Klipsch-SW12I-pwr-sm 维修电路原理图.pdf

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1、SERVICE MANUALSubwoofer Amplifier Model: SW12-ISW15-IKLIPSCH, INC. RadioFans.CN 收音机爱 好者资料库Klipsch Subwoofer Amplifier Service ManualKSAMM-002aTABLE OF CONTENTSSPECIFICATIONS.2Model: SW12-I .2Model: SW15-I .2THEORY OF OPERATION.3INPUTS . 3SIGNAL CONDITIONING. 3COMPRESSION. 3DRIVER CIRCUIT . 3OUTPUT .

2、 3OTHER FEATURES. 4ALIGNMENT PROCEDURES .5Model: SW12-I . 5Model: SW15-I . 6TROUBLE SHOOTING GUIDE.7SW12 PARTS LIST.9SW15 PARTS LIST.12SCHEMATICS.15Model: SW12-I . 15Model: SW15-I . 18Page 1RadioFans.CN 收音机爱 好者资料库Klipsch Subwoofer Amplifier Service ManualKSAMM-002aSpecificationsModel: SW12-I Input S

3、ensitivity for max Rated Output: Line input 60mVrms 30Hz. Speaker input 700mVrms 30Hz.Maximum 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 Crossove

4、r: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-IInput Sensitivity for Max Rated Output: Line input 33mVrms 30Hz. Speaker input 900mVrms 30Hz.Maximum Rated

5、Output: 200 Watts into 4 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 8

6、0 Hz, 6dB/Octave slope. Speaker outputs fixed at 120 Hz, 6dB/Octave slope. Page 2Klipsch Subwoofer Amplifier Service ManualKSAMM-002aTHEORY OF OPERATIONSW12, & SW15 Series I AmplifiersINPUTSThere are two types of inputs and passive outputs. Four RCA jacks for LINE LEVEL left and right inputs and out

7、puts 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 amplifie

8、r and on to the woofer. The LINE LEVEL inputs also use a high pass filter that allows frequencies above 80 Hz to go back out to a system amplifier.Frequencies 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

9、 op-amp of U1, a quad 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

10、 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.COMPRESSIONThe compression circuit consists of U5, U6, and Q28 and is adjusted via R30. If adjusted correctly, this circuit will limit th

11、e 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 doesnt underamplify or clip. Next, the signal goes through a buffer amplifier U2, which provides a gain

12、 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 measured across the + and - output w

13、ires (white & black respectively) from the amp with power on and no signal applied. The driver circuit is a Class AB amplifier. OUTPUTThe output section of this amplifier uses discrete components Q15 through Q26 to obtain the high power output required. The output amplifier circuit is a Class AB com

14、plementary 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 o

15、utput 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 boar

16、d.Page 3Klipsch Subwoofer Amplifier Service ManualKSAMM-002aOTHER 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

17、 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 its control circuitry is located on the Filter/Driver Board and consists of U11, U12, RLY 1 and R131. R131 is us

18、ed to set the threshold level for over-current sensing. Page 4Klipsch Subwoofer Amplifier Service ManualKSAMM-002aSW12-I AMPLIFIER ALIGNMENT PROCEDURE CAUTION!Lethal voltages are present and exposed when cover is off of amplifier.? ?Only qualified service technicians should attempt to repair or alig

19、n 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. Di

20、sconnect 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 meas

21、ure 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 1.0

22、6Vrms. 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 other connections from the UUT. Page 5Klipsch Subwoofer Amplifier Service ManualKSAMM-002aSW15-I AMPLIFIE

23、R ALIGNMENT PROCEDURE CAUTION!Lethal voltages are present and exposed when cover is off of amplifier.? ?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 Voltmet

24、er 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 generat

25、or 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.

26、 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 volt

27、ages. 11. Alignment of the UUT is now complete. Disconnect power and other connections from the UUT. Page 6Klipsch Subwoofer Amplifier Service ManualKSAMM-002aTROUBLE SHOOTING GUIDE CAUTION!Lethal voltages are present and exposed when cover is off of amplifier.? ?Only qualified service technicians s

28、hould attempt to repair or align subwoofer amplifiers. PROBLEMPOSSIBLE CAUSE1 Blows fuse with nothing connected1 Check output transistors on power board. to the output.Replace transistors that are shorted. 2 Check driver transistors on filter/driver board.Replace transistors that are shorted. 3 Chec

