JBL Incorporated

250 Crossways Park Dr.

Woodbury, New York 11797

REV 0 7/00

PowerBassTM Series

PB10Subwoofer

SERVICE MANUAL

PB10

2

TABLE OF CONTENTS

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Basic Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Detailed Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Controls and their Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Speaker Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Test Setup and Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Exploded and Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Amplifier Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Amplifier Faceplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Integrated Circuit Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Testing Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Printed Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

PB10

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SAFETY INFORMATION

PB10

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BASIC SPECIFICATIONS PB10 Subwoofer

PB10

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DETAILED SPECIFICATIONS PB10 Subwoofer

PB10

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PB10 Subwoofer Controls and their Function

1. Power - These lights will be red when the unit isplugged in and not receiving a signal; when the PB10receives a signal, the lights will cycle to GREEN. If nosignal is received after 10-15 minutes the lights willcycle back to RED (standby) until a signal is presentagain.

2. Level Control - The subwoofer Level Control, PB10,(located on the rear panel) adjusts the volume of thesubwoofer relative to the rest of the system.

3. LFE/Normal Switch - Ordinarily placed in the Normalposition - but switch to LFE when playing DolbyDigitaL, DTS or other digital surround modes - seepage 9.

4. Phase Switch - Changes the subwoofer’s output tobe in phase or 180 degrees out of phase with theprogram material.

5. Crossover Frequency - Sets the highest frequencythe subwoofer will reproduce.

6. Line Input - Main Input connection to subwoofer(preferred).

7. Speaker In Jacks - Main Input connection tosubwoofer when line level, subwoofer, or pre-ampoutput connectors are not available, or when a highpass filter (set at 150Hz to main loudspeakers isdesired through the Speaker Output Jacks.

8. Speaker Out Jacks - Connected to mainloudspeakers when the Speaker Input Jacks are used.

Rear Panel

Front Panel

PB10

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Speaker Connection

When we designed the PB10and PB12 poweredsubwoofers, our goal was tooffer the user the best possibleperformance combined withthe most flexible and completeinstallation options. Pleaselook over the following three

examples to determine whichdescription best matches yoursystem and follow thecorresponding hookupinstructions.

To use the binding-postspeaker terminals with barewire, unscrew the collar until

the hole through thecenterpost is visible under thecollar.

Insert the bare end of the wirethrough the hole in the post,then screw the collar backdown until the connection istight. The holes in the centerof the collars are intended forbanana-type connectors.

Dolby Pro Logic (Non-Digital)-Speaker Level

Use this installation method forDolby Pro Logic applications(not Dolby Digital, DTS orother digital processing),where the receiver/processordoes not have a subwooferoutput or a volume-controlledpreamp (line-) level output:

Connect your receiver oramplifier’s front left and rightspeaker terminals to the leftand right terminals on thesubwoofer that are marked“High Level In.” Connect theleft and right terminals on thesubwoofer that are marked“High Level Out” to thecorresponding terminals on the

back of your front left and rightspeakers.

Connect your receiver oramplifier’s center, left and rightsurround-speaker terminals tothe corresponding terminals onthe back of your center, leftand right surround speakers.

PB10

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Dolby Pro Logic (Non-Digital)-Line Level

Use this installation method forDolby Pro Logic applications(not Dolby Digital, DTS orother digital processing),where the receiver/processor isequipped with a subwooferoutput or a volume-controlledpreamp (line-) level output:

Use RCA-type patch cords toconnect the line-levelsubwoofer outputs on yourreceiver or amplifier to the line-level inputs on the subwoofer.IMPORTANT: Make sure thatthe LFE toggle switch on thesubwoofer is in the “Normal”position. Do not use the “LFE”

position with Dolby Pro Logic-only processors.

Note: If your receiver oramplifier only has onesubwoofer output jack, thenyou may connect thesubwoofer output on yourreceiver/preamplifier to eitherthe left or right line-level inputon the subwoofer. It makes nodifference which jack youchoose.

Connect each speaker to thecorresponding speakerterminals on your receiver oramplifier.

Make sure your receiver orprocessor is configuredcorrectly; Make sure that thesubwoofer is configured as“On.”

Note for advanced users: Ifyour receiver/processor has abuilt-in low-pass crossoverfilter for the subwoofer output,then the LFE switch should beset to the “LFE” position tobypass the subwoofer’sinternal crossover.

PB10

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Dolby Digital or DTS (or Other Digital Surround Mode) Connection

Use this installation method forDolby Digital, DTS or otherdigital surround processors:

IMPORTANT: Make sure thatthe LFE toggle switch on thesubwoofer is in the “LFE”position. Use the line-levelinput jacks for the low-Frequency Effects channel.Connect these jacks to the LFEoutput or subwoofer output onyour receiver or amplifier.

Note: If your receiver oramplifier only has onesubwoofer output jack, then

you may connect thesubwoofer output on yourreceiver/preamplifier to eitherthe left or right line-level inputon the subwoofer. It makes nodifference which jack youchoose.

