LEM Avalon AV12-4 User Manual

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JJ
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Soldering point.
Male connector.
Female connector.
M/F faston connector.
Test point.
Supply voltage.
Logic supply ground.
Analog supply ground.
Chassis ground.
Earth ground.
Flag joined with one or more flags
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SERVICE MANUAL
L CODE: 270241 M
Warnings
with the same signal name inscribed.
Address
ATTENTION
Observe precautions when handling electrostatic sensitive devices.
Notice
Service must be carried out by qualified personnel only.Any tampering carried out by unqualified personnel during the guarantee period
will forfeit the right to guarantee.
For a correct operation of the instrument, after having switched off, be careful to wait at least 3 seconds before switching on again.
To improve the device's specifications, the schematic diagrams may be subject to change without prior notice.
All components marked by this symbol have special safety characteristics, when replacing any of these components use only
manufacturer's specified parts.
The (µ) micro symbol of capacitance value is substituted by U.
The (
Ω
) omega symbol of resistance value is substituted by E.
The electrolytic capacitors are 25Vdc rated voltage unless otherwise specified.
All resistors are 1/8
Ω
unless otherwise specified.
All switches shown in the "OFF" position. All DC voltages measured to ground with a voltmeter 20KOhm/V.
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Index
Technical Specifications
2
AV12-4, AV12-8, AV15-4, AV15-8, AV15S Passive Versions Schematic Diagrams
2
AV12-4, AV12-8, AV15-4, AV15-8, AV15S Passive Versions Spare Part List
3
4
AV12A Test Procedures & Adjustment
AV12A, AV15A, AV15SA Block Diagrams
3
AV15A Test Procedures & Adjustment
5
AV15SA Test Procedures & Adjustment
5
AV12A Schematic Diagram
8
9
AV15SA Schematic Diagram
AV15A Schematic Diagram
7
10
AV12A, AV15A, AV15SA Active Version Spare Part List

LEM Avalon AV12-4 Specifications

General

Type	Passive Speaker
Configuration	2-way
LF Driver Size	12"
Impedance	8 Ohms
Tweeter Size	1.4 inches
Inputs	Speakon
HF Driver Size	1.4 inches

Summary

Index of Technical Manual

Technical Specifications Overview

Overview of technical specifications for all models.

Spare Part Lists Overview

Lists of spare parts for passive and active versions.

Block Diagrams Overview

Schematic block diagrams for various speaker models.

Test Procedures & Adjustments Overview

Detailed procedures for testing and adjusting amplified speakers.

General Warnings and Safety Notices

Safety Notice for Servicing

Warning about qualified personnel and warranty.

Handling Electrostatic Sensitive Devices

Precautions for handling sensitive electronic components.

Manufacturer Contact Information

GeneralMusic S.p.A. Contact Details

Sales division address and online presence.

Avalon Loudspeaker Technical Specifications

Loudspeaker Specifications by Model

Detailed specs for AV12, AV15, AV15S models.

Amplifier Specifications by Model

Specs for active versions AV12-4, AV12-8, AV15-4, AV15-8, AV155.

Crossover Board Schematics

Schematics for 768202 to 768206 crossover boards.

Transistor Package Pinouts

Pin configurations for common transistor packages used.

Avalon Passive Loudspeaker Spare Parts

AV-12 4 Ohm Spare Parts

List of parts for AV-12 4 Ohm passive model.

AV-15S 4 Ohm Spare Parts

List of parts for AV-15S 4 Ohm passive model.

AV-12 8 Ohm Spare Parts

List of parts for AV-12 8 Ohm passive model.

AV-15 4 Ohm Spare Parts

List of parts for AV-15 4 Ohm passive model.

AV-15 8 Ohm Spare Parts

List of parts for AV-15 8 Ohm passive model.

System Block Diagrams

AV15SA Amplifier Block Diagram

Block diagram for AV15SA amplified subwoofer.

AV15A Amplifier Block Diagram

Block diagram for AV15A amplified loudspeaker.

AV12A Amplifier Block Diagram

Block diagram for AV12A amplified loudspeaker.

General Test Procedures and Adjustments

Precautionary Notes for Testing

Safety precautions before starting any test.

General Remarks for Servicing

Important notes and advice for maintenance.

Visual Inspection Checklist

Steps for visually checking the unit before operation.

Required Test Instruments

List of necessary tools and equipment for testing.

