Bose 3-2-1 Handbuch zur Fehlersuche - Seite 21

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2.2 3

1 Series II Bass Module Details

The bass module contains all the active audio processing and amplification electronics of the

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1 Series II System. The rear end cap of the bass module provides access to the following

components:

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Line cord socket

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Power Switch (European only)

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System Connector (13-pin)

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Array Speaker Connector (DB9-S)

All the above components are mounted on the I/O Printed Circuit Assembly, part number

270926-001, which is, in turn, secured to the end cap via a metal bracket. The dash suffix is

used to denote the various AC voltage variants.

All other electronics reside on the DSP/Amplifier PCB Assembly. The DSP/Amp PCB is secured

to the extruded aluminum heat sink (which is glued to the back baffle of the module enclosure)

with a metal bracket. This bracket provides sufficient compression force to the PCB to maintain

good thermal contact to the heat sink of the audio power amplifiers, rectifier diodes, and pre-

regulator FET.

The power transformer for the system is directly mounted to the end baffle of the module above

the heat sink.

2.2.1 I/O Printed Circuit Assembly

Note: Refer to the Input/Output (I/O) PCB schematic diagram, 270926, for the following infor-

mation.

The I/O printed circuit assembly contains the AC input connector J1 [C4], the line switch S1 [D3]

and line fuse F1 [C3]. Connector J2/J5 [D2], depending on the dash (-xxx) variation, provides

the primary power connection to the power transformer. A location for a MOV (VR1 [C3]) is

provided, but is not populated in production.

Connectors J6 [B7] and J7 [D8] connect the I/O PCB to the DSP PCB. J6 connects to a 16-

position ribbon cable which carries the S/PDIF and audio inputs and control signals to/from the

DSP board. J7 connects to a 10-position cable that brings the array speaker amplifier outputs

and Vunreg/GND onto the I/O PCB. C7-9 provide RF ground coupling between the various

ground pins and structures on the board. C1, C3, C4, C5, and C10 are DC blocking caps on

the differential audio inputs and associated GND. C6 is the bulk storage capacitor for the

Vunreg supply. All of the signals described in section 3.1 are connected to the 13-pin system

connector J3 [B2] on this board.

2.2.2 DSP/Amplifier Printed Circuit Assembly

This board provides the following major functions:

Note: Refer to the DSP/Amplifier PCB schematic diagrams, 270921, for the following informa-

tion.

THEORY OF OPERATION