SERVICE MANUAL - Audio Lab of Ga
Contents
1. R18 10K R19 10K RI R12 Ji i LEVEL Ty C7 0027 par R15 20 0K lr J Ride SD SE DN FRONT 2 n z PANEL 6 IN d 3 15K i RU 2 S ge F a des ci ce R4 c R9 47K a 14 Ju luF 5 Y A ui i R5 T 47 50 0 1 SCH GAIN 1 300K R16 R17 PHASE ADJUST DUT MC4741 R13 N OA 5 23K 11 22K EE 15v GAIN 3 100Hz NZ Les EG GAIN S 40Hz 001 100 L SUMMING BUFFER ON FRONT GAIN 6 GAIN 1 PANEL REF ONLY C3 SE A R21 6 65K L 150 100 c14 1uF BLK gt R IN Yon Cu eur A M R6 MC1458 f13v EN AK R22 301K 3 R137 R28 R29 R138 yon gt R BLK be 15K 220K 220K 15K RIER ey A Be A 2 2 U4 R7 C53 2 47 047 4 gt MC1458 RED HE RY w B R Wa 4 L BLK 44 T H5v L s BLK R8 LOW PASS P 4 7K GAIN 0 8 100Hz K za R cain GAIN 1 40Hz Y VARIABLE LOW PASS RED SK SOK GAIN 1 100Hz LP 120 R C4 GAIN 5 40Hz LP 40 BLK SN ER de G 190 100 LOW PASS DN FRONT PANEL 15v R38 lt R39 FA 15v US 43K 180K ges R132 NE570 2 27 a 2 2M 13 028 9 U6 15 16 S i gt 15v R42 8 100 14 Aeg a R30 2 or 2 u d cig 1 1 10K lt lt u R43 Sp fi do 10 25 ay 10K a sh US NE570 cw 2 gar l a TO PA 8 4 AME A 6 SHT 2 R33 19 gt 2 gt 1 100 10 25 U2 MC1452. R10 R45 R7 R4 R5 C1 C2 C10 C27 C30 C11 C15 C53 C16 C17 C19 C20 C5 C29 C3 C4 C32 C33 C34 C35 Page 12 KSAMM 002a SW15 1 PARTS LIST VALUE PART NUMBER 10K VARIABLE 50K VARIABLE DUAL 100K VARIABLE 15K 47K 22K 2 2 Meg 39K 6 65K 20K 10K 5 23K 2K 30 1K 220K 10K VARIABLE 100K 1000 43K 2 180K 2 10K 2 4 7K 4 3K 3WATT 0o 33 2K 1K 1 1K 3000 11 5K 2200 5100 2WATT 5110 22 10 39 2K 2 7K 3WATT 120K 1MQ 470 300K 22uF UF 12u F 047uF 1uF 25V Electrolytic O1uF 001uF 2 2uF 150uF 100V NON POLAR 470uF 50V Electrolytic 22pF KLIPSCH PART Klipsch Subwoofer Amplifier Service Manual KSAMM 002a SW15 I PARTS LIST continued PART C36 C37 C39 C40 C6 C55 R100 R101 R102 R103 R110 R111 R112 R113 R114 R115 R116 R121 R126 R130 R117 R119 R118 R120 R122 R123 R125 R131 R135 R136 R76 R77 R82 R83 R84 R87 R88 R89 R90 R91 R92 R93 R94 R95 R98 R99 R104 R105 R108 R109 C21 C22 C23 C24 C28 C31 C43 C44 C45 C46 C47 C48 C49 C50 C52 Page 13 VALUE PART NUMBER 330pF 4 7uF 25V Electrolytic 10uF 63V Electrolytic 10uF 25V Electrolytic 0027uF 1uF 1N914B 1N4752A Zener MC4741 MC1458N NE570 LM393 MPS8099 2N3906 MPS8599 MPSW56 MPSWO6 2SA1306B 2SC3298B KLIPSCH PART 118744 118743 118745 118742 118735 118728 118736 118738 118737 11
3. T M AUS A E R gt LEV vev ND CURR SENSE SHT 2 Q21 MJF15031 T 7 Bus R113 R90 ges f ape 47 750 R92 oe 2541302 Y 2881302 SV SW 2 V 7 R109 n pr 1 2 C46 L c47 206 vev NS vay D 4700 100 T 4700 100 R77 750 Q24 15 SW N MJF P I 1W 8lv FIL DVR BD ON FRONT PANEL e al R127 Fi 10K Dig Len N iNS14B LED Mo TO D T LDET SHT 2 1 ENE ber vel AC POWER de AVRECT ST 2 MOUNTED TO BEAR PANEL uF 125VAC RED BLK To ee So VE PRE PER a A gt 4 LIN our F 15v L cat L ces DE T 1000 35 T 1725 THI XFMR CT IT 15V SUPP a D3 L L L POWER BD tL cee U9 1 tL c24 D4 Ge T 1000735 2 GND 3 1785 F1 B e IN OUT 4 15v 1N4002 4 SW15 I Sheet 3
