JBL PB-10 Service manual

PowerBass™ Series

PB10

Powered Subwoofer

Service Manual

JBL Consumer Products 250 Crossways Park Dr.

Woodbury, New York 11797 Rev7 2/2004

PB10 TABLE OF CONTENTS

PB10 – DIFFERENCES IN REVISION 1 AND REVISION 2

REVISION 1 REVISION 2

Amplifier has main power switch Amplifier faceplate says “Made in Canada” Amplifier serial number starts with “AM” Amplifier serial number starts with “HA” Black (or silver) potted, non-serviceable output module Output transistors in the open, on a large black heatsink

Large plastic cup enclosing the rear of the amp assembly

Main PCB, bottom, solder-side contains all SMD devices

“Made in Mexico” label on outer part of cabinet

BOTH VERSIONS OF THESE AMPLIFIERS ARE NOT CONSIDERED INTERCHANGEABLE; THEY ARE NOT A DROP-IN REPLACEMENT IN THE CABINET OF THE OTHER VERSION.

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 Service Bulletin JBL 2001-03 …………………………………………………….13 Service Bulletin JBL 2001-04 …………………………………………………….14 Tech Tip JBLTT2003-04…………………………………………….…………….17 Exploded View/Packaging ..………………………………………...…………….18 Amplifier Exploded View ………………………………………………………….19 Amplifier Faceplate/Access…………………………………….…………………20 Integrated Circuit Diagrams……………………………………………………….21 Testing Procedures..………………………………….……………………………22 Block Diagram Revision 2…………………………………………………………29 Electrical Parts List (PCB version 6.3 – 7.0)……………… ………..………….30 Electrical Parts List (PCB version 7.2) …………………………...………..……34 Electrical Parts List Revision 2……………………………………..…………….38 Printed Circuit Boards (PCB version 6.3 – 7.0)…… ………………...…..…….41 Printed Circuit Boards (PCB version 6.4)………..… ………………...…..…….44 Printed Circuit Boards (PCB version 7.2)…… ……...………………………….45

Schematics Version 1

Preamp (PCB version 6.3 – 7.0)……………… …………… ………….48 Power Amp (PCB version 6.3)………………… ……………….……….49 Power Amp (PCB version 7.0)…………………………..……………….50 Preamp (PCB version 7.2)……………….…………….……….. ……….51 Power Amp (PCB version 7.2)………………… ……….……………….52

Schematics Version 2……………………………………..…………………….…53

PB10

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

Early revisions of the unit did not have a power switch. Hazardous voltages are resent within the unit whenever it is plugged in.

Before 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 or resistance test as follows:

Leakage Current. Note there is no power switch on early revisions of 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 schematic diagram designate components in which safety can be of special significance when

replacing identified with. Use only the replacement parts designated in the parts list or parts with the same rating of resistance, wattage or voltage.

SAFETY INFORMATION

List of Safety Components Requiring Exact Replacements

Revision 1 Revision 2 Description

F1 - 80114 093-205209-300 Line Fuse Slo Blo 1.25A

5x20mm

PWRCORD 083-041802-009 250V UL approved SPT-2 80105 or better with polarized

plug, UL approved wired with the hot side to fused side. Use with factory replacement panel strain relief (70305) only.

TRX 042-010052-003 Power Transformer. 80135 Use only factory

replacement.

BR RECT BR1 Bridge diode. Use only 50100 052-400080-000 factory replacement.

