JBL BASS-550 Service manual

SERVICE MANUAL

BASS550

Powered Subwoofer

120 Volt & 230 Volt Versions

SERVICE MANUAL

JBL Consumer Products Inc. 80 Crossways Park West Woodbury, N.Y. 11797 1-800-336-4JBL in the USA

A Harman International Company

Part No.: 1112-JBLBASS550

Powered Subwoofer BASS550

TABLE OF CONTENTS

Specifications .................................................................1

Features..........................................................................2

Powered Sub Test Setup...............................................2

Test Procedure ...............................................................2

Block Diagram ................................................................4

Cabinet Assembly Exploded View.................................5

Packaging Exploded View .............................................5

SPECIFICATIONS

Amplifier Power (RMS)* ........250Watts Total

Low Frequency Woofer (2) .......SE6H 6-1/2" Poly-Cone Woofer

Design ..............Bass Reflex Enclosure

Inputs ..............RCAPhono plugs at “Source”;

Outputs .............(4)Full range Speaker;

Crossover Frequency Subwoofer (-6dB) . . . 150Hz

Frequency Response (-6dB)

System .............35Hz - 20kHz

Subwoofer ............35Hz - 150Hz

External Dimensions

Height .............15-3/4" (400mm)

Width .............8-1/2" (216mm)

Depth .............20"(508mm)

Weight ..............40lbs. (18.2 kg)

Amplifier Exploded View ................................................6

Parts Lists.......................................................................7

Revisions ......................................................................10

Printed Circuit Boards .................................................11

Integrated Circuit Diagrams .........................................15

Schematic Diagrams ...................................................16

35x3@0.1% THD 23x1@0.1% THD 100x1@0.1% THD

13 pin Din plug to Subwoofer

(1) Subwoofer

JBL continually strives 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.

1

Powered Subwoofer BASS550

FEATURES

The Bass550 powered subwoofer is part of the ESC550

n

System.

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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BASS550 POWERED SUBWOOFER TEST SETUP

Line level input exclusively from the “Source”.

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User friendly “auto on” circuit. Signal sensing

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automatically turns the subwoofer on so you don't have to; the subwoofer is meant to be left “on” without continually using 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 necessary from mono source.

2) Connect Bass550 subwoofer to the “Source” with supplied 13 pin Din cable.

2

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”, (display should now be active); press “Tape/Aux” button, adjust volume (on Source) so display reads “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.

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 any rattles, clicks, buzzes or any other noises. If any unusual noises are heard, remove driver and test.

Subwoofer, Driver Function

1) Remove one or both drivers from cabinet; remove + and - wire clips.

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.

3) Plug in Bass550 subwoofer, turn power switch on; red LED should light.

4) Push “power” button on the “Source”; (display should 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 display reads “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.

2) Check DC resistance of driver; it should be approximately 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. Turn on generator and adjust so that speaker level output is 4.0V.

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

3

Powered Subwoofer BASS550

BASS550 (120v US & 230v European Versions) BLOCK DIAGRAM

4

Powered Subwoofer BASS550

BASS550 CABINET ASSEMBLY & PACKAGING EXPLODED VIEWS

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Ref # Part No. Description Qty.

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9 FH1002 Fuse Holder 1/4x1-1/4 1

10 XX1174 1

13

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AG AC Cord 6ft. UL/CSAaprov. 120v

AG AC Cord 6ft. UL/CSAaprov. 230v 1

WI1597 11 HS1142 Heatsink Internal 1 12 MI1151 AG Power Transformer 120v 1

AG Power Transformer 230v 1

M1159

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13 ST1025 Round Spacer 1/2x3/8 length 6 14 SW1075 JR Switch Rocker 2P2T Snap-I 1 15 XX1259 Knob Black (not shown) 1

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16 XX1269 Gasket 1 17 XX1276 Plastic Cover 1 18 NU1059 Nut 4-40 Keps-Thr. Hexag. Zinc 2 19 NU1057 Nut 6-32 Keps Zinc Hexag. 2 20 NU1049 Nut 8-32x1/4 Keps Hexag. 5

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21 WA1049 Washer Ext. Tooth #6 Zinc 10

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22 WA1080 Washer Flat #8 Steel Zinc 5 23 XX1250 Strain Relief SPT-1 Black 1

Ref # Part No. Description Qty.