4. the woofer The LINE LEVEL inputs also use a high pass filter that allows freguencies above 80 Hz to go back out to a system amplifier Freguencies below 80 Hz go through the subwoofer amplifier and on to the woofer Both filters have a 6dB per octave rolloff SIGNAL CONDITIONING The first op amp of U1 a guad op amp IC is a summing amp for the RCA and SPEAKER level inputs The LEVEL adjustment is located between the first and second op amp stages of U1 The second op amp of U1 is a buffer stage with a gain of 1 The third op amp of U1 is a High pass filter configuration The fourth op amp of U1 is used to adjust phase from 0 to 180 The next circuit is an adjustable RC filter for low pass filtering from 40Hz to 120Hz consisting of U2 and U4 COMPRESSION The compression circuit consists of U5 U6 and O28 and is adjusted via R30 If adjusted correctly this circuit will limit the amplitude of the signal so the minimum amount of distortion in the form of clipping will occur at the output of the amplifier R34 is used to set the maximum output level for the amplifier so it doesn t underamplify or clip Next the signal goes through a buffer amplifier U2 which provides a gain of 4 Then the signal goes on to the driver circuits DRIVER CIRCUIT The driver circuit consists of Q1 through Q12 and is located on the Filter Driver board The driver circuit has a DC offset adjustment R50 which should be set at 0 Vdc 50mVdc This can be measu
5. 100K VARIABLE 15K 47K 22K 2 2 Meg 39K 6 65K 20K 10K 5 23K 2K 30 1K 220K 10K VARIABLE 100K 100Q 43K 2 180K 2 10K 2 4 7K 4 3K 3WATT 0o 33 2K 1K 1 1K 3000 11 5K 2200 5100 2WATT 5110 22 10 39 2K 2 7K 3WATT 91K 1MQ 470 300K 22uF UF 12u F 047uF 1uF 25V Electrolytic O1uF 001uF 2 2uF 150uF 100V NON POLAR 470uF 50V Electrolytic 22pF KLIPSCH PART Klipsch Subwoofer Amplifier Service Manual KSAMM 002a SW12 I PARTS LIST continued PART C36 C37 C39 C40 C6 C55 R100 R101 R102 R103 R110 R111 R112 R113 R114 R115 R116 R121 R126 R130 R117 R119 R118 R120 R122 R123 R125 R131 R135 R136 R76 R77 R82 R83 R84 R87 R88 R89 R90 R91 R92 R93 R94 R95 R98 R99 R104 R105 R108 R109 C21 C22 C23 C24 C28 C31 C43 C44 C45 C46 C47 C48 C49 C50 C52 Page 10 VALUE PART NUMBER 330pF 4 7uF 25V Electrolytic 10uF 63V Electrolytic 10uF 25V Electrolytic 0027uF 1uF 1N914B 1N4752A Zener MC4741 MC1458N NE570 LM393 MPS8099 2N3906 MPS8599 MPSW56 MPSWO6 2SA1306B 2SC3298B KLIPSCH PART 118744 118743 118745 118742 118735 118728 118736 118738 118737 118730 118732 470 5WATT 4 70 3WATT 10 3WATT 10K 56K 22K 3900 1WATT 100K 68Q 10K Variable 1 8K 6 8K 15Q 1WATT 1509 1009 1000 Variable 1 5K DWATT 51Q 22 10 1 20 1 2WATT 1000uF 35V Electrolytic 1