C1,2 C6,8 4700uF 50V electrolytic 30706 034-470745-200 filter caps. Be sure

replacement part 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 Does not apply 10uF, 100 volt NPE low 30712 df radial. (On Power

amp PCB)

S64AMI Does not apply Power output module. 60301 Use only factory

replacement

Faceplate n/a Use only factory 70325 replacement

Rear Amp Cover 063-531808-000 Use only factory

replacement

Inductor Does not apply CMC - Use only factory 80100 replacement

Inductor Does not apply L1 - Use only factory 80101 replacement

Does not apply Inductor L1 - Use only factory

043-560200-000 replacement

Does not apply Inductor L2 - Use only factory

043-300101-000 replacement

Does not apply Inductor L3 - Use only factory

043-700101-000 replacement

Does not apply Inductor L4 - Use only factory

043-324300-000 replacement

PB10

BASIC SPECIFICATIONS PB10 Subwoofer

Output Power

Driver

Frequency Response

Inputs

Outputs

Low-Pass Frequency

High-Pass Frequency

Dimensions (H x W x D)

Weight

150 watts RMS

10" Woofer

27Hz – Low

Pass Frequency setting

Line Level (option: LFE); Speaker Level

Speaker level fixed frequency 150Hz

Variable from 50Hz – 150Hz

150Hz when using Speaker Level Output

14" x 14" x 15" 356mm x 356mm x 381mm (with feet) 16" x 14" x 15" 406mm x 356mm x 381mm

35 lb/15.9kg

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 re

istered trademark of JBL, Incorporated.

00232-1

PB10

mits

@ Sp

(BW=20 KHz)

(

signal applied

emoved

@ Sp

DETAILED SPECIFICATIONS PB10 Subwoofer

JBL PB 10

LINE VOLTAGE Yes/No Hi/Lo Line Nom. Unit

Parameter Specification Unit

Amp Section

Type (Class AB, D, other) D n/a

Load Impedance (speaker) 4 Ohms

Rated Output Power 150 Watts

THD @ Rated Power 0.3 %

THD @ 1 Watt 0.1 %

DC Offset 10 mV-DC

Damping factor 50 DF

Input Sensitivity

Input Frequency 50 Hz

L&R 128 mVrms

LFE 128 mVrms

Speaker/Hi Level Input 1.28 Vrms

Signal to Noise

SNR-A-Weighted 100 dBA

SNR-unweighted 80 dBr

SNR rel. 1W-unweighted 65 dBr

Residual Noise Floor 1 mVrms

Residual Noise Floor 1.5 mVrms(max)

Input Impedance

Filters

Speaker in LP 2nd order variabl

Subsonic filter

LFE Low pass 2nd order fixed 200>LP<1K Hz

Speaker out HP filter

Left & Right 200 Hz

Left & Right 100 Hz

Limiter

Signal Sensing (ATO)

Auto-Turn-On (yes/no) YES

ATO Input test frequency 50 Hz

ATO Level LFE Input 4 mV

ATO Level Speaker in 50 mV

ATO Turn-on time 5 ms

Auto Mute/ Turn-OFF Time 15 minutes

Power on Delay time 3 sec.

Transients/Pops

ATO Transient 5 mV-peak

Turn-on Transient 50 mV-peak

Turn-off Transient 50 mV-peak

Efficiency 65 %

Stand-by Input Power 15 Watts

Power Cons. @ rated power 115 Watts

Protection

Short Circuit Protection YES

Thermal Protection YES

DC Offset Protection YES

Line Fuse Rating US version Amps

US 120vac/60Hz Yes 108-132 120 Vrms

EU 230vac/50-60Hz Yes 207-264 230 Vrms

Line Input 20K ohms

Speaker/Hi Level Input 4.7K ohms

HPF) fixed 6th o Fixed

150W Powered Sub Amp

60-150 Hz

YES

EU Amps

QA Test

n/a

Nominal

n/a

1 in

22k filter

0.5

Nominal Fre

±2dB

70-75

70-80

2 - 2.8 Volume @max, using DVM or A/P

2 - 2.8 Volume @max, w/ A/P Swept

functional

functional Amp connected and AC on, then input

2v-

functional

To 75 Watts

relative to rated

relative to 1W Out

Bandpass Measurement (Line freq.+

Nominal

n/a

Nominal

n/a

± 10

Single input driven

± 10 S

17 T before muting, after signal is

n/a

120

1.5

TBD

eaker input - Spkr out 4 Ohms

eaker input - Spkr out 8 Ohms

Auto - on selection switch in Auto

AC Power Applied

Speaker Outputs

@ nom. line voltage

nom. line voltage

Direct short at out

1/8 max unclipped Power

e-T or Slo Blo-250 V

Conditions

ut driven

eaker Outputs

ower

eaker Outputs

resent at Speaker Out leads

PB10

PB10 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 PB10 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, PB10,