29、k U7 and U9 for shorts.4 Check bridge rectifier in power supply circuit.5 Check transformer.6 Check filter capacitors. C21,C22, C23, C24, C44, C45, C46, and C47.7 Check for pinched wires going to and coming from the transformer.2 Low output level using speaker level1 Check inputs for correct polarit

30、y 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.2 Check R79 and R80.Should read 91K?.3 Check U13.4 Check for proper signal flow using schematic.Page 7Klipsch Subwoofer Amplifier Service ManualKSAMM-002aTROUBLE

31、SHOOTING GUIDE(continued)PROBLEMPOSSIBLE CAUSE3 Causing popping sound.1 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 SW15. For the THX amp., apply a 3Vrms

32、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 theoutput 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-adjus

33、t the amplifier peralignment 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 short1 Check for excessive heat on heat sink. This indicates a period of time.a bad outp

34、ut device or a bad thermal switch.2 Check output relay (RLY1).3 Check U11 and U12.Page 8Klipsch Subwoofer Amplifier Service ManualKSAMM-002aSW12-I PARTS LISTPARTVALUE/PART NUMBERKLIPSCH PART #LEVEL CONTROL 10K VARIABLELOWPASS ADJUST50K VARIABLE, DUALPHASE ADJUST100K VARIABLER1, R2, R3, R128, R137, R

35、13815KR12, R1147KR13, R35, R36, R133, R13422KR1322.2 MegR13939KR14, R216.65KR1520KR16, R18, R19, R40, R41, R12710KR175.23KR202KR2230.1KR28, R29220KR30, R34, R5010K VARIABLER31, R32, R37100KR33, R42, R68, R71100?R3843K 2%R39180K 2%R43, R4410K 2%R6, R8, R464.7KR47, R534.3K 3WATTR90?R4933.2KR51, R671KR

36、54, R621.1KR55, R63300?R56, R6111.5KR57, R58, R59, R60220?R6, R8510? 2WATTR64, R69511?R65, R70, R73, R7522.1?R6639.2KR72, R742.7K 3WATTR1091KR451M?R747?R4, R5 300KC1, C2.22FC10, C27, C30.1FC11.12FC15, C53.047FC16, C17, C191F 25V ElectrolyticC20.01FC5.001FC292.2FC3, C4 150F 100V NON-POLARC32, C33470F

37、 50V ElectrolyticC34, C3522pFPage 9Klipsch Subwoofer Amplifier Service ManualKSAMM-002aSW12-I PARTS LIST(continued)PARTVALUE/PART NUMBERKLIPSCH PART #C36, C37, C39, C40330pFC64.7F 25V ElectrolyticC5510F 63V ElectrolyticC1810F 25V ElectrolyticC7.0027FC8, C91FD181N914BD5, D61N4752A ZenerU1MC4741118744

38、U2, U4MC1458N118743U5NE570118745U6LM393118742Q1, Q2, Q11MPS8099118735Q282N3906118728Q3, Q4, Q12MPS8599118736Q5MPSW56118738Q6MPSW06118737Q7, Q92SA1306B118730Q8, Q102SC3298B118732R100, R101, R102, R103, R110, R111, R112, R113.47? 5WATTR1144.7? 3WATTR1151? 3WATTR116, R121, R126, R13010KR117, R11956KR11

39、822KR120390? 1WATTR122, R123100KR12568?R13110K VariableR1351.8KR1366.8KR76, R7715? 1WATTR82150?R83100?R84100? VariableR87, R88, R89, R901.5K 5WATTR91, R9251?R9322.1?R94, R95, R98, R99, R104, R105, R108, R1091.2? 1/2WATTC21, C221000F 35V ElectrolyticC23, C241F 25V ElectrolyticC28, C31470F 100V Electr

40、olyticC43100F 10V ElectrolyticC44, C45, C46, C474700F 100V ElectrolyticC48.1FC4933F 50V ElectrolyticC504.7F 50V ElectrolyticC52330F 16V ElectrolyticPage 10Klipsch Subwoofer Amplifier Service ManualKSAMM-002aSW12-I PARTS LIST(continued)PARTVALUE/PART NUMBERKLIPSCH PART #C5410F 25V ElectrolyticC56.1F

41、125VacD1, D2, D3, D4, D11, D121N4002D13, D14, D15, D16, D171N914Q15, Q18MJF15030118733Q16, Q17, Q19, Q202SC3281118731Q21, Q24MJF15031118734Q22, Q23, Q25, Q262SA1302118729Q27MPSA06U11UPC1237118746U12MC1458118743U77815118739U97915118740L12HF2, F3JUMPERRLY1AROMAT J51E-12 (Relay)RCA PANEL SPEAKER INPUT

