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JBL PowerBass PB12 Service Manual

Other manuals for PowerBass PB12: Owner's Manual, Service Manual, Service Manual
Manual is about: PowerBass Series Powered Subwoofer

Summary of PowerBass PB12

  • Page 1

    Powerbass ™ series pb12 powered subwoofer service manual jbl consumer products 250 crossways park dr. Woodbury, new york 11797 rev10 2/2004.

  • Page 2

    Pb12 table of contents safety information ………………………………………………….……….3 basic specifications ……………………………..………………………….4 detailed specifications ……………………………………….…………….5 controls and their function………….……..……………………………….6 connections …………………….……………………………………………7 operation ……………………………………………………………………10 trouble...

  • Page 3: Safety Information

    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. Therefore, any service...

  • Page 4

    Pb12 4 output power 250 watts rms driver 12" woofer frequency response 25hz – low-pass frequency setting inputs line level (option: lfe); speaker level outputs speaker level fixed frequency 150hz low-pass frequency variable from 50hz – 150hz high-pass frequency 150hz when using speaker level output ...

  • Page 5

    Pb12 5 jbl pb12 250w powered sub amp line voltage yes/no hi/lo line nom. Unit notes us 120vac/60hz yes 108-132 120 vrms normal operation eu 230vac/50-60hz yes 207-264 230 vrms normal operation, moms required parameter specification unit qa test limits conditions notes amp section type (class ab, d, ...

  • Page 6: Rear Panel

    Pb12 6 pb12 subwoofer controls and their function 1. Power - these lights will be red when the unit is plugged in and not receiving a signal; when the pb12 receives a signal, the lights will cycle to green. If no signal is received after 10-15 minutes the lights will cycle back to red (standby) unti...

  • Page 7: Speaker Connection

    Pb12 7 speaker connection when we designed the pb12 powered subwoofers, our goal was to offer the user the best possible performance combined with the most flexible and complete installation options. Please look over the following three examples to determine which description best matches your syste...

  • Page 8

    Pb12 8 dolby pro logic (non-digital) – line level use this installation method for dolby pro logic applications (not dolby digital, dts or other digital processing), where the receiver/processor is equipped with a subwoofer output or a volume-controlled preamp (line-) level output: use rca-type patc...

  • Page 9

    Pb12 9 dolby digital or dts (or other digital surround mode) connection use this installation method for dolby digital, dts or other digital surround processors: important: make sure that the lfe toggle switch on the subwoofer is in the “lfe” position. Use the line-level input jacks for the low- fre...

  • Page 10: Operation

    Pb12 10 operation power when the unit is plugged in and the power switch is on and no signal is received, the leds on the front of the unit will turn red. When a signal is present, the leds will turn green. Note: it will take several minutes for the leds to turn from green to red after the input sig...

  • Page 11: Phase Control

    Pb12 11 phase control the phase control determines whether the subwoofer’s piston-like action moves in and out in phase with the main speakers or opposite the main speakers. There is no correct or incorrect setting. Proper phase adjustment depends on several variables such as subwoofer placement and...

  • Page 12

    Pb12 12 pb12 test setup and procedure min max level 50 hz 150 hz lfe normal phase 180 0 crossover frequ ency li n e level i n l r for lfe use l or r l high livel in r l high livel out r 00229 cd player pre amp amplifier ac volt meter (6v) line level pb12 under test speaker level from line-level sour...

  • Page 13: Service Bulletin

    Pb12 13 service bulletin service bulletin jbl2001-03 rev1 – january 2002 this is considered a minor repair to: all jbl service centers models: pb10, pb12 (revision 1 only)* subject: unit will not switch to standby mode when the power cord of the pb series subwoofer is plugged into a wall outlet (and...

  • Page 14: Service Bulletin

    Jbl incorporated 250 crossways park dr. Woodbury, new york 11797 (516) 496-3400 service bulletin service bulletin jbl2001-04 rev2 – february 2003 this is considered a minor repair to: all jbl service centers models: pb10, pb12 (revision 1 only)* subject: hum, buzz or “thumping” in the event you rece...