(located on the rear panel) adjusts the volume of the subwoofer relative to the rest of the system.

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.

5. Crossover Frequency - Sets the highest frequency

the subwoofer will reproduce.

6. Line Input - Main Input connection to subwoofer

(preferred).

7. Speaker In Jacks - Main Input connection to

subwoofer when line level, subwoofer, or preamp 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.

Rear Panel

Front Panel

PB10

Speaker Connection

When we designed the PB10 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 center

post 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 (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

+ –

Left Front Center

+ – + –

Left Surround

+ –

Center

+ –

Subwoofer

+ –

Receiver

HIGH

LEVEL

HIGH

LEVEL

OUT`

Right Surround

Right SurroundLeft Surround

Right Front

+ –

Right Front

+ –

PB10

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 linelevel 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” position with Dolby Pro Logiconly processors.

Note: If your receiver or amplifier only has one subwoofer output jack, then you may connect the subwoofer output on your receiver/preamplifier to either the left or right line-level input on the subwoofer. It makes no difference which jack you choose.

Connect each speaker to the corresponding speaker terminals on your receiver or amplifier.

Make sure 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 inter nal crossover.

RECEIVER

Subwoofer

Out

L R

LEVEL

CROSSOVER FREQUENCY

LINE LEVEL IN

+ –

Min

LFE NORMAL

0º 180º

PHASE

50Hz

L R

For LFE use L or R

HIGH

LEVEL

HIGH

LEVEL

OUT

Max

150Hz

PB10

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 LowFrequency Effects channel. Connect these jacks to the LFE output or subwoofer output on your receiver or amplifier.

Connect each speaker to the corresponding speaker terminals on your receiver or amplifier.

Make sure that you have configured your surroundsound processor for “Subwoofer On” or “LFE On.” 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.

LEVEL

Min

Max

LFE NORMAL

RECEIVER/PREAMPLIFIER

Subwoofer Output/LFE

CROSSOVER FREQUENCY

LINE LEVEL IN

+ –

0º 180º

PHASE

50Hz

L R

For LFE use L or R

HIGH

LEVEL

HIGH

LEVEL

OUT

150Hz

PB10

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 signal to the subwoofer is removed. Due to JBL’s unique, high-output,

high-efficiency amplifier design, power consumption is minimal when the subwoofer is not receiving a signal. Of course, the subwoofer can be turned off, whenever desired.

NOTE: Early versions of the PB10 did not have a main Power switch.

The subwoofer Level Control adjusts the volume of the subwoofer relative to the rest of the system. Proper level adjustment depends on several variables such as 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.

Level Control

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 control to a higher setting, between 120Hz – 150Hz. This control is not used when the LFE switch is in the “LFE” position.

LEVEL

CROSSOVER FREQUENCY

PowerBass PB10

LINE LEVEL IN

+ –

ON OFF

POWER

PowerBass PB10

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

Min

LFE NORMAL

0º 180º

PHASE

50Hz

L R

For LFE use L or R

HIGH

LEVEL

HIGH

LEVEL

OUT

Max

150Hz

120V

60Hz

PB10

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 listener position. Adjust 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. If 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.

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 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 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 switched on.*

• Adjust the crossover point.

• Flip the Phase Control switch to the opposite position.

• If you are using a Dolby Digital/DTS receiver or processor, make sure that the subwoofer adjustments on the receiver/processor are set up correctly.

