Table of Contents
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Theory of Operation
RF Vector Network Analyzer
Front Panel Group
N9923AN
Digital Power Supplies
Digital power supplies on the A3 front panel interface board are driven by the Unreg DC
voltage from the A5 system board.
The 5 volts produced is used on the A3 front panel interface board and the A5 system
board.
The 3.5 volts produced is used on the A3 front panel interface board, the A5 system board,
and the A6 SOM board.
Both supplies are either on or off together except for power supply sequencing and are
controlled by the System Monitor Microcontroller on the A5 system board.
A2 LCD Assembly
The A2 LCD assembly contains a 6.5-inch, 640 x 480 TFT color LCD with associated drive
circuitry and backlight inverter.
The LCD backlight is created by LED's connected in parallel stacks. Backlight brightness
is a function of the backlight power that ranges from 22 to 27 volts. Refer to
"Backlight
Power" on page 5-5
for more information.
The backlight LED's are arranged along the top and bottom edges of the display. There are
three stacks on each edge.
5-6
Service Guide N9923-90005
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Table of Contents
Troubleshooting
