SERVICE MANUAL - Schematics Forum
Contents
1. 7 8 9 10 12 E 14 15 LEDI 2 Preamp gt Preamp gt R46 R45 1000k SIGNAL LED amp AUTO MUTE 5 Not Connected V LED LED Harness R100 4 1064 sN 2 a Ul 71 3 3 Un designated Connector NOD USED j Ul 11 064 DB Zz MOLEX 2 MOLEX 2 On Harness Harness amp To Ul Pin 11 11 1N4148 aro 15V 6 o 5 C40 cal X R47 5 5 me s ani R40 R41 10k K yH GND 4 lt 1000k Rao x amp GND 3 lk 1000k 1452428 gt R42 R44 Ans 2CirCED 2 sc 2 10uF 23 100k Q1 1 99 3 R48 amp R49 changed to 4k7 O bi 7 NOT USED 25549 R21 4K7 4 1 1 SHORT CIRCUIT PROTECT C25 RTA R7BO RIC C6 pg RI3 R2 jenn USED 77 Ts 47R 1 1 Loong INS234B 47k 3k3 42 2 S64 CONNECTOR 1 ji X 1 A 2N5401 AVSW D5 1 4735 00 Ln 254401 1 R26 IN4148 255401 3 7 R27 1452658 jl ik 4 e V il 4 4 NOT USED 10k 1 OUS dons lt RIOB lt RIOC R28 __ 54 RIA SRIB2. OP AMP SPEAKER Ut 7 U2 7 Ut 1 U2 1 Ut 14 U2 14 U2 8 OUTPUT 354mV 529mV 520mv 736mv 699 661mV 1 40 26 7V 2 High Level Input Sensitivity Setup level Lo Pass Pot Fully CW and LFE switch off Set Generator at 2 0V 9 50Hz Signal to High level input Voltage measurements 24 5V at speaker output 3 Low Pass Set up Set Generator at 200mV 100Hz Signal to Low level input Measure voltage at speaker output Voltage measurement Low Pass Pot Settin Output CW 16 1V CCW 4 60V 4 LFE Set up Set Generator at 200mV 200Hz Signal to Low level input Measure voltage at speaker output Voltage measurement LFE Switch Setting Output OFF 702 2 8 401 8 See flow chart next page for diagnostics 21 PB12 Integrated Circuit Diagrams Cont PB12 POWER MODULE TESTING FLOW CHART CAUTION MODULE 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 SPK and REFERENCE LEAD TO START Resistance check no load between V V V O P V and O P to GND is gt 10K Replace Module yes Power up with no signalinput LED RED no Check fuse transformer CMC rectifier yes and C2 Check input of module wrt GND 0V D C Check C32 and Pre AMP Use scope to check switching frequency from
3. SPK 1 QE 578 576 e 4 4 1 R25 R29 8M2 QUICK FIT TERMINAL 4 R4 NOT USED xx cio eu 5 33 4u7F R31 Be K R30 TT 330nF 4 4 4 12 SPK2 IN4148 4 A 4 R32 2 SH RIS CW QUICKHT TERMINAL 4 x NOT USED 100nF R9 4 4 4 NOT USED I lt 7 i TE RS C21 In 3 56k2 100nF 4 D2 3AG FUSE On Faceplate Gir lt MCI 4632 TRANS PRI 2A SloBlo LIVE SW SPST 2 ds TRX 15 To AC Feed lt o LP gt To Power Cord 1 FEND QUICK FIT TERMINAL QUICK FIT TERMINAL iN4J44A MODULE ACRetum lt gt To Power Cord TRANSFORMER IS MOUNTED ON FACEPLATE 4 AC Feed CA O QUICK FIT TERMINAL GND R2A QRXC L O QUICK FIT TERMINAL 745 785 745 AC Return cl 4 4 QUICK FIT TERMINAL 2200 R8B 10k 10k 2200uF Part No Version 7 0 PWRAMP 41 Dat 14 2001 Drawn Rev Sheet 5 of 2 2 3 4 5 6 7 8 10 12 13 14 15 Pre Amp PCB version 7 2 R27 3rd Order Hi Pass R14 16 DUAL RCA 604r NOT USED RIn R28 3312 REMOTE C18 330pF 3 c C8 GND EZ C19 330pF Phase Switch 0 NOT USED r Or Lin R13 RIS NOT USED RCA CONNECTOR 1N4148 1N4148
4. 1N4148 1N4148 B POST I O 2nd Order LO PASS 2nd Order Hi Pass LO PASS CONTROL 1 20k POT C10 R18 150nF 100nF 1N4148 154148 200uF AKT RS T LO PASS CONTROL 2 2k7 120k 100nF 100nF 100nF 100nF 100nF a 2nd Order LO PASS o LA a LED2 jaa LoPass Defeat Sw 1 SW SPDT Be 2 lt 5 R26 GAIN STAGE NOT USED 9 To Pin 11 01 02 CONN C30 100nF NOT USED WA 15V 6 4 GND 3 GND zu NOT USED 2 SIG 15V 0 4 82 15V 1 15 LEDI gt To Pin 4 U1 U2 NOT USED lt A 1 2 From PwrAmp e USED To From PVRAMP Part No Revision 7 2 PREAMP Date 55 Oct 2001 4 2 Drawn MS LL Rev 1 Sheet 1 of 2 2 3 4 5 6 7 8 9 10 12 13 14 1 2 3 4 5 6 7 8 9 10 12 13 14 15 Power Amp PCB version 7 2 LEDIA Pump gt A uio LEDI 2 Preamp gt SIGNAL LED amp AUTO MUTE R45 1000k Not Used LED3 LED Harness 15 om 1N4148 R50 D14 2224 Ix gt 1 m Molex2 Molex 2 2k2 Not Used 1 On Harness Harness e CONN A T
5. QI T JR ii gt 812 ya CONNECTOR d k 285401 AVSW Tk D 95 1N 735A 910 34148 NGA A 4 ji E 2N5401 D7 INS265B ik M HH NOT USED RIDA SR Lis 4 tios 0 10B amp RIOC R2R 018 015 OR RIC 14 14 ik NOT USED zi SENGE 25 SM2 SuSH CE NOT USED R3 wane aT 100mF E 4 47k L2 TA IN4148 OE th 52 220uH RIS susH cw es Em NOT USED id m 4 m s 1002F AED 32 Y s 4 4 4 R3 gui NOT USED zi 10k 2367 11064 2218 5 RS M Cu Di 3 5 2 i C26 i00nF a 1018 n 022 E 100nF 7 MODULE En ii On Faceplate On Faceplate ve o So CURES ie SW SPST aul v 2A SlcBlo RS604 Title 10k B12 PwrAmp 6 0 PCB 2206uF e z Size Number Revision 2200 D i 5 Date 20 Apr 2000 Sheet Tof 1 I 3 File TAPB12 sch Folder PB12 5 5 Drawn MA LL 40
6. 7 Test the unit and confirm the original problem has been corrected TD C24 uz i R28 B cnc T ues Ej 5 2 R26 C21 NU J3 L Roc NR 52 t O28 x L4 e R10B R44 R31 9 R45 R32 bia Ea m 011 gt D C20 DIODE BRIDGE E R43 Be yA a ca po paz ce 5 ss li EN 53 id RBA AC 2 C40 AA T PWRAMP __ nza nzo R27 MODULE AMI 2000 1 las Version 6 9 L1 JBL Incorporated 250 Crossways Park Dr Woodbury New York 11797 14 JBL Service Bulletin Service Bulletin JBL2001 07 November 2001 This is considered a Minor repair To All JBL Service Centers Model PB12 Subject Possible Missing Diode D4 In the event you receive a PB12 subwoofer for any servicing reason 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 oC SS ES 4 R30 AZA R7B R7C R27 MODULE Reference for general location only all parts or designators may not conform exactly to this drawing JBL Incorpor