6. 15 For the THX amp apply a 3Vrms 70Hz signal to one RCA jack The voltage across the load should be between 35 1 Vrms and 36 Vrms If this is correct connect an oscilloscope to the output signal and look for clipping If the voltage was too high re align amplifier per procedure on page 5 6 or 7 If the signal was clipped re adjust the amplifier per alignment procedure on page 5 6 or 7 4 Excessive hum 1 Check all ground connections 2 Check all filter capacitors C21 C22 C23 C24 C44 C45 C46 and C47 5 Amplifier quits working after a short 1 Check for excessive heat on heat sink This indicates a period of time a bad output device or a bad thermal switch 2 Check output relay RLY1 3 Check U11 and U12 Page 8 Klipsch Subwoofer Amplifier Service Manual PART LEVEL CONTROL LOWPASS ADJUST PHASE ADJUST R1 R2 R3 R128 R137 R138 R12 R11 R13 R35 R36 R133 R134 R132 R139 R14 R21 R15 R16 R18 R19 R40 R41 R127 R17 R20 R22 R28 R29 R30 R34 R50 R31 R32 R37 R33 R42 R68 R71 R38 R39 R43 R44 R6 R8 R46 R47 R53 R9 R49 R51 R67 R54 R62 R55 R63 R56 R61 R57 R58 R59 R60 R6 R8 R64 R69 R65 R70 R73 R75 R66 R72 R74 R10 R45 R7 R4 R5 C1 C2 C10 C27 C30 C11 C15 C53 C16 C17 C19 C20 C5 C29 C3 C4 C32 C33 C34 C35 Page 9 KSAMM 002a SW12 l PARTS LIST VALUE PART NUMBER 10K VARIABLE 50K VARIABLE DUAL
7. 2 2M f Q28 U6 15 gt 16 ER a 15v e 8 14 3 AG C16 Ta 1 25 1 25 U6 AJ R30 ge 12 10 ER qe 10K lt lt i R43 SR44 4 Meer R31 IR 10K a 5 US NES70 cg ll 100K 2 g i TO PA 4 2 R33 Ca Se D ee 2 gt 1 100 10 25 Ue ease A SKRE WA HE R34 R35 Lt R37 BUFFER y NO COMPRESSION ee 1 2 gt L a Gs 100K ER EIS 5 Zi GAIN c20 DE 6 Be SW15 I sheet 1 SHT 3 SHT 3 N gt R55 300 R54 R64 R65 R75 LIK 511 221 221 C36 R47 330p Ge 4 3K 09 c28 FN MeSWS6 Ne E Qu 2SA1306B 470 100 34 N Qs 28A1306B N c27 Gy MPS8099 DRIVER CKT T Jup Pr J gt FILTER DRIVER BD y 34 4 RS6 R68 R74 c32 EN 034 11 5K a2 R46 Sea 100 2 7K ces 4 7K 170799 DS 22pf MPS8099 SC PA m 1N4752A W IQ R66 5 GE A anm R57 R58 39 2K po te FROM SHT 1 2 2uF 220 220 l p K R45 15v A A A MPS8099 ji d a 1M JL MPS8599 t GND R133 gt 93 c40 z 22K R49 e EN c35 Ny A R139 css 330pF al 33 2K 44970 ne 22pF Q4 39K 10 63 R71 R72 Cw R50 1N4752A MPS8599 100 2 7K Ca c30 3W 470 100 AUF 34v Q12 Lou F SAN MPSBS99 M gt R51 ee 08 pt 1K LO e 2SC3298B PN on 22K R53 L 2SC3298B os lt lt Va 4 3K E MPSW06 15v 3W C37 R62 Bs LIK 330pF2 R69 R70 R73 511 221 22 1 R63 300 P pi RLY1 SPKR E
8. 2 GND T ves FI LB e IN OUT 4 15v 1N4002 4 7915 R14 6 65K RIS 10K RIS 10K RI LEVEL R12 15K C7 9027 47K Fa R128 R10 120K Soe Z C10 Ze IN ISK PANEL RU dur u 7 4 B 13 c8 R4 R9 7 IW 300K ce SCH ut f 4 y 12 SCH GAIN 1 L RS 47 50 0 nis Ge om 300K Pla A PHASE ADJUST AM T SS HIGH PASS Lisv GAIN 3 100Hz NZ CS LG GAIN 5 40Hz 001 100 Y SUMMING BUFFER ON FRONT GAIN 8 GAIN 1 PANEL LA REF ONLY c3 R21 6 65K gt Ba SC L C14 Jup BLK R IN e ZUR A f i M ay MC1458 HSV 47K R22 301K 3 R137 R28 R29 R138 a R BLK AE 15K 220K 220K 15K 3 i BLK ve DH 7 i 4 2 E U4 R7 c53 47 047 Se 4 sy CIS 7 MC1458 EE W B R 047 4 L BLK DV St Liz y s BLK R8 LOW PASS 3 4 7K GAIN 0 8 100Hz K ped R L IN GAINSL 84012 y VARIABLE LOW PASS RED Ae SOK GAIN 1 100Hz LP 120 R ca GAIN 5 40Hz LP 40 BLK L DUT It G 150 100 LOW PASS ON FRONT PANEL 15v ve R38 lt R39 Ko 15 43K 180K R132 E NES70 2 SZ n HM393
