BOSE 271885-B4 Schematic
SERVICE BULLETIN
Bulletin Part Number: 271885-B4
®
Product: Companion
Subject: Poor reliability on vendor part
Disposition: On all units that come in for repair, replace C7 with a Chemi-Con capacitor
Symptom: No Audio, Dead Unit or No Symptom
Reason: The capacitor made by Aishi is made using a low quality foil and poor quality etching
Solution: All units that come in for repair, replace C7 using the part number listed in the table
3 Multimedia Speaker System
which is critical to the performance of an aluminum electrolytic capacitor. The
capacitor made by United Chemi-Con (UCC) is more dense and has more uniform
layering which makes the UCC capacitor more reliable.
below. For assembly/disassembly procedures, please refer to Service Manual
271885-SM (Companion
(Companion® 3 Series II Multimedia Speaker System).
®
3 Multimedia Speaker System) or 297700-SM
Ref Des
C7
Variant Description Part Number
US 33000 µF, EL, AL, 25V, 4T 260693-3331E
Euro/Japan 39000 µF, EL, AL, 25V 260693-3931E
Good Part Bad Part
FINS: 2784
Date: 11/07
United
Chemi-Con
Bose Corporation; The Mountain, Framingham, Ma. 01701-9168
Service documentation available online at http://serviceops.bose.com
Aishi
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