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JBL-PB-10-Service-Manual


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         TM
PowerBass Series
PB10 Subwoofer
      SERVICE MANUAL




                  JBL Incorporated
               250 Crossways Park Dr.    REV 0 7/00
              Woodbury, New York 11797
PB10

                             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




                                                             2
PB10

       SAFETY INFORMATION




               3
PB10

       BASIC SPECIFICATIONS PB10 Subwoofer




                        4
PB10

       DETAILED SPECIFICATIONS PB10 Subwoofer




                         5
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
                                                                    Front Panel
     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.                                               Rear Panel
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 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.




                                                                6
PB10

Speaker Connection
When we designed the PB10          examples to determine which          the hole through the
and PB12 powered                   description best matches your        centerpost is visible under the
subwoofers, our goal was to        system and follow the                collar.
offer the user the best possible   corresponding hookup
                                                                        Insert the bare end of the wire
performance combined with          instructions.
                                                                        through the hole in the post,
the most flexible and complete
                                   To use the binding-post              then screw the collar back
installation options. Please
                                   speaker terminals with bare          down until the connection is
look over the following three
                                   wire, unscrew the collar until       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   back of your front left and right
Dolby Pro Logic applications       speakers.
(not Dolby Digital, DTS or         Connect your receiver or
other digital processing),         amplifier's center, left and right
where the receiver/processor       surround-speaker terminals to
does not have a subwoofer          the corresponding terminals on
output or a volume-controlled      the back of your center, left
preamp (line-) level output:       and right surround speakers.
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




                                                   7
PB10

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                                                correctly; Make sure that the
                                     Note: If your receiver or
other digital processing),                                                subwoofer is configured as
                                     amplifier only has one
where the receiver/processor is                                           "On."
                                     subwoofer output jack, then
equipped with a subwoofer
                                     you may connect the                  Note for advanced users: If
output or a volume-controlled
                                     subwoofer output on your             your receiver/processor has a
preamp (line-) level output:
                                     receiver/preamplifier to either      built-in low-pass crossover
Use RCA-type patch cords to          the left or right line-level input   filter for the subwoofer output,
connect the line-level               on the subwoofer. It makes no        then the LFE switch should be
subwoofer outputs on your            difference which jack you            set to the "LFE" position to
receiver or amplifier to the line-   choose.                              bypass the subwoofer's
level inputs on the subwoofer.                                            internal crossover.
                                     Connect each speaker to the
IMPORTANT: Make sure that
                                     corresponding speaker
the LFE toggle switch on the
                                     terminals on your receiver or
subwoofer is in the "Normal"
                                     amplifier.
position. Do not use the "LFE"




                                                     8
PB10

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

Use this installation method for   you may connect the                  The front left, front right, center
Dolby Digital, DTS or other        subwoofer output on your             and rear speakers should be
digital surround processors:       receiver/preamplifier to either      set to "Small" or "Large"
                                   the left or right line-level input   depending on their size and
IMPORTANT: Make sure that
                                   on the subwoofer. It makes no        frequency response. Consult
the LFE toggle switch on the
                                   difference which jack you            your receiver's or processor's
subwoofer is in the "LFE"
                                   choose.                              owner's manual.
position. Use the line-level
input jacks for the low-           Connect each speaker to the
Frequency Effects channel.         corresponding speaker
Connect these jacks to the LFE     terminals on your receiver or
output or subwoofer output on      amplifier.
your receiver or amplifier.
                                   Make sure that you have
Note: If your receiver or          configured your surround-
amplifier only has one             sound processor for
subwoofer output jack, then        "Subwoofer On"or "LFE On."




                                                   9
PB10

OPERATION
Power
When the unit is plugged in        from green to red after the        must be unplugged if you do
and the LEDs on the front of       input signal to the subwoofer is   not wish to leave it in auto
the unit will turn red. When a     removed. Due to JBL's              (standby) mode.
signal is present, the LEDs will   unique, high-output, high-
turn green.                        efficiency amplifier design,
                                   power consumption is minimal
Note: It will take several
                                   when the subwoofer is not
minutes for the LEDs to turn
                                   receiving a signal. The PB10



Level Control
The subwoofer Level Control        room size, subwoofer
adjusts the volume of the          placement, type of main
subwoofer relative to the rest     speakers and listener position.
of the system. Proper level        Adjust the subwoofer level so
adjustments depends on             that the volume of the bass
several variables such as          information is pleasing to you.

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.




                                                 10
PB10

Phase Control


The Phase Control determines      bass output at the listening       If at some time in the future
whether the subwoofer's           position.                          you happen to rearrange your
piston-like action moves in and                                      listening room and move your
                                  Remember, every system,
out in phase with the main                                           speakers, you should
                                  room and listener is different.
speakers or opposite the main                                        experiment with the phase
                                  There are no right or wrong
speakers. There is no correct                                        switch in both positions, and
                                  settings; this switch offers the
or incorrect setting. Proper                                         leave it in the position that
                                  added flexibility to adjust your
phase adjustment depends on                                          maximizes bass performance.
                                  subwoofer for optimum
several variables such as
                                  performance for your specific
subwoofer placement and
                                  listening conditions without
listener position. Adjust the
                                  having to move your speakers.
phase switch to maximize


TROUBLESHOOTING
If you used the high-level        If there is low (or no) bass       If you used the line-level
(speaker) inputs and there is     output:                            inputs and there is no sound
no sound from any of the                                             from the subwoofer:
                                  



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