JBL PowerBass PB12 Service Manual Download Page 40 | Manualshive

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Summary of Contents for PowerBass PB12

Page 1: ...JBL Incorporated 250 Crossways Park Dr Woodbury New York 11797 REV2 10 2001 PowerBassTM Series PB12Subwoofer SERVICE MANUAL ...

Page 2: ...Exploded and Packaging 16 Amplifier Exploded View 17 Amplifier Faceplate 18 Integrated Circuit Diagrams 19 Testing Procedure 20 Electrical Parts List PCB version 6 3 7 0 23 Electrical Parts List PCB version 7 2 28 Printed Circuit Boards PCB version 6 3 7 0 32 Printed Circuit Boards PCB version 6 4 35 Printed Circuit Boards PCB version 7 2 36 Schematics Preamp PCB version 6 3 7 0 39 Power Amp PCB v...

Page 3: ...PB12 3 SAFETY INFORMATION ...

Page 4: ...PB12 4 BASIC SPECIFICATIONS PB12 Subwoofer ...

Page 5: ...PB12 5 DETAILED SPECIFICATIONS PB12 Subwoofer ...

Page 6: ... but switch to LFE when playing Dolby DigitaL DTS or other digital surround modes see page 9 4 Phase Switch Changes the subwoofer s output to be in phase or 180 degrees out of phase with the program material 5 Crossover Frequency Sets the highest frequency the subwoofer will reproduce 6 Line Input Main Input connection to subwoofer preferred 7 Speaker In Jacks Main Input connection to subwoofer wh...

Page 7: ...s in the center of the collars are intended for banana type connectors Dolby Pro Logic Non Digital Speaker Level Use this installation method for Dolby Pro Logic applications not Dolby Digital DTS or other digital processing where the receiver processor does not have a subwoofer output or a volume controlled preamp line level output Connect your receiver or amplifier s front left and right speaker...

Page 8: ...e LFE position with Dolby Pro Logic only processors Note If your receiver or amplifier only has one subwoofer output jack then you may connect the subwoofer output on your receiver preamplifier to either the left or right line level input on the subwoofer It makes no difference which jack you choose Connect each speaker to the corresponding speaker terminals on your receiver or amplifier Make sure...

Page 9: ...f your receiver or amplifier only has one subwoofer output jack then you may connect the subwoofer output on your receiver preamplifier to either the left or right line level input on the subwoofer It makes no difference which jack you choose Connect each speaker to the corresponding speaker terminals on your receiver or amplifier Make sure that you have configured your surround sound processor fo...

Page 10: ...bwoofer placement type of main speakers and listener position Adjust the subwoofer level so that the volume of the bass information is pleasing to you Crossover Adjustments The Crossover Frequency Control determines the highest frequency at which the subwoofer reproduces sounds If your main speakers can comfortably reproduce some low frequency sounds set this control to a lower frequency setting b...

Page 11: ...een receiver amplifier and speakers Make sure all wires are connected Make sure none of the speaker wires are frayed cut or punctured Review proper operation of your receiver amplifier If there is low or no bass output Make sure the connections to the left and right Speaker Inputs have the correct polarity and Make sure that the subwoofer is plugged into an active electrical outlet and PB12 only s...

Page 12: ...turn VOLUME control fully counterclockwise disconnect RCA cables 6 Connect one pair of speaker cables to either high level input terminal on UUT Cables should be connected to an integrated amplifier fed by the signal generator 7 Turn on generator and adjust so that speaker level output is 1 0V 50 Hz Turn VOLUME control full clockwise 8 Green LED should light immediate bass response should be heard...

Page 13: ...switch to standby mode even when the audio signal is removed indicated by the subwoofer s green LED s remaining on perform the following modification 1 Set the unit on a padded surface and remove all external cables 2 On the amplifier faceplate remove the 10 Phillips mounting screws around the perimeter 3 Remove the amplifier assembly from the enclosure If the amp is turned and supported correctly...

Page 14: ...0uH may be damaged Check and Replace L1 if necessary 1 Set the unit on a padded surface and remove all external cables 2 On the amplifier faceplate remove the 10 Phillips mounting screws around the perimeter 3 Remove the amplifier assembly from the enclosure If the amp is supported correctly no other connectors need to be unplugged 4 Locate Inductor L1 on the main PCB If the windings appear charre...

