System-Related Boards; I/O - Toshiba Aplio SSA-770A Service Manual

No. 2D730-148E*O
4.3 System-Related Boards
4.3.1 I/O
(1) Outline
The I/O board connects with various I/O devices (VCR, HDD, etc.) located both inside and
outside the system and the BP (Back Plane board) and transmits signals and power
between them. In addition, appropriate cable connections are provided using the required
shields and decoupling in order to meet EMI, RFI, and ESD requirements.
(2) Functions
The following functions are provided.
(a) Power
Power is supplied to external units such as the control panel, Physio module,
microphone, EIDE unit (HDD), and USB port.
(b) Video
System monitor output, S-Video input/output, RGB output, and C-Video output from
the VI board are performed.
(c) Audio
The following signals are output from the VI board.
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Speaker audio output and headphone audio output.
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Microphone audio output.
(d) Speakers
The system speaker signals from the VI board in the audio power amplifier are output
to the system speakers (one pair of tweeters and one pair of woofers).
(e) Communication/control
The following interface functions are provided.
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USB hub and ports
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System reset signal input
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Front panel (for the user) and rear panel interfaces
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EIDE hard drive
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SCSI/RDD
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EthernetTl O/l 00
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Serial port (COMI)
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Parallel port (IEEE1284)
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Status LEDs
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