AV12A Amplified Loudspeaker Testing

AV12A Technical Specifications

Technical specifications specific to the AV12A model.

AV12A Setup Procedures

Initial setup steps before testing AV12A.

AV12A Supply Check

Procedure for checking power supply voltages on AV12A.

AV12A Channels Check

Testing and adjustment for AV12A audio channels.

AV12A Gain Adjustment

How to adjust the gain for the AV12A model.

AV12A Bias Adjustment

Procedure for setting the bias on the AV12A.

AV12A Bandwidth Check

Verifying the frequency response of the AV12A.

AV12A Offset Sensor Check

Testing the offset detection circuit for AV12A.

AV12A Signal to Noise Ratio Check

Measuring the signal-to-noise ratio for AV12A.

AV15A Amplified Loudspeaker Testing

AV15A Technical Specifications

Technical specifications specific to the AV15A model.

AV15A Setup Procedures

Initial setup steps before testing AV15A.

AV15A Supply Check

Procedure for checking power supply voltages on AV15A.

AV15A Channels Check

Testing and adjustment for AV15A audio channels.

AV15A Gain Adjustment

How to adjust the gain for the AV15A model.

AV15A Bias Adjustment

Procedure for setting the bias on the AV15A.

AV15A Bandwidth Check

Verifying the frequency response of the AV15A.

AV15A Offset Sensor Check

Testing the offset detection circuit for AV15A.

AV15A Signal to Noise Ratio Check

Measuring the signal-to-noise ratio for AV15A.

AV15SA Amplified Subwoofer Testing

AV15SA Technical Specifications

Technical specifications specific to the AV15SA model.

AV15SA Setup Procedures

Initial setup steps before testing AV15SA.

AV15SA Supply Check

Procedure for checking power supply voltages on AV15SA.

AV15SA Channels Check

Testing and adjustment for AV15SA audio channels.

AV15SA Gain Adjustment

How to adjust the gain for the AV15SA model.

AV15SA Bias Adjustment

Procedure for setting the bias on the AV15SA.

AV15SA Bandwidth Check

Verifying the frequency response of the AV15SA.

AV15SA Offset Sensor Check

Testing the offset detection circuit for AV15SA.

AV15SA Signal to Noise Ratio Check

Measuring the signal-to-noise ratio for AV15SA.

Advanced Test Procedures for AV15SA

AV15SA Supply Check Continuation

Further checks on AV15SA power supply.

AV15SA Channels Check Continuation

Further checks on AV15SA audio channels.

AV15SA Gain Adjustment Continuation

Further gain adjustments for AV15SA.

AV15SA Bias Adjustment Continuation

Further bias adjustments for AV15SA.

AV15SA Bandwidth Check Continuation

Further bandwidth checks for AV15SA.

AV15SA Offset Sensor Check Continuation

Further offset sensor checks for AV15SA.

AV15SA Signal to Noise Ratio Check Continuation

Further S/N ratio checks for AV15SA.

General Test Advices

General advice for troubleshooting and testing.

Schematic Diagrams - Inputs and Supply Boards

768207 Inputs Board Schematic

Circuit diagram for the 768207 inputs board.

768211 Supply Board Schematic

Circuit diagram for the 768211 supply board.

768202 Crossover Board Schematic

Circuit diagram for the 768202 crossover board.

Schematic Diagrams - Inputs and Amplifier Boards

768208 Inputs Board Schematic

Circuit diagram for the 768208 inputs board.

768212 Supply Board Schematic

Circuit diagram for the 768212 supply board.

727607 350W Amplifier Board Schematic

Circuit diagram for the 727607 350W amplifier board.

768204 Crossover Board Schematic

Circuit diagram for the 768204 crossover board.

Schematic Diagrams - Controls, Inputs, and Amplifier Boards

768210 Controls & Crossover Board Schematic

Circuit diagram for 768210 controls and crossover board.

768209 Inputs Board Schematic

Circuit diagram for the 768209 inputs board.

768213 Supply Board Schematic

Circuit diagram for the 768213 supply board.

727607 350W Amplifier Board Schematic

Circuit diagram for the 727607 350W amplifier board.

Avalon Active Loudspeaker Spare Parts

AV-12A Spare Parts List

List of parts for AV-12A active model.

AV-15A Spare Parts List

List of parts for AV-15A active model.

AV-15SA Spare Parts List

List of parts for AV-15SA active model.