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JBL EON Power15 Introduction And General Information

JBL EON Power15 Introduction And General Information

Portable performance systems

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Introduction and General Information
This manual has been prepared to assist technicians with the repair and maintenance of
the JBL EON line of portable performance systems. The procedures described in this man-
ual require advanced technical experience and equipment to perform.
There are no user-serviceable parts inside these products. Opening these
products or attempting to service may expose the user to electrical shock.
Refer servicing to qualified personnel.
Substitutions
Although many of the electronic components used in these products may be available from
electronic suppliers, some components are JBL replacements only. A product repaired with-
out JBL specified components may not meet the factory specifications. The product war-
ranty may be voided by a repair using unapproved JBL components.
Test Equipment
1) Audio Precision System One, or
Distortion Analyzer
Function Generator
2) 20MHz Oscilloscope
3) Desoldering Equipment
4) Digital Multimeter
5) High Power Load Bank
6) Variac
The complexity of the product under repair requires professional audio service equipment.
Do not attempt to repair this product without this equipment.
Factory Repair
In the U.S. and Canada: In the event that an EON product must be returned to the factory
for service, contact JBL Professional Service at (818) 895-3479 for return instructions. Do
not return any merchandise without prior authorization.
Outside the U.S.: Contact the JBL Professional Distributor in your area for service
information.
WARNING
11

