Bose Acoustimass Service Manual

The Bose Acoustimass Service Manual provides detailed technical information, service procedures, and safety guidelines for the Bose Acoustimass speaker system. This manual is intended for qualified service personnel and covers system overview, specifications, disassembly/assembly instructions, troubleshooting, parts lists, and regulatory compliance. Below are key sections for safety, features, service procedures, and technical reference.

1. System Overview & Features 2. Safety Precautions 3. Technical Specifications 4. Disassembly & Assembly Procedures 5. Circuit Diagrams & Schematics 6. Troubleshooting Flowcharts 7. Parts List & Exploded Views 8. Alignment & Calibration 9. Testing Procedures 10. Regulatory & Compliance Information 11. Warranty & Service Contacts

System Overview & Features

The Bose Acoustimass system consists of a bass module and satellite speakers designed for high-fidelity audio reproduction with minimal visible speaker presence.

Component	Description
Acoustimass Bass Module	Houses proprietary waveguide technology for deep, distortion-free bass
Satellite Speakers	Compact direct/reflecting speakers for clear midrange and high frequencies
Input Panel	Accepts speaker-level inputs from amplifier/receiver
Crossover Network	Internal electronic crossover directs frequencies to appropriate drivers
Protection Circuitry	Overload and thermal protection for amplifier and drivers
Grille Assembly	Removable acoustic cloth grille for service access

Safety Precautions

Before servicing, review all safety warnings to prevent injury and equipment damage.

Disconnect AC power before opening any enclosure.
Use appropriate insulated tools when working on live circuits.
Discharge large capacitors before handling.
Replace safety-critical components only with specified parts.
Ensure proper grounding of test equipment.

WARNING! High voltages are present during operation. Only qualified personnel should perform service.

Technical Specifications

System Type: 5.1 channel home theater speaker system
Frequency Response: 35Hz - 20kHz (±3dB)
Impedance: 4-8 ohms (compatible with most amplifiers)
Power Handling: 10-200 watts per channel
Crossover Frequency: 180Hz (bass module to satellites)
Dimensions (Bass Module): 14.5" H × 21.5" W × 7.5" D
Weight: 28 lbs (bass module), 4 lbs each (satellite)
Finish: Black matte vinyl with removable grille

Disassembly & Assembly Procedures

Step-by-step instructions for accessing internal components.

Remove grille: Carefully pry at corners using plastic tool.
Remove front baffle: Remove 8 Phillips screws around perimeter.
Access driver assembly: Disconnect wiring harness from drivers.
Remove crossover board: Unscrew mounting brackets.
Reassembly: Reverse procedure, ensuring all connections are secure.

CAUTION! Use proper torque when tightening screws to avoid damaging threads or components.

Circuit Diagrams & Schematics

Complete electrical schematics for all system components.

Bass Module: Power supply, amplifier, protection circuit, crossover network.

Satellite Speakers: Driver connections, crossover components.

Input Panel: Terminal connections, impedance matching network.

Reference diagrams show component values, test points, and voltage specifications.

Troubleshooting Flowcharts

Systematic approach to diagnosing common issues.

Symptom	Possible Cause	Test Procedure
No sound from bass module	Amplifier failure, blown fuse, driver damage	Check input signal, test amplifier output, inspect driver continuity
Distorted audio	Overdriven amplifier, damaged voice coil, loose connection	Reduce volume, test with known good source, check all connections
Intermittent operation	Loose wiring, failing component, thermal protection	Inspect solder joints, monitor temperature, test under load
Hum or buzz	Ground loop, power supply issue, cable problem	Isolate ground, check power supply capacitors, test with different cables
Protection circuit engaging	Overload, short circuit, overheating	Check impedance, measure current draw, ensure proper ventilation

Parts List & Exploded Views

Complete listing of replaceable components with part numbers.

Drivers: Woofer (Part #123456), Tweeter (Part #123457)
Electronics: Crossover board (Part #123458), Amplifier module (Part #123459)
Hardware: Screws, brackets, terminals
Cosmetic: Grille cloth, badges, feet
Cables: Speaker wire, input cables

Exploded views show assembly relationship and proper orientation of all parts.

Alignment & Calibration

Procedures for optimizing system performance after service.

Driver alignment: Ensure proper mounting and sealing.
Crossover calibration: Verify frequency response with test equipment.
Phase alignment: Check timing between bass module and satellites.
Output level matching: Balance all channels for uniform sound.
Final listening test: Verify performance with reference material.

Note: Use calibrated measurement microphone and audio analyzer for best results.

Testing Procedures

Comprehensive testing to verify repair quality.

Power Up Test: Check for proper startup sequence
Signal Response Test: Verify frequency response across range
Power Handling Test: Test at rated power for specified duration
Protection Circuit Test: Verify overload and thermal protection
Final Quality Test: Subjective listening evaluation

Tip: Document all test results for service records.

Regulatory & Compliance Information

FCC Part 15: Class B digital device compliance. UL/CSA safety standards. CE marking for European markets. RoHS compliant (Restriction of Hazardous Substances).

Warranty & Service Contacts

Limited warranty: 5 years for speakers, 3 years for electronics from date of purchase.

Service Centers: Authorized Bose service centers worldwide.

Technical Support: 1-800-999-2673 (US and Canada)

Online Resources: www.bose.com/support

Parts Ordering: Contact authorized parts distributor with part numbers.

Note: Warranty void if serviced by unauthorized personnel or with non-genuine parts.