7. 132 120 Vrms Normal Operation Vrms Normal operation MOMS required Parameter Amp Section QA Test Specification Unit Limits Conditions Notes Type Class AB D other Load Impedance speaker Rated Output Power THD Rated Power CE 56 Ohms Nominal 102 250 Watts 145 1 input driven Peak THD Q 1 Watt DC Offset 0 3 96 22k filter 145 Watts 0 1 Yo 22k filter Speaker Outputs Input Sensitivity Measured at the speaker cable 150 Watts o Input L amp R LFE input Speaker Hi Level Input SNR A Weighted a 777777240 2298 150 Watts Single input driven To 150 Watts Single input driven LFE switch ON S To 150 Watts Single input driven SNR unweighted SNR rel 1W unweighted Residual Noise Floor Residual Noise Floor Input Impedance 90 dBA 80 relative to rated power A Weighting filter 85 dBr 80 relative to rated power 22k filter 89 relative to 1W Output 22k iler mVrms 2 Volume max using RMS reading DMM VOM or A P BW 20 Khz Volume max w A P Swept Bandpass Measurement Line 1 5imVrms max freq harmonics BW 20 Khz Line Input L Speaker Hi Level l utj Filters LP filter 4th order fixed LFE Low pass 2nd order HP speaker out connector Limiter THD at Max Output Power Features Volume pot Taper lin log 60 180
8. 33k TW meta 40420 R40 1k 25W carbon 40701 R41 1000k 25W carbon 40741 R42 22k 5W meta 40701 R43 1000k 25W carbon 40406 R44 100k 25W carbon 40415 R45 470K 25W carbon 40701 R46 1000k 25W carbon 40409 R47 10k 25W carbon 40409 R48 10k 25W carbon 40726 R49 15k 25W carbon 40732 R5 56k2 25W metal 40727 R50 2k2 25W carbon 40111 R6 47R 28W carbon 3 40738 10 2W metal gt 24 PB12 PB12 Electrical Parts List Cont PB12 POWER section of PCB Version 6 3 7 0 Part Designator Description 40738 R7B 10k 2W metal 40738 R7C 10k 2W metal 40738 R8A 10k 2W metal 40738 R8B 10k 2W metal R9 NOT USED 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 Amp choke 60302 MODULE S64AMI 108326 Led Harness With two LED s M Glued into cabinet 80116 Transformer 4632 100VA 4632 transformer 70151 Switch SW SPST Power Switch 70322 LED socket PCB mount LED socket 80117 FUSE 2A SloBlo T type 70324 0 187 PCB Tabs 7 70323 PCB Fuse Holders 70325 PB12 faceplate PB12 faceplate 80105 Power cord Power cord 70305 Strain relief Strain relief PB12 PREAMP Version 76 3 Parti Designator Description Semiconductors 60102 U1 TLO 64 OP amp 60100 U2 LM324 OP amp Capacitors Film Caps may be used in any position EXCEPT C1 C2 30707 C1 200uF 50V BP Electrolytic 30504 C10 100nF
9. 50V mono ceramic 30504 C11 100nF 50V mono ceramic 30504 C12 100nF 50V mono ceramic 30504 C13 100nF 50V mono ceramic 30530 C16 100nF 50V mono ceramic 30531 C17 150nF 50V mono ceramic 30100 C18 330pF 50V mono ceramic 30100 C19 330pF 50V mono ceramic 30707 C2 200uF 50V BP Electrolytic 30502 C20 100nF 50V mono ceramic 8 25 PB12 PB12 Electrical Parts List Cont PB12 PREAMP section of PCB Version 6 3 7 0 Part Designator Description 30502 C21 100nF 50V mono ceramic 30502 C22 100nF 50V mono ceramic 30502 C23 100nF 50V mono ceramic 30101 C3 220pF 50V mono ceramic C30 NOT USED 30101 C4 220pF 50V mono ceramic 30101 C5 220pF 50V mono ceramic 30101 C6 220p 50V mono ceramic C7 Or C8 Or 40730 C9 1k 25W Metal Resistor 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 NOT USED R16 NOT USED 40732 R17 56k2 25W metal 40722 R18 6k8 25W carbon 40722 R19 6k8 25W carbon 40405 R2 4k7 25W carbon 40722 R20 6k8 25W carbon R21 Or 40722 R22 6k8 25W carbon R23 Or 40109 R24 604r 25W metal 40412 R25 33k2 25W metal 40405 R26 4k7 25W metal 40109 R27 604r 25W metal 40412 R28 33k2 25W metal 40406 R3 100 25W carbon 40403 R30 10k 25W metal 40733 R33 12k1 25W metal 40734 R34 120k 25W metal 40451 R35 137k 25W metal 40406 R4 100k 25 carbon 40406 R5 100k 25W carbon 26 PB12 PB12 Electrical Par
10. Boards version 6 4 35 Printed Circuit Boards PCB version 7 2 36 Schematics Preamp PCB version 6 3 7 0 39 Power Amp PCB version 6 0 6 3 40 Power Amp PCB version 7 0 41 Preamp PGB version 7 2 5 Sikes ee eee 42 Power Amp PCB version 7 2 43 PB12 UBL SAFETY INFORMATION 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 procedures are to be performed by qualified service personal ONLY Caution This unit does not have a power switch Hazardous voltages are present within the unit whenever it is plugged in 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 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
11. IDENTIFIED 2 Power Cord To AC WITH THE IEC SYMBOL ZA IN THE SCHEMATIC DIAGRAM ARE TEANSEOBMERIS MOUNTED ONFACEBPATE DESIGNATED COMPONENTS IN WHICH SAFTETY CAN BE OF DIODE BRIDGE 3055 20821 AB SPECIAL SIGNIFICANCE WHEN REPLACING A COMPONENT QUICK FIT TERMINAL Cx IDENTIFIED WITH CX Usa 1001F GND QUICK FIT TERMINAL 3m6H QUICK FIT TERMINAL R8A 10k Part No Revision 7 2 PNRAMP Due 25 0 2001 43 ey Rev 1 Sheet 2560 1 2 w 11 12 13
