JBL-PB12_MK3-sub-sm 电路图 维修手册.pdf

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1、JBL, Incorporated 250 Crossways Park Drive Woodbury, New York 11797 REV 3 5/02 PowerBassSeries PB12Subwoofer SERVICE MANUAL RadioFans.CN 收音机爱 好者资料库 PB12 2 TABLE OF CONTENTS Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、. .3 Basic Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Detailed Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Controls and their Function . .

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

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

5、. . . . . . .12 Service Bulletin JBL 2001-03 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 Service Bulletin JBL 2001-04 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Service Bulletin JBL 2001-05 . . .

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

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

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

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

10、 . . . .34 Electrical Parts List Revision 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 Printed Circuit Boards (PCB version 6.3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41 Printed Circuit Boards (PCB version 6.4) .

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

12、 . . . . .48 Power Amp Schematics (PCB version 6.0 6.3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49 Power Amp Schematics (PCB version 7.0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 Preamp Schematics (PCB version 7.2) . . . . . . . . . . . . . .

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

14、 Schematics (Revision 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54 PB12 DIFFERENCES IN REVISION 1 AND REVISION 2 REVISION 1REVISION 2 Amplifier faceplate says “Made in Canada” Amplifier serial number starts with “AM”Amplifier serial number starts with “HA” B

15、lack (or silver) potted, non-serviceable output moduleOutput transistors in the open, on a large black heatsink Large plastic 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 AMPLI

16、FIERS ARE NOT CONSIDERED INTERCHANGEABLE; THEY ARE NOT A DROP-IN REPLACEMENT IN THE CABINET OF THE OTHER VERSION. RadioFans.CN 收音机爱 好者资料库 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

17、removes the amplifier from this cabinet has been properly trained in protecting against avoidable injury and shock. Therefore, 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 volta

18、ge of the AC power source to be used. Incorrect voltage could cause damage to the amplifier when the AC power cord is 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 r

19、eturning the unit to the customer, perform a leakage or resistance test as follows: Leakage Current. Connect the unit 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

20、, the unit is defective. Reverse the polarity of the AC supply and repeat. Resistance. Measure the resistance from either 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

21、 the problem is located and corrected. Critical Components All components identified with the IEC symbol in the parts 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 i

22、n the parts list or parts with the same rating of resistance, wattage or voltage. SAFETY INFORMATION List of Safety Components 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 p

23、olarized plug, UL approved wired with the hot side to fused side. Use with factory replacement panel strain relief (70305) only. TRX042-010053-003Power Transformer. Use 80116only factory replacement. BR RECTBR1Bridge diode. Use only 50100052-400080-000factory replacement. C1,2C6,8Large electrolytic

24、filter (2200uF 100V)(3300uf 80v)caps. Be sure 30710034-470745-200replacement part is at least the same working 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

25、 volt NPE low 30718df radial. (On Power amp PCB) S64AMIDoes not applyPower output module. 60302 Use only factory replacement Faceplaten/aUse only factory 70325replacement Rear Amp Cover063-531808-000Use only factory Does not applyreplacement InductorDoes not applyCMC - Use only factory 80100replacem

26、ent InductorDoes not applyL1 - Use only factory 80121replacement Does not applyInductorL2 - Use only factory 043-300101-000replacement 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

27、 Low-Pass Frequency setting InputsLine Level (option: LFE); Speaker Level OutputsSpeaker level fixed frequency 150Hz 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 1

28、5 x 16 445mm x 381mm x 406mm Weight40 lb/18.2kg Refinements may be made on occasion to existing products without notice but will always meet or exceed original specifications unless otherwise stated. PowerBass is a registered trademark of JBL, Incorporated. 00261-1 BASIC SPECIFICATIONS PB12 Subwoofe

29、r PB12 5 JBL PB12 250W Powered Sub Amp LINE VOLTAGEYes/NoHi/Lo LineNom.UnitNotes US 120vac/60HzYes108- 132120VrmsNormal Operation EU 230vac/50- 60HzYes207- 264230VrmsNormal operation, MOMS required ParameterSpecificationUnitQA Test Limits ConditionsNotes Amp Section Type (Class AB, D, other)Dn/an/a

30、Load Impedance (speaker)5.6Ohmsn/aNominal Rated Output Power (120VAC)250Watts140Domestic version only 120 VAC- 60 Hz 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 fa

