JBL PowerBass PB12 Service Manual
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JBL PowerBass PB12 Service Manual

Powerbass series powered subwoofer
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See also: Owner's Manual
™
PowerBass
Series
PB12
Powered Subwoofer
Service Manual
JBL Consumer Products
250 Crossways Park Dr.
Woodbury, New York 11797
Rev10 2/2004

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Summary of Contents for JBL 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: Table Of Contents

    Power Amp (PCB version 7.0)…………… …………………..…….53 Preamp (PCB version 7.2)…………………………… ……….…….54 Power Amp (PCB version 7.2)……………………………. …… ….55 Schematics Version 2……………………………………………..…….…56 PB12 – DIFFERENCES IN REVISION 1 AND REVISION 2 REVISION 1 REVISION 2 Amplifier serial number starts with “HA”...

  • Page 3: Safety Information

    PB12 SAFETY INFORMATION Warning List of Safety Components Requiring Exact Replacements Any person performing service of this unit will be exposed to hazardous voltages and the risk of electric shock. It is Revision 1 Revision 2 Description assumed that any person who removes the amplifier from...

  • Page 4: Basic Specifications

    (with feet) 17 1/2" x 15" x 16" 445mm x 381mm x 406mm Weight 40 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.

  • Page 5: Detailed Specifications

    PB12 DETAILED SPECIFICATIONS PB12 Subwoofer JBL PB12 250W Powered Sub Amp LINE VOLTAGE Yes/No Hi/Lo Line Nom. Unit Notes US 120vac/60Hz 108-132 Vrms Normal Operation EU 230vac/50-60Hz 207-264 Vrms Normal operation, MOMS required Parameter Specification Unit QA Test Conditions Notes...

  • Page 6: Controls And Their Function

    Front Panel 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) until a signal is present again.

  • Page 7: Connections

    PB12 Speaker Connection When we designed the PB12 description best matches post is visible under the collar. powered subwoofers, our goal your system and follow the Insert the bare end of the wire was to offer the user the best...

  • Page 8: Dolby Pro Logic Line Level

    PB12 Dolby Pro Logic (Non-Digital) – Line Level Use this installation method for position with Dolby Pro Logic- Make sure your receiver or Dolby Pro Logic applications only processors. processor is configured (not Dolby Digital, DTS or other correctly: Make sure that the...

  • Page 9: Dolby Digital Or Dts Connection

    PB12 Dolby Digital or DTS (or Other Digital Surround Mode) Connection Use this installation method for Note: If your receiver or Make sure that you have Dolby Digital, DTS or other amplifier only has one configured your surround- digital surround processors:...

  • Page 10: Operation

    When a signal is present, removed. Due to JBL’s unique, the LEDs will turn green. high-output, high-efficiency amplifier design, power...

  • Page 11: Troubleshooting

    PB12 Phase Control The Phase Control determines phase switch to maximize bass If at some time in the future whether the subwoofer’s output at the listening position. you happen to rearrange your piston-like action moves in and listening room and move...

  • Page 12: Test Setup And Procedure

    PB12 PB12 TEST SETUP AND PROCEDURE AC VOLT METER (6V) LEVEL FROM LINE LEVEL LINE-LEVEL CD PLAYER NORMAL SOURCE PHASE CROSSOVER FREQUENCY 50 Hz 150 Hz PRE AMP PowerBass PB12 PB12 LI NE LEVEL I N UNDER TEST USE L or R...

  • Page 13: Service Bulletin Jbl 2001-03

    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.

  • Page 14: Service Bulletin Jbl 2001-04

    Subject: Hum, Buzz or “Thumping” In the event you receive a PB10 or PB12 subwoofer complaint: “There is an audible hum or buzz”, or the subwoofer “thumps” or “pops” every 10 seconds, then review the conditions below to determine the most...
  • Page 15 See serial numbers on Page 3 for factory Hum, Buzz or “Thumping” for symptoms described in #C only modified units PB12 Hum, Buzz or “Thumping” Replace Power Amp Module S64AMI for symptoms described in #C only * Revision 1 of the PB10/12: Amplifier faceplate says “Made in Canada”;...
  • Page 16 26438-26439 26700 28250 30152-30288 25251-25252 25779-25791 26443 26702 28256 30290-30345 25256-25257 25793-25833 26451-26452 26706 28259 30347-30413 25261-25263 25835-25845 26457-26458 26708 28264-28267 30415-30490 25265-25267 25847-25850 26460-26462 26713-26716 28270-28271 30492-30524 JBL Incorporated 250 Crossways Park Dr. Woodbury, New York 11797 (516) 496-3400...

  • Page 17: Service Bulletin Jbl 2001-05

    JBL part# 80121 PB12 * AM0035-24319 and above Modified by factory None required * Revision 1 of the PB12: Amplifier faceplate says “Made in Canada”; Amplifier serial number starts with “AM” Black (or silver) potted, non-serviceable S64AMI output module.

  • Page 18: Service Bulletin Jbl 2001-07

    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”...

