BOSE 271885-B3 Schematic
SAFETY BULLETIN
Bulletin Part Number: 271885-SB3
®
Product: Companion
Subject: Possible failure of C316, C317, C318 and C319 on the main PCB assembly.
3 Multimedia Speaker System
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® 3 service manual part number 271885-SM for
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.
®
3 Multimedia Speaker System built before 11/11/05 (DOM below 5315).
FINS: 2476, 2499 and 2619
FRACAS: 494
Date Issued: 10/05
U301
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
Page 1 of 2
SAFETY BULLETIN
C316 and C318C317 and C319
Location of C316, C317, C318 and C319 on the bottom
side of 280066-001 PCB
C317 and C319
C316 and C318
FINS: 2476, 2499 and 2619
FRACAS: 494
Date Issued: 10/05
Location of C316, C317, C318 and C319 on the bottom
side of 271838-001 PCB
Bose Corporation; The Mountain, Framingham, Ma. 01701-9168
Service documentation available on-line at http://serviceops.bose.com
Page 2 of 2
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