9. 237 d c52 tL c49 tL cso 1N914B 4 T 330 16 T 33 50 T 47 50 CURRENT SENSE TO POWER AMP POWER BD SHEET 3 SW12 Sheet 2 R76 N 15 ji 8lv 1W SW 2SC3281 16 L c44 tl cas 2503281 4700 100 T 4700 100 51 R100 Ze R110 ais SC POWER AMP POWER BD LJ t S19 150 EE 2SC3281 AAC gt XFMR CT R101 RIT Ly R93 A1 2uH ge F gt Hann 100 10 221 SW FROM DRIVER CKT REGN OUT TD RLYI SHT 2 FILTER DRIVER BD K B s 1 SHEET 2 ei R114 100 R102 A LGND A7 AS Sw 3W eg IG SPKR RET R83 227 gee C48 100 MPSA06 gog 2541302 we TG 12 E LM vew VM R gt CURR SENSE SHT 2 Kj r T MJF15031 R103 R113 A7 Q25 R92 aSA1302 5Y 51 R99 NA ar p L c46 1047 vew Ns MAN 4700 100 T 4700 100 R77 24 15 S MJF P I l 1W 81v FIL DVR BD ON FRONT PANEL F 7 R127 10K LED Yo T LDET SHT 2 Ge Bees ke Es AC POWER C56 VRECT SHT 2 MOUNTED TO REAR PANEL ur 125VAC RED BLK i Mu IL to 11 1 A gt IN OUT 15v L GND al ca3 GE De 2 7815 1725 THI XFMR CT T 15V SUPP ae o L L POWER BD U9 1 tL ce4 D
10. 8 d GAIN 1 ERA wl R34 Ras R37 BILEN 5 AE END COMPRESSION dak a ae yo NA 100K T el 5 Fie GAIN c20 0luF Ka gt 6 SHT 3 SHT 3 RSS 300 R54 R64 R65 R75 LIK su 221 22 1 C36 R47 330p 4 3K 05 Q9 ces eV au PN meswse an cg FN 28013068 470 100 c27 MPS8099 SS DRIVER CK T ur P WA FILTER DRIVER BD A NEE R68 R74 L cae 034 ge 100 2 7K c29 he Tr 470 50 DS 22pF MPS8099 av PA 1N4752A LE S R66 cae PA 39 2K T 330pF FROM SHT 1 2 2UF L K R45 15v MRS3029 L IM BS MPS8599 T GND So Se T S30pr R49 Ze K c35 R139 CSS B ala 33 2K 470 50 D6 22pF 39K 10 63 R71 R72 Cw R50 1N4752A MPS8599 100 Sak lt ca co 10K 470 100 dur 34v ate MD Se SAN MPs8599 R134 Rol ad BK 1K W ANescseseB aL per Na Va ND ESCSER8E ES MPSWO6 v 3W 037 R62 LIK 330pF R69 R70 R73 511 221 22 1 R63 300 4 PD RLY1 SPKR e Q gt Uu 15 R135 LI py R122 R131 R120 100K 1 8K 10K VRECT Si 390 1W 2 OFFSET A a iN4002 ge Ba a RELAY CKT paia D15 aj MC1458 R116 LDET S k 7 POWER BD 10K gt gt XFMR SENSE ule R136 D17 Ries SAT 3 1N4002 5 SR us gt gt 1 GND pipi 6 8K 1N914 an RELAY A 4 Eg R119 7 bia Tue Leo 1 15 DELAY R123 RI 100K 8 R117 SUPPLY L CSA 56K 15 10 25 UPC1
11. 8730 118732 470 5WATT 4 70 3WATT 10 3WATT 10K 56K 22K 3900 1WATT 100K 68Q 10K Variable 1 8K 6 8K 15Q 1WATT 1500 1000 1000 Variable 1 5K 5WATT 51Q 22 10 1 20 1 2WATT 1000uF 35V Electrolytic 1uF 25V Electrolytic 470uF 100V Electrolytic 100uF 10V Electrolytic 4700uF 100V Electrolytic UF 33uF 50V Electrolytic 4 7uF 50V Electrolytic 330uF 16V Electrolytic Klipsch Subwoofer Amplifier Service Manual KSAMM 002a SW15 I PARTS LIST continued PART C54 C56 D1 D2 D3 D4 D11 