Tektronix TLA715 Series, Руководство по обслуживанию

Страница: 50 / 147

Theory of Operation
TLA715 Dual Monitor Portable Mainframe Service Manual
3- 3
The internal display is a 10.4-inch diagonal Active Matrix Thin-Film-Transistor
(TFT) liquid crystal display with a built-in back light similar to those found in
many notebook PCs. The color-cathode fluorescent back light can be dimmed to
60% of its value via a custom Tektronix screen saver or mainframe utilities
applet to extend its life and to prevent burning of the TFT LCD screen. The LCD
has an external DC switching regulator board to provide the back light high
voltage and a display adapter board which supports interfacing from the front
panel interface board to the LCD display.
The front panel key pad consists of a Hex keypad and a partial QWERTY
keypad. The front panel keypads are active simultaneously with an optional
external keyboard through an MC68HC705B16 front panel processor. The front
panel processor combines the two devices to generate and receive standard
keyboard scan codes from the system controller.
The front panel knobs include the following controls:
H
Detented horizontal size control
H
Detented vertical size control
H
Nondetented horizontal position control
H
Nondetented vertical position control
H
A nondetented multifunctional knob
A second MC68HC705B16 control panel processor and a custom WIN32 knob
API (DLL and VxD drivers) control the front panel knobs.
The trackball pointing device is a standard, off-the-shelf OEM PC pointing
device mechanically integrated into the mainframe. The trackball is simulta-
neously active with an external mouse through the USB. The external mouse
connects directly to the controller through a PS2 interface.
The hard disk drives (HDD) are standard 2.5-inch IDE drives which interface
directly to the system controller through an Enhanced Integrated Device
Electronics (IDE) extension of the PCI bus. The main HDD is easily removable
from the mainframe without removing any covers. The HDD is available in two
configurations: minimum and maximum (the sizes depend on the availability of
the hard disk drives).
The mainframe is electrically capable of accepting dual master-slave IDE HDD
configurations for a total of four drives (or other HDD devices) but is mechani-
cally limited to mounting two drives. The CD-ROM uses the A slot on the
secondary IDE interface which reduces the number of HDD devices to three.
LCD Display
Front Panel Controls
Hard Disk Drives