JBL-PB12-sub-sm 电路图 维修手册.pdf

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1、 PowerBass Series PB12 Powered Subwoofer Service Manual JBL Consumer Products 250 Crossways Park Dr. Woodbury, New York 11797 Rev10 2/2004 RadioFans.CN 收音机爱 好者资料库 PB12 TABLE OF CONTENTS Safety Information .3 Basic Specifications .4 Detailed Specifications .5 Controls and their Function.6 Connections

2、 .7 Operation 10 Troubleshooting.11 Test Setup and Procedure .12 Service Bulletin JBL 2001-03 .13 Service Bulletin JBL 2001-04 .14 Service Bulletin JBL 2001-05 .17 Service Bulletin JBL 2001-07 .18 Service Bulletin JBL 2001-08 .19 Tech Tip JBLTT2003-04.20 Exploded View/Packaging.21 Amplifier Exploded

3、 View .22 Amplifier Faceplate/Access.23 Integrated Circuit Diagrams.24 Testing Procedures. 26 Block Diagram Revision 232 Electrical Parts List (PCB version 6.3 7.0) 33 Electrical Parts List (PCB version 7.2) .37 Electrical Parts List Revision 2.41 Printed Circuit Boards (PCB version 6.3).44 Printed

4、Circuit Boards (PCB version 6.4).47 Printed Circuit Boards (PCB version 7.2) .48 Schematics Version 1 Preamp (PCB version 6.3) .51 Power Amp (PCB version 6.0 -6.3). .52 Power Amp (PCB version 7.0) .53 Preamp (PCB version 7.2) .54 Power Amp (PCB version 7.2). .55 Schematics Version 2.56 PB12 DIFFEREN

5、CES IN REVISION 1 AND REVISION 2 REVISION 1 REVISION 2 Amplifier faceplate says “Made in Canada” Amplifier serial number starts with “AM” Black (or silver) potted, non-serviceable output module Amplifier serial number starts with “HA” Output transistors in the open, on a large black heatsink Large p

6、lastic cup enclosing the rear of the amp assembly Main PCB, bottom, solder-side contains all SMD devices “Made in Mexico” label on outer part of cabinet BOTH VERSIONS OF THESE AMPLIFIERS ARE NOT CONSIDERED INTERCHANGEABLE; THEY ARE NOT A DROP-IN REPLACEMENT IN THE CABINET OF THE OTHER VERSION. Radio

7、Fans.CN 收音机爱 好者资料库 2 PB12 3 Warning Any person performing service of this unit will be exposed to hazardous voltages and the risk of electric shock. It is assumed that any person who removes the amplifier from this cabinet has been properly trained in protecting against avoidable injury and shock. T

8、herefore, any service procedures are to be performed by qualified service personal ONLY! Caution Before the amplifier is plugged in, be sure its rated voltage corresponds to the voltage of the AC power source to be used. Incorrect voltage could cause damage to the amplifier when the AC power cord is

9、 plugged in. Do not exceed rated voltage by more than 10%: operation below 90% of rated voltage will cause poor performance or may shut the unit off. Leakage/Resistance Check Before returning the unit to the customer, perform a leakage or resistance test as follows: Leakage Current. Connect the unit

10、 to its rated power source. Using an ammeter, measure the current between the neutral side of the AC supply and chassis ground of the unit under test. If leakage current exceeds 0.5mA, the unit is defective. Reverse the polarity of the AC supply and repeat. Resistance. Measure the resistance from ei

11、ther side of the line cord to chassis ground, If it is less than 500k ohms, the unit is defective. WARNING! DO NOT return the unit to the customer if it fails one of these tests until the problem is located and corrected. Critical Components All components identified with the IEC symbol in the parts

12、 list and schematic diagram designate components in which safety can be of special significance when replacing a component identified with. Use only the replacement parts designated in the parts list or parts with the same rating of resistance, wattage or voltage. SAFETY INFORMATION List of Safety C

13、omponents Requiring Exact Replacements Revision 1Revision 2Description F1 - 80117093-105202-300Line Fuse Slo Blo 2.0A PWRCORD083-041802-009250V UL approved 80105SPT-2 or better with polarized plug, UL approved wired with the hot side to fused side. Use with factory replacement panel strain relief (7

14、0305) only. TRX042-010053-003Power Transformer. Use 80116only factory replacement. BR RECTBR1Bridge diode. Use only 50100052-400080-000factory replacement. C1,2C6,8Large electrolytic filter (2200uF 100V)(3300uf 80v)caps. Be sure 30710034-470745-200replacement part is at least the same working voltag

15、e and capacitance rating. Also the lead spacing is important. Incorrect spacing may cause premature failure due to internal cabinet pressure and vibration. C10Does not apply4.7uF, 100 volt NPE low 30718df radial. (On Power amp PCB) S64AMIDoes not applyPower output module. 60302 Use only factory repl