12. Input Power Lowe 2 ga a Power Cons rated 334 Watts 240 nom line vot 150 Watts 5 6 Oh inal li Short Circuit Protection functional Direct short at output Amplifier should resume operation after short Thermal Protection eee DC Offset Protection vss DC present at Speaker Out leads Line Fuse Rating USA Domestic 120v 2 Amps Type T or Slo Blo 250 V 1 EU 230v 1 Amps Type T or Slo Blo 250 V External fuse with UL SEMKO rated holder 5 00261 2 UBL PB12 PB12 Subwoofer Controls and their Function 1 Power These lights will be red when the unit is Front Pa nel 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 until a signal is present again 2 Level Control The subwoofer Level Control PB12 located on the rear panel adjusts the volume of the subwoofer relative to the rest of the system 00235 3 LFE Normal Switch Ordinarily placed in the Normal position 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 Rear Pa nel 5 Crossover Frequency Sets the highest frequency the subwoofer will reproduce 6 Line
13. Q 5 g SECONDARY 3aG TRANSFORMER 08 R46 25 R44 Rar R45 Lo R33 014 gt A Ll PWRAMP 72 SILKSCREEN FANCY Version 7 2 125 holes NOT thru plated 38 SCHEMATIC DIAGRAMS Pre Amp PCB version 6 3 1 2 3 4 R27 A Rig 3rd Order Hi Pass DUAL RCA 5k 58 soir E METER Sk Pe NOT USED SWSPDT Rin R28 LEVEI 12 C18 330 3 2 p co ip gt 220p 5 4513 D C m GND Sj oU i 3 5 IS C19 330pF aks Phase Switch or R25 NOT USED RIV nm R24 R13 R35 iH 137k RCA CONNECTOR 604r R10 B POST HiLev 10k 2nd Order LO PASS 2nd Order Hi Pass Rl CA 220pF LO PASS CONTROL 1 c AME iD RS V R33 RIS 20k POT Cio 1 AA A AAA R R RS of Y 2 a 100nF R4 H E 7 RIO 1 L B R3 R9 6k8 20k POT v 5 gt 5 _ 100k 207 uu OUT c2 130nF 1000F 200uF RR mu 26 22 rorPasscoNTROL2 27 220pF E 1001F 100uF 1008 100nF 1002 R20 6k8 amp 2nd Order LO PASS E B r 5 g 8 R21 SWSPDT Apa A
14. 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 CROSSOVER FREQUENCY R D LINE LEVEL IN a E Make sure your receiver or processor is configured correctly Make sure that the subwoofer is configured as On Note for advanced users If your receiver processor has a built in low pass crossover filter for the subwoofer output then the LFE switch should be set to the LFE position to bypass the subwoofer s internal crossover 00232 5 PB12 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 Frequency Effects channel Connect these jacks to the LFE output or subwoofer output on your receiver or amplifier Note If your receiver or amplifier only has one subwoofer output jack then RECEIVER PREAMPLIFIER Subwoofer Output LFE 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 choo
15. 04 40412 40709 40732 40722 40722 40722 40722 40109 40412 40405 40109 40412 40403 40733 40734 40451 40402 40707 R35 LEVEL LOPASS 4k7 4k7 100k 100k 100k 100k 2k7 2k7 10k 59k 45k3 33k2 68k1 NOT USED NOT USED 56k2 6k8 6k8 6k8 0 ohms 6k8 0 ohms 604 ohms 33k2 4k7 604 ohms 33k2 10k 12k1 120k 137k 5k POT Dual 20k POT 5 Amp 596 5 Amp 596 5 Amp Glued into cabinet 100VA 25W 5 25W 5 25W 5 25W 5 25W 5 25W 5 25W 5 25W 5 25W 5 25W 5 25W 196 25W 196 25W 196 25W 196 25W 5 25W 5 25W 5 25W 5 25W 196 25W 196 25W 196 25W 196 25W 196 25W 196 25W 196 25W 196 25W 196 20 20 Capacitors Film Caps may be used in any position EXCEPT C1 C2 30 ferrite bead ferrite bead choke Male connector With 2 Bi color LED 2 PCB mount fuse clips SloBlo 3AG 0 187 PCB fastons 0 250 PCB fastons PB12 faceplate Power cord Strain relief Power Switch 4632 transformer carbon carbon carbon carbon carbon carbon carbon carbon carbon carbon metal metal metal metal carbon carbon carbon carbon metal metal metal metal metal metal metal metal metal Log A Pot Lin B Pot SAFETY SAFETY SAFETY SAFETY SAFETY SAFETY SAFETY Part Ref Designator Description 30707 C1 200uF 50V 20 Electrolytic 30707 C2 200uF 50V 20 Electrolytic 30101 C3 220pF 50V 20 ceramic 30101 C
16. 1N nuts Nehar EE Q10 Q11 MPSA56 U1 U2 LM324 TLO64 Q1 2N5457 Q12 2N4401 bel fe s e s s SJ S L i 3 Collector 3 Collector La H 5 2 2 1 D 2 1 3 1 Emitter 1 1 Emitter OUT INZ 3 3 00227 19 PB12 Testing Procedure JBL PB12 TESTING PROCEDURE A Power Amp Section Resistance from O P of the module to GND should be gt 1 NO LOAD Check Resistance from V of the module to V of the module should read gt 10k Hesistance from of the module to O P of the module should read 1M Resistance from V of the module to O P of the module should read gt 1M 2 Power Up LED RED With a 5mV signal to Low level input LED should change to GREEN Voltage measurements DVM OP AMP LED P Ut 1 P U1 7 14VDC GREEN 14 0 3 D C Operation Voltage measurements DVM on Power Amp Module A eaan 2 4 Check Switching Frequency Use scope EITHER USES AN ISOLATION TRANSFORMER OR ATTACHES THE PROBE TIP TO SPK and REFERENCE LEAD TO SPK A 10mV signal may need from the input to trigger the Switch turn on Reading 100kHz 10 500mVpp B Pre Amp Section 1 Low Level Input Sensitivity Set up Turn level Low Pass Pot Fully CW and LFE switch off Generator set at 200mV 50Hz Signal to Low level input 20 00279 1 PB12 Integrated Circuit Diagrams Cont Voltage measurements
