Bose 3-2-1 Manuel de dépannage - Page 10

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Bose 3-2-1 Manuel de dépannage
Row Signal
KEYOUT
KEYOUT
2
1
0
0
0
0
0
1
0
1
1
0
1
0
3.2.3 IR Receiver
The 321 Series II console includes a narrow-band IR receiver module. The IR receiver gets the
IR signal from the remote control and passes it to the Main board via the Button board. The IR
signal information enters the Main board at J6700 pin7.
The console is capable of being controlled by the universal IR remote controls (basic and
premium) developed specifically for the 3
which either include the 3
mote). A narrow-band IR receiver module is provided on a printed circuit sub-assembly to
permit mounting in the front of the console. This module amplifies the incoming IR data stream
and removes its 37.9 kHz AM sub-carrier. The CS98200 handles the decoding of inbound
control commands from IR receiver module. Hardware assistance/noise filtering is provided in
the chip for this.
3.2.4 DVD Driver
J3200 [sheet 7, B/C5] is the connector for the DVD ROM driver which connects to the ATAPI
bus on Main board. The DVD ROM provides video source and one of the internal audio sources.
It can be configured either master or slave mode and share same ATAPI bus and reset signal
with HDD but with separate select signal.
3.2.5 Hard Disk Driver
J9341 [sheet 7, B/C4] is the connector for the hard disk driver (HDD) which connects to the
ATAPI bus on Main board. The DVD ROM provides one of the internal audio sources. It can be
configured either master or slave mode and share same ATAPI bus and reset signal with DVD
ROM but with separate select signal. HDD is only populated on premium product.

3.3 Ethernet

•
•
The 3
2
1 Series II premium console includes an Ethernet connector J9640 [sheet 9, B/C2] and
a Cirrus CS8900A 10baseT Ethernet Controller IC U9641 [sheet 9, B/C6] which interfaces to the
CS98200 via the parallel Host bus. Since this bus is timeshared with the ATAPI drives, RISC0 is
expected to handle all interactions with the chip, providing essentially a transmit and receive
FIFO for RISC1 to use for sending/receiving Ethernet packets, as well as a software API for
high-level control of the chip (power up/down, etc.).
The LINK LED, LAN LED and isolation transformer are included inside the Ethernet connector,
J9640, visible from the back of the console. The green LED (D9640) is connected directly to
the LINK LED output of the CS8900A Ethernet Controller IC (U9641) via R9656. The yellow
LED is directly connected to the LAN LED output via R9657.
THEORY OF OPERATION
Column Signal
KEYOUT
KEYIN
0
1
1
0
1
1
0
0
0
1
0
0
0
1
•
•
2
1 Series II, as well as 3rd party remote controls
•
•
2
1 II codes or can learn them (such as a Crestron universal re-
10
Button Name
KEYIN
0
1
ON/OFF
0
"+" (VOL_UP)
1
SOURCE
0
ENTER (labeled
STORE on
premium console)
"-" (VOL_DN)
1
0
EJECT
Button
Position
1 (Left)
4
2
5
3
6 (Right)