  • Page 15: Pb10/12 Revision 1 Only

    Jbl incorporated 250 crossways park dr. Woodbury, new york 11797 (516) 496-3400 pb10/12 revision 1 only model serial number (120v) serial numbers are located on the cabinet directly below the amplifier faceplate. Status action pb10 see serial numbers on page 3 for factory modified units hum, buzz or...

  • Page 16

    Jbl incorporated 250 crossways park dr. Woodbury, new york 11797 (516) 496-3400 factory modified pb-10 serial numbers 1953 23000 7720 23896 8579 23904-23905 10145 23989 10448 23991 10458 23993 11772 23997 11792 24004 11939 24010 13128 24166 13296 24230 14371 24874-24875 14508 24888 14510 24902 14519...

  • Page 17: Service Bulletin

    17 service bulletin service bulletin jbl2001-05 rev2 - february 2002 this is considered a minor repair to: all jbl service centers models: pb12 (revision 1 only)* subject: popping every few seconds during play in the event you receive a pb12 subwoofer with the complaint: “the subwoofer “thumps” or “...

  • Page 18: Service Bulletin

    Pb12 18 service bulletin service bulletin jbl2001-07 rev1 - february 2002 this is considered a minor repair to: all jbl service centers model: pb12 (revision 1 only)* subject: possible missing diode d4 in the event you receive a pb12 subwoofer for any servicing reason, check for the presence of diod...

  • Page 19: Service Bulletin

    Service bulletin service bulletin jbl2003-08 – july 2003 this is considered a minor repair to: all jbl service centers models: pb12 (revision 2, pcb revision “c” or “d” only) * subject: service modification – l5 bypass in the event you receive a pb12 subwoofer for servicing, the following modificati...

  • Page 20

    Tech tips troubleshooting tips and solutions to common service problems for models: pb10, pb12 (revision 2) * tip# jbltt2003-04 subject: replacing mosfets q18, q22 in the event you need to replace mosfet transistors q18 or q22 as part of a repair, it is important to use only the jbl part# fe10640111...

  • Page 21: Exploded and Packaging Views

    Pb12 21 exploded and packaging views (image reduced) 1 5 9 4 2 6 7 8 3 mechanical & packing parts list item # description qty revision 1 part# revision 2 part# 1 12" woofer (dcr = 4.8 Ω) 1 203500 338128-001 2 foot 4 203410 336486-001 3 outer carton 1 203420 338131-001 4 owner’s manual 120v 1 203430 ...

  • Page 22

    Pb12 22 amplifier exploded view (revision 1 only) 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 slo-blo t typefuse (3ag) 80117 7 power switch 70151.

  • Page 23: Amplifier Faceplate/access

    Pb12 23 amplifier faceplate/access crossover frequency level line level in phase min max l r l r for lfe use l or r lfe normal powerbass pb12 remove these two screws to remove rear cover and access amplifier longer screw here powerbass pb12 high level in l r power high level out + – 120v 60hz 50hz 0...

  • Page 24

    Pb12 24 integrated circuit diagrams (revision 1 only) lm324, tlo64, u1, u2 2 base 3 collector 1 emitter 1 2 3 mpsa56, q10, q11 2 base 3 collector 1 emitter 1 2 3 2n4401, q12 0 0227 d s g n-chan jfet q1 2n5457 +6v 15 16 17 v+ 1 +6v 2 v+ 3 18 4 o/p 19 5 o/p 20 6 v- v- 21 7 22 8 sd 24 +15v 23 9 +15v 10...

  • Page 25

    Pb12 22 integrated circuit diagrams (revision 2 only) opamp, quad tl074cdr u2, 3 opamp, dual tl072cdr so-8, njm4558m-te3 u5, 6, 4 ir2111 half-bridge driver u7 2 base 3 collector 1 emitter 1 2 3 2n5401 q1 2 base 3 collector 1 emitter 1 2 3 mpsw06rlra, mpsw56rlrampq, mps2222arlra, 2n2907a, 2n5551, q2,...

  • Page 26

    Pb12 26 pb12 testing procedure (revision 1 only).

  • Page 27

    Pb12 27 pb12 testing procedure (cont.) (revision 1 only).