17. 2nd order variable 2nd order fix 24 db Octave Subsonic fiter HPF 24404 Fixed 200 gt LP lt 1K Hz LFE input driven Speaker input driven 4 Ohms Maximum Output Power Maximum THD as a result of limiting HP Speaker out Phase switch Input Configuration Line In L R amp LFE Spkr Hi Level I Signal Sensing ATO Auto Turn On yes no LOG functional A Taper YES functional Refer to Filter section deg functional functional Dual jack functional Bindi 1 tor L amp R ATO Input test frequency 50 Hz functional i ATO Level LFE Input 4 mV functional Maximum acceptable level ATO Level Speaker in 50 mV functional s Maximum acceptable level Power on Delay time 3 sec 4 Power Applied Amp connected and AC on then ATO Turn on time functional signal applied Auto Mute Turn OFF Time is 15 T before muting after signal Auto turn of time must be 5 gt lt 15 Transients Pops Aaaa aaa ATO Transient pS mVpeak _ Speaker Outputs 0 1 Turn on Transient 50 2vpp Speaker Outputs ACLinecyced romOFFtoON Turn off Transient Efficienc tree ene Efficiency 6 64 Line voltage 120 VAC Stand by
18. 4 220pF 50V 20 ceramic 30101 C5 220pF 50V 20 ceramic 30101 C6 220p 50V 20 ceramic C7 Or C8 Or 40730 C9 1k 2bW 196 Metal Resistor 30504 C10 100nF 50V 10 mono ceramic 30504 C11 100nF 50V 10 mono ceramic 30504 C12 100nF 50V 10 ceramic 30504 C13 100nF 50V 10 mono ceramic 30530 C16 100nF 50V 5 ceramic 30531 C17 150nF 50V 5 ceramic 30100 C18 330pF 50V 20 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 ceramic 30502 C23 100nF 50V 20 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 U1 TLO 64 Quad OP AMP 60100 U2 LM324 Quad OP AMP Miscellaneous See pages 15 17 for more external parts 70150 DEFEAT SW SW SPDT mini Toggle 70150 PHASE SWITCH SW SPDT mini Toggle 108324 Li Ri RCA connector 90 Deg DUAL RCA yellow 108116 HI LEVEL Binding Post OUT Binding Post 108116 HI LEVEL Binding Post IN Binding Post 31 PB12 PCB s version 6 3 Cont FANCY Version 6 3 0908 lt lt lt 2 LENA 3 Boao 0000000000000 0000000 000000 00 0 00000 ers
19. 63 gtl Board layer 1 Scale COMP SIDE 00266 2 33 UBL PB12 uots54o AJNUJA N3382S5 115 9 uorsaen dAV 3Md 5 3 44 9 c 3 R m ps i c 2 o gt gt o 2 0002 INV 9 uotsa4en ino 973 Cc 012 39018 30010 YOTa ei Ll Ozu ved 9T 554 800 uzd OEY 1041 02 559901 I3 81 310038 13031 34 PCB version 6 4 Power Amp only 708 Cow GA PRERMP Version 6 3 R30 RZA RZB R27 R 2000 Rig x 2 4 5 o T DIODE BRIDGE 8 amp c78 2 RBA AC 1 PWRAMP Version 6 4 SILKSCREEN 35 FANCY Version 6 PCB version 7 2 36 PCB version 7 2 COMP SIDE FRNCY Uersion 7 2 125 holes NOT thru plated 37 PCB version 7 2 2 4 8 2 228882288 mC PREAMP Version 7 2 3232 828888 TO TRANS PRI 62 R34 R42 010 E
20. 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 50104 D7 1N4148 5 519 Diode 50104 D8 1N4148 5 Sig Diode 50112 D10 1N5242B 12V 5 5w Zener 50104 D11 1N4148 Sig Diode 50112 D12 1N5242B 12V 5w Zener 50104 D13 1N4148 Sig Diode 50104 D14 1N4148 Sig Diode 60157 Q1 2N5457 25V N chnl FET 60155 Q10 2N5401 120V PNP 600mA 60155 Q11 2N5401 120V PNP 600mA 60156 Q12 2N4401 40V NPN 600mA 50100 DIODE BRIDGE RS604 6AMP Bridge rectifier SAFETY 60102 U1 TLO64 Quad OpAmp 60302 MODULE S64AMI Power Amp Module SAFETY Miscellaneous 80121 L1 220uH 5 Amp 5 Gapped Ecore choke 80122 L2 8u5H 5 Amp 5 ferrite bead 29 Part 80122 80122 80138 70322 108326 70323 80117 70324 70328 70325 80105 70305 70151 80116 Ref Designator L3 L4 CMC LED 3 LED Harness 3AG TYPE 3AG FUSE 0 187 Tabs 0 250 Tabs PB12 faceplate Power cord Strain relief Switch Transformer Description 8u5H 8u5H 3m6H Molex 2 header Molex 2 socket 3AG PC CLIP 2A fuse SW SPST 4632 PREAMP section of PCB Version 7 2 Resistors 40405 40405 40406 40406 40406 40406 40717 40717 40409 40731 405
21. D 40722 R26 6k8 25W 5 carbon 40738 R27 10k 2W 5 metal SAFETY 40739 R28 1k2 0 25W 5 40739 R29 1k2 0 25W 5 carbon 40738 R30 10k 2W 5 metal SAFETY 40417 R31 47k 25W 5 X carbon 40417 R32 47k 25W 5 40427 R33 23k7 25W 196 metal 40403 R34 10k 25W 196 metal 40407 R35 220K 25W 5 carbon 40420 R40 1k 25W 5 40701 R41 1000k 25W 5 X carbon 40741 R42 22k 5 metal 40701 R43 1000k 25W 5 X carbon 40406 R44 100k 25W 5 40415 R45 470K 25W 5 carbon 40701 R46 1000k 25W 5 40409 R47 10k 25W 5 carbon 40409 R48 10k 25W 5 28 Part Ref Designator Description 40726 R49 15k 25W 5 X carbon 40727 R50 2k2 25W 5 carbon Capacitors 30710 C1 2200uF 100V 80 20 Electrolytic 105C SAFETY 30710 C2 2200uF 100V 80 20 Electrolytic 105C SAFETY 30502 C3 100nF 50V 20 ceramic 30502 C6 100nF 50V 20 ceramic 30521 100nF 250V 20 ceramic film SAFETY 30521 C7B 100nF 250V 20 ceramic film SAFETY 30718 C10 4u7F 100V 20 BP NP Electr DF 1 30523 C11 330nF 100V 20 ceramic 30532 C20 220nF 250V 20 metallized polyester 30502 C21 100nF 50V 20 ceramic 30502 22 100nF 50V 20 ceramic 30527 24 330nF 50V 5 ceramic C25 NOT USED 30508 C26 10nF 50V 10 ceramic 30513 C27 3n3F 50V 10 ceramic 30711 C32 22uF 35V 80 20 Electrolytic 30715 C40 10uF 16V 80 20 Electrolytic 30716