• Slowly turn the Level Control clockwise until you begin to hear the desired amount of bass. Make sure that the subwoofer is plugged into an active electrical outlet and switched on.*

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.

• 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.

*NOTE: Early versions of the PB10 did not have a main Power switch.

PB10

PB10 TEST SETUP AND PROCEDURE

Min Max

LEVEL

50 Hz 150 Hz

LFE NORMAL

PHASE 1800

CROSSOVER FREQUENCY

LINE LEVEL IN

FOR LFE USE L or R

HIGH

LIVEL

HIGH

LIVEL

OUT

00229

CD PLAYER

PRE AMP

AMPLIFIER

AC VOLT

METER (6V)

LINE LEVEL

PB10 or PB12 UNDER TEST

SPEAKER

LEVEL

FROM

LINE-LEVEL

SOURCE

SPEAKER

OUTPUT

FROM

AMPLIFIER

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. VOLUME control should be full conterclockwise.

2. Tur n on generator, adjust to 100mV, 50Hz.

3. Plug in UUT; Turn Main Power switch ON (present on later version PB10 only). 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 (150Hz).

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

5. Tur n 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 an integrated amplifier fed by the signal generator.

7. Tur n on generator and adjust so that speaker level output is 1.0V, 50Hz. 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 other noises. 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 by a 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

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 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 (22kΩ). See illustration. These parts must be “swapped”, i.e., R42

soldered into the D10 location, and D10 soldered into the R42 location. VERY IMPORTANT: Observe

polarity on D10 in new location.

5) Replace amplifier; test subwoofer to assure the unit goes into the standby mode 10 - 15 minutes after

removing the Audio input signal.

Mode l S e r i al num be r S ta tus Ac ti on

PB10 *

PB12 *

Al l ser i al number s

af f ect ed

Unit may not switch to Standby mode

Swap locations:

Zener Diode D10,

Resistor R42 (22kΩ).

Observe D10 polarity.

* Revision 1 of the PB10/12: Amplifier faceplate says “Made in Canada”; Amplifier serial number starts with “AM”

Black (or silver) potted, non-serviceable S53/64AMI output module. PB10 only – No Power switch

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 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 effective solution:

A) Audible Hum with unit on, Green LED is ON, hum disappears completely when the connecting input cables (RCA or

Speaker-Level) are disconnected:

Very long runs of line-level input cables, particularly in parallel with AC power cords, may induce hum in the

audio cables. Check audio cables for defects, broken ground connections, or replace low quality cables. Try plugging the AC power cord from the subwoofer into a different AC service outlet other than the outlet the rest

B) Mild Audible Hum under all circumstances when power cord is plugged in outlet. Hum level does not change

This may be a mechanical hum caused by the power transformer. Note that a slight hum, within design limits,

C) Loud Hum, under all circumstances. It may be louder when LED’s are Green vs. Red ; it may be affected by the

Reset the digital subwoofer amplifier by unplugging the AC power cord. Wait 30 seconds, then plug the cord

For #B only - If the unit still does not function correctly, then check and replace main Power Supply

Both Value and df should be checked, with a GenRad model 1657 Digibridge or equivalent Value should be the rating listed below, within this tolerance: A df value of higher than 15% (.15) should be considered defective.

PB10 PB12

For #C only - If the unit still does not function correctly, then replace Power Amp Module S53/64AMI as per instructions below: PB10: JBL part# 60301

1) Set the unit on a padded surface and remove all external cables.

2) On the amplifier faceplate, remove the (10) Phillips mounting screws around the perimeter.

3) Remove the amplifier assembly from the enclosure. If the amp is supported correctly, no other connectors need to

4) Locate the Power Amp Module S53/64AMI, see location on the following page. It is the large black or gray

5) Replace the amplifier assembly back into the cabinet; replace the screws.

