Theory of Operation
3-2
TLA5000 Series Service Manual
internal LCD display signal when used with the Windows 2000 Proffessional
operating system.
H Power Distribution and Miscellaneous Circuitry. The power supply circuitry
on the interface board generates the majority of the 2.5 V needed by the
acquisition circuitry. The interface board also provides the interface between
the front panel keypad and knobs, the On/Standby switch, main power
supply, and the mother board.
The power supply is a switching power converter with active power factor
correction. It supplies power to all of the circuitry in the logic analyzer. The
power is distributed to the PC interface board and to the hard disk drive
connectors.
The fan assembly provided forced air cooling for the logic analyzer and are
controlled by the microprocessor.
The front panel keypad consists of a full QWERTY keypad. The keypad
connects to the mother board through one of the internal USB connections. The
front panel keypad is active simultaneously with an optional external keyboard.
Five front panel knobs provide the following manual controls:
H Two horizontal and vertical sizing knobs
H Two horizontal and vertical position knobs
H One multifunction knob
The internal display is a 10.4-inch diagonal Active Matrix Thin-Film-Transistor
(TFT) liquid crystal display (LCD) with a built-in back light. The color LCD is
supported by an external DC switching regulator board to provide the back-light
voltage and a display adapter board which supports connector interfacing from
the the PC interface board and to the On/Standby front panel switch.
The internal hard disk drive is a standard 3.5-inch IDE drive which interfaces
directly to the mother board through a standard UDMA 80 conductor cable. The
hard disk drive is not removeable. The CD drive uses the slot on the secondary
IDE interface.
The floppy disk drive is a standard 1/2-inch drive supporting 3.5-inch 1.44
MByte high-density double sided floppy disks. The drive is an internal USB
floppy disk drive.
Power Supply
Fans
Front Panel Keypad and
Knobs
Display
Hard Disk Drive
Floppy Disk Drive
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