  • Page 19: Service Bulletin Jbl 2001-08

    6) Complete any other repairs; reassemble and test the unit. NOTE: Some woofers that were used in the PB12 had similar terminals (both .205") so there is no polarity-keying if the woofer wires are unplugged for any reason, (even though the amp output terminals themselves are dissimilar (.205 and .250).

  • Page 20: Tech Tip Jbltt2003-04

    Do NOT mix & match these components from different manufacturers, or batches. They should be identical. * Late version PB10 or PB12 subwoofers (Revision 2 in the service manual) can be identified by: • Amplifier serial number starts with “HA”...

  • Page 21: Exploded View/Packaging

    7 & 8 Foam End Pad (Top & Bottom) 338132-001 Port tube Not For Sale 336799-001 Logo Badge 336485-001 336485-001 LED Ass’y for Logo Badge 338125-001 338125-001 (IMAGE REDUCED) Identification Of PB12 Revisions 1 and 2 can be found on Page 2.

  • Page 22: Amplifier Exploded View

    PB12 Amplifier Exploded View (Revision 1 Only) 00263 LEGEND Dual RCA jack 108320 Power Transformer 80116 Level Pot 40402 Crossover CONTROL 40707 Fuse Clips (2) 70323 2A SLO-BLO T TypeFuse (3AG) 80117 Power Switch 70151...

  • Page 23: Amplifier Faceplate/Access

    7 Strain Relief Plug 70305 061-314002-000 RISK OF ELECTRIC SHOCK 8 Power Cord 80105 083-041802-009 DO NOT OPEN 9 Power Switch 70151 074-020018-000 10 RCA Input jacks 108324 072-010007-000 Identification Of PB12 Revisions 1 and 2 can be found on Page 2.

  • Page 24: Integrated Circuit Diagrams

    PB12 Integrated Circuit Diagrams (Revision 1 Only) S53AMI/S64AMI - Power Amp Module SAFETY PART NOTE: THE FOLLOWING PROCEDURES MUST BE FOLLOWED WHEN INSTALLING NEW S53AMI/S64AMI AMP MODULES: FAILURE TO FOLLOW ONE OR MORE OF THESE STEPS MAY RESULT IN THE INSTANT DESTRUCTION OF THE MODULE WHEN POWERED UP.
  • Page 25 PB12 Integrated Circuit Diagrams (Revision 2 Only) 2N5401 MOSFET IRF640 OPAMP, QUAD Q18, 22 TL074CDR U2, 3 3 Collector 1. G Base 2. D 3. S 1 Emitter MPSW06RLRA, MPSW56RLRAMPQ, MPS2222ARLRA, OPAMP, DUAL 2N2907A, 2N5551, TIP31C TL072CDR SO-8, Q2, 16, 3, 21, 19, 23, 17...

  • Page 26: Testing Procedures

    PB12 PB12 Testing Procedure (Revision 1 Only)
  • Page 27 PB12 PB12 Testing Procedure (Cont.) (Revision 1 Only)
  • Page 28 PB12 PB12 Testing Procedure (Cont.) (Revision 1 Only)
  • Page 29 PB12 PB12 Testing Procedure (Cont.) (Revision 2 Only) A. Power Amp Section Resistance from S+ (SPK O/P) to GND should be >1M Ω (NO LOAD) Resistance Check Resistance from V+ (C6 P+) to V- (C8 P-) gradually Fully CHARGED should read >10k Ω...
  • Page 30 PB12 PB12 Testing Procedure (Cont.) (Revision 2 Only) - Voltage measurements OP AMP SPEAKER U2(1) U2(14) U2(8) U3(7) U3(1) U3(14) U3(8) U5(7) U5(1) 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 LFE switch off...
  • Page 31 PB12 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: Block Diagram Revision 2

    PB12 Block Diagram Revision 2 Only RevNo Revision note Date Signature Checked SPEAKER LEVEL PHASE CTRL SWITCH INPUT VOLUME CTRL DIF. AMP SUMMI NG AMP AMP STAGE Variable Rout 12dB/Octave 12dB/Octave 12dB/Octave Lout Line Level SUMMI NG AMP LIMITER /...

  • Page 33: Electrical Parts List (Pcb Version 6.3 - 7.0)

    PB12 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 1N4744A 1w Zener 50112 1N5242B .5w Zener 50104 1N4148 Sig Diode...
  • Page 34 PB12 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 metal 40105 R10B 0.1R metal 40105 R10C 0.1R metal 40420 .25W carbon 40420 .25W...
  • Page 35 PB12 PB12 Electrical Parts List (Revision 1 Only) PB12 POWER AMP section of PCB Version 6.3 -7.0. Part # Designator Description Miscellaneous 80121 220uH 5 Amp Gapped Ecore choke 80122 8u5H 5 Amp ferrite bead 80122 8u5H 5 Amp ferrite bead...
  • Page 36 PB12 PB12 Electrical Parts List (Revision 1 Only) PB12 POWER AMP section of PCB Version 6.3 -7.0. Part # Designator Description Resistors 40405 .25W carbon 40409 .25W carbon 40731 .25W carbon 40504 45k3 .25W metal 40412 33k2 .25W metal 40709 68k1 .25W...