16、acement Faceplaten/aUse only factory 70325replacement Rear Amp Cover063-531808-000Use only factory Does not applyreplacement InductorDoes not applyCMC - Use only factory 80100replacement InductorDoes not applyL1 - Use only factory 80121replacement Does not applyInductorL2 - Use only factory 043-3001

17、01-000replacement Does not applyInductorL3 - Use only factory 043-700101-000replacement RadioFans.CN 收音机爱 好者资料库 PB12 4 Output Power250 watts RMS Driver12 Woofer Frequency Response25Hz Low-Pass Frequency setting InputsLine Level (option: LFE); Speaker Level OutputsSpeaker level fixed frequency 150Hz

18、Low-Pass FrequencyVariable from 50Hz 150Hz High-Pass Frequency150Hz when using Speaker Level Output Dimensions (H x W x D)15 1/2 x 15 x 16 394mm x 381mm x 406mm (with feet) 17 1/2 x 15 x 16 445mm x 381mm x 406mm Weight40 lb/18.2kg Refinements may be made on occasion to existing products without noti

19、ce but will always meet or exceed original specifications unless otherwise stated. PowerBass is a registered trademark of JBL, Incorporated. 00261-1 BASIC SPECIFICATIONS PB12 Subwoofer PB12 5 JBL PB12 250W Powered Sub Amp LINE VOLTAGEYes/NoHi/Lo LineNom.UnitNotes US 120vac/60HzYes108- 132120VrmsNorm

20、al Operation EU 230vac/50- 60HzYes207- 264230VrmsNormal operation, MOMS required ParameterSpecificationUnitQA Test Limits ConditionsNotes Amp Section Type (Class AB, D, other)Dn/an/a Load Impedance (speaker)5.6Ohmsn/aNominal Rated Output Power (120VAC)250Watts140Domestic version only 120 VAC- 60 Hz

21、Rated Output Power (230VAC)250Watts130EU Version only 230 VAC- 50 Hz THD Rated Power0.3%122k filter145 Watts THD 1 Watt0.1%0.522k filter DC Offset10mV- DC20 Speaker Outputs Damping factor50DF35Measured at amplifier board At spkr cable. 150 Watts THD LP T 1M (NO LOAD) Resistance from V+ (C6 P+) to V-

22、 (C8 P-) gradually Fully CHARGED should read 10k Resistance from V+ (C6 P+) to S+ (SPK O/P) should read 1M Resistance from V- (C8 P-) to S+ (SPK O/P) should read 1M 2. Power UpLED RED With a 5mV signal to Low level input, LED should change to GREEN -Voltage measurements (DVM) OP AMP LEDP-U4(1)P-U4(7

23、) RED0Vrms11.84VDC GREEN7.13Vrms-12.93VDC 3. D.C. Operation -Voltage measurements (DVM) on CLASS D POWER AMP BetweenV+Q4(E)Q1(C)Q10(C)U7(1)U7(2)U7(4)U7(6)U7(7)U7(8) And This Point GNDV-GNDGNDGNDGNDGNDGNDGNDGND Get this Reading 71.7V0V-71.7V0V-71.7V-71.5V-71.2V0V0V4.65V 4. Check Switching Frequency O

24、scilloscope - USE THE PROBE TIP TO U6(7) TO GND Reading 100kHz +/-10%,24Vp-p B. Pre Amp Section Line Level Input Sensitivity -Set upTurn level, XOVER FREQ POT Fully CW and LFE switch off Generator Set at 200mV50Hz Signal to Line level input PB12 30 PB12 Testing Procedure (Cont.) (Revision 2 Only) -

25、Voltage measurements OP AMP U2(1)U2(14)U2(8)U3(7)U3(1)U3(14)U3(8)U5(7)U5(1) SPEAKER O/P 306.9mV461mV460mV658mV628mV598mV2.326V2.02V3.57V23.33V 2. High Level Input Sensitivity -Set upTurn level, XOVER FREQ POT Fully CW and LFE switch off Set Generator at 1.3V50Hz Signal to High level input -Voltage m

26、easurements 15.3V at speaker output 3. Low- Pass -Set upSet Generator at 200 mV100Hz Signal to Line level input Measure voltage at S+ speaker output -Voltage measurement XOVER FREQ. SettingOutput CW14.03V CCW4.8V 4. LFE -Set upSet Generator at 200mV200Hz Signal to Line level input Measure voltage at

27、 S+ speaker output LFE switch SettingOutput Normal6V LFE18.32V See flow chart next page for diagnostics. PB12 31 PB12 Testing Procedure (Cont.) (Revision 2 Only) PB12 POWER MODULE TESTING FLOW CHART CAUTION : SPEAKER OUTPUT IS FLOATING AND IS NOT PROTECTED AGAINST A SHORT TO GROUND. ALL TEST INSTRUM