D12 D13 D14 D15 D16 D17 Q15 Q18 Q16 Q17 Q19 Q20 Q21 Q24 Q22 Q23 Q25 Q26 Q27 U11 RCA PANEL SPEAKER INPUT JACKS TRANSFORMER SW2 Power F1 TH1 Thermal protection BR1 DUAL VOLTAGE TRANSFORMER DUAL VOLTAGE SWITCH 115 to 230 CAPACITOR DUAL VOLTAGE MODEL Page 14 VALUE PART NUMBER 10uF 25V Electrolytic UF 125Vac 1N4002 1N914 MJF15030 2SC3291 MJF15031 2SA1302 MPSA06 UPC1237 MC1458 7915 7915 2uH JUMPER AROMAT J51E 12 Relay PW 6582 5 Amp 250Vac Slow Blow ASAH US 602S GBPC 3502 PW 6661 047uF 300V KLIPSCH PART 118733 118731 118734 118729 118746 118743 118739 118740 118721 118348 118725 R14 6 65K
12. SERVICE MANUAL Subwoofer Amplifier Model SW12 I SW15 I KLIPSCH INC Klipsch Subwoofer Amplifier Service Manual KSAMM 002a SPECIFICATIONS esoreveevesnvevesnnserennvevennennnenesnnsvrenasevennssnnenennnserenasevenesenennennsevennnsevenesenennennsenesnnsevenesenesnesnnener 2 eelere 2 EE EE 2 THEORY OF OPERATION sssosevereveveenesnnevesnnsnnevesnnserenesevennnnnnenesnnsvesnnsevenesenennennsevesnnserenesnnsevenesevevessersnnner 3 IN PITS EE 3 SIGNAL CONDITIONI Nai isa te disan as AA KK sd aa de Aa KI stan dio pie mand pi SEN alabaz 3 COMPRESSION EE 3 DRIVER CIRCUIT 2 NEEN dei 3 OUTPUT 3 OTHER FEATURES keraitene 4 ALIGNMENT PROCEDURES eeooseverevensevevnsennenesnnsvesnnsevenesenennennnenesnnserenasevennssnnenennnsersnnsevennsenennennnevesnnserer 5 Models MEN areas 5 Model EE 6 TROUBLE SHOOTING GUIDE r ssvosevevevevesnesnnevesnnserenasevennennnenesnnsvrsnnsevenesenennennsevennnsevenasenennesnnenennssersneser 7 SW12 PARTS LIS RE 9 SW15 PARTS LIST nsonenoseveseveneenesnvsvnsnnsevenesenennennsevesnnsevennsenennennnenennnsvrenesevennssneenennnsvnsnnsevenesensenesnsevesnnsesener 12 SCHEMATICS iii 15 Model WILD dao Mable bot tat tial esate 15 Model SWISS ddyn go van en A sede Maske enen et de ado dok atak sen Ye A p s yok 18 Page 1 Klipsch Subwoofer Amplifier Service Manual KSAMM 002a Specifications Model SW12 I Input Sensitivity for max Rated Output Line input 60mVrms 30Hz Speaker input 700mVrms 30Hz Maximu
13. f the UUT is now complete Disconnect power and other connections from the UUT Page 5 Klipsch Subwoofer Amplifier Service Manual KSAMM 002a SW15 I AMPLIFIER ALIGNMENT PROCEDURE CAUTION Lethal voltages are present and exposed when cover is off of amplifier o Ww 7 Only qualified service technicians should attempt to repair or align subwoofer amplifiers Equipment required A signal source capable of supplying a 30Hz sine wave at 300mVrms A true RMS Voltmeter such as the Fluke 8060B A 16 ohm load rated for at least 300 Watts An oscilloscope optional To totally align SW15 series 1 amplifiers follow this procedure 1 Disconnect power from the UUT unit under test 2 Connect the UUT unit under test to a 16 ohm load 3 Connect a signal generator to the RCA input of the amp 4 Set all controls