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JBL LS Series User Manual

JBL LS Series
33 pages
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LS
Series
LS120P
Amplifier/Subwoofer
SERVICE MANUAL
JBL Consumer Products
250 Crossways Park Dr.
Woodbury, New York 11797 Rev0 4/2008
Released 2008
Discontinued XXXX

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JBL LS Series Specifications

General IconGeneral
TypePowered Subwoofer
Enclosure TypeBass Reflex
Woofer Size12 inch
Amplifier Power300W RMS
InputsLFE

Summary

LS120P Specifications

Key Product Specifications

Details amplifier power, driver, frequency response, and dimensions.

Technical Parameter Tables

Comprehensive data on line voltage, amp section, filters, and protections.

LS120P Package

Package Contents

Lists all items included in the product packaging.

Controls and Connections

Rear Panel Interface

Diagram and description of the subwoofer's rear panel controls and inputs.

System Connections

Connection Examples

Illustrates how to connect the subwoofer to audio sources.

Operation

Power, Standby, and Level Adjustment

Instructions for powering on, standby modes, and adjusting volume for optimal bass.

Phase and Crossover Settings

Guidance on phase and crossover controls for sound tuning.

Exploded View and Parts List

Component Breakdown Diagram

Visual breakdown of components for service and identification.

Parts Identification List

List of part numbers and descriptions for replacement.

Test Procedures

System and Driver Testing

Procedures for system aural sweep and individual driver tests.

Block Diagrams

Preamplifier, EQ, Auto Off Block Diagram

Schematic of the preamplifier, EQ, and auto-off circuits.

Power Amp and Protection Block Diagram

Schematic of the power amplifier, source, and protection circuits.

Troubleshooting Flow Chart

Amplifier Fault Diagnosis

Step-by-step guide for diagnosing and resolving amplifier issues.

PCB Diagrams

Main PCB Layout Diagram

Diagram showing the layout of the main printed circuit board.

TSS-4000 Mother Board Diagram

Diagram of the TSS-4000 Mother Board assembly.

LS120P Electrical Parts List

Resistors and Capacitors List

List of resistors and capacitors used in the circuit.

Semiconductor and Miscellaneous Parts

List of semiconductors, connectors, and other miscellaneous components.

Integrated Circuit Diagrams

Op-Amp and Transistor Diagrams

Diagrams for integrated circuits, transistors, and MOSFETs.

Schematics

Input/Preamp Schematic

Circuit diagram for the input and preamplifier stages.

Filter/Preamp Schematic

Circuit diagram for the filter and preamplifier sections.

Auto On/Pre Schematic

Circuit diagram for the auto-on and preamplifier functions.

EQ Circuit Schematic

Circuit diagram for the equalizer section.

Limiter/Pre Schematic

Circuit diagram for the limiter and preamplifier stages.

Protection/Mother Schematic

Circuit diagram for protection circuits and mother board.

Power Supply Schematic

Circuit diagram for the power supply unit.

PWA/CDPWA Schematic

Circuit diagram for the power amplifier printed wiring assembly.

AC Innet Schematic

Circuit diagram for the AC input and IEC jack.

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