JBL-PB12_MK3-sub-sm 维修电路原理图.pdf

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1、JBL, Incorporated250 Crossways Park DriveWoodbury, New York 11797REV 3 5/02PowerBassSeriesPB12SubwooferSERVICE MANUALRadioFans.CN 收音机爱 好者资料库PB122TABLE OF CONTENTSSafety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Basic S

2、pecifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Detailed Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Controls and their Function . . . . . . . . .

3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6Speaker Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . . . . . . . . . .10Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11Test Setup and Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12Ser

5、vice Bulletin JBL 2001-03 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13Service Bulletin JBL 2001-04 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14Service Bulletin JBL 2001-05 . . . . . . . . . . . . .

6、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16Service Bulletin JBL 2001-07 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17Exploded and Packaging Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7、. . . . . .18Amplifier Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19Amplifier Faceplate/Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20Integrated Circuit Diagrams . . . . .

8、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21Testing Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23Block Diagram Revision 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9、 . . . . . . . . . . . . . . . . . . .29Electrical Parts List (PCB version 6.3 7.0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30Electrical Parts List (PCB version 7.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34Electrical Parts Lis

10、t Revision 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38Printed Circuit Boards (PCB version 6.3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41Printed Circuit Boards (PCB version 6.4) . . . . . . . . . . . . . . . . . .

11、 . . . . . . . . . . . . . . . . . . . .44Printed Circuit Boards (PCB version 7.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45Preamp Schematics (PCB version 6.3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48Power Amp Schematics (P

12、CB version 6.0 6.3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49Power Amp Schematics (PCB version 7.0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50Preamp Schematics (PCB version 7.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13、 . . . . . . .51Power Amp Schematics (PCB version 7.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52Preamp Schematics (Revision 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53Power Amp Schematics (Revision 2) . . . . . . . .

14、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54PB12 DIFFERENCES IN REVISION 1 AND REVISION 2REVISION 1REVISION 2Amplifier faceplate says “Made in Canada”Amplifier serial number starts with “AM”Amplifier serial number starts with “HA”Black (or silver) potted, non-serviceable outpu

15、t moduleOutput transistors in the open, on a large black heatsinkLarge plastic cup enclosing the rear of the amp assemblyMain PCB, bottom, solder-side contains all SMD devices“Made in Mexico” label on outer part of cabinetBOTH VERSIONS OF THESE AMPLIFIERS ARE NOT CONSIDERED INTERCHANGEABLE; THEY ARE

16、 NOT ADROP-IN REPLACEMENT IN THE CABINET OF THE OTHER VERSION.RadioFans.CN 收音机爱 好者资料库PB123WarningAny person performing service of this unit will be exposedto hazardous voltages and the risk of electric shock. It isassumed that any person who removes the amplifier fromthis cabinet has been properly t

17、rained in protectingagainst avoidable injury and shock. Therefore, any serviceprocedures are to be performed by qualified servicepersonal ONLY!CautionBefore the amplifier is plugged in, be sure its ratedvoltage corresponds to the voltage of the AC powersource to be used. Incorrect voltage could caus

18、e damageto the amplifier when the AC power cord is plugged in. Donot exceed rated voltage by more than 10%: operationbelow 90% of rated voltage will cause poor performanceor may shut the unit off.Leakage/Resistance CheckBefore returning the unit to the customer, perform aleakage or resistance test a

19、s follows:Leakage Current. Connect the unit to its rated powersource. Using an ammeter, measure the current betweenthe neutral side of the AC supply and chassis ground ofthe unit under test. If leakage current exceeds 0.5mA, theunit is defective. Reverse the polarity of the AC supplyand repeat.Resis

20、tance. Measure the resistance from either side of theline 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 itfails one of these tests until the problem is located andcorrected.Critical ComponentsAll components identified wi

21、th the IECsymbol in the parts list and schematicdiagram designate components in whichsafety can be of special significance whenreplacing a component identified with. Useonly the replacement parts designated in the parts list orparts with the same rating of resistance, wattage or voltage.SAFETY INFOR

