Bose Companion 3 Series II Manuale di servizio - Pagina 34

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SAFETY BULLETIN

Bulletin Part Number: 271885-SB3

Product: Companion

Subject: Possible failure of C316, C317, C318 and C319 on the main PCB assembly.

Disposition: All Companion

Symptom: The four capacitors should be replaced regardless of symptom.

Reason: The capacitors C316, C317, C318 and C319 may crack due to flexing of the board. This can cause the

capacitors to have a low resistance and create a DC offset voltage on the output of the amplifier.

Solution: Replace C316, C317, C318 and C319 with a new type (Kemet open-mode ceramic) and value (0.1uF)

part number 286499-104. This change will prevent possible DC offset voltages due to a cracked

capacitor. Refer to the Companion

disassembly/assembly and test procedures. Verify proper operation before returning the system

to the customer.

NOTE: There are two versions of the board, the original board is labeled with 271838 and present board is

labeled with 280066. Both versions need the four capacitors replaced with the new part number. The

two different versions are shown on Page 2 of this document.

FINS: 2476, 2499 and 2619

FRACAS: 494

Date Issued: 10/05

3 Multimedia Speaker System

3 Multimedia Speaker System built before 11/11/05 (DOM below 5315).

Location of C316, C317, C318 and C319

on Sheet 1 of SD280066 and SD271838

Bose Corporation; The Mountain, Framingham, Ma. 01701-9168

Service documentation available on-line at http://serviceops.bose.com

3 service manual part number 271885-SM for

U301

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