on the UUT to their full clockwise position 5 Set the signal generator for 30Hz and 33mVrms output be sure and measure the output of the generator for 33mVrms 6 Connect the voltmeter leads to the output of the UUT 7 Apply power to the UUT 8 Adjust R34 for 29 5Vrms Range is from 29 1Vrms to 30 1Vrms 9 Change signal level to 1 5mVrms 30Hz 10 Measure the output voltage Should be between 1 19 Vrms and 1 33Vrms Adjust R30 if necessary NOTE Some interaction between adjustments is common Recheck steps 8 and 10 for proper voltages 11 Alignment of the UUT is now complete Disconnect power and
14. gt e Q gt U11 15 R135 i R122 R131 R120 D L 100K 1 8K 10K VRECT e 390 1W 2 OFFSET A A A 415 1N4002 rl 3 Latch RELAY CKT 19 DIS 3 MC1458 R116 LDET Z k 4 POWER BD ki 10K Don XFMR SENSE ule R136 D17 SHT 3 R126 1N4002 5 SP us gt Z pro 7 DND 10K ab 6 8K 1N914 6 RELAY A e R119 D13 Di6 LRi30 10K 15 DELAY R123 100K 10K 56K 7 R117 SUPPLY tL c54 56K 15 T 10 25 UPC1237 R gt tL c52 tL c49 tL cso 1N914BC4 T 330 16 33 50 T 47 50 CURRENT SENSE de TO POWER AMP POWER BD SHEET 3 SW15 I Sheet 2 R76 7915 81 N AA Y 1W R87 Q15 750 NF 15030 Q17 SW R34 2SC3281 MYW es tt c44 L cas R89 Soi 2sc3281 4700 100 T 4700 100 Zon 51 R100 SW 47 R110 47 018 ar sw POWER AMP 7 WF 19030 R95 POWER BD Eg A 12 R105 172W S419 1 2W S20 R101 R111 L1 ES R93 47 A7 Euh F gt 100 10 323 Su sy FROM DRIVER CKT i DUT AD TO RLY1 SHT 2 gt FILTER DRIVER BD K R84 Y T Erie SHEET 2 Rue R114 GW a R102 47 10 L gt LGND Er Sw 47 av 3W LG SPKR RET Res ya gee Bee C48 Ee MPSS eg Sag 2108 2541302 dur
15. m Rated Output 150 Watts into 8 ohms Max Hum 3 5mV 60Hz Max Distortion 4 At Full Rated Output Freq Response 27 to 120Hz 0 3dB w 12dB per Octave Rolloff Bass Boost 6dB Boost 30Hz Low Pass Crossover Variable from 40 120 Hz 24 dB Octave slope above 120 Hz High Pass Crossover Line outputs fixed at 80 Hz 6dB Octave slope Speaker outputs fixed at 120 Hz 6dB Octave slope Model SW15 I Input Sensitivity for Max Rated Output Line input 33mVrms Q 30Hz Speaker input 900mVrms 30Hz Maximum Rated Output 200 Watts into A ohms Max Hum 3 5mV 60Hz Max Distortion 4 At Full Output Freq Response 27 to 120Hz 0 3dB w 12dB per Octave Rolloff Bass Boost 6dB Boost 30Hz Low Pass Crossover Variable from 40 120 Hz 24 dB Octave slope above 120 Hz High Pass Crossover Line outputs fixed at 80 Hz 6dB Octave slope Speaker outputs fixed at 120 Hz 6dB Octave slope Page 2 Klipsch Subwoofer Amplifier Service Manual KSAMM 002a THEORY OF OPERATION SW12 8 SW15 Series I Amplifiers INPUTS There are two types of inputs and passive outputs Four RCA jacks for LINE LEVEL left and right inputs and outputs and a panel of SPEAKER LEVEL inputs and outputs for left and right stereo channels The SPEAKER LEVEL inputs have a high pass filter on each channel that allows frequencies above 120 Hz to go directly to the main speakers of the system Frequencies below 120 Hz go through the subwoofer amplifier and on to