28、ENTS CONNECTED TO THE OUTPUT MUST BE FLOATING. ATTACH THE SCOPE PROBE TIP TO S - and REFERENCE LEAD TO S+. (A 10mV signal may need from the input to trigger the Switch turn on) no no yes yes no no yes yes no no yes yes no no yes yes START Check +/- 15V- MOD +/- 15V voltage at U 6(8),U6(4) Discharge

29、C37, Check fuse transformer, L4, rectifier, C6 and C8 Use scope to check switching frequency U6(7) 100KHz +/- 10% , 24Vp- p Check Q4(E) TO V- = 0V D.C. Power up with no signal input LED RED OK OK OK OK OK OK OK OK Check MUTE(+8V) and Q24,Q25,Q26 Use scope to check O/P U7(6) and GND 143Vp- p square w

30、ave shown Check L2,L3,C71,C72, C73,C74 I/P:10mv/50HZ Check +15V/SW Q4(E) TO V- 15V Replace Q18,Q22 CLASS D AMP OK END Check U7,Q16,Q17, Q20,Q21,R87, D26,D35,C64 Check FB1,FB2,C45, C50,C60,C63, R81,R82 Check U7(1) = - 58.3V Check MUTE(- 12.9V), And Q24,Q25,Q26 Resistance check (no load) between V+ V-

31、 , V+ O/P,V- O/P and O/P to GND is 10K 32 PB12 Block Diagram Revision 2 Only Rin Lin Rout Lout Line Level Input DIF. AMPSUMMI NG AMP VOLUME CTRL PHASE CTRL SWITCH AMP STAGE 12dB/Octave HPFLPF 12dB/Octave12dB/Octave LPF Variable SUMMI NG AMP LIMITER / LPF MUTE DC OFFSET PROTECTION THERMAL PROTECTION

32、CURRENT PROTECTION LINEAR POWER SUPPLY * FUSE MUTE SIGNAL SENSE ATO SIGNAL SENEING EXTERNAL LED INDICATORS CONTROLLED REGULATOR CLASS D AMPLIFIER +15V SW MUTE OUTPUT-RELAY 5.6 OHMS LFE NORMAL NOTE : 120 VAC T2A-250V 230 VAC T1.25A-250V SPEAKER LEVEL INPUT F 1 E D 32 C B A 1234 768 F E D 5 RevNoRevis

33、ion note 67 C B Checked 8 DateSignature A PB12 33 PB12 Electrical Parts List (Revision 1 Only) PB12 POWER AMP section of PCB Version 6.3 -7.0. Part #DesignatorDescription 50100BR RECTRS6046AMPBridge rectifier 50105D11N4744A15V1w Zener 50112D101N5242B12V.5w Zener 50104D111N4148Sig Diode 50112D121N524

34、2B12V.5w Zener 50104D131N4148Sig Diode 50104D141N4148Sig Diode 50105D21N4744A15V1w Zener 50114D31N5265B62V.5w Zener 50104D41N4148Sig Diode 50113D51N4735A6.2V1W 50103D61N5234B6V.5w Zener 50104D71N4148Sig Diode 50104D81N4148Sig Diode 60157Q12N545725VN-chnl FET 60155Q102N5401120VPNP 600mA 60155Q112N540

35、1120VPNP 600mA 60156Q122N440140VNPN 600mA 60102U1TLO64Quad OpAmp Capacitors 30710C12200uF100V+80 / -20Electrolytic 105C 30718C104u7F100VBP/NP Electr DF.1 30523C11330nF100Vmono ceramic 30710C22200uF100V+80 / -20Electrolytic 105C 30532C20220nF250Vmetallized polyester 30502C21100nF50Vmono ceramic 30502

36、C22100nF50Vmono ceramic 30527C24330nF50Vmono ceramic C25NOT USED 30508C2610nF50Vmono ceramic 30513C273n3F50Vmono ceramic 30502C3100nF50Vmono ceramic 30711C3222uF35V+80/-20Electrolytic 30715C4010uF16V+80/-20Electrolytic 30716C411uF16V+80/-20Electrolytic 30717C42100uF16V+80/-20Electrolytic 30502C6100n

37、F50Vmono ceramic 30521C7A100nF250Vceramic/film 30521C7B100nF250Vceramic/film CWNOT USED 30505CZ100nF100Vceramic/film PB12 34 PB12 Electrical Parts List (Revision 1 Only) PB12 POWER AMP section of PCB Version 6.3 -7.0. Part #DesignatorDescription Resistors R100NOT USED 40105R10A0.1R.5Wmetal 40105R10B

