Bose lifestyle av38 48 service manual
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2 1. Parts that have special safety characteristics are identified by the \ symbol on schematics or by special notes on the parts list. Use only replacement parts that have critical characteristics recom- mended by the manufacturer. 2. Make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from the supply circuit before returning the unit to the custo\ mer. Use the following checks to perform these measurements: A. Leakage Current Hot Check-With the unit completely reassembled, plug \ the AC line cord directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use\ a leakage current tester or a metering system that complies with American National Standards Institute (ANSI) C101.1 Leakage Current for Appliances and Underwriters Laboratories (UL) 6500 / IEC 60056 paragraph 9.1.1. With the unit AC switch first in the ON position and then in OFF position, measure fro\ m a known earth ground (metal waterpipe, conduit, etc.) to all exposed metal parts of the unit (antennas, handle bracket, metal cabinet, screwheads, metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5 milliamp. Reverse the unit power cord plug in the outlet and repeat \ test. ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE ELIMINATED BEFORE RETURNING THE UNIT TO THE CUSTOMER. B. Insulation Resistance Test Cold Check-(1) Unplug the power supply and connect a jumper wire between the two prongs of the plug. (2) Turn on the power switch of the unit. (3) Measure the resis- tance with an ohmmeter between the jumpered AC plug and each exposed metallic cabinet part on the unit. When testing 3 wire products, the resistance measured to the product enclosure should be between 2 and infinite MOhms. Also, the resistance measured to exposed input/output connectors should be between 4 and infinite MOhms. When testing 2 wire products, the resistance measured to exposed input/output connectors should be between 4 and infinite MOhms. \ If it is not within the limits specified, there is the possibility of a shock hazard, and the unit must\ be repaired and rechecked before it is returned to the customer. ELECTROSTATIC DISCHARGE SENSITIVE (ESDS) DEVICE HANDLING This unit contains ESDS devices. We recommend the following precautions when repairing, replacing or transporting ESDS devices: Perform work at an electrically grounded work station. Wear wrist straps that connect to the station or heel straps that connect to conductive floor mats. Avoid touching the leads or contacts of ESDS devices or PC boards even if properly grounded. Handle boards by the edges only. Transport or store ESDS devices in ESD protective bags, bins, or totes. D\ o not insert unprotected devices into materials such as plastic, polystyrene foam, clear plastic \ bags, bubble wrap or plastic trays. SAFETY INFORMATION
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3 The AV38 and AV48 Media Center uses a hardware platform derived from the AV28 Media Center. It uses the same plastic enclosure and external power supply unit ("floor \ wart"). Likewise, it is meant to interface to the same home theater speaker system. The AV38 and AV48 Media Center have an internal hard drive used for storing CDs. AV38 - Stores 200 hours of music or over 200 CDs. AV48 - Stores 340 hours of music or over 350 CDs. The AV38 and AV48 Media Center is manufactured in two hardware configurations, Euro an\ d US: Like the AV28 Media Center, the AV38 and AV48 Media Center is a self-contained DVD/CD/MP3 disc player with an AM/FM tuner for use with Bose ® powered speaker systems. In addition to the two internal sources (DVD/CD and AM/FM tuner), it allows playing up to four external audio sources: TV, VCR, CAB/SAT, and AUX. A 27MHz (40MHZ for Euro), one-way RF remote control operates the unit without line-of-sight restriction; provisions for infrared remote contro\ l of the Media Center also exist. An integrated IR blaster allows limited control of other manufacturer's \ equipment (TV's, VCR's and Cable/Satellite Set-Top boxes). The Media Center has two independent audio output zones (Main and Bose ® Link), accessible through circular DIN connectors in the back of the p\ roduct. The AV38 and AV48 Media Center contains five PCBs: The AV38 and AV48 Media Center use a new smart speaker protocol and uses a 9 pin DIN s\ peaker connector. The AV28 Media Center used an 8 pin DIN speaker connector. Support is limited for legacy product with an 8 pin DIN. PCB Assembly P/N Main PCB 282491-010 IR PCB Contained on 282491-010 Headphone PCB Contained on 282491-010 Tuner PCB 273300-01x Keypad PCB 277595-001 Product Description Variant US EURO SCART X RDS X TV On Detector X Remote 27MHz RF 40MHz RF FM Tuner US EURO Software Update Information The software in the AV38 and AV48 Media Center can be updated using a software update CD avail- able from Bose service or downloaded at http://serviceops.bose.com. Refer to page 50, Console Key Special Functions, to determine the software version of the unit. Refer to the Bose service extranet site for information regarding the latest software revision; click on Lifestyle ®music centers and then AV38/AV48 media center. http://serviceops.bose.com