22. Input Main Input connection to subwoofer preferred 7 Speaker In Jacks Main Input connection to subwoofer when line level subwoofer or pre amp output connectors are not available or when a high pass filter set at 150Hz to main loudspeakers is desired through the Speaker Output Jacks 8 Speaker Out Jacks Connected to main loudspeakers when the Speaker Input Jacks are used 9 Power Switch Turns the PB12 on or off PB12 Speaker Connection When we designed the PB10 and 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 system and follow the corresponding hookup instructions To use the binding post speaker terminals with bare wire unscrew the collar until the hole through the centerpost is visible under the collar Insert the bare end of the wire through the hole in the post then screw the collar back down until the connection is tight The holes 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
23. JBL PowerBass Series PB12 subwoofer SERVICE MANUAL JBL Incorporated 250 Crossways Park Dr REV2 10 2001 Woodbury New York 11797 1 TABLE OF CONTENTS Safety Information er e rs Rupe eei e tet ba 3 Basic Specifications 4 Detailed Specifications 2 5 Controls and their Function 270 2 2 4 6 Speaker Connection 7 T 10 Troubleshooting 11 Test Setup and Procedure 12 Service Bulletin JBL 2001 03 13 Service Bulletin JBL 2001 05 14 Service Bulletin JBL 2001 07 15 Exploded and Packagilig aie cit erede 16 Amplifier Exploded View 2 2 17 Amplifier Faceplate 18 Integrated Circuit 19 Testing e c dile 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
24. S cl 1 pus GAIN STAGE ae 2 4 al Un designated Connector 4 To Pin 11 U1 U2 4 e 100uF 1530 1 4 R22 T R30 3 5 EKS LoPass Defeat Sw 10k 8 I B Led Harness 5 SIG 2 REDI 15 O 6 15V Prom PwrAmp So R23 16 x id x 5 Or Pin 14 01 02 Noru 2 4 22 1009 NOT USED NOTUSED USED EE A 00266 4 12 PREAMP 6 3 pcb Size Number Revision Tabloid 5 Date 20 Apr 2000 Sheetl of 1 File 2 sch Folder PB12 preamp Rev5jschirawn By MS LL 1 2 3 4 39 Power Amp PCB version 6 0 6 3 L i 1 2 1 4 5 9 10 iii gt R44 1000k SIGNAL LED amp AUTO MUTE Not Comected V LED On Hamess R100 s 14148 NOT USB CAL Un d ied Connector nu 11064 juHames On UT OnHamess Hamess asy 15 11 gi IN4148 a mute IN5242B GND ds 1000k GND zA g I 1000k 1NS242B 2CrLED 2 CH LED as S E To Ul Pin4 NOT USED R AKT 695 ASR T SHORT CIRCUIT PROTECT RI j Nor 2 D R6 _ ok 7
25. at some time in the future you happen to rearrange your listening room and move your speakers you should experiment with the phase switch in both positions and leave it in the position that maximizes bass performance If you used the line level inputs and there is no sound from the subwoofer Check that receiver amplifier is on and a source is playing Check that powered subwoofer is plugged into an active electrical outlet and is switched on Check all wires and connections between receiver amplifier and subwoofer Make sure all wires are connected Make sure none of the wires are frayed cut or punctured Review proper operation of your receiver amplifier e Slowly turn the Level Control clockwise until you begin to hear the desired amount of bass Make sure that you have configured your receiver processor so that the subwoofer LFE output is on PB12 PB12 TEST SET UP AND PROCEDURE AC VOLT METER 6V FROM ya CD PLAYER LINE LEVEL LINE LEVEL usd SOURCE T FREQUENCY m AME Powerbass PB10 e PB10 or PB12 LOR UNDER TEST e ror LFE use torr AMPLIFIER HIGH LIVEL IN B ji L SPEAKER SPEAKER LEL LEVEL OUTPUT OUT FROM 8 AMPLIFIER 00229 General Function Unit Under Test 1 T 8 Connect one line level input cable RCA from signal generator to either Right or Left Level input on UUT VOLUME control should be full conterclockwise Make sur
26. ated 250 Crossways Park Dr Woodbury New York 11797 15 PB12 Exploded and Packaging Views IMAGE REDUCED 16 a A N 12 Woofer Foot Outer Carton Owner s Manual 120V Amplifier Complete Foot Screw Foam corners package drawing 7 8 Top Corner 4 carton Bottom Corner 4 carton eo N N MECHANICAL amp PACKING PARTS LIST 203500 203410 203520 203430 Not For Sale 203411 203460 203470 PB12 Amplifier Exploded View 17 4 S 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 80117 7 Power Switch 70151 PB12 LEVEL KNOB 70313 LFE DEFEAT SWITCH 70150 PB12 FACEPLATE 70325 HI LEVEL I O IN 108116 POWER SWITCH 70151 LEVEL Min Max LFE NORMAL PHASE 0 180 CROSSOVER FREQUENCY 50Hz 5150 Powerbass 1 R LINE LEVEL IN ror LFE USE Lor L SS HIGH LIVEL IN R iS HIGH LIVEL OUT SMS 120V 60 Hz 180W JBL INC NORTHRIDGE U CAUTION RISK OF ELECTRIC SHOCK DONOTOPEN To reduce the risk of electric shock expose this equipment to rain or moj 18 Amplifier Faceplate Parts 00264 PHASE SWITCH 70150 CROSSOVER FREQUENCY KNOB 70313 HI LEVEL OUT 108116 STRAIN RELIEF 70305 POWER CORD 80105 PB12 Integrate
