Bose Companion 3 Series II Service Manual page 36

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
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.
Solution: All units that come in for repair, replace C7 using the part number listed in the table
below. For assembly/disassembly procedures, please refer to Service Manual
271885-SM (Companion
(Companion
Variant
Euro/Japan
Ref Des
C7
FINS: 2784
Date: 11/07
3 Multimedia Speaker System
®
3 Series II Multimedia Speaker System).
®
US 33000 µF, EL, AL, 25V, 4T
39000 µF, EL, AL, 25V
Bose Corporation; The Mountain, Framingham, Ma. 01701-9168
Service documentation available online at http://serviceops.bose.com
3 Multimedia Speaker System) or 297700-SM
®
Description Part Number
260693-3331E
260693-3931E
Good Part Bad Part
United
Aishi
Chemi-Con