Chapter 3 — Theory of Operation
44 CV30 Fixed Mount Computer Service Manual
• An RJ45 connector for connecting a 10BaseT/100BaseT Full Duplex
standard Ethernet interface to the CV30. The magnetic portion of the
circuit is placed here.
The CV30 I/O board is connected to the MLB via the 50P wire harness
connection. All differential signals were wired in twisted paired manner.
Inverter Board
The inverter board functions as the backlight source to power up the CCFL
of the LCD Module. This circuit is designed to power up two CCFLs to at
least 350 NIT brightness level on the LCD. The backlight is also user
adjustable. This board is connected to the main logic board with a 10P wire
harness connection.
Touch Heater Board
The Touch Heater board consists of these circuits:
• Power supply to the touch panel heater
• Touch panel controller circuit
• Interface to the Keypad board
This board is connected to the main logic board with the 50P wire harness
connection. The differential signal for the speaker is wired in a twisted-pair
manner.
Keypad Board
The keypad board was designed with a pattern as the switch for the console
buttons. There are 5 console buttons, which are uniquely assigned to
certain functions including magnification, brightness, volume up, volume
down, and a power button used to put the unit into suspend/wakeup. This
board also provides an interface to the LED board, internal speaker, and the
audio jack connector. The keypad board is connected to the touch heater
board with a 22P flex cable.
Radome Board
The radome board consists of two antennas that provide the antenna feed
which is soldered onto the board. These antennas are the 2.4 Ghz antennas
designed for the 802.11 b/g radio. There is also a switching circuit designed
to detect the existence of an external antenna when connected. The external
antenna can be connected to the CV30 by an SMA connector on the
radome daughter board which is part of the radome cover. The radome
daughter board connects to the radome board with an RF coaxial cable.
The radome board is connected to the MLB with a 6P wire harness.
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