BOSE 268795-B1 Schematic

SERVICE BULLETIN

Bulletin Part Number: 268795-B1

®

Product: Lifestyle

Subject: Failed output ICs U1, U2, and U3.

Disposition: If U1, U2, or U3 fails in a PS18, PS28 or PS48 bass module that has amp PCB 266999-0, replace

the amp PCB with part number 267332-0, which has improved output ICs.

Note: The improved outputs ICs U1, U2, and U3, part number 267330-001 are not compatible with the older
amp PCB part number 266999-0. Phase in of the new amp PCB began in November 2003 and was completed
in January 2004.

18, 28, 35 Bass Module - PS18, PS28, PS48

Earlier production amp PCB part number: 266999-0
U1, U2, U3 identification markings: TDA7265

Later production amp PCB part number: 267332-0
U1, U2, U3 identification marking s: LM4766T

ECN: 33251
FRACAS: 362

Date Issued: 03/2004

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

Service documentation available online at http://serviceops.bose.com