Bose Lifestyle 48 Service Manual

The Bose Lifestyle 48 is a premium home theater system featuring an Acoustimass module, ADAPTiQ audio calibration, Media Center with integrated DVD/CD player, AM/FM tuner, and support for multiple audio/video sources. This service manual provides detailed information for qualified technicians regarding system overview, disassembly, troubleshooting, parts replacement, and technical specifications. Below are key sections for system description, service procedures, diagnostics, and parts information.

1. System Overview 2. Safety Precautions 3. Disassembly Instructions 4. Technical Specifications 5. Control and Interface 6. Connection Diagrams 7. Troubleshooting Flowcharts 8. Error Code Reference 9. Parts List & Exploded Views 10. Firmware Update Procedure 11. Test & Alignment

System Overview

Key components: Media Center (Lifestyle® 48), Acoustimass® module, Jewel Cube® speakers, remote control, ADAPTiQ headset, various cables and accessories.

Component	Description
Media Center	Main control unit with DVD/CD player, AM/FM tuner, source inputs
Acoustimass Module	Bass module for low-frequency reproduction
Jewel Cube Speakers	Five satellite speakers (front L/R, center, surround L/R)
Remote Control	Unified system controller
ADAPTiQ Headset	For room calibration and audio optimization
Power Cords	For Media Center and Acoustimass module
Connection Cables	Speaker cables, audio/video interconnects
Standby/Operate	Controls system power state
Source Select	Chooses input (DVD, AUX, TUNER, etc.)
Volume Control	Adjusts master volume level

Safety Precautions

Before servicing, disconnect AC power. Use appropriate ESD protection.

Disconnect Power: Unplug the Media Center and Acoustimass module from AC outlet.
ESD Precautions: Use grounded wrist strap and anti-static mat when handling PCBs.
High Voltage: Some sections contain hazardous voltages even when unplugged. Allow time for capacitors to discharge.
Component Handling: Use proper tools; avoid mechanical stress on connectors and boards.

WARNING! Only qualified service personnel should perform procedures in this manual. Incorrect service may create safety hazards.

Disassembly Instructions

Step-by-step guide for accessing internal components of Media Center and Acoustimass module.

Media Center Top Cover: Remove four Phillips screws from bottom, slide cover rearward and lift.
Front Panel Assembly: Disconnect ribbon cables, remove securing screws, gently pivot outward.
Main PCB: Disconnect all cables, remove mounting screws, lift board from chassis.
Optical Drive: Remove data and power cables, unscrew from chassis, slide out.
Acoustimass Module: Remove grille, disconnect speaker terminals, remove amplifier plate screws.

CAUTION! Label all cables before disconnection. Note screw locations and lengths for reassembly.

Technical Specifications

Power Requirements: 120V~, 60Hz, 2.5A (Media Center); 120V~, 60Hz, 3A (Acoustimass).
Audio Output: Total system power: 400 watts RMS.
Speaker Impedance: 4–8 ohms per channel.
Frequency Response: 35 Hz – 20 kHz (±3 dB).
Video Support: Composite, S-Video, Component video outputs.
Audio Inputs: Analog stereo, coaxial and optical digital.
Dimensions (Media Center): 16.5" W × 3.6" H × 13.4" D.
Weight: 18.7 lbs (Media Center); 44.1 lbs (Acoustimass module).

Control and Interface

Front Panel: Standby/Operate, Eject, Source, Volume Up/Down. Display: Shows source, volume, status messages.

Remote Control: Power, Numeric, Navigation, Menu, Select, Volume, Mute, Source, Transport controls (Play, Pause, Stop, etc.).

On-Screen Menu: Setup (Speaker, Audio, Video, System), Source selection, ADAPTiQ calibration. Service Mode: Accessed by specific button sequence for diagnostics and adjustments.

Connection Diagrams

Standard setup: Media Center to TV (video), Media Center to Acoustimass module (sub out), Media Center to speakers, sources to Media Center inputs.

Speaker Connections: Color-coded terminals on Media Center rear (Front L/R: White/Red, Center: Green, Surround L/R: Gray/Blue).
Acoustimass Module: Connect via proprietary cable from Media Center SUB OUT.
Video Output: Connect to TV using composite, S-video, or component cables.
Source Inputs: Connect DVD player, cable box, etc., to appropriate audio/video inputs.

Tip: Ensure all connections are secure and correct before applying power.

Troubleshooting Flowcharts

Systematic approach to common faults.

No Power: Check AC cord, outlet, internal fuse. Measure standby voltage on power supply.
No Audio: Verify source, volume, mute. Check speaker connections. Test with internal tuner.
No Video: Confirm TV input selection. Check video cable and connections. Test different source.
Disc Playback Issues: Clean disc. Check for disc format compatibility. Inspect optical lens.
Remote Inoperative: Replace batteries. Check for IR obstruction. Verify remote operation in service mode.

WARNING! Follow flowcharts in sequence. Do not skip steps to avoid misdiagnosis.

Error Code Reference

Displayed error codes and their meanings.

Code	Description	Action
E01	Memory initialization error	Check/replace main board RAM
E02	Optical drive communication fault	Inspect drive cable/connector; replace drive
E03	ADAPTiQ calibration failure	Check headset/mic; rerun calibration
E04	Over-temperature warning	Ensure ventilation; check fan operation
E05	Speaker impedance fault	Check speaker wiring for shorts/opens

Parts List & Exploded Views

Reference for ordering replacement parts.

Media Center: Main PCB (Part #123456), Front Panel PCB (#123457), Optical Drive Assembly (#123458), Power Supply (#123459), Chassis (#123460).

Acoustimass Module: Amplifier Plate (#123461), Driver Assembly (#123462), Cabinet (#123463).

Jewel Cube Speakers: Satellite Speaker (each) (#123464), Grille (#123465).

Remote: Remote Control (#123466), Battery Cover (#123467).

CAUTION! Use only genuine Bose replacement parts to ensure performance and safety.

Firmware Update Procedure

Instructions for updating system software via CD.

Download latest firmware from Bose service website and burn to CD-R.
Insert CD into Media Center. System will recognize update disc.
Follow on-screen prompts. Do not interrupt power during update.
System will reboot automatically upon completion.
Verify new firmware version in System Information menu.

WARNING! Interrupting a firmware update may render the system inoperable.

Test & Alignment

Post-repair verification procedures.

Test	Equipment Required	Procedure/Pass Criteria
Audio Output Test	Audio analyzer, test disc	All channels output specified power with <1% THD at 1 kHz.
Video Output Test	Video pattern generator, monitor	All video outputs display correct color bars and resolution.
Power Supply Rails	Digital multimeter	All DC voltages within ±5% of nominal values under load.
Optical Drive Performance	Test CD/DVD set	Reads all test sectors without errors; correct playback.
Remote Function Test	IR receiver tester	All buttons transmit correct IR codes.

Reset to Factory Defaults: Service Menu > System > Reset All Settings.

Service Support: Authorized Bose service centers only. Contact Bose Corporation for technical assistance.