27. control to a higher setting between 120Hz 150Hz This control is not used when the LFE switch is in the LFE position Note It will take several minutes for the LEDs to turn from green to red after the input signal to the subwoofer is removed Due to JBL s unique high output high efficiency amplifier design power consumption is minimal room size subwoofer placement type of main speakers and listener position Adjust the subwoofer level so that the volume of the bass information is pleasing to you 4 LEVEL LFE NORMAL PHASE 6 180 CROSSOVER FREQUENCY Hm PowerBass PB10 L R bee LINE LEVEL IN For LFE use L or R HIGH LEVEL x IN 120V 60Hz 160W UBL PowerBass PB10 CAUTION 10 when the subwoofer is not receiving a signal LEVEL 22 hiin LFE NORMAL PHASE 123 a CROSSOVER FREQUENCY PowerBass PB12 L R LINE LEVEL IN For LFE use L or R L HIGH LEVEL IN 120V 60Hz 160W POWER UBL PowerBass PB12 00232 7 PB12 Phase Control 0 27 Phase 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 listener position Adjus
28. d Circuit Diagrams S53AMI S64AMI Power Amp module SAFETY PART NOTE THE FOLLOWING PROCEDURES MUST BE FOLLOWED WHEN INSTALLING NEW S53AMI S64AMI 46V 15 1 46V AMP MODULES Ls FAILURE TO FOLLOW ONE OR MORE OF THESE STEPS 16 2 MAY RESULT IN THE INSTANT DESTRUCTION OF THE MODULE WHEN POWERED UP V 17 3 V a 1 Align white indent marker on Amp Module with indent 18 4 marker on main PCB alternately observe position of label on top of the module incorrectly replacing the Module O P 19 5 180 in the slot will result in its destruction 20 6 2 All AC powered test instruments meters oscilloscopes LJ etc must have a floating ground i e be connected to an y 21 7 y isolation transformer 3 Align and position the Amp Module before soldering 22 4 Attach the amp Module with the mounting screws before 415V 23 9 4154 soldering or powering up 5 Use only rosin core or non acid core solder thoroughly SD 24 10 SD de flux the surfaces after soldering FR 25 11 FR If the new S53AMI S64AMI Amp Module has larger mounting hole s in the case and the stock screws longer will fit WP 26 12 and screws of the proper type cannot be obtained locally order GND 27 13 GND 2 partit 603015 screws 15V 28 14 15V 2 part 6030
29. e the LFE Normal switch is in the NORMAL position Turn on generator adjust to 100mV 50 Hz Plug in LED s on the front panel may be either Red or Green Turn VOLUME control full clockwise Low Pass control should be set fully clockwise 150 Hz LED should turn Green immediately bass response should be heard and felt from port tube opening Turn off generator turn VOLUME control fully counterclockwise disconnect RCA cables 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 Turn on generator and adjust so that speaker level output is 1 0V 50 Hz Turn VOLUME control full clockwise Green LED should light immediate bass response should be heard and felt from the port tube opening Sweep Function 1 2 Follow steps 1 4 above using a sweep generator as a signal source Sweep generator from 20Hz to 300Hz Listen to the cabinet and drivers for any rattles clicks buzzes or any other noises If any unusual noises are heard remove driver and test Driver Function 1 2 3 Remove driver from cabinet detach and wire clips Check DC resistance of driver it should be 4 8 ohms Connect a pair of speaker cables to driver terminals Cables should be connected to an integrated amplifier fed by a signal generator and adjust so that speaker level output is 5 0V Sweep generator from 20Hz to 1kH
30. 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 C10 4 7uF 100 volt NPE low df radial S64AMI Power output module Use only factory replacement Faceplate Faceplate Use only factory replacement Air leak cover Use only factory replacement CMC Use only factory replacement L1 Use only factory replacement Fuse PCB Use only factory replacement 00232 19 Main PCB Use only factory replacement PB12 BASIC SPECIFICATIONS PB12 Subwoofer Output Power 250 watts RMS Driver 12 Woofer Frequency Response 25Hz to 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 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 00261 1 Weight 40 Ib 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 PB12 DETAILED SPECIFICATIONS PB12 Subwoofer JBL PB 12 250W Powered Sub Amp LINE VOLTAGE US 120vac 60Hz EU 230vac 50 60Hz Hi Lo Line Nom Unit 108
31. line level output Connect your receiver or amplifier s front left and right speaker terminals to the left and right terminals on the subwoofer that are marked High Level In Connect the left and right terminals on the subwoofer that are marked High Level Out to the corresponding terminals on the back of your front left and right speakers Connect your receiver or amplifier s center left and right surround speaker terminals to the corresponding terminals on the back of your center left and right surround speakers Left Front Right Front Receiver Center Ri Left Front ight Front RR 88 Ii 00 Right Surround i Left Surround Right Surround 00232 3 PB12 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 patch cords to connect the line level subwoofer outputs on your receiver or amplifier to the line level inputs on the subwoofer IMPORTANT Make sure that the LFE toggle switch on the subwoofer is in the Normal position Do not use the LFE RECEIVER Subwoofer Out position with Dolby Pro Logic only processors Note If your receiver or amplifier only has one subwoofer output