Connect each speaker to thecorresponding speakerterminals on your receiver oramplifier.

Make sure that you haveconfigured your surround-sound processor for“Subwoofer On”or “LFE On.”

The front left, front right, centerand rear speakers should beset to “Small” or “Large”depending on their size andfrequency response. Consultyour receiver’s or processor’sowner’s manual.

PB10

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OPERATION

Power

When the unit is plugged inand the LEDs on the front ofthe unit will turn red. When asignal is present, the LEDs willturn green.

Note: It will take severalminutes for the LEDs to turn

from green to red after theinput signal to the subwoofer isremoved. Due to JBL’sunique, high-output, high-efficiency amplifier design,power consumption is minimalwhen the subwoofer is notreceiving a signal. The PB10

The subwoofer Level Controladjusts the volume of thesubwoofer relative to the restof the system. Proper leveladjustments depends onseveral variables such as

Level Control

room size, subwooferplacement, type of mainspeakers and listener position.Adjust the subwoofer level sothat the volume of the bassinformation is pleasing to you.

Crossover Adjustments

The Crossover FrequencyControl determines the highestfrequency at which thesubwoofer reproduces sounds.If your main speakers cancomfortably reproduce somelow-frequency sounds, set thiscontrol to a lower frequencysetting, between 50Hz-100Hz.This will concentrate thesubwoofer’s efforts on theultradeep bass sounds requiredby today’s films and music. Ifyou are using smaller bookshelfspeakers that do not extend tothe lower bass frequencies, setthe low-pass crossover controlto a higher setting, between120Hz-150Hz. This control isnot used when the LFE switchis in the “LFE” position.

must be unplugged if you donot wish to leave it in auto(standby) mode.

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Phase Control

The Phase Control determineswhether the subwoofer’spiston-like action moves in andout in phase with the mainspeakers or opposite the mainspeakers. There is no corrector incorrect setting. Properphase adjustment depends onseveral variables such assubwoofer placement andlistener position. Adjust thephase switch to maximize

bass output at the listeningposition.

Remember, every system,room and listener is different.There are no right or wrongsettings; this switch offers theadded flexibility to adjust yoursubwoofer for optimumperformance for your specificlistening conditions withouthaving to move your speakers.

If at some time in the futureyou happen to rearrange yourlistening room and move yourspeakers, you shouldexperiment with the phaseswitch in both positions, andleave it in the position thatmaximizes bass performance.

TROUBLESHOOTING

If you used the high-level(speaker) inputs and there isno sound from any of thespeakers:

•Check that receiver/amplifieris on and source is playing.

•Check that poweredsubwoofer is plugged intoand active electrical outletand is switched on.

•Check all wires andconnections betweenreceiver/amplifier andspeakers. Make sure allwires are connected. Makesure none of the speakerwires are frayed, cut orpunctured.

•Review proper operation ofyour receiver/amplifier.

If there is low (or no) bassoutput:

•Make sure the connections tothe left and right “SpeakerInputs” have the correctpolarity (+and-).

•Make sure that the subwooferis plugged into an activeelectrical outlet and (PB12only) switched on.

•Adjust the crossover point.

•Flip the Phase Control switchto the opposite position.

•If you are using a DolbyDigital/DTS receiver orprocessor, make sure that thesubwoofer adjustments onthe receiver/processor are setup correctly.

•Slowly turn the Level Controlclockwise until you begin tohear the desired amount ofbass.

If you used the line-levelinputs and there is no soundfrom the subwoofer:

•Check that receiver/amplifieris on and a source is playing.

•Check that poweredsubwoofer is plugged into anactive electrical outlet and isswitched on.

•Check all wires andconnections betweenreceiver/amplifier andsubwoofer. Make sure allwires are connected. Makesure none of the wires arefrayed, cut or punctured.

•Review proper operation ofyour receiver/amplifier.

•Slowly turn the Level Controlclockwise until you begin tohear the desired amount ofbass.

•Make sure that you haveconfigured yourreceiver/processor so that thesubwoofer/LFE output is on.

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PB10 TEST SET UP AND PROCEDURE

Min Max

LEVEL

50 Hz 150 Hz

LFE NORMAL

PHASE 1800

CROSSOVER

FREQUENCY

LINE LEVEL IN

L R

FOR LFE USE L or R

L

HIGH

LIVEL

IN

R

L

HIGH

LIVEL

OUT

R

0022

9

CD PLAYER

PRE AMP

AMPLIFIER

AC VOLT METER (6V)

LINE LEVEL

PB10 or PB12UNDER TEST

SPEAKER LEVEL

FROMLINE-LEVEL

SOURCE

SPEAKEROUTPUT

FROMAMPLIFIER

General Function

UUT = Unit Under Test

1. Connect one line level input cable (RCA) from signal generator to either Right or Left Level input on UUT. VOLUMEcontrol should be full conterclockwise.