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Summarization of Contents

Introduction and General Information
Safety and Service Information
Key warnings, component substitution guidelines, and service contact information.
Test Equipment Requirements
Lists essential test equipment required for product repair and maintenance.
Transducer Repair
Repair Kits and Supplies
Lists available replacement kits for transducers and necessary tools for reconing speakers.
Cone Replacement Procedure Overview
Notes that woofer reconing can be performed from the front without disassembling the enclosure.
Recone Procedure Steps
Initial Inspection and Disassembly
Detailed steps for inspecting the speaker and removing the dust dome and cone assembly.
Component Preparation and Reassembly
Procedures for cleaning, preparing surfaces, and assembling the new cone with glue and alignment.
Final Assembly and Testing
Steps for attaching the dust dome, standoffs, grille, and connecting tinsel leads for final testing.
Rediaphragm Instructions 2418H
Required Tools and Procedure
Lists tools for diaphragm replacement and guides the process of baffle removal and driver access.
Signal Input Assembly Trouble-shooting EON Power15/15P-1/230
Setup and Rediaphragming Procedure
Instructions for setting up test equipment and performing compression driver rediaphragming.
EON Power15/15P-1/230 Signal Input Tests
Power Supply and LED Tests
Verifies +15V/-15V supplies and the "Mic" LED functionality.
Signal Path Gain and Response Tests
Procedures for testing line amp gain, frequency response, and common mode rejection.
EON Power15/15P-1/230 Amplifier Tests
Microphone Amplifier Performance
Tests microphone amplifier gain, frequency response, signal, and peak indicators.
EON Power15/15P-1/230 Low Frequency Chain
Low Frequency Chain Verification
Confirms bias, offset, and clipping in the low frequency amplifier output stage.
EON Power15/15P-1/230 Supply Tests
Power Supply Verification (+/- 15V and +/- 39V)
Tests +/- 15V and +/- 39V supplies for correct levels and checks for shorts or open components.
EON Power15/15P-1/230 Amplifier Muting
Amplifier Muting Circuit Tests
Tests voltages and component integrity within the amplifier's muting circuit.
EON Power15/15P-1/230 Low Frequency Amp
Low Frequency Power Amp Troubleshooting
Diagnoses issues like excessive power draw, no output, oscillation, and frequency response in the LF power amp.
EON Power15/15P-1/230 Distortion Analysis
Crossover Distortion Identification
Explains crossover distortion and guides bias adjustment for correction.
EON Power15/15P-1/230 Harmonic Distortion
Second Harmonic Distortion Analysis
Describes second harmonic distortion and diagnostic steps for amplifier imbalances.
Bias Reference Circuit Testing
Verifies bias reference voltage regulation and temperature tracking for output stage stability.
EON Power15/15P-1/230 Voltage Amplifier
Voltage Amplifier Circuit Verification
Tests front end, current source, and voltage amplifier stages for correct operation and voltage levels.
EON Power15/15P-1/230 Class A Drive
Class A Drive Circuit Testing
Verifies correct component values and voltages in the upper and lower Class A drive circuits.
EON Power15/15P-1/230 Low Frequency Filter
Low Frequency Filter Response Analysis
Analyzes the transfer function of the first low-pass filter section via frequency sweeps.
EON Power15/15P-1/230 Second Filter Section
Second Filter Section Response
Analyzes the performance of the second moderate Q high-pass filter section.
EON Power15/15P-1/230 Third Filter Section
Third Filter Section Response
Analyzes the performance of the third low Q high-pass filter section.
EON Power15/15P-1/230 Fourth Filter Section & Bias
Fourth Filter Section Response
Analyzes the performance of the fourth moderate Q low-pass filter section.
Bias Set Procedure
Steps to set amplifier bias using a load, AC power, and signal generator for optimal performance.
EON Power15/15P-1/230 High Frequency Amp
High Frequency Power Amp Troubleshooting
Diagnoses issues like excessive power draw, no output, gain, oscillation, and distortion in the HF power amp.
EON Power15/15P-1/230 High Frequency Filter
First High Frequency Filter Response
Analyzes the transfer function of the first high-pass filter section via frequency sweeps.
EON Power15/15P-1/230 Second HF Filter
Second High Frequency Filter Response
Analyzes the performance of the second moderate Q high-pass filter section.
EON Power15/15P-1/230 Frequency Response
High Frequency Response Graphs
Presents graphs illustrating high-frequency response and THD+N characteristics.
EON Power15/15P-1/230 Low Frequency Response
Low Frequency Response Graphs
Displays graphs illustrating low-frequency response and THD+N characteristics.
EON PowerSub Signal Input Troubleshooting
Power Supply, Gain, and Indicator Tests
Verifies power supply, signal gain, common mode rejection, and indicator LEDs for the PowerSub signal input.
EON PowerSub Amplifier Assembly Troubleshooting
Main Loop and Power Supply Tests
Monitors power supply operation, excessive power draw, and mute line functionality on the PowerSub amplifier.
EON PowerSub Low Frequency Chain
Low Frequency Chain Verification
Confirms bias voltage, output offset, and clipping in the PowerSub low frequency amplifier.
Excessive Line Power and Supply Tests
Checks for polarity, shorts, and +/- 15V supply compliance for the PowerSub.
EON PowerSub Amplifier Muting and Power Amp
Muting Circuit and Power Amp Performance
Tests muting circuit voltages and power amp performance for output, gain, and oscillation.
EON PowerSub Bias Reference Test
Bias Reference Circuit Verification
Tests the bias reference circuit for proper voltage regulation and temperature tracking.
EON PowerSub Low Frequency Response
Low Frequency Response Graphs
Displays graphs illustrating low-frequency response and THD+N characteristics for the PowerSub.
EON Power10 Signal Input Troubleshooting
Mic LED and Power Supply Tests
Verifies "Mic" LED operation and checks +15V/-15V power supplies and diodes.
Line Amp Gain Tests
Measures line amplifier gain for channel 1, verifying voltages at various test points.
EON Power10 Amplifier Assembly Troubleshooting
Main Test Loop and Supply Checks
Monitors power supply, input voltage, and checks for -31V/+31V supplies for the Power10 amplifier.
EON Power10 Excessive Line Power Test
Line Power and Supply Verification
Checks for polarity, component shorts, and +/- 15V supply compliance for the Power10.
EON Power10 Amplifier Muting and Power Amp
Muting Circuit and Power Amp Performance
Tests muting circuit voltages and power amp performance for output, gain, and oscillation.
EON Power10 High Frequency Response
High Frequency Response Graphs
Presents graphs illustrating high-frequency response and THD+N characteristics for the Power10.
EON Power10 Low Frequency Response
Low Frequency Response Graphs
Displays graphs illustrating low-frequency response and THD+N characteristics for the Power10.
EON 15PAK Input Assembly Troubleshooting
Mic Input Gain Test
Measures microphone input gain for channel 1, verifying voltages at key points and components.
Channel 2 Gain Test
Measures channel 2 input gain, verifying voltages on U2a/U2B and R49 for proper operation.
EON 15PAK EQ Band Testing
EQ Band Performance Verification
Tests low mid, high mid, and high frequency EQ bands for correct output levels at various settings.