42、JACKSTRANSFORMERPW-6582118721SW2 (Power) F15 Amp 250Vac Slow Blow118348TH1 (Thermal protection) ASAH US-602SBR1GBPC 3502DUAL VOLTAGE TRANSFORMERPW-6661118725DUAL VOLTAGE SWITCH 115 to 230CAPACITOR (DUAL VOLTAGE MODEL) .047F 300VPage 11Klipsch Subwoofer Amplifier Service ManualKSAMM-002aSW15-I PARTS

43、LISTPARTVALUE/PART NUMBERKLIPSCH PART #LEVEL CONTROL 10K VARIABLELOWPASS ADJUST50K VARIABLE, DUALPHASE ADJUST100K VARIABLER1, R2, R3, R128, R137, R13815KR12, R1147KR13, R35, R36, R133, R13422KR1322.2 MegR13939KR14, R216.65KR1520KR16, R18, R19, R40, R41, R12710KR175.23KR202KR2230.1KR28, R29220KR30, R

44、34, R5010K VARIABLER31, R32, R37100KR33, R42, R68, R71100?R3843K 2%R39180K 2%R43, R4410K 2%R6, R8, R464.7KR47, R534.3K 3WATTR90?R4933.2KR51, R671KR54, R621.1KR55, R63300?R56, R6111.5KR57, R58, R59, R60220?R6, R8510? 2WATTR64, R69511?R65, R70, R73, R7522.1?R6639.2KR72, R742.7K 3WATTR10120KR451M?R747?

45、R4, R5 300KC1, C2.22FC10, C27, C30.1FC11.12FC15, C53.047FC16, C17, C191F 25V ElectrolyticC20.01FC5.001FC292.2FC3, C4 150F 100V NON-POLARC32, C33470F 50V ElectrolyticC34, C3522pFPage 12Klipsch Subwoofer Amplifier Service ManualKSAMM-002aSW15-I PARTS LIST(continued)PARTVALUE/PART NUMBERKLIPSCH PART #C

46、36, C37, C39, C40330pFC64.7F 25V ElectrolyticC5510F 63V ElectrolyticC1810F 25V ElectrolyticC7.0027FC8, C91FD181N914BD5, D61N4752A ZenerU1MC4741118744U2, U4MC1458N118743U5NE570118745U6LM393118742Q1, Q2, Q11MPS8099118735Q282N3906118728Q3, Q4, Q12MPS8599118736Q5MPSW56118738Q6MPSW06118737Q7, Q92SA1306B1

47、18730Q8, Q102SC3298B118732R100, R101, R102, R103, R110, R111, R112, R113.47? 5WATTR1144.7? 3WATTR1151? 3WATTR116, R121, R126, R13010KR117, R11956KR11822KR120390? 1WATTR122, R123100KR12568?R13110K VariableR1351.8KR1366.8KR76, R7715? 1WATTR82150?R83100?R84100? VariableR87, R88, R89, R901.5K 5WATTR91,

48、R9251?R9322.1?R94, R95, R98, R99, R104, R105, R108, R1091.2? 1/2WATTC21, C221000F 35V ElectrolyticC23, C241F 25V ElectrolyticC28, C31470F 100V ElectrolyticC43100F 10V ElectrolyticC44, C45, C46, C474700F 100V ElectrolyticC48.1FC4933F 50V ElectrolyticC504.7F 50V ElectrolyticC52330F 16V ElectrolyticPag

49、e 13Klipsch Subwoofer Amplifier Service ManualKSAMM-002aSW15-I PARTS LIST(continued)PARTVALUE/PART NUMBERKLIPSCH PART #C5410F 25V ElectrolyticC56.1F 125VacD1, D2, D3, D4, D11, D121N4002D13, D14, D15, D16, D171N914Q15, Q18MJF15030118733Q16, Q17, Q19, Q202SC3281118731Q21, Q24MJF15031118734Q22, Q23, Q2

50、5, Q262SA1302118729Q27MPSA06U11UPC1237118746U12MC1458118743U77815118739U97915118740L12HF2, F3JUMPERRLY1AROMAT J51E-12 (Relay)RCA PANEL SPEAKER INPUT JACKSTRANSFORMERPW-6582118721SW2 (Power) F15 Amp 250Vac Slow Blow118348TH1 (Thermal protection) ASAH US-602SBR1GBPC 3502DUAL VOLTAGE TRANSFORMERPW-6661