2. Turn on generator, adjust to 100mV, 50 Hz.

3. Plug in UUT; LED’s on the front panel may be either Red or Green. Turn VOLUME control full clockwise. Low Passcontrol should be set fully clockwise (150°).

4. LED should turn Green; immediately bass response should be heard and felt from port tube opening.

5. Turn off generator, 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 anintegrated 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 and felt from the port tube opening.

Sweep Function

1. Follow steps 1-4 above, using a sweep generator as a signal source.

2. Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any othernoises. If any unusual noises are heard, remove driver and test.

Driver Function

1. Remove driver from cabinet; detach + and - wire clips.

2. Check DC resistance of driver; it should be 5.8 ohms.

3. Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed bya signal generator and adjust so that speaker level output is 5.0V.

4. Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.

PB10

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Exploded and Packaging Views

1

2

3

(IMAGE REDUCED)

4

5

0022

3

6

7

8

MECHANICAL & PACKING PARTS LIST

1 10” Woofer 203400

2 Foot 203410

3 Outer Carton 203420

4 Owner’s Manual 120V 203430

5 Amplifier Complete 203450

6 Foot Screw 203411

Foam corners (package drawing):

7 Top Corner 4/carton 203460

8 Bottom Corner 4/carton 203470

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Amplifier Exploded View

0022

5

1

2

5

6

3

4

LEGEND

1 Dual RCA jack 108324

2 Power Transformer 80135

3 Level Pot 40402

4 Low Pass Filter Pot 40707

5 Fuse Clips (2) 70323

6 1.25A SLO-BLO Fuse (3ag) 80114

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Amplifier Faceplate Parts

Min Max

LEVEL

50 Hz 150 Hz

LFE NORMAL

PHASE 1800

CROSSOVER

FREQUENCY

LINE LEVEL IN

L R

FOR LFE USE L or R

L

HIGH

LIVEL

IN

R

L

HIGH

LIVEL

OUT

R

R

LR

110113

CSA 22-2

UL 1490

120V

60 Hz,

180W

JBL INC. NORTHRIDGE, CA, USA

CAUTIONRISK OF ELECTRIC SHOCK

DO NOT OPEN

NRTL/C

00239

PB10 FACEPLATE

70325

POWER CORD

80105

STRAIN RELIEF

70305

HI LEVEL I/O

OUT

108116

HI LEVEL I/O

IN

108116

LEVEL KNOB

70313

CROSSOVER

FREQUENCY KNOB

70313

LFE DEFEAT

SWITCH

70150PHASE

SWITCH

70150

PB10

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Integrated Circuit Diagrams

U1,U2 (Lm324, TLO64))

2Base

3 Collector

1 Emitter1

23

Q10,Q11 (MPSA56)

2Base

3 Collector

1 Emitter1

23

Q12 (2N4401)

0022

7

D

SG

N-Chan JFET Q1

+6V 15

16

17V+

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 SD

FR 25 11 FR

I/P 26 12 I/P

GND 27 13 GND

-15V 28 14 -15V 0022

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NOTE: THE FOLLOWING PROCEDURES MUST BEFOLLOWED WHEN INSTALLING NEW S53AMI/S64AMIAMP MODULES:

FAILURE TO FOLLOW ONE OR MORE OF THESE STEPSMAY RESULT IN THE INSTANT DESTRUCTION OF THEMODULE WHEN POWERED UP.

1. Align white indent marker on Amp Module with indentmarker on main PCB; alternately observe position of labelon top of the module; incorrectly replacing the Module180° 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 anisolation transformer.

3. Align and position the Amp Module before soldering.

4. Attach the amp Module with the mounting screws beforesoldering or powering up.

5. Use only rosin-core or non-acid core solder; thoroughlyde-flux the surfaces after soldering.

If the new S53AMI/S64AMI Amp Module has larger mountinghole(s) in the case, and the stock screws no longer will fit,and screws of the proper type cannot be obtained locallyorder:

(2) part# 60301S (screws)

(2) part# 60301N (nuts)

S53AMI/S64AMI - Power Amp module SAFETY PART

PB10

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PB10 Testing Procedure

PB10

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PB10 Testing Procedure (Cont.)

PB10

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PB10 Testing Procedure (Cont.)

PB10

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PB10 Electrical Parts ListPB10 POWER AMP section of PCB Version 6.3.

Part # Designator Description

PB10

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PB10 Electrical Parts List (Cont.)PB10 POWER AMP section of PCB Version 6.3.

Part # Designator Description

PB10

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PB10 Electrical Parts List (Cont.)PB10 POWER AMP section of PCB Version 6.3.

Part # Designator Description

PB10

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PB10 Electrical Parts List (Cont.)PB10 PREAMP section of PCB Version 6.3.

Part # Designator Description

PB10

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PB10 PCB’s

PB10

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PCB’s (Cont.)

PB10

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PCB’s (Cont.)

PB10

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Schematics

PB10

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Schematics (Cont.)