  • Page 37: Electrical Parts List (Pcb Version 7.2)

    PB12 PB12 Electrical Parts List (Cont.) (Revision 1 Only) PB12 POWER AMP section of PCB Version 7.2. Part # Designator Description Resistors 40735 metal SAFETY 40735 metal SAFETY 40735 metal SAFETY 40735 metal SAFETY 40735 metal SAFETY 40735 metal SAFETY 40703 .25W...
  • Page 38 PB12 PB12 Electrical Parts List (Cont.) PB12 POWER AMP section of PCB Version 7.2. Part # Designator Description Capacitors 30710 2200uF 100V +80/-20 Electrolytic 105C SAFETY 30710 2200uF 100V +80/-20 Electrolytic 105C SAFETY 30502 100nF mono ceramic 30502 100nF mono ceramic...
  • Page 39 PB12 PB12 Electrical Parts List (Cont.) PB12 PREAMP section of PCB Version 7.2. Part # Designator Description 80122 8u5H 5 Amp ferrite bead 80122 8u5H 5 Amp ferrite bead 80138 3m6H 5 Amp choke SAFETY 70322 LED 3 Molex 2 header...
  • Page 40 PB12 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 200uF BP Electrolytic 30707 200uF BP Electrolytic 30101 220pF mono ceramic...

  • Page 41: Electrical Parts List Revision 2

    PB12 PB12 Electrical Parts List (Cont.) Revision 2 Only Part Number Description Reference designators Resistors 020-220497-120 Film Resistor 2K2 1/4W J 021-100401-120 MOF Resistor 1K 1W J R103 021-120403-020 MOF Resistor 1K2 3WS J 021-120405-020 MOF Resistor 1K2 5WS J...
  • Page 42 PB12 PB12 Electrical Parts List (Cont.) Revision 2 Only Part Number Description Reference designators Capacitors 031-100244-100 SMD Ceramic Capacitor 0u01/50V K C33, 45, 51, 66, 67, 5, 10 031-100343-100 SMD Capacitor 100pF/50V J C16, 36, 58 031-100344-100 SMD Capacitor 0u1/50V K...
  • Page 43 PB12 PB12 Electrical Parts List (Cont.) Revision 2 Only Part Number Description Reference designators Miscellaneous 041-115001-000 Bead Coil YT-10911 043-300101-000 Inductor 30uH YT-10033 043-324300-000 Inductor 324uH YT-10778 043-560200-000 Inductor 56uH YT-10779 043-700101-000 Toroidal Inductor 70uH YT-10682 044-100100-000 SMD Ferrite Bead...

  • Page 44: Printed Circuit Boards (Pcb Version 6.3)

    PB12 (PCB version 6.3) (Revision 1 Only)
  • Page 45 PB12 (PCB version 6.3) (Cont.) (Revision 1 Only)
  • Page 46 PB12 (PCB version 6.3) (Cont.) (Revision 1 Only)

  • Page 47: Printed Circuit Boards (Pcb Version 6.4)

    PB12 (PCB version 6.4) Power Amp Only (Revision 1 Only)

  • Page 48: Printed Circuit Boards (Pcb Version 7.2)

    PB12 (PCB version 7.2) (Revision 1 Only)
  • Page 49 PB12 (PCB version 7.2) (Revision 1 Only)
  • Page 50 PB12 (PCB version 7.2) (Revision 1 Only)

  • Page 53: Power Amp (Pcb Version 7.0)

    PB12 Revision 1 Schematic Diagrams POWER AMP (PCB version 7.0) LED1/2 Preamp LED1/2 Preamp 1000k SIGNAL LED & AUTO MUTE Not Connected V+ LED LED Harness 470K 1N4148 TLO64 R100 NOT USED Un-designated Connector TLO64 On Harness On Harness MOLEX 2...

  • Page 54: Preamp (Pcb Version 7.2)

    PB12 Revision 1 Schematic Diagrams PREAMP (PCB version 7.2) 3rd Order Hi-Pass DUAL RCA 5k POT 68k1 604r NOT USED REMOTE SW SPDT R In 33k2 LEVEL 330pF 220p 45k3 330pF TLO64 Phase Switch NOT USED 33k2 L In 33k2...

  • Page 55: Power Amp (Pcb Version 7.2)

    PB12 Revision 1 Schematic Diagrams POWER AMP (PCB version 7.2) LED1/2 Preamp LED1/2 Preamp 1000k SIGNAL LED & AUTO MUTE Not Used 470K LED Harness LED 3 1N4148 TLO64 TLO64 Molex 2 Molex 2 Not Used On Harness On Harness...

  • Page 56: Schematics Version 2

    PB12 Revision 2 Schematic Diagrams PREAMP NOTE: THIS VOLTAGE IS REFERENCED TO -V, NOT CIRCUIT GROUND...
  • Page 57 PB12 Revision 2 Schematic Diagrams POWER AMP NOTE: THIS VOLTAGE IS REFERENCED TO -V, NOT CIRCUIT GROUND NOTE: THIS VOLTAGE IS REFERENCED TO -V, NOT CIRCUIT GROUND...

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