BOSE AMPLUS SUPPLEMENT S5 Schematic

Supplement

AmPlus

As a result of a vendor change in the design of the TDA7294 amplifier IC, the AmPlus 50 and 100
amplifier PC board, part number 187932, has been re-designed and changed to rev. 5.

This change affects the AmPlus 100 amplifier PC board assemblies, part numbers 187917-001
and -002 and the AmPlus 50 amplifier PC board assemblies, part numbers 187923-001 and -002.
Refer to the table below for a listing of the parts affected on these assemblies.

Remove the rev. 5 schematic and layout diagram sheets from this supplement and insert them
and this page into your AmPlus 50 and 100 amplifier service manual, part number 194101.

Units built with rev. 4 and earlier PCBs will not be affected, but should be reworked using the
procedure in the AmPlus amplifier service bulletin 194101-B2 if they have no output as the result
of a failed TDA7294 amplifier IC.

Reference

Designator

D506 BAV99, SOT23 147239 Deleted
D514 BAV99, SOT23 147239 Deleted 1
D530 Diode, Schottky, 1A 257661 Added
D531 Diode, Schottky, 1A 257661 Added
D532 Diode, Schottky, 1A 257661 Added 1
D533 Diode, Schottky, 1A 257661 Added 1

50 and 100 Amplifiers

Description Part Number Change Note

TM

Notes:

1. This part is not used in the AmPlus 50 amplifier.

Date Issued: 10/2000
FRACAS: 291
ECN: 28175

©

2000 Bose Corporation

Supplement

Part Number 194101-S5