JBL EON15 G2 Betriebsanleitung

Technical Service Manual

Rev. A

7/16/2004

TABLE OF CONTENTS

PRODUCT OVERVIEW 3

SPECIFICATIONS/FREQUENCY RESPONSE GRAPHIC 4

PANEL CONTROLS, CONNECTORS AND INDICATORS 5

BLOCK DIAGRAM 8

CIRCUIT DESCRIPTIONS 9

TROUBLESHOOTING GUIDE 18

SEMICONDUCTOR DIAGRAMS 21

FINAL TEST PROCEDURE 22

PICTORIALS OF PCB ASSEMBLIES 23

JBL WARRANTY LIMITED WARRANTY 26 - 65

SYSTEM EXPLODED VIEW

FAILURE QA CODES

SCHEMATICS / MASTER PARTS LIST

Product Overview

Specifications

Frequency Response

Notes:

JBL Professional is continually engaged in research activities to enable further product improvement. New materials, production methods and design

refinements are instituted into the existing product without notification and, therefore, the information contained within this manual is subject to

change without notice. Rest assured that your JBL Professional equipment will always equal or exceed the published design specifications unless

otherwise stated.

Connectors, Controls and Indicator

EON15 G2 Block Diagram

AC Input Module

The main line voltage is connected at input jack P1 on the ac input PCB. Capacitors C2 and C3 work

in conjunction with C1 to help reduce the instantaneous line voltage spikes that cause static noise in

the high frequency range. Pin 2, the AC ground, is connected to chassis ground. Pins 1 and 3 are

connected to the 2-pole 2-position main power switch, SW1. Toggling of SW1 directs the ac voltage to

travel through fuses, F1 and F2, to the voltage selector switch, SW2 that allows the customer to

manually select between 120V or 230V. It is important to power down the equipment before this

switch is operated to avoid possible driver damage. Electrically, this switch, SW2, determines which

power transformer primary receives the applied alternating current so that the proper output voltage

will result.

We will assume that the mains input voltage to the transformer is 115 Vac for this circuit description.

The toroidal transformer output would then deliver 60Vac to the power supply connector P3 on the

main amplifier PCB.

Power Supply

Initially, raw alternating current enters the EON15-G2 from the IEC connector on the AC input PCB and is

directly connected to the power switch SW1 through the main fuses F1 & F2. Toggling SW2 directs the ac

voltage to travel to the voltage selector switch that allows the customer to select between 120V or 230V.

Electrically, this switch determines which power transformer primary is applied so that the proper output voltage

will result. In either case, the voltage will be stepped down by the toroidal transformer windings.

The toroidal transformer steps down the input alternating voltage from 120Vac to 60Vac and enters the main

PCB at P3, where it is rectified into ±40Vdc by bridge rectifier BR1. It is filtered by capacitors C75 and C76 . .

. the end result is a stable power supply. This voltage is used for the rails for the low and high frequency power

amplifiers, which provides a full signal voltage swing from peak to peak of 80 volts.

Simultaneously, this rectified voltage from BR1 is also passed through clamping diodes D9 and D10 and

regulated at ±15 Vdc by Q15 and Q16, respectively. This low voltage power supply drives the signal processing

IC’s and housekeeping/fault detection circuitry.

Voltage doubling circuitry supplies the ±80 Vdc necessary to supply the drivers and pre-drivers. By utilizing

this bootstrap configuration, the adjacent stages are prevented from scavenging the voltage from the rails during

demanding informational or musical passages.

The LED DS2 is used as a pilot lamp.

Delay is provided on initial power up by the time constant of C46 and R77. Once charge builds up at C46, Q14

biases off after 4 seconds allowing comparator U5C to toggle taking its output high. Directly connected to Q6

and Q1 this action enables both amplifiers. Upon power down, Q14 is instantaneously biased on causing the

toggling of U5C, thereby, disabling both amplifiers until C46 is totally discharged via R93 and R98.

Excessive heatsink temperature will cause RT1 to short, toggling U5C, and enabling amplifier shutdown.

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