32. o UI Pin 11 luF N4148 ii Header Socket 15 15 2 2 15 6 15 C40 1N4148 mtj 5 T 10k c 7 GND 4 1000k L 2 ms DE 1452428 R42 R44 A ped Bi ClrLED Bi ClrLED 2 10uF 1 00 5 100k a svj lt 5 4 4 4 NOTUSED To UI Pind aud nd 330nF R21 AKT t SHORT CIRCUIT PROTECT RTA 0 Q RIC C6 ue 10k lt 10 10k n 47R s 100 INS234B M 564 d CONNECTOR T 25401 SW D5 012 1N4735A 2N4401 D7 wne 1N4148 1N5265B 2N5401 N RII NOT USED R28 1k2 R25 NOT USED R29 8u5H Cx QUICK FIT TERMINAL NOT USED 1k2 C10 cll e ps 1N4938 4u7F 330nF ized K 11 SPK2 14148 PAY 4 RIS L QUICK FIT TERMINAL NOT USED T USED R9 NOT USED c21 5 100nF DI 80117 1 1 LN 5 3AG FUSE On p TOTRANS PRI 2 SIoBlo LIVE sw SPST 70151 D G ToAC lt gt Pare 100nF QUICK FIT TERMINAL QUICK FIT TERMINAL AN 4 To GND s ALL SAFETY PRECAUTIONS IN THIS MANUAL SHOULD BE MODULE FOLLOWED DURING SERVICING COMPONENTS
33. olytic 105C 30532 C20 220nF 250V metallized polyester 30502 C21 100nF 50V mono ceramic 30502 C22 100nF 50V mono ceramic 30527 C24 330nF 50V mono ceramic C25 NOT USED 30508 C26 10nF 50V mono ceramic 30513 C27 3n3F 50V mono ceramic 30502 C3 100nF 50V mono ceramic 30711 C32 22uF 35V 80 20 Electrolytic 30715 C40 10uF 16V 80 20 Electrolytic 30716 C41 1uF 16V 80 20 Electrolytic 30717 C42 100uF 16V 80 20 Electrolytic 30502 C6 100nF 50V mono ceramic 30521 100nF 250V ceramic film 30521 C7B 100nF 250V ceramic film 2 cw NOT USED 30505 CZ 100nF 100V ceramic film B 23 PB12 PB12 Electrical Parts List Cont PB12 POWER section of PCB Version 6 3 7 0 Part Designator Description Resistors R100 NOT USED 40105 R10A 0 18 BW 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 25W carbon 40718 R14 3k3 25W carbon R15 NOT USED 40735 R1A 7k5 2W metal 40735 R1B 7k5 2W metal 40735 R1C 7k5 2W metal 40405 R21 4K7 25W carbon 40736 R22 42K2 25W metal 40737 R23 187k 25 metal R24 NOT USED R25 NOT USED 40722 R26 6k8 25W carbon 40738 R27 10k 2W meta 40739 R28 1k2 0 25W carbon 40739 R29 1k2 0 25W carbon 40735 R2A 7k5 2W meta 40735 R2B 7k5 2W meta 40735 R2C 7k5 2W meta 40703 R3 8M2 25W carbon 40738 R30 10k 2W meta 40417 R31 47k 25W carbon 40417 R32 47k 25W carbon 40427 R33 23k7 25W meta 40403 R34 10k 25W meta 40740 R4
34. or resistance test as follows Leakage Current Note there is no power switch on this unit When the power plug is plugged in the unit is live 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 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 the problem is located and corrected Critical Components All components identified with the IEC symbol in the parts list and the 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 List of SafetyComponents Requiring ExactReplacements F1 Fuse SLO BLO 2 0 250V UL approved PWRCORD SPT 2 or better with polarized plug UL approved wired with the hot side to fused Side Use with factory replacement panel strain relief only TRX Transformer Use only factory replacement BR RECT Bridge diode Use only factory replacement C1 2 2200uF 100V electrolytic filter caps Be sure replacement part
35. se Connect each speaker to the corresponding speaker terminals on your receiver or amplifier Make sure that you have configured your surround sound processor for Subwoofer On or LFE On LEVEL C Min Max LFE NORMAL PHASE o 180 CROSSOVER FREQUENCY 150Hz LINE LEVEL I The front left front right center and rear speakers should be set to Small or Large depending on their size and frequency response Consult your receiver s or processor s owner s manual 00232 6 PB12 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 Level Control The subwoofer Level Control adjusts the volume of the subwoofer relative to the rest of the system Proper level adjustments depends on several variables such as 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 between 50Hz 100Hz This will concentrate the subwoofer s efforts on the ultradeep bass sounds required by today s films and music If you are using smaller bookshelf speakers that do not extend to the lower bass frequencies set the low pass crossover
36. t the phase switch to maximize bass output at the listening position Remember every system room and listener is different There are no right or wrong settings this switch offers the added flexibility to adjust your subwoofer for optimum performance for your specific listening conditions without having to move your speakers TROUBLESHOOTING If you used the high level speaker inputs and there is no sound from any of the speakers Check that receiver amplifier is on and source is playing Check that powered subwoofer is plugged into and active electrical outlet and is switched on Check all wires and connections between 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 switched on Adjust the crossover point Flip the Phase Control switch to the opposite position f you are using a Dolby Digital DTS receiver or processor make sure that the subwoofer adjustments on the receiver processor are set up correctly e Slowly turn the Level Control clockwise until you begin to hear the desired amount of bass 11 If