  • Page 28

    Pb12 28 pb12 testing procedure (cont.) (revision 1 only).

  • Page 29

    Pb12 29 pb12 testing procedure (cont.) (revision 2 only) a. Power amp section resistance check resistance from s+ (spk o/p) to gnd should be >1m Ω (no load) resistance from v+ (c6 p+) to v- (c8 p-) gradually fully charged should read >10k Ω resistance from v+ (c6 p+) to s+ (spk o/p) should read >1m ...

  • Page 30

    Pb12 30 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 306.9mv 461mv 460mv 658mv 628mv 598mv 2.326v 2.02v 3.57v 23.33v 2. High level input sensitivity -set up turn level, x’over freq pot fully cw and ...

  • Page 31

    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 instruments connected to the output must be floating. Attach the scope probe tip to s - and reference lead to s+...

  • Page 32

    32 pb12 block diagram revision 2 only rin lin rout lout line level input dif. Amp summi ng amp volume ctrl phase ctrl switch amp stage 12db/octave hpf lpf 12db/octave 12db/octave lpf variable summi ng amp limiter / lpf mute dc offset protection thermal protection current protection linear power supp...

  • Page 33

    Pb12 33 pb12 electrical parts list (revision 1 only) pb12 power amp section of pcb version 6.3 -7.0. Part # designator description 50100 br rect rs604 6amp bridge rectifier 50105 d1 1n4744a 15v 1w zener 50112 d10 1n5242b 12v .5w zener 50104 d11 1n4148 sig diode 50112 d12 1n5242b 12v .5w zener 50104 ...

  • Page 34

    Pb12 34 pb12 electrical parts list (revision 1 only) pb12 power amp section of pcb version 6.3 -7.0. Part # designator description resistors r100 not used 40105 r10a 0.1r .5w metal 40105 r10b 0.1r .5w metal 40105 r10c 0.1r .5w metal 40420 r11 1k .25w carbon 40420 r12 1k .25w carbon 40417 r13 47k .25...

  • Page 35

    Pb12 35 pb12 electrical parts list (revision 1 only) pb12 power amp section of pcb version 6.3 -7.0. Part # designator description miscellaneous 80121 l1 220uh 5 amp gapped ecore choke 80122 l2 8u5h 5 amp ferrite bead 80122 l3 8u5h 5 amp ferrite bead 80122 l4 8u5h 5 amp ferrite bead 80100 cmc 2m2h 5...

  • Page 36

    Pb12 36 pb12 electrical parts list (revision 1 only) pb12 power amp section of pcb version 6.3 -7.0. Part # designator description resistors 40405 r1 4k7 .25w carbon 40409 r10 10k .25w carbon 40731 r11 59k .25w carbon 40504 r12 45k3 .25w metal 40412 r13 33k2 .25w metal 40709 r14 68k1 .25w metal r15 ...

  • Page 37

    Pb12 37 pb12 electrical parts list (cont.) (revision 1 only) pb12 power amp section of pcb version 7.2. Part # designator description resistors 40735 r1a 7k5 2w 5% metal safety 40735 r1b 7k5 2w 5% metal safety 40735 r1c 7k5 2w 5% metal safety 40735 r2a 7k5 2w 5% metal safety 40735 r2b 7k5 2w 5% meta...

  • Page 38

    Pb12 38 pb12 electrical parts list (cont.) pb12 power amp section of pcb version 7.2. Part # designator description capacitors 30710 c1 2200uf 100v +80/-20 electrolytic 105c safety 30710 c2 2200uf 100v +80/-20 electrolytic 105c safety 30502 c3 100nf 50v 20% mono ceramic 30502 6 100nf 50v 20% mono ce...

  • Page 39

    Pb12 39 pb12 electrical parts list (cont.) pb12 preamp section of pcb version 7.2. Part # designator description 80122 l3 8u5h 5 amp 5% ferrite bead 80122 l4 8u5h 5 amp 5% ferrite bead 80138 cmc 3m6h 5 amp choke safety 70322 led 3 molex 2 header male connector 108326 led harness molex 2 socket glued...