Page 15: ...eason check for the presence of diode D4 on the Main PCB close to the Power Amp Module see illustration If D4 is missing or has been cut out of the circuit it should be replaced add JBL part 50115 Observe polarity Note The presence or absence of D4 in itself does not contribute to or solve an amplifer failure Purpose of D4 is to reduce the possibility of an occasional Turn OFF pop noise Reference ...

Page 16: ...23 6 7 8 MECHANICAL PACKING PARTS LIST 1 12 Woofer 203500 2 Foot 203410 3 Outer Carton 203520 4 Owner s Manual 120V 203430 5 Amplifier Complete Not For Sale 6 Foot Screw 203411 Foam corners package drawing 7 Top Corner 4 carton 203460 8 Bottom Corner 4 carton 203470 ...

Page 17: ...fier Exploded View 00263 1 2 5 6 3 4 7 LEGEND 1 Dual RCA jack 108320 2 Power Transformer 80116 3 Level Pot 40402 4 Crossover CONTROL 40707 5 Fuse Clips 2 70323 6 2A SloBlo T Type Fuse 3AG 80117 7 Power Switch 70151 ...

Page 18: ...UT R 00264 120V 60 Hz 180W JBL INC NORTHRIDGE CA USA Made In Canada CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN R LR 110113 NRTL C CSA 22 2 UL 1490 ON POWER OFF LEVEL KNOB 70313 PHASE SWITCH 70150 LFE DEFEAT SWITCH 70150 CROSSOVER FREQUENCY KNOB 70313 PB12 FACEPLATE 70325 HI LEVEL I O IN 108116 HI LEVEL I O OUT 108116 STRAIN RELIEF 70305 POWER CORD 80105 POWER SWITCH 70151 ...

Page 19: ...dent marker on main PCB alternately observe position of label on top of the module incorrectly replacing the Module 180 in the PCB slot will result in its destruction 2 All AC powered test instruments meters oscilloscopes etc must have a floating ground i e be connected to an isolation transformer 3 Align and position the Amp Module before soldering 4 Attach the amp Module with the mounting screws...

Page 20: ...PB12 20 Testing Procedure ...

Page 21: ...PB12 21 Integrated Circuit Diagrams Cont ...

Page 22: ...PB12 22 Integrated Circuit Diagrams Cont ...

Page 23: ...PB12 23 PB12 Electrical Parts List PB12 POWER AMP PCB Version 6 3 7 0 Part Designator Description ...

Page 24: ...PB12 24 PB12 Electrical Parts List Cont PB12 POWER AMP section of PCB Version 6 3 7 0 Part Designator Description ...

Page 25: ...PB12 25 PB12 Electrical Parts List Cont PB12 POWER AMP section of PCB Version 6 3 7 0 Part Designator Description ...

Page 26: ...PB12 26 PB12 Electrical Parts List Cont PB12 PREAMP section of PCB Version 6 3 7 0 Part Designator Description ...

Page 27: ...PB12 27 PB12 Electrical Parts List Cont PB12 PREAMP section of PCB Version 6 3 7 0 Part Designator Description ...

Page 28: ...tal 40105 R10B 0 1 ohms 5W 5 metal 40105 R10C 0 1 ohms 5W 5 metal 40420 R11 1k 25W 5 carbon 40420 R12 1k 25W 5 carbon 40417 R13 47k 25W 5 carbon 40718 R14 3k3 25W 5 carbon R15 NOT USED 40405 R21 4K7 25W 5 carbon 40736 R22 42K2 25W 1 metal 40737 R23 187k 25W 1 metal R24 NOT USED R25 NOT USED 40722 R26 6k8 25W 5 carbon 40738 R27 10k 2W 5 metal SAFETY 40739 R28 1k2 0 25W 5 carbon 40739 R29 1k2 0 25W ...