37. the load 100KHz 10 5 yes MODULE OK END A 10mV signal may need from the input to trigger the Switch turn on Check V V 15V voltage at the module Check transformer rectifier C2 D1 yes D2 RI A B C R2 A B C Check 6V at the module wrt V 5 75 Check D5 D6 R6 R7 A B C Check S D volt age at the module wrt V 5 1V Check D3 D4 R3 Q10 Q11 Q12 and SCP Use scope to check O P at module wrt GND 210Vpp square wave shown yes Check L1 L2 C10 C11 00279 3 22 PB12 PB12 Electrical Parts List PB12 POWER AMP PCB Version 6 3 7 0 Part 7 Designator Description 50100 BR RECT RS604 Bridge rectifier 50105 D1 1N4744A 15V 1w Zener 50112 D10 1N5242B 12V 5w Zener 50104 D11 1N4148 Sig Diode 50112 D12 1N5242B 12V Zener 50104 D13 1N4148 Sig Diode 50104 D14 1N4148 Sig Diode 50105 D2 1N4744A 15V 1w Zener 50114 03 1N5265B 62V 5w Zener 50104 04 144148 Sig Diode 50113 05 1N4735A 6 2V 1W 50103 D6 1N5234B 6V 5w Zener 50104 D7 1N4148 Sig Diode 50104 D8 1N4148 Sig Diode 60157 Q1 2N5457 25V N chnl FET 60155 Q10 2N5401 120V PNP 600mA 60155 Q11 2N5401 120V PNP 600mA 60156 Q12 2N4401 40V NPN 600mA 60102 U1 TLO64 Quad OpAmp Capacitors 30710 C1 2200uF 100V 80 20 Electrolytic 105C 30718 C10 4u7F 100V BP NP Electr DF lt 1 30523 C11 330nF 100V mono ceramic 30710 C2 2200uF 100V 80 20 Electr
38. tion VERY IMPORTANT Observe polarity on D10 in new location 5 Replace amplier test subwoofer to assure the unit goes into the standby mode 10 15 minutes after removing the Audio input signal Mods number Sus Swap locations AM tsertal numbers Unit may not switch to Standby Zener Diode D10 affected mode Resistor R42 22 Observe D10 polarity JBL Incorporated 250 Crossways Park Dr Woodbury New York 11797 516 496 3400 43 UBL Service Bulletin JBL2001 05 June 2001 To All JBL Service Centers Models PB12 Service Bulletin This is considered a Minor Subject Popping Every Few Seconds During Play In the event you receive a PB12 subwoofer with the complaint subwoofer thumps or pops every few seconds of play follow the procedure below Probable Cause Inductor L1 220uH may be damaged Check and Replace L1 if necessary 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 charred or burnt it must be replaced 5 Order JBL 80121 and replace 11 6 Replace the amplifier assembly back into the cabinet replace the screws
39. ts List Cont PB12 PREAMP section of PCB Version 6 3 7 0 Part Miscellaneous 108320 108116 108116 40402 40707 70150 70150 Designator RCA CONNECTOR HI LEVEL HI LEVEL LEVEL Crossover CONTROL LFE switch Phase Switch Binding Post Binding Post 5k POT 20k POT SW SPDT SW SPDT 27 OUT IN Description DUAL RCA yellow Binding Post Binding Post Log Pot Lin B Pot mini Toggle 00265 5 mini Toggle PB12 Electrical Parts List Version 7 2 Part Ref Designator Description POWERAMP section of PCB Version 7 2 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 7 5 2W 5 metal SAFETY 40735 R2C 7 5 2W 5 metal SAFETY 40703 R3 8M2 25W 5 carbon 40740 R4 33k 1W 5 metal SAFETY 40732 R5 56k2 25W 196 metal 40111 R6 47 ohms 25W 5 carbon 40738 R7A 10k 2W 5 metal SAFETY 40738 R7B 10k 2W 5 metal SAFETY 40738 R7C 10k 2W 5 metal SAFETY 40738 R8A 10k 2W 5 metal SAFETY 40738 R8B 10k 2W 5 metal SAFETY R9 NOT USED 40105 R10A 0 1 ohms 5W 5 metal 40105 R10B 0 1 ohms 5W 5 metal 40105 R10C 0 1 ohms 5W 5 metal 40420 R11 1k 25W 5 40420 R12 1k 25W 5 40417 R13 47k 25W 5 carbon 40718 R14 3k3 25W 5 carbon R15 NOT USED 40405 R21 4K7 25W 5 X carbon 40736 R22 42K2 25W 196 metal 40737 R23 187k 25W 196 metal R24 NOT USED R25 NOT USE
40. z Listen to driver for any rubbing buzzing or other unusual noises 12 UBL Service Bulletin Service Bulletin JBL2001 03 March 2001 This is considered a Minor repair To All JBL Service Centers Models PB10 PB12 Subject Unit Will Not Switch To Standby Mode When the power cord of the PB series subwoofer is plugged into a wall outlet and for the PB12 only the power switch is on and an audio signal is present the LED s on the cabinet face will turn green indicating the subwoofer is in the ON mode With the audio signal removed it will take 10 15 minutes for the LEDs to turn from green to red indicating the subwoofer is now in the STANDBY mode Power consumption is minimal in this mode In the event you receive a PB10 or PB12 subwoofer with the complaint The unit will not 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 no other connectors need to be unplugged 4 Locate Zener Diode D10 and Resistor R42 22k See illustration These parts must be swapped i e R42 soldered into the D10 location and D10 soldered into the R42 loca
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