22、MATIONList of Safety Components Requiring Exact ReplacementsRevision 1Revision 2DescriptionF1 - 80117093-105202-300Line Fuse Slo Blo 2.0A PWRCORD083-041802-009250V UL approved80105SPT-2 or better with polarized plug, UL approved wired with the hot side to fused side. Use with factory replacement pan

23、el strain relief (70305) only.TRX042-010053-003Power Transformer. Use80116only factory replacement.BR RECTBR1Bridge diode. Use only50100052-400080-000factory replacement.C1,2C6,8Large electrolytic filter(2200uF 100V)(3300uf 80v)caps. Be sure 30710034-470745-200replacement part is at least the same w

24、orking voltage 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 low30718df radial. (On Power amp PCB)S64AMIDoes not applyPower output module.60302 Use only fact

25、ory replacementFaceplaten/aUse only factory70325replacementRear Amp Cover063-531808-000Use only factoryDoes not applyreplacementInductorDoes not applyCMC - Use only factory80100replacementInductorDoes not applyL1 - Use only factory80121replacementDoes not applyInductorL2 - Use only factory043-300101

26、-000replacementDoes not applyInductorL3 - Use only factory043-700101-000replacementPB124Output Power250 watts RMSDriver12 WooferFrequency Response25Hz Low-Pass Frequency settingInputsLine Level (option: LFE); Speaker LevelOutputsSpeaker level fixed frequency 150HzLow-Pass FrequencyVariable from 50Hz

27、 150HzHigh-Pass Frequency150Hz when using Speaker Level OutputDimensions (H x W x D)15 1/2 x 15 x 16394mm x 381mm x 406mm(with feet) 17 1/2 x 15 x 16445mm x 381mm x 406mmWeight40 lb/18.2kgRefinements may be made on occasion to existing products without notice but will always meet or exceed originals

28、pecifications unless otherwise stated.PowerBass is a registered trademark of JBL, Incorporated.00261-1BASIC SPECIFICATIONS PB12 SubwooferPB125JBL PB12 250W Powered Sub AmpLINE VOLTAGEYes/NoHi/Lo LineNom.UnitNotesUS 120vac/60HzYes108- 132120VrmsNormal OperationEU 230vac/50- 60HzYes207- 264230VrmsNorm

29、al operation, MOMS requiredParameterSpecificationUnitQA Test LimitsConditionsNotesAmp SectionType (Class AB, D, other)Dn/an/aLoad Impedance (speaker)5.6Ohmsn/aNominalRated Output Power (120VAC)250Watts140Domestic version only 120 VAC- 60 HzRated Output Power (230VAC)250Watts130EU Version only 230 VA

30、C- 50 HzTHD Rated Power0.3%122k filter145 WattsTHD 1 Watt0.1%0.522k filterDC Offset10mV- DC20 Speaker OutputsDamping factor50DF35Measured at amplifier board At spkr cable. 150 Watts THD LP T 1M (NO LOAD)Resistance from V+ (C6 P+) to V- (C8 P-) gradually Fully CHARGED should read 10k Resistance from

31、V+ (C6 P+) to S+ (SPK O/P) should read 1MResistance 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 AMPLEDP-U4(1)P-U4(7)RED0Vrms11.84VDCGREEN7.13Vrms-12.93VDC3. D.C. Operation -Voltage me

32、asurements (DVM) on CLASS D POWER AMPBetweenV+Q4(E)Q1(C)Q10(C)U7(1)U7(2)U7(4)U7(6)U7(7)U7(8)And ThisPointGNDV-GNDGNDGNDGNDGNDGNDGNDGNDGet thisReading71.7V0V-71.7V0V-71.7V-71.5V-71.2V0V0V4.65V4. Check Switching Frequency Oscilloscope - USE THE PROBE TIP TO U6(7) TO GND Reading 100kHz +/-10%,24Vp-pB.