31、ctor50DF35Measured 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 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

32、 With a 5mV signal to Low level input, LED should change to GREEN -Voltage measurements (DVM) OP AMP LEDP-U4(1)P-U4(7) 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 GND

33、V-GNDGNDGNDGNDGNDGNDGNDGND Get this Reading 71.7V0V-71.7V0V-71.7V-71.5V-71.2V0V0V4.65V 4. Check Switching Frequency Oscilloscope - 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

34、off Generator Set at 200mV50Hz Signal to Line level input PB12 27 PB12 Testing Procedure (Cont.) (Revision 2 Only) - 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 upT

35、urn level, XOVER FREQ POT Fully CW and LFE switch off Set Generator at 1.3V50Hz Signal to High level input -Voltage measurements 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. S

36、ettingOutput CW14.03V CCW4.8V 4. LFE -Set upSet Generator at 200mV200Hz Signal to Line level input Measure voltage at S+ speaker output LFE switch SettingOutput Normal6V LFE18.32V See flow chart next page for diagnostics. PB12 28 PB12 Testing Procedure (Cont.) (Revision 2 Only) PB12 POWER MODULE TES

37、TING FLOW CHART CAUTION : 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 10mV signal may need from the input to trigger the Switch turn on) no no

38、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 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 L

39、ED 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 wave 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

40、,C60,C63, R81,R82 Check U7(1) = - 58.3V Check MUTE(- 12.9V), And Q24,Q25,Q26 Resistance check (no load) between V+ V- , V+ O/P,V- O/P and O/P to GND is 10K 29 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/Octav

41、e HPFLPF 12dB/Octave12dB/Octave LPF Variable SUMMI NG AMP LIMITER / LPF MUTE DC OFFSET PROTECTION THERMAL PROTECTION 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 LF

42、E 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 RevNoRevision note 67 C B Checked 8 DateSignature A PB12 30 PB12 Electrical Parts List (Revision 1 Only) PB12 POWER AMP section of PCB Version 6.3 -7.0. Part #DesignatorDescription 50100BR RECT

43、RS6046AMPBridge rectifier 50105D11N4744A15V1w Zener 50112D101N5242B12V.5w Zener 50104D111N4148Sig Diode 50112D121N5242B12V.5w Zener 50104D131N4148Sig Diode 50104D141N4148Sig Diode 50105D21N4744A15V1w Zener 50114D31N5265B62V.5w Zener 50104D41N4148Sig Diode 50113D51N4735A6.2V1W 50103D61N5234B6V.5w Zen

44、er 50104D71N4148Sig Diode 50104D81N4148Sig Diode 60157Q12N545725VN-chnl FET 60155Q102N5401120VPNP 600mA 60155Q112N5401120VPNP 600mA 60156Q122N440140VNPN 600mA 60102U1TLO64Quad OpAmp Capacitors 30710C12200uF100V+80 / -20Electrolytic 105C 30718C104u7F100VBP/NP Electr DF.1 30523C11330nF100Vmono ceramic

45、 30710C22200uF100V+80 / -20Electrolytic 105C 30532C20220nF250Vmetallized polyester 30502C21100nF50Vmono ceramic 30502C22100nF50Vmono ceramic 30527C24330nF50Vmono ceramic C25NOT USED 30508C2610nF50Vmono ceramic 30513C273n3F50Vmono ceramic 30502C3100nF50Vmono ceramic 30711C3222uF35V+80/-20Electrolytic

46、 30715C4010uF16V+80/-20Electrolytic 30716C411uF16V+80/-20Electrolytic 30717C42100uF16V+80/-20Electrolytic 30502C6100nF50Vmono ceramic 30521C7A100nF250Vceramic/film 30521C7B100nF250Vceramic/film CWNOT USED 30505CZ100nF100Vceramic/film PB12 31 PB12 Electrical Parts List (Revision 1 Only) PB12 POWER AM

47、P section of PCB Version 6.3 -7.0. Part #DesignatorDescription Resistors R100NOT USED 40105R10A0.1R.5Wmetal 40105R10B0.1R.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 40722R266k8.25Wcarbon 40738R2710k2Wmetal 40739R281k20.25Wcarbon 40