16. n the Filter Driver Board and consists of U11 U12 RLY 1 and R131 R131 is used to set the threshold level for over current sensing Page 4 Klipsch Subwoofer Amplifier Service Manual KSAMM 002a SW12 I AMPLIFIER ALIGNMENT PROCEDURE CAUTION Lethal voltages are present and exposed when cover is off of amplifier x Only qualified service technicians should attempt to repair or align subwoofer amplifiers Equipment required A signal source capable of supplying a 30Hz sine wave at 300mVrms A true RMS Voltmeter such as the Fluke 8060B A 16 ohm load rated for at least 200 Watts An oscilloscope optional To totally align SW12 series 1 amplifiers follow this procedure 1 Disconnect power from the UUT unit under test 2 Connect the UUT unit under test to a 16 ohm load 3 Connect a signal generator to the RCA input of the amp 4 Set all controls on the UUT to their full clockwise position 5 Set the signal generator for 30Hz and 60mVrms output be sure and measure the output of the generator for 60mVrms 6 Connect the voltmeter leads to the output of the UUT 7 Apply power to the UUT 8 Adjust R34 for 33Vrms Range is from 32 1 Vrms to 34 Vrms 9 Change signal level to 1 5mVrms 30Hz 10 Measure the output voltage Should be between 94 Vrms and 1 06Vrms Adjust R30 if necessary NOTE Some interaction between adjustments is common Recheck steps 8 and 10 for proper voltages 11 Alignment o
17. other connections from the UUT Page 6 Klipsch Subwoofer Amplifier Service Manual KSAMM 002a TROUBLE SHOOTING GUIDE CAUTION Lethal voltages are present and exposed when cover is off of amplifier x Only qualified service technicians should attempt to repair or align subwoofer amplifiers PROBLEM POSSIBLE CAUSE 1 Blows fuse with nothing connected Check output transistors on power board to the output Replace transistors that are shorted Check driver transistors on filter driver board Replace transistors that are shorted Check U7 and U9 for shorts Check bridge rectifier in power supply circuit Check transformer Check filter capacitors C21 C22 C23 C24 C44 C45 C46 and C47 Check for pinched wires going to and coming from the transformer 2 Low output level using speaker level Check inputs for correct polarity from source inputs If polarity is not correct the signals will be 180 out of phase and will cancel each other out causing a low output Check R79 and R80 Should read 91KQ Check U13 Check for proper signal flow using schematic Page 7 Klipsch Subwoofer Amplifier Service Manual KSAMM 002a TROUBLE SHOOTING GUIDE continued PROBLEM POSSIBLE CAUSE 3 Causing popping sound Connect amplifier output to a 16 ohm load Apply a 60mVrms 30Hz signal to one RCA jack The voltage across the load should be between 32 1 Vrms and 34 Vrms for SW12 29 1 Vrms and 30 Vrms for SW