33、Pre Amp SectionLine Level Input Sensitivity -Set upTurn level, XOVER FREQ POT Fully CW and LFE switch offGenerator Set at 200mV50HzSignal to Line level inputPB1227PB12 Testing Procedure (Cont.) (Revision 2 Only) - Voltage measurementsOP AMPU2(1)U2(14)U2(8)U3(7)U3(1)U3(14)U3(8)U5(7)U5(1)SPEAKERO/P306

34、.9mV461mV460mV658mV628mV598mV2.326V2.02V3.57V23.33V2. High Level Input Sensitivity -Set upTurn level, XOVER FREQ POT Fully CW and LFE switch off Set Generator at 1.3V50HzSignal to High level input -Voltage measurements 15.3V at speaker output3. Low- Pass -Set upSet Generator at 200 mV100HzSignal to

35、Line level inputMeasure voltage at S+ speaker output -Voltage measurementXOVER FREQ. SettingOutputCW14.03VCCW4.8V4. LFE -Set upSet Generator at 200mV200HzSignal to Line level inputMeasure voltage at S+ speaker outputLFE switch SettingOutputNormal6VLFE18.32VSee flow chart next page for diagnostics.PB

36、1228PB12 Testing Procedure (Cont.) (Revision 2 Only)PB12 POWER MODULE TESTING FLOW CHARTCAUTION : SPEAKER OUTPUT IS FLOATING AND IS NOT PROTECTED AGAINST A SHORT TO GROUND. ALL TEST INSTRUMENTS CONNECTED TO THE OUTPUT MUST BE FLOATING. ATTACH THE SCOPE PROBE TIP TO S - and REFERENCE LEAD TO S+. (A 1

37、0mV 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 yesSTARTCheck +/- 15V- MOD+/- 15V voltage atU 6(8),U6(4)Discharge C37,Check fusetransformer, L4,rectifier, C6 and C8Use scope to checkswitchingfrequency U6(7)100KHz +/- 10% , 24Vp- p

38、Check Q4(E)TO V- = 0V D.C.Power up with nosignal inputLED REDOKOKOKOKOKOKOKOKCheckMUTE(+8V) andQ24,Q25,Q26Use scope tocheck O/P U7(6)and GND143Vp- p squarewave shownCheckL2,L3,C71,C72,C73,C74I/P:10mv/50HZCheck +15V/SWQ4(E) TO V-15VReplaceQ18,Q22CLASS D AMP OKENDCheckU7,Q16,Q17,Q20,Q21,R87,D26,D35,C6

39、4CheckFB1,FB2,C45,C50,C60,C63,R81,R82CheckU7(1) = - 58.3VCheckMUTE(- 12.9V),AndQ24,Q25,Q26Resistance check(no load)between V+ V- ,V+ O/P,V- O/Pand O/P to GNDis 10K29PB12 Block Diagram Revision 2 OnlyRinLinRoutLoutLine LevelInputDIF. AMPSUMMI NG AMPVOLUME CTRLPHASE CTRL SWITCHAMP STAGE12dB/OctaveHPFL

40、PF12dB/Octave12dB/OctaveLPFVariableSUMMI NG AMPLIMITER / LPFMUTE DC OFFSETPROTECTION THERMALPROTECTION CURRENTPROTECTION LINEARPOWER SUPPLY* FUSEMUTESIGNAL SENSE ATOSIGNAL SENEINGEXTERNAL LED INDICATORSCONTROLLED REGULATOR CLASS D AMPLIFIER+15V SWMUTE OUTPUT-RELAY5.6 OHMSLFENORMALNOTE : 120 VAC T2A-

41、250V230 VAC T1.25A-250VSPEAKER LEVEL INPUTF1ED32CBA1234768FED5RevNoRevision note67CBChecked8DateSignatureAPB1230PB12 Electrical Parts List (Revision 1 Only)PB12 POWER AMP section of PCB Version 6.3 -7.0.Part #DesignatorDescription50100BR RECTRS6046AMPBridge rectifier50105D11N4744A15V1w Zener50112D10