6) Test the unit and confirm the original problem has been corrected. NOTE: THE PB10/12 REVISION 1 AMPLIFIER

of the audio equipment is plugged into.

whether the LED’s are Red or Green, or input cables are connected or disconnected. Level control adjustments do not change the hum level.

may be noticeable in a very quiet room, when you are close to the unit. This is acceptable within the PB10/12’s product and price category to most customers, but not to others. If the mechanical hum is unacceptable to the customer, then replace Power Transformer. PB10: JBL part# 80135. PB12: JBL part# 80116

position of the Level control. The subwoofer may “thump” or “pop” approximately every 10 seconds.

back in. Repeat this 2-3 times if necessary.

capacitors C1 and C2.

+80/-20 %

4700 µF 50v 105c 2200 µF 100v 105c

be unplugged.

component with a metal case. On the solder side of the circuit board are 28 soldered connections. NOTE: See special handling instructions for S53/64AMI on the following page.

MUST ALWAYS BE TESTED WITH A WOOFER OR 4 OHM RESISTIVE LOAD.

JBL part# 30706 JBL part# 30710

PB12: JBL part# 60302

JBL Incorporated 250 Crossways Park Dr. Woodbury, New York 11797 (516) 496-3400

PB10/12 Revision 1 Only

MODEL

Serial numbers are located on the cabinet directly below

PB10

PB12 Hum, Buzz or “Thumping”

* Revision 1 of the PB10/12: Amplifier faceplate says “Made in Canada”; Amplifier serial number starts with “AM”

See serial numbers on Page 3 for factory

Serial Number (120v)

the amplifier faceplate.

modified units

STATUS ACTION

Hum, Buzz or “Thumping”

Replace Power Amp Module S53AMI

for symptoms described in #C only

Replace Power Amp Module S64AMI

for symptoms described in #C only

Black (or silver) potted, non-serviceable S53/64AMI output module. PB10 only – No Power switch

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 24905-24907 14674 24909 14822 24913-24914 15092 24919 15525 24924 15634 24926 15644-15645 24928-24929 15649 24931-24932 15654 24934 15657 24936 15659 24939 15662 24944 15673-15674 24948 15676-15677 24950 15679 24960 15681 24986 15683 24988 15692 24991 15696 24994 15702 24996 15705 24998 16413 25001 17723 25003-25005 17740 25007 18274 25015 19665 25018 20470 25020 21026 25025 21124 25029-25030 21126 25033 21637 25037 22892 25039 22894-22895 25041 22901 25043-25056 22905-22906 25058-25115 22908 25117 22913 25119-25142 22917 25144-25147 22927 25149-25152 22933 25154-25156 25158-25159 25436 25161 25691 25164 25694 25168 25698-25699 25171 25704 25174 25706 25179 25710 25185 25712-25713 25187 25715-25719 25189 25721-25730 25194 25732 25214 25734 25218-25219 25735 25229 25737-25739 25234-25236 25742-25745 25238-25243 25747-25770 25247-25249 25772-25777 25251-25252 25779-25791 25256-25257 25793-25833 25261-25263 25835-25845 25265-25267 25847-25850

25270-25272 25852-25864 25276 25866-25868 25278-25291 25870 25294-25297 25874-25881 25300 25883-25886 25302-25303 25888 25306-25307 25890-25891 25309 25893-25894 25311 25896-26000 25313-25314 26002-26012 25333-25334 26014-26076 25341 26079 25345 26081 25347-25348 26083 25351-25352 26086-26087 25358 26089-26091 25360-25361 26093-26094 25363-25364 26096-26097 2536825369 26099-26101 25371 26103-26104 25375 26106 25384-25386 26108 25391-25392 26110 25394 26112 25396 26115 25399 26118-26119 25402 26121-26124 25406 26126 25408 26128 25416 26130-26131 25419 26133-26134 25421 26136-26137 25426 26139 26141-26150 26522 26152- 26172 26525 26174 26528 26176-26185 26531 26187-26197 26533 26198-26201 26536 26203 26540-26541 26206 26543-26544 26209 26546-26554 26211 26556-26557 26213-26214 26560 26217 26565 26235 26568 26238 26573 26242 26587 26244 26599 26246 26604 26251-26252 26614-26615 26254-26255 26624-26625 26266 26627 26273 26629 26278 26632 26282 26638 26286 26641-26643 26384 26645 26388 26655 26390-26391 26658 26399-26400 26662 26402 26665 26405-26406 26669 26408-26409 26671 26411 26673 26413-26415 26675-26677 26417 26680 26419 26686 26421 26692-26694 26432 26696-26697 26438-26439 26700 26443 26702 26451-26452 26706 26457-26458 26708 26460-26462 26713-26716

