6
Theory of Operation
PCB Assembly P/N
Main PCB
260318-0
IR PCB Part of 260318-0
Headphone PCB Part of 260318-0
Tuner PCB 260322-1
Keypad PCB 254141
1.0 Overview
The AV28 media center is a self-contained DVD/CD/MP3 disc player with an AM/FM tuner for use
with Bose
®
powered speaker systems. In addition to the two internal sources (DVD/CD and AM/
FM tuner), it allows playing up to four external audio sources: TV, VCR, AUX, and TAPE. A 27MHz,
one-way RF remote control operates the unit without line-of-sight restriction; provisions for infrared
remote control of the media center also exist. An integrated IR Blaster allows limited control of
other manufacturer’s equipment (TV’s, VCR’s and Cable/Satellite Set-Top boxes). The AV28 media
center has two independent audio output zones, accessible through circular DIN connectors in the
back of the product.
The AV28 media center contains five PCBs:
There are some components shown on schematics whose reference designators end in –NV;
these components are not loaded by manufacturing, but their pads exist on the PCB.
Block Diagram
U1
CS9800
DVD Decoder IC
Flash
VFD
DVD ROM
Drive
IR Blaster
Board
TV Power
Dongle
Power
Supply
Synch
IR
Receiver
Console
Buttons
UEI
Blaster IC
RF Remote
XCVR
Audio Path
Power
Supply
ETAP
ATAPI
DRAM
Video Path
AM / FM
Tuner
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