JBL ESC 550 Source (serv.man4) Service Manual ▷ View online
SERVICE MANUAL
SERVICE MANUAL
Powered Subwoofer
JBL Consumer Products Inc.
80 Crossways Park West
Woodbury, N.Y. 11797
1-800-336-4JBL in the USA
80 Crossways Park West
Woodbury, N.Y. 11797
1-800-336-4JBL in the USA
A Harman International Company
Part No.: 1112-JBLBASS550
BASS550
120 Volt & 230 Volt Versions
1
Powered Subwoofer
BASS550
TABLE OF CONTENTS
Specifications .................................................................1
Features..........................................................................2
Powered Sub Test Setup...............................................2
Test Procedure...............................................................2
Block Diagram ................................................................4
Cabinet AssemblyExploded View .................................5
Packaging Exploded View .............................................5
Amplifier Exploded View ................................................6
Parts Lists.......................................................................7
Revisions ......................................................................10
Printed Circuit Boards .................................................11
Integrated Circuit Diagrams .........................................15
Schematic Diagrams ...................................................16
SPECIFICATIONS
Amplifier Power (RMS)* .
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250 Watts Total
35 x 3 @ 0.1% THD
23 x 1 @ 0.1% THD
100 x 1 @ 0.1% THD
35 x 3 @ 0.1% THD
23 x 1 @ 0.1% THD
100 x 1 @ 0.1% THD
Low FrequencyWoofer (2) .
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SE6H 6-1/2" Poly-Cone Woofer
Design .
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Bass Reflex Enclosure
Inputs .
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RCA Phono plugs at “Source”;
13 pin Din plug to Subwoofer
13 pin Din plug to Subwoofer
Outputs
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(4) Full range Speaker;
(1) Subwoofer
(1) Subwoofer
Crossover FrequencySubwoofer (-6dB) .
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150Hz
FrequencyResponse (-6dB)
System .
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35Hz - 20kHz
Subwoofer .
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35Hz - 150Hz
External Dimensions
Height .
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15-3/4" (400mm)
Width
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8-1/2" (216mm)
Depth .
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20" (508mm)
Weight .
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40 lbs. (18.2 kg)
JBL continuallystrives to improve its products. New materials, production methods and design refinements are introduced into
existing models without notice as a routine expression of our design philosophy. For this reason, the Bass550 Subwoofer may
differ in some respect from its published specifications and descriptions, but will always equal or exceed the original
specifications unless otherwise stated.
existing models without notice as a routine expression of our design philosophy. For this reason, the Bass550 Subwoofer may
differ in some respect from its published specifications and descriptions, but will always equal or exceed the original
specifications unless otherwise stated.
2
Powered Subwoofer
BASS550
FEATURES
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The Bass550 powered subwoofer is part of the ESC550
System.
System.
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Amplifiers for five satellite speakers and subwoofer.
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100 watt output.
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Variable level control.
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Line level input exclusivelyfrom the “Source”.
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User friendly“auto on” circuit. Signal sensing
automaticallyturns the subwoofer on so you don't have
to; the subwoofer is meant to be left “on” without
continuallyusing the power switch.
automaticallyturns the subwoofer on so you don't have
to; the subwoofer is meant to be left “on” without
continuallyusing the power switch.
TEST PROCEDURE
Equipment needed:
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The “Source” AM/FM turner/CD player w/ remote control.
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Function/signal generator/sweep generator.
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Multimeter.
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Cable - Phono plugs (RCA) and speaker cables.
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RCA Y-cable
Subwoofer, General Function
1) Connect both right and left phono jack (RCA) inputs
to signal generator and the “Source” Tape/Aux. input
jacks. Use Y-cable if necessaryfrom mono source.
jacks. Use Y-cable if necessaryfrom mono source.
2) Connect Bass550 subwoofer to the “Source” with
supplied 13 pin Din cable.
BASS550 POWERED SUBWOOFER TEST SETUP
3
Powered Subwoofer
BASS550
3) Plug in subwoofer, turn power switch on; red LED
should light.
4) Turn on generator, adjust to 100 mV, 50 Hz.
5) Push “power” button on the “Source”, (displayshould
now be active); press “Tape/Aux” button, adjust
volume (on Source) so displayreads “VOLUME 30”.
volume (on Source) so displayreads “VOLUME 30”.
6) Turn up level control on subwoofer full clockwise.
7) LED on subwoofer should cycle to green; bass
response should be heard and felt from port tube
opening.
opening.
Subwoofer, Sweep Function
1) Follow steps 1-7 above, using a sweep generator as a
signal source.
2) Sweep generator from 20Hz to 300Hz. Listen to the
cabinet and drivers for anyrattles, clicks, buzzes or
anyother noises. If anyunusual noises are heard,
remove driver and test.
anyother noises. If anyunusual noises are heard,
remove driver and test.
Subwoofer, Driver Function
1) Remove one or both drivers from cabinet; remove +
and - wire clips.
2) Check DC resistance of driver; it should be
approximately5.8 ohms.
3) Connect a pair of speaker cables to driver terminals.
Cables should be connected to an integrated amplifier
fed bya signal generator. Turn on generator and
adjust so that speaker level output is 4.0V.
fed bya signal generator. Turn on generator and
adjust so that speaker level output is 4.0V.
4) Sweep generator from 20Hz to 1kHz. Listen to driver
for anyrubbing, buzzing, or other unusual noises.
System, General Function
1) Connect Bass550 subwoofer to the “Source” with
supplied 13 pin Din cable.
2) Attach all five satellite speakers to the supplied
speaker cables, terminating in a molex connector
plugged into the subwoofer.
plugged into the subwoofer.
3) Plug in Bass550 subwoofer, turn power switch on; red
LED should light.
4) Push “power” button on the “Source”; (displayshould
now be active).
5) Toggle “surround mode” button on front panel or with
remote control until “NORMAL” appears.
6) Toggle “rear speaker”button on front panel until
“REAR SPEAKERS” is displayed in upper left corner.
7) Adjust volume (on Source) so displayreads
“VOLUME 30”.
8) Using remote control, press “TONE” button.
9) White noise should be heard, cycling from Left,
Center, Right and Rear speakers in succession.
10)Press “TONE” button again to halt test.