18. red across the and output wires white amp black respectively from the amp with power on and no signal applied The driver circuit is a Class AB amplifier OUTPUT The output section of this amplifier uses discrete components Q15 through O26 to obtain the high power output reguired The output amplifier circuit is a Class AB complementary symmetry configuration with three sets of four transistors cascaded This provides high power output into a low impedance load The components for the output circuit is located on the Power Board POWER SUPPLIES The main power supply circuit is unregulated and supplies 81 Vdc for the output and driver circuits The 81 Vdc is then divided and regulated by 34V zener diodes to supply 34 Vdc to bias the driver circuit There is a second power supply which is fed by a second set of taps off of the transformer This is the regulated 15 Vdc for the op amps on the filter board Page 3 Klipsch Subwoofer Amplifier Service Manual KSAMM 002a OTHER FEATURES This amplifier uses a control circuit to control the operation of the output relay When power is first applied the circuit provides a delay before activating the relay This is a protection feature to protect the speaker and amplifier from initial current surges The circuit also provides protection from over current conditions by de activating the relay when excessive output current is sensed The relay and it s control circuitry is located o
19. uF 25V Electrolytic 470uF 100V Electrolytic 100uF 10V Electrolytic 4700uF 100V Electrolytic UF 33uF 50V Electrolytic 4 7uF 50V Electrolytic 330uF 16V Electrolytic Klipsch Subwoofer Amplifier Service Manual KSAMM 002a SW12 I PARTS LIST continued PART C54 C56 D1 D2 D3 D4 D11 D12 D13 D14 D15 D16 D17 Q15 Q18 Q16 Q17 Q19 Q20 Q21 Q24 Q22 Q23 Q25 Q26 Q27 U11 RCA PANEL SPEAKER INPUT JACKS TRANSFORMER SW2 Power F1 TH1 Thermal protection BR1 DUAL VOLTAGE TRANSFORMER DUAL VOLTAGE SWITCH 115 to 230 CAPACITOR DUAL VOLTAGE MODEL Page 11 VALUE PART NUMBER 10uF 25V Electrolytic UF 125Vac 1N4002 1N914 MJF15030 2803281 MJF15031 2SA1302 MPSA06 UPC1237 MC1458 7915 7915 2uH JUMPER AROMAT J51E 12 Relay PW 6582 5 Amp 250Vac Slow Blow ASAH US 602S GBPC 3502 PW 6661 047uF 300V KLIPSCH PART 118733 118731 118734 118729 118746 118743 118739 118740 118721 118348 118725 Klipsch Subwoofer Amplifier Service Manual PART LEVEL CONTROL LOWPASS ADJUST PHASE ADJUST R1 R2 R3 R128 R137 R138 R12 R11 R13 R35 R36 R133 R134 R132 R139 R14 R21 R15 R16 R18 R19 R40 R41 R127 R17 R20 R22 R28 R29 R30 R34 R50 R31 R32 R37 R33 R42 R68 R71 R38 R39 R43 R44 R6 R8 R46 R47 R53 R9 R49 R51 R67 R54 R62 R55 R63 R56 R61 R57 R58 R59 R60 R6 R8 R64 R69 R65 R70 R73 R75 R66 R72 R74
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