Chapter 3 — Theory of Operation
CV30 Fixed Mount Computer Service Manual 43
Touch Panel and Touch Heater
A touch panel is placed on top of the touch heater and framed by the
rubber boot. This unit block is placed above the LCD module. Both the
touch heater and touch panel are connected to the touch heater board via
individual flex cables.
Main Logic Board
The main logic board consists of a various circuits including the power
supplies, core logic, and interfaces to the other supporting boards.
The key components contributing to the major functionality are as follows:
• CPU: Intel PXA270 520 Mhz processor
• SDRAM: 128 MB SDRAM
• Flash ROM: 128 MB DiskOnChip® flash memory
• VGA (640x480) graphics controller
• Real time clock (RTC)
• Audio Codec
• Class 1 Bluetooth module
• 10/100 BaseT Ethernet controller
• USB 2.0 hub controller
• Battery charger to the backup battery
• A PIC controller
• One Secure Digital (SD) card slot
• One compact flash (CF) Type I/II Card Slot (for 802.11b/g radio only)
• Interface to the touch controller board
• Interface to the I/O board supporting peripheral interface
• Interface to the inverter board on backlight control
• Interface to the radome Board for the WLAN antenna switching and
RESET function
I/O Board
This board consists of the input/output peripheral interface as follows:
• Two RS-232 serial COM ports with 2 D-Sub 9-pin male connectors.
The TI MAX3243 transceiver chip is used for these two serial COM
circuits.
• A single D-Sub 15-pin male connector customized for the connection of
two USB hosts and a USB client.
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