Bose Acoustimass 3 User Manual

1
CAUTION: THE ACOUSTIMASS
®
-3 POWERED SPEAKER SYSTEM
CONTAINS NO USER-SERVICEABLE PARTS. TO PREVENT
WARRANTY INFRACTIONS, REFER SERVICING TO WARRANTY
SERVICE STATIONS OR FACTORY SERVICE.
PROPRIETARY INFORMATION
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF
BOSE
®
CORPORATION WHICH IS BEING FURNISHED ONLY FOR
THE PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCT
BY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF THE
BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USED
FOR ANY OTHER PURPOSE.
Table of Contents
SAFETY INFORMATION...................................................................................................... 2
ELECTROSTATIC DISCHARGE SENSITIVE (ESDS) DEVICE HANDLING....................... 3
SPECIFICATIONS ................................................................................................................ 4
Figure 1. Bass Channel Frequency Response Curve ................................................ 5
Figure 2. Left/Right Channel Frequency Response Curve ........................................ 5
Figure 3. AM-3P II Amplifier PCB Assembly Block Diagram...................................... 6
Figure 4. AM-3P II Equalizer PCB Assembly Block Diagram ..................................... 6
AM-3P II THEORY OF OPERATION .................................................................................... 7
AM-3P II DISASSEMBLY/ ASSEMBLY PROCEDURES ................................................... 13
AM-3P II TEST PROCEDURES ......................................................................................... 18
Figure 5. 120/240V Transformer Schematic .............................................................. 22
Integrated Circuit Diagrams ............................................................................................. 23
PART LISTS AND EXPLODED VIEWS ............................................................................. 26
AM-3P II Bass Module Part List .................................................................................. 27
AM-3P II Satellite Part List .......................................................................................... 28
Figure 6. AM-3P II Bass Module Exploded View ....................................................... 29
Figure 7. Woofer Location in Module......................................................................... 30
Figure 8. Satellite Exploded View............................................................................... 30
AM-3P II Packaging List .............................................................................................. 31
Figure 9. AM-3P II Packaging Exploded View ........................................................... 33
AM-3P II Main PCB Assembly Part List...................................................................... 34
AM-3P II Amplifier PCB Assembly Part List .............................................................. 39
SCHEMATICS AND PCB LAYOUTS.................................................................................. 42
Note: This service manual has been updated with information from service manual supplement
175032-S2. This supplement affects part number for R146 and R246 as used on the amplifier PCB.
Refer to 175032-S2 for more information.

Bose Acoustimass 3 Specifications

General

Brand	Bose
Model	Acoustimass 3
Category	Speakers
Language	English

Summary

SAFETY INFORMATION

ELECTROSTATIC DISCHARGE SENSITIVE (ESDS) DEVICE HANDLING

Precautions for handling ESDS devices during repair, replacement, or transport.

SPECIFICATIONS

AM-3P II THEORY OF OPERATION

BLOCK DIAGRAM DESCRIPTION

Explanation of the block diagrams for the amplifier and main PCBs.

Power Supply

Details on the universal 115/230V AC power transformer and its operation.

Differential Input Stage

Functionality of the differential amplifier buffer stage for audio input.

Compressor/Treble Stage

Explanation of the compressor and treble control stage operation.

AM-3P II DISASSEMBLY/ASSEMBLY PROCEDURES

Cover Removal

Steps to remove the cover cap and cover from the bass module.

Main PCB Assembly Removal

Procedures for removing the Main PCB from the adapter bracket.

Amplifier PCB Assembly Removal

Procedures for removing the Amplifier PCB from the unit.

Woofer Removal

Procedure for removing the woofer from the bass module.

AM-3P II TEST PROCEDURES

Satellite Test Procedures

Tests for the satellite speakers without the bass module.

Woofer (Module) Test Procedures

Tests for the bass module without the satellites.

Tone Control Test

Verifying the function of bass and treble controls.

Frequency Response of Bass Channel

Measuring the frequency response of the bass channel.

INTEGRATED CIRCUIT DIAGRAMS

PART LISTS AND EXPLODED VIEWS

AM-3P II Bass Module Part List

List of parts and exploded view for the bass module.

AM-3P II Satellite Part List

List of parts and exploded view for the satellite.

AM-3P II Packaging List

List of items included in the product packaging.

AM-3P II Main PCB Assembly Part List

List of components for the Main PCB assembly.

SCHEMATICS AND PCB LAYOUTS