  • Page 40

    Pb12 40 pb12 electrical parts list (cont.) pb12 preamp section of pcb version 7.2. Part # designator description capacitors film caps may be used in any position except c1, c2 30707 c1 200uf 50v 20% bp electrolytic 30707 c2 200uf 50v 20% bp electrolytic 30101 c3 220pf 50v 20% mono ceramic 30101 c4 2...

  • Page 41: Revision 2 Only

    Pb12 41 pb12 electrical parts list (cont.) revision 2 only part number description qty reference designators resistors 020-220497-120 film resistor 2k2 1/4w j 1 r11 021-100401-120 mof resistor 1k 1w j 1 r103 021-120403-020 mof resistor 1k2 3ws j 1 r9 021-120405-020 mof resistor 1k2 5ws j 1 r6 022-50...

  • Page 42: Revision 2 Only

    Pb12 42 pb12 electrical parts list (cont.) revision 2 only part number description qty reference designators capacitors 031-100244-100 smd ceramic capacitor 0u01/50v k 7 c33, 45, 51, 66, 67, 5, 10 031-100343-100 smd capacitor 100pf/50v j 3 c16, 36, 58 031-100344-100 smd capacitor 0u1/50v k 16 c11, 4...

  • Page 43: Revision 2 Only

    Pb12 43 pb12 electrical parts list (cont.) revision 2 only part number description qty reference designators miscellaneous 041-115001-000 bead coil yt-10911 1 l5 043-300101-000 inductor 30uh yt-10033 1 l2 043-324300-000 inductor 324uh yt-10778 1 043-560200-000 inductor 56uh yt-10779 1 043-700101-000...

  • Page 44

    44 pb12 (pcb version 6.3) (revision 1 only).

  • Page 45

    45 pb12 (pcb version 6.3) (cont.) (revision 1 only).

  • Page 46

    46 pb12 (pcb version 6.3) (cont.) (revision 1 only).

  • Page 47: Pb10

    H:\brands\jbl\pb10-12ewrev\vers64 (current screen) scale=0.46 wed oct 24 10:52:35 2001 pb10 pb12 (pcb version 6.4) power amp only (revision 1 only).

  • Page 48

    H:\brands\jbl\pb10-12\pb10newrev\vers72 (current screen) scale=0.45 tue oct 23 10:20:58 2001 pb12 (pcb version 7.2) (revision 1 only).

  • Page 49

    H:\brands\jbl\pb10-12\pb10newrev\vers72 (current screen) scale=0.45 tue oct 23 10:20:58 2001 pb12 (pcb version 7.2) (revision 1 only).

  • Page 50

    H:\brands\jbl\pb10-12\pb10newrev\vers72 (current screen) scale=0.45 tue oct 23 10:20:58 2001 pb12 (pcb version 7.2) (revision 1 only).

  • Page 53

    53 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 a b c d e f g h i 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 i h g f e d c b a part no: date: drawn: rev. Version 7.0 (pwramp) 14-feb-2001 ms/ll 1 sheet: 2 of 2 1 2 3 4 5 6 un-designated connector not used br rect rs604 r40 1k r41 1000k u1 tlo64 c41 1uf d12 1n5242b d1...

  • Page 54

    54 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 a b c d e f g h i 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 i h g f e d c b a part no: date: drawn: rev. Revision 7.2 (preamp) 25-oct-2001 ms/ll 1 sheet: 1 of 2 6 5 4 3 2 1 conn 1 not used u1 u2 u1 tlo64 u1 r16 not used c9 1k c8 0r c7 0r r15 not used r17 56k2 r14 68k...

  • Page 55

    55 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 a b c d e f g h i 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 i h g f e d c b a part no: date: drawn: rev. Revision 7.2 (pwramp) 25-oct-2001 ms/ll 1 sheet: 2 of 2 6 5 4 3 2 1 conn 2 not used diode bridge rs604 r40 1k r41 1000k u1 tlo64 c41 1uf d12 1n5242b d14 1n4148 c4...

  • Page 56

    56 pb12 revision 2 schematic diagrams preamp.

  • Page 57

    57 pb12 revision 2 schematic diagrams power amp.