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Summary of Contents for Harman JBL BASS20
- Page 1 BASS20 Powered Subwoofer SERVICE MANUAL 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-JBLBASS20...
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Page 2: Table Of Contents
Powered Subwoofer BASS20 TABLE OF CONTENTS Specifications ..............1 Cabinet Assembly Exploded View.........7 Features................1 Parts Lists...............8 Powered Sub Test Setup..........2 Packaging View............10 Test Procedure...............3 Printed Circuit Boards ..........11 Important Service Note ..........4 Integrated Circuit Diagram ...........13 Block Diagram ..............5 Schematic Diagrams ...........14 Amplifier Exploded View ..........6 SPECIFICATIONS Amplifier Power (RMS) . -
Page 3: Powered Sub Test Setup
Powered Subwoofer BASS20 BASS 20 POWERED SUB WOOFER TEST SETUP 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, Bass Series loudspeakers may differ in some respect from their published specifications and descriptions, but will always equal or exceed the original specifications unless otherwise stated. -
Page 4: Test Procedure
Powered Subwoofer BASS20 TEST PROCEDURE Equipment Needed: Function generator/signal generator/sweep generator Integrated Amplifier Multimeter Cables - Line level (RCA) and Speaker cables UUT = Unit Under Test General Function Connect both left and right line level inputs (RCA) to signal generator and UUT. Use Y-cable if necessary from mono source. -
Page 5: Important Service Note
Powered Subwoofer BASS20 IMPORTANT SERVICE NOTE: Amplifier assemblies with serial numbers less than 11757 should be modified for safe operation. Examine amplifier as follows (serial #11756 or lower) to determine if a factory modification has taken place: Unplug and remove amp assembly; (12) #8 x 3/4" screws. Lift and examine the main (large) amp board, solder (green) side of the board. -
Page 6: Block Diagram
Powered Subwoofer BASS20 BASS 20 (120v US & 230v European Versions) BLOCK DIAGRAM... -
Page 7: Amplifier Exploded View
Powered Subwoofer BASS20 BASS20 (120V & 230V versions) AMPLIFIER EXPLODED VIEW... -
Page 8: Cabinet Assembly Exploded View
Powered Subwoofer BASS20 BASS20 CABINET ASSEMBLY EXPLODED VIEW... -
Page 9: Parts Lists
Powered Subwoofer BASS20 BASS 20 PARTS LIST MECHANICAL PARTS LIST REF. NO. PART NO. DESCRIPTION C14, 16 CP1426 SMD CAP 0.1uF 20% 50V Z5U P REF. NO. PART NO. DESCRIPTION CP1479 SMD CAP 3300pF 10% 100V X PI BR1187 ALUM. BAR 4.8mmx12.7mmx40m C19, 28 CP1645 CAP AL EL 22uF 20% 63V 85 PI... - Page 10 Powered Subwoofer BASS20 REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION R26, 28 RS1717 SMD RES 100Ω 5% 1/8W 12 P Miscellaneous RS1716 SMD RES 33.2K 1% 1/8W 120 P SA0000042 AIR CORE INDUCTOR 1.8uH MI RS1711 SMD RES 220Ω 5% 1/8W 12 P LED1 LE1032 LED BICOLOR RED/GREEN 5mm.
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Page 11: Packaging View
Powered Subwoofer BASS20 BASS20 PACKAGING VIEW (MUSIC20 & SCS120) -
Page 12: Printed Circuit Boards
Powered Subwoofer BASS20 PRINTED CIRCUIT BOARDS (TOP VIEW) - Page 13 Powered Subwoofer BASS20 PRINTED CIRCUIT BOARDS (BOTTOM VIEW)
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Page 14: Integrated Circuit Diagram
Powered Subwoofer BASS20 INTEGRATED CIRCUIT DIAGRAM... -
Page 15: Schematic Diagrams
Powered Subwoofer BASS20 120V SCHEMATIC DIAGRAM... - Page 16 Powered Subwoofer BASS20 230V SCHEMATIC DIAGRAM...
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