42、1N5242B12V.5w Zener50104D111N4148Sig Diode50112D121N5242B12V.5w Zener50104D131N4148Sig Diode50104D141N4148Sig Diode50105D21N4744A15V1w Zener50114D31N5265B62V.5w Zener50104D41N4148Sig Diode50113D51N4735A6.2V1W50103D61N5234B6V.5w Zener50104D71N4148Sig Diode50104D81N4148Sig Diode60157Q12N545725VN-chnl

43、FET60155Q102N5401120VPNP 600mA60155Q112N5401120VPNP 600mA60156Q122N440140VNPN 600mA60102U1TLO64Quad OpAmpCapacitors30710C12200uF100V+80 / -20Electrolytic 105C30718C104u7F100VBP/NP Electr DF.130523C11330nF100Vmono ceramic30710C22200uF100V+80 / -20Electrolytic 105C30532C20220nF250Vmetallized polyester

44、30502C21100nF50Vmono ceramic30502C22100nF50Vmono ceramic30527C24330nF50Vmono ceramicC25NOT USED30508C2610nF50Vmono ceramic30513C273n3F50Vmono ceramic30502C3100nF50Vmono ceramic30711C3222uF35V+80/-20Electrolytic30715C4010uF16V+80/-20Electrolytic30716C411uF16V+80/-20Electrolytic30717C42100uF16V+80/-20

45、Electrolytic30502C6100nF50Vmono ceramic30521C7A100nF250Vceramic/film30521C7B100nF250Vceramic/filmCWNOT USED30505CZ100nF100Vceramic/filmPB1231PB12 Electrical Parts List (Revision 1 Only)PB12 POWER AMP section of PCB Version 6.3 -7.0.Part #DesignatorDescriptionResistorsR100NOT USED40105R10A0.1R.5Wmeta

46、l40105R10B0.1R.5Wmetal40105R10C0.1R.5Wmetal40420R111k.25Wcarbon40420R121k.25Wcarbon40417R1347k.25Wcarbon40718R143k3.25WcarbonR15NOT USED40735R1A7k52Wmetal40735R1B7k52Wmetal40735R1C7k52Wmetal40405R214K7.25Wcarbon40736R2242K2.25Wmetal40737R23187k.25WmetalR24NOT USEDR25NOT USED40722R266k8.25Wcarbon4073

47、8R2710k2Wmetal40739R281k20.25Wcarbon40739R291k20.25Wcarbon40735R2A7k52Wmetal40735R2B7k52Wmetal40735R2C7k52Wmetal40703R38M2.25Wcarbon40738R3010k2Wmetal40417R3147k.25Wcarbon40417R3247k.25Wcarbon40427R3323k7.25Wmetal40403R3410k.25Wmetal40740R433k1Wmetal40420R401k.25Wcarbon40701R411000k.25Wcarbon40741R4

48、222k.5Wmetal40701R431000k.25Wcarbon40406R44100k.25Wcarbon40415R45470K.25Wcarbon40701R461000k.25Wcarbon40409R4710k.25Wcarbon40409R4810k.25Wcarbon40726R4915k.25Wcarbon40732R556k2.25Wmetal40727R502k2.25Wcarbon40111R647R.25Wcarbon40738R7A10k2Wmetal40738R7B10k2Wmetal40738R7C10k2Wmetal40738R8A10k2Wmetal40

49、738R8B10k2WmetalR9NOT USEDPB1232PB12 Electrical Parts List (Revision 1 Only)PB12 POWER AMP section of PCB Version 6.3 -7.0.Part #DesignatorDescriptionMiscellaneous80121L1220uH5 AmpGapped Ecore choke80122L28u5H5 Ampferrite bead80122L38u5H5 Ampferrite bead80122L48u5H5 Ampferrite bead80100CMC2m2H5 Ampc

50、hoke60302MODULES64AMI108326Led HarnessWith two LEDs,Molex plug Glued into cabinet80116TransformerMCI4632100VA4632 transformer70151SwitchSW SPSTPower Switch70322LED socketPCB mount LED socket801173AG FUSE2A SloBlo T type703240.187 PCB Tabs770323PCB Fuse Holders270325PB12 faceplatePB12 faceplate80105P