38、0.1R.5Wmetal 40105R10C0.1R.5Wmetal 40420R111k.25Wcarbon 40420R121k.25Wcarbon 40417R1347k.25Wcarbon 40718R143k3.25Wcarbon R15NOT USED 40735R1A7k52Wmetal 40735R1B7k52Wmetal 40735R1C7k52Wmetal 40405R214K7.25Wcarbon 40736R2242K2.25Wmetal 40737R23187k.25Wmetal R24NOT USED R25NOT USED 40722R266k8.25Wcarbo

39、n 40738R2710k2Wmetal 40739R281k20.25Wcarbon 40739R291k20.25Wcarbon 40735R2A7k52Wmetal 40735R2B7k52Wmetal 40735R2C7k52Wmetal 40703R38M2.25Wcarbon 40738R3010k2Wmetal 40417R3147k.25Wcarbon 40417R3247k.25Wcarbon 40427R3323k7.25Wmetal 40403R3410k.25Wmetal 40740R433k1Wmetal 40420R401k.25Wcarbon 40701R4110

40、00k.25Wcarbon 40741R4222k.5Wmetal 40701R431000k.25Wcarbon 40406R44100k.25Wcarbon 40415R45470K.25Wcarbon 40701R461000k.25Wcarbon 40409R4710k.25Wcarbon 40409R4810k.25Wcarbon 40726R4915k.25Wcarbon 40732R556k2.25Wmetal 40727R502k2.25Wcarbon 40111R647R.25Wcarbon 40738R7A10k2Wmetal 40738R7B10k2Wmetal 4073

41、8R7C10k2Wmetal 40738R8A10k2Wmetal 40738R8B10k2Wmetal R9NOT USED PB12 35 PB12 Electrical Parts List (Revision 1 Only) PB12 POWER AMP section of PCB Version 6.3 -7.0. Part #DesignatorDescription Miscellaneous 80121L1220uH5 AmpGapped Ecore choke 80122L28u5H5 Ampferrite bead 80122L38u5H5 Ampferrite bead

42、 80122L48u5H5 Ampferrite bead 80100CMC2m2H5 Ampchoke 60302MODULES64AMI 108326Led HarnessWith two LEDs,Molex plug Glued into cabinet 80116TransformerMCI4632100VA4632 transformer 70151SwitchSW SPSTPower Switch 70322LED socketPCB mount LED socket 801173AG FUSE2A SloBlo T type 703240.187 PCB Tabs7 70323

43、PCB Fuse Holders2 70325PB12 faceplatePB12 faceplate 80105Power cordPower cord 70305Strain reliefStrain relief PB12 PREAMP PCB Version #6.3 Part #DesignatorDescription Semiconductors 60102U1TLO 64OP amp 60100U2LM324OP amp CapacitorsFilm Caps may be used in any position EXCEPT C1,C2 30707C1200uF50VBP

44、Electrolytic 30504C10100nF50Vmono ceramic 30504C11100nF50Vmono ceramic 30504C12100nF50Vmono ceramic 30504C13100nF50Vmono ceramic 30530C16100nF50Vmono ceramic 30531C17150nF50Vmono ceramic 30100C18330pF50Vmono ceramic 30100C19330pF50Vmono ceramic 30707C2200uF50VBP Electrolytic 30502C20100nF50Vmono cer

45、amic 30502C21100nF50Vmono ceramic 30502C22100nF50Vmono ceramic 30502C23100nF50Vmono ceramic 30101C3220pF50Vmono ceramic C30NOT USED 30101C4220pF50Vmono ceramic 30101C5220pF50Vmono ceramic 30101C6220p50Vmono ceramic C70r C80r 40730C91k.25WMetal Resistor PB12 36 PB12 Electrical Parts List (Revision 1

46、Only) PB12 POWER AMP section of PCB Version 6.3 -7.0. Part #DesignatorDescription Resistors 40405R14k7.25Wcarbon 40409R1010k.25Wcarbon 40731R1159k.25Wcarbon 40504R1245k3.25Wmetal 40412R1333k2.25Wmetal 40709R1468k1.25Wmetal R15NOT USED R16NOT USED 40732R1756k2.25Wmetal 40722R186k8.25Wcarbon 40722R196

47、k8.25Wcarbon 40405R24k7.25Wcarbon 40722R206k8.25Wcarbon R210r 40722R226k8.25Wcarbon R230r 40109R24604r.25Wmetal 40412R2533k2.25Wmetal 40405R264k7.25Wmetal 40109R27604r.25Wmetal 40412R2833k2.25Wmetal 40406R3100k.25Wcarbon 40403R3010k.25Wmetal 40733R3312k1.25Wmetal 40734R34120k.25Wmetal 40451R35137k.25Wmetal 40406R4100k.25Wcarbon 40406R5100k.25Wcarb