Bose Acoustimass 10 Repair Manual

The Bose Acoustimass 10 is a high-performance speaker system featuring a powered Acoustimass module and five satellite speakers, designed for home theater and audio applications. This manual provides detailed instructions for troubleshooting, disassembly, component testing, and repair procedures. Below are key sections covering safety precautions, system overview, common issues, step-by-step repair guides, parts identification, and testing procedures.

System Overview & Components

Key components: Powered Acoustimass module (amplifier and bass driver), Five cube satellite speakers, System control console, Power supply unit, Speaker cables and connectors.

Safety Precautions

Always disconnect power before servicing. Use appropriate personal protective equipment.

1. Disconnect AC power: Unplug power supply before opening any enclosure.
2. Discharge capacitors: Allow 5 minutes for power supply capacitors to discharge.
3. Use insulated tools: When working on live circuits during testing.
4. Avoid static discharge: Use anti-static wrist strap when handling circuit boards.
5. Secure work area: Ensure stable surface and adequate lighting.

WARNING! High voltages present in power supply section. Risk of electric shock. Only qualified technicians should perform repairs.

Tools & Equipment Required

Essential tools for proper repair and reassembly.

1. Phillips screwdrivers: #1 and #2 sizes for enclosure screws.
2. Torx drivers: T10 and T15 for specific fasteners.
3. Multimeter: Digital with continuity test function.
4. Soldering iron: Temperature-controlled, fine tip recommended.
5. Desoldering tools: Solder wick or vacuum pump.
6. Anti-static mat and wrist strap.
7. Audio signal generator and oscilloscope (for advanced diagnostics).
8. Replacement parts as identified in diagnostics.

CAUTION! Use proper tool sizes to avoid damaging fastener heads.

Common Symptoms & Diagnostics

• No Power: Check AC adapter, power switch, fuse, and internal power supply.
• No Bass Output: Test amplifier board, bass driver, and crossover components.
• Distorted Audio: Check for blown driver, damaged amplifier IC, or failing capacitors.
• Intermittent Operation: Inspect solder joints, connectors, and internal wiring.
• One Satellite Not Working: Test specific channel amplifier, wiring, and speaker driver.
• Hum or Buzz: Ground loop issues or failing filter capacitors.
• Protection Mode Activation: Overload condition or thermal shutdown.
• Control Console Unresponsive: Check ribbon cables and control board power.

Disassembly Procedures

Step-by-step guide to safely access internal components.

Acoustimass Module: 1. Remove rubber feet to access screws. 2. Remove bottom panel screws. 3. Carefully separate enclosure halves. 4. Note cable connections before disconnecting. 5. Secure driver and circuit board during handling.

Satellite Speakers: 1. Remove grille (if removable). 2. Remove driver mounting screws. 3. Carefully extract driver without damaging surround. 4. Note wiring polarity before disconnecting.

Control Console: 1. Remove rear panel screws. 2. Slide circuit board out carefully. 3. Document ribbon cable orientations.

Module Circuit Board Repair

Amplifier and power supply troubleshooting and repair.

1. Visual inspection: Check for burnt components, bulging capacitors, cracked solder joints.
2. Power supply test: Measure DC voltages at test points; compare to schematic values.
3. Amplifier section: Test output transistors/ICs for shorts; check bias settings.
4. Crossover components: Test inductors, capacitors, and resistors for proper values.
5. Protection circuit: Verify protection IC is functioning correctly.
6. Input stage: Test op-amps and associated components for proper operation.
7. Replacement: Desolder faulty components; install exact replacements observing polarity.
8. Testing: Power up with current limiter; check for proper operation before full reassembly.

WARNING! Electrolytic capacitors can retain charge. Discharge properly before handling.

Satellite Speaker Repair

Diagnosis and repair of cube satellite speakers.

1. Driver testing: Measure voice coil resistance (should be approximately 4-8 ohms).
2. Cone inspection: Check for tears in surround or damage to cone material.
3. Voice coil alignment: Ensure coil is not rubbing (gentle pressure test).
4. Crossover components: Satellite speakers may have simple capacitor crossover.
5. Terminal connections: Check solder joints at driver terminals and input connector.
6. Replacement drivers: If original unavailable, match specifications (impedance, sensitivity).
7. Reassembly: Ensure proper gasket seal and secure mounting.

Tip: Label drivers and enclosures to maintain matched performance across system.

Wiring & Connector Testing

Systematic testing of all interconnections.

1. Continuity test: Check all cable runs for opens or shorts.
2. Connector inspection: Look for bent pins, corrosion, or loose connections.
3. Proprietary connectors: Handle carefully; use proper extraction tool if available.
4. Shield integrity: Ensure cable shields are properly grounded at both ends.
5. Strain relief: Check that cables are properly secured to prevent internal damage.
6. Replacement cables: If damaged, use identical gauge and type for proper performance.

CAUTION! Do not force connectors; align properly before insertion.

Parts List & Replacement

Note: Some parts may be discontinued. Check with Bose or authorized service centers for availability.

Reassembly & Testing

Final assembly and verification of repair.

1. Reassembly: Reverse disassembly steps; ensure all connectors are secure.
2. Screw tightening: Use proper torque; do not overtighten plastic threads.
3. Alignment: Ensure enclosure halves mate properly without pinching wires.
4. Initial test: Power up with dim-bulb tester or current limiter.
5. Function test: Verify all inputs, controls, and outputs operate correctly.
6. Audio test: Play test tones at various frequencies; check for distortion.
7. Thermal test: Operate at moderate volume for 30 minutes; check for overheating.
8. Final inspection: Ensure all fasteners are installed and exterior is clean.

WARNING! Do not operate with enclosure open during final testing.

Troubleshooting Flowchart

Advanced Diagnostics: For persistent issues, refer to detailed service schematic (not included in this manual).

Service Support: Bose Corporation, Customer Service: 1-800-999-2673; www.bose.com/support