1 BR1187 Alum. Bar 4.8x12.7x40mm 4 2 BR1386 Transistor Bar TO-218 2 3 BR1395 Bracket Power Support 6 4 BR1411 Bracket Support 60 Deg 1 5 BR1421 Bracket "L" 0.9"x0.9" 1 6 BR1423 Front Plate 1 7 BR1495 Alum. Bar 1 8 FS1078 Fuse 6A 250V 3AG Slow Blow 1

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24 SC1253 Screw 4-40x3/8 Pan Phillips 2 25 SC1274 Screw 5-20x1/4 Thread Form. Z. 6 26 SC1192 Screw 6-32x3/4 Cutt-Thr. Hex. 8 27 SC1194 Screw 6-32x3/8 Tapt-Thr Hex. 17 28 SC1282 Screw 10-32x7/8 Pan-Torx Hd. 6 29 SP1073 Sil Pad TO-3P 1/0"x0.75" 12 30 SP1072 Sil Pad TO-220 0.750" 3 31 ST1024 1/4 Hex Fem. Standoff 1-1 2

332630-001 13

32 Pin Interconnect Cable 1

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ass550 Amplifier Exploded View

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Ref # Part No. Description Qty.

1 BR1187 Alum. Bar 4.8x12.7x40mm 4 2 BR1386 Transistor Bar TO-218 2 3 BR1395 Bracket Power Support 6 4 BR1411 Bracket Support 60 Deg 1 5 BR1421 Bracket "L" 0.9"x0.9" 1 6 BR1423 Front Plate 1 7 BR1495 Alum. Bar 1 8 FS1078 Fuse 6A 250V 3AG Slow Blow 1

EF

Ref # Part No. Description Qty.

9 FH1002 Fuse Holder 1/4x1-1/4 1

10 XX1174 1

WI1597 11 HS1142 Heatsink Internal 1 12 MI1151 AG Power Transformer 120v 1

M1159 13 ST1025 Round Spacer 1/2x3/8 length 6 14 SW1075 JR Switch Rocker 2P2T Snap-I 1 15 XX1259 Knob Black (not shown) 1

6x

16 XX1269 Gasket 1 17 XX1276 Plastic Cover 1 18 NU1059 Nut 4-40 Keps-Thr. Hexag. Zinc 2 19 NU1057 Nut 6-32 Keps Zinc Hexag. 2 20 NU1049 Nut 8-32x1/4 Keps Hexag. 5 21 WA1049 Washer Ext. Tooth #6 Zinc 10 22 WA1080 Washer Flat #8 Steel Zinc 5 23 XX1250 Strain Relief SPT-1 Black 1 24 SC1253 Screw 4-40x3/8 Pan Phillips 2 25 SC1274 Screw 5-20x1/4 Thread Form. Z. 6 26 SC1192 Screw 6-32x3/4 Cutt-Thr. Hex. 8 27 SC1194 Screw 6-32x3/8 Tapt-Thr Hex. 17 28 SC1282 Screw 10-32x7/8 Pan-Torx Hd. 6 29 SP1073 Sil Pad TO-3P 1/0"x0.75" 12 30 SP1072 Sil Pad TO-220 0.750" 3 31 ST1024 1/4 Hex Fem. Standoff 1-1 2

332630-001 13

32 Pin Interconnect Cable 1

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AG AC Cord 6ft. UL/CSA aprov. 120v

AG AC Cord 6ft. UL/CSA aprov. 230v 1

AG Power Transformer 230v 1

HI

9

10

11

12

13

14

Bass550