Page 29: ...rolytic 30716 C41 1uF 16V 80 20 Electrolytic 30717 C42 100uF 16V 80 20 Electrolytic CW NOT USED 30505 CZ 100nF 100V 20 ceramic film Semiconductors 50105 D1 1N4744A 15V 1w Zener 50105 D2 1N4744A 15V 1w Zener 50114 D3 1N5265B 62V 5w Zener 50115 D4 1N4938 5 Sig Diode EDN 10025 changes D4 on poweramp section from 1N4148 to 1N4938 part 50115 June 26 50113 D5 1N4735A 6 2V 1W 50103 D6 1N5234B 6V 5w Zener...

Page 30: ...5 carbon 40405 R2 4k7 25W 5 carbon 40406 R3 100k 25W 5 carbon 40406 R4 100k 25W 5 carbon 40406 R5 100k 25W 5 carbon 40406 R6 100k 25W 5 carbon 40717 R8 2k7 25W 5 carbon 40717 R9 2k7 25W 5 carbon 40409 R10 10k 25W 5 carbon 40731 R11 59k 25W 5 carbon 40504 R12 45k3 25W 1 metal 40412 R13 33k2 25W 1 metal 40709 R14 68k1 25W 1 metal R15 NOT USED R16 NOT USED 40732 R17 56k2 25W 1 metal 40722 R18 6k8 25W...

Page 31: ...mono ceramic 30100 C19 330pF 50V 20 mono ceramic 30502 C20 100nF 50V 20 mono ceramic 30502 C21 100nF 50V 20 mono ceramic 30502 C22 100nF 50V 20 mono ceramic 30502 C23 100nF 50V 20 mono ceramic C30 NOT USED Semiconductors 50104 D50 1N4148 5 Sig Diode 50104 D51 1N4148 5 Sig Diode 50104 D52 1N4148 5 Sig Diode 50104 D53 1N4148 5 Sig Diode 50104 D54 1N4148 5 Sig Diode 50104 D55 1N4148 5 Sig Diode 60102...

Page 32: ...PB12 32 PB12 PCB s version 6 3 ...

Page 33: ...PB12 33 PCB s version 6 3 Cont ...

Page 34: ...PB12 34 PCB s version 6 3 Cont ...

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Page 41: ...CMC 2m2H C7A 100nF C7B 100nF R2B 7k5 C1 2200uF C2 2200uF 9 8 10 R8A 10k R8B 10k R1B 7k5 R1C 7k5 R2C 7k5 R2A 7k5 12 13 14 R27 10k 4 11 R7A 10k 15V GND GND SIG 15V mute 2 3 1 5 6 7 R21 4K7 R42 22k D7 1N4148 D8 1N4148 D10 1N5242B R50 2k2 R100 NOT USED 4 11 4 11 To U1 Pin 4 To U1 Pin 11 SHORT CIRCUIT PROTECT SIGNAL LED AUTO MUTE To From PREAMP D4 1N4938 R4 33k UVLO 15 15 R24 NOT USED R25 NOT USED CONN...

Page 42: ... 2 3 1 R18 6k8 R20 6k8 U1 U2 C10 100nF C12 100nF C13 100nF C11 100nF R21 0r R19 6k8 R22 6k8 R23 0r LoPass Defeat Sw SW SPDT 13 12 14 13 14 12 3 2 1 7 6 5 6 5 7 8 10 9 1 3 2 1 2 3 1 2 3 4 5 6 7 8 9 11 12 10 R1 4k7 R2 4k7 15V 15V C21 100nF C20 100nF C23 100nF C22 100nF 15V GND GND SIG 15V mute To From PWRAMP R25 33k2 3rd Order Hi Pass 2nd Order LO PASS 2nd Order LO PASS GAIN STAGE RCA CONNECTOR DUAL...

Page 43: ...A 10k 15V GND GND SIG 15V mute 2 3 1 5 6 7 R21 4K7 R42 22k D7 1N4148 D8 1N4148 D10 1N5242B R50 2k2 4 11 4 11 To U1 Pin 4 To U1 Pin 11 SHORT CIRCUIT PROTECT SIGNAL LED AUTO MUTE To From PREAMP D4 1N4938 R4 33k UVLO 15 15 R24 NOT USED R25 NOT USED CONNECTOR C24 330nF C25 NOT USED R7C 10k R9 NOT USED 1 2 3 AV SW NOT USED 6V V V 15V S D FR I P GND 15V O P MODULE S64 D5 1N4735A SPK 1 QUICK FIT TERMINAL...

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