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JBL EON Power10 Introduction And General Information

JBL EON Power10 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
WARNING
Safety warning about electrical shock and servicing procedures.
Substitutions
Policy on using non-JBL specified components and warranty implications.
Test Equipment
List of required test equipment for performing repairs.
Factory Repair
Instructions for returning products to the factory for service.
Transducer Repair
Repair Kits
List of available replacement parts for speaker transducers.
Cone Replacement Procedure
Detailed steps for replacing the cone assembly of a speaker.
Rediaphragm Instructions 2418H
Tools Required
List of tools necessary for diaphragm replacement.
Procedure
Step-by-step guide for replacing the diaphragm assembly.
Signal Input Assembly Trouble-shooting EON Power15 and EON15P-1/230
Initial Setup
Initial connection and setup for troubleshooting the signal input assembly.
Main Test Loop
Procedures for testing the main power and supply circuits.
Power Supply Test
Verifying the correct levels of +15V and -15V power supplies.
“Mic” LED Test
Testing the operation of the "Mic" LED indicator.
Gain Test
Verifying audio signal gain levels across different stages.
Line Amp Frequency Response Test
Testing the frequency response of the line amplifier section.
Line Amp Common Mode Rejection Test
Testing the common mode rejection capability of the line amplifier.
Mic Amp Test
Testing microphone input gain levels and voltage outputs.
Mic Amp Frequency Response Test
Testing the frequency response of the microphone amplifier.
Signal Indicator Test
Verifying the correct operation of the signal indicator LED.
Peak Indicator Test
Verifying the correct operation of the peak indicator LED.
Amp Assembly Trouble-shooting EON Power15 and EON15P-1/230
Initial Setup
Initial setup procedures for amplifier assembly troubleshooting.
Main Test Loop
Testing the main power and signal paths of the amplifier.
Confirmation of Low Frequency Chain
Verifying the proper operation of the low frequency amplifier chain.
Confirmation of High Frequency Chain
Verifying the proper operation of the high frequency amplifier chain.
Excessive Line Power Test
Diagnosing and testing for excessive power draw from the AC line.
Supply Test
Testing various critical power supply voltage levels.
Amplifier Muting Test
Testing the functionality of the amplifier muting circuit.
Low Frequency Power Amp Test
Troubleshooting procedures for the low frequency power amplifier.
Crossover distortion in output
Identifying and resolving crossover distortion issues in the amplifier output.
Excessive Second harmonic distortion in output
Identifying and resolving second harmonic distortion in the amplifier output.
Bias Reference Test
Testing and adjusting the amplifier's bias reference circuit.
Voltage Amp Test
Testing the voltage amplifier section of the amplifier.
Front End and Current Source
Testing the amplifier's front end and current source components.
Upper Class A Drive
Testing the upper class A drive circuitry of the amplifier.
Level Shifter
Testing the level shifter circuit within the amplifier.
Lower Class A Drive
Testing the lower class A drive circuitry of the amplifier.
Low Frequency Filter Test
Testing the performance and response of the low frequency filter.
Bias Set Procedure
Procedure for correctly setting the amplifier's bias levels.
High Frequency Power Amp Test
Troubleshooting procedures for the high frequency power amplifier.
High Frequency Filter Test
Testing the performance and response of the high frequency filter.
Signal Input Assembly Trouble-shooting EON PowerSub
Initial Setup
Initial connection and setup for PowerSub signal input troubleshooting.
Power supply Test
Verifying power supply levels for the PowerSub signal input assembly.
Gain Test
Testing the signal input gain for the PowerSub unit.
Common Mode Rejection Test
Testing common mode rejection for the PowerSub signal input.
"Phase LED Test"
Testing the operation of the phase LED indicator.
Signal Indicator Test
Verifying the correct operation of the signal indicator LED.
Peak Indicator Test
Verifying the correct operation of the peak indicator LED.
Amp Assembly Trouble-shooting EON PowerSub
Initial Setup
Initial setup procedures for PowerSub amplifier troubleshooting.
Main Loop Test
Testing the main power and signal paths of the PowerSub amplifier.
Confirmation of Low Frequency Chain
Verifying the proper operation of the low frequency amplifier chain.
Excessive Line Power Test
Diagnosing and testing for excessive power draw from the AC line.
Supply Test
Testing various critical power supply voltage levels.
Amplifier Muting Test
Testing the functionality of the amplifier muting circuit.
Power Amp Test
Performing power amplifier tests on the unit.
Amplifier AB Crossover distortion in output.
Testing for crossover distortion issues in the amplifier output.
Bias Reference Test.
Testing and adjusting the amplifier's bias reference circuit.
Signal Input Assembly Trouble-shooting EON Power10
Initial Setup
Initial connection and setup for Power10 signal input troubleshooting.
"Mic" LED Test
Testing the operation of the "Mic" LED indicator.
Power Supply Test
Verifying power supply levels for the Power10 signal input assembly.
Line Amp Gain Test
Testing signal input gain for the line amplifier.
Line Amp Frequency Response Test
Testing the frequency response of the line amplifier.
Mic Amp Gain Test
Testing microphone input gain levels.
Mic Amp Frequency Response Test
Testing the frequency response of the microphone amplifier.
Signal Indicator Test
Verifying the correct operation of the signal indicator LED.
Peak Indicator Test
Verifying the correct operation of the peak indicator LED.
Amp Assembly Trouble-shooting EON Power10
Initial Setup
Initial setup procedures for Power10 amplifier troubleshooting.
Main Test Loop
Testing the main power and signal paths of the amplifier.
Confirmation of Low Frequency Chain
Verifying the proper operation of the low frequency amplifier chain.
Confirmation of High Frequency Chain
Verifying the proper operation of the high frequency amplifier chain.
Excessive Line Power Test
Diagnosing and testing for excessive power draw from the AC line.
Supply Test
Testing various critical power supply voltage levels.
Amplifier Muting Test
Testing the functionality of the amplifier muting circuit.
High and Low Frequency Power Amp Test
Testing high and low frequency power amplifier performance.
Input Assembly Trouble-shooting EON 15PAK
Initial Setup
Initial connection and setup for 15PAK input assembly troubleshooting.
“Mic" LED Test
Testing the operation of the "Mic" LED indicator.
Power Supply Test
Verifying power supply levels for the 15PAK input assembly.
Line Gain Test
Testing signal input gain for the input assembly.
Low Mid Frequency Band:
Testing low-mid frequency band gain and EQ response.
High Mid Frequency Band:
Testing high-mid frequency band gain and EQ response.
High Frequency Band:
Testing high frequency band gain and EQ response.