Service Guide N5230-90024 5-23
PNA Series Microwave Network Analyzers Theory of Operation
N5230C Digital Processing and