Chapter 7 159
Troubleshooting the Processor, Power Supply, and Display
Front Frame Description
Front Frame Description
Purpose. The front frame assembly contains the following four
assemblies.
A1 LCD Display
The LCD display assembly provides annotation, graticule, and trace
information, as processed by the CPU though the A2 Front Panel
Interface board.
A3 Keyboard
The keyboard allows entry of keyboard characters, immediate
activation of some features including the print, restart, and display
navigation features, and selection of some softkey menus.
A2 Front Panel Interface Assembly
The front panel interface board interprets which key has been pressed,
and provides voltage supplies to the inverter boards, the RPG tuning
circuitry, and the probe power bias voltage outputs. The front panel
interface assembly is comprised of three boards. The A2A1 and A2A2
Inverter boards are identical. The inverter boards provide a stepped-up
voltage to both backlights on the LCD display.
A23 Disk Drive
The disk drive is used to download information from a 3.5 inch floppy
disk to instrument memory, and to load information from the
instrument onto a floppy disk.
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