAKER LEVEL OFF ON B40 B37 CAISSON DE BASSES AMPLIFIE SKW-50 POWERD SUBWOOFER SYSTEM SKW-50 B44 B34 B35
PARTS LIST PACKING VIEW REF NO. PART NO. DESCRIPTION B3 62-000-394-0 MONO BLACK 3m,RCA Pin cord B32 65-000-204-0 Foot B33 80-000-470-0 Cushion B34 80-000-470- Cushion B35 84-00-923-0 Carton box B36 85-000-400-500x550x0.5t,Protection sheet B37 85-000-354-2 Protection sheet B39 2900097-A 250x350,Poly bag B40 29365090 Warranty card B43 87-000-996-0 Instruction manual B44 89-000-482-0 Label B45 85-000-376-6 700 x 950,Poly bag
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