26465 26718-26720 26474 26722-26725 26477 26729-26730 26479-26480 26732-26743 26483 26745-26747 26486 26750 26498 26752-26753 26503 26755 26510-26512 26757-26759 26514 26762-26768 26517 26770-26771 26520 26773-26778 26781 27376-27399 26783 27401-27503 26786 27532 26789 27553 26791 27624-27647 26793 27649-27698 26795-26797 27701-27720 26799-26801 27722-27769 26804 27771-27774 26807 27776-27852 26810 27854-27866 26813 27868-27911 26815-26816 27913-27999 26820 28001-28067 26822 28069 26825 28070 26827 28072-28073 26829 28075 26833-26834 28078 26838 28087 26840 28092-28094 26843 28096-28097 26844 28099 26846 28101-28102 26850 28105 26857 28108 26874 28110-28114 26876-26880 28116-28117 26882 28119-28120 26885-26886 28122-28123 26888-26894 28125 26913 28130-28131 26915-26917 28133 26922-26935 28137 26967 28140-28150 26984-27001 28152-28158 27010-27033 28160-28161 27100 28167 27103-27104 28172 27122-27126 28177 27142-27143 28181 27148-27149 28184 27151 28186-28187 27153 28193 27190 28196 27192 28202-28203 27196-27273 28207 27275-27277 28211 27279-27312 28215 27314-27329 28217-28218 27331-27351 28220-28221 27353-27370 28223 27372 28227 27374 28231-28234 28236-28237 29792-29860 28239-28241 29862-29915 28243 29917-30062 28245 30064-30133 28250 30152-30288 28256 30290-30345 28259 30347-30413 28264-28267 30415-30490 28270-28271 30492-30524

28283 30526-30533 28286 30535-30625 28288 30627-30649 28291 30651-30686 28293-28294 30688-30748 28296 30750-30930 28298 30932-31025 28300 31027-31072 28302-28303 31074-31123 28305-28331 31125 28333-28343 31127-31139 28345-28354 31256 28369 31771 28379-28689 35089 28691-28697 35733 28699-28708 36186 28710-28715 37400 28717-28720 39339 28722-28724 80749 28726-28731 28734 28736 28738-28740 28742-28744 28746-28750 28752-28754 28756-28821 28823-29130 29132-29142 29144-29219 29221-29276 29278-29280 29282-29327 29329-29338 29340-29379 29381-29389 29391-29451 29453-29455 29457 29459-29528 29530-29531 29533-29605 29607-29624 29626-29634 29636-29790

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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# FE106401110 or only the brands: International Rectifier, or Fairchild.

Replace both

Do NOT mix & match these components from different manufacturers, or batches. They should be

identical.

Q18 and Q22 MOSFET’s in the circuit, even if only one seems to be damaged.

* Late version PB10 or PB12 subwoofers (Revision 2 in the service manual) can be identified by:

• Amplifier serial number starts with “HA”

• Output transistors in the open, on a large black heatsink

• Large plastic cup enclosing the rear of the amp assembly

• Main PCB, bottom, solder-side contains all SMD devices

+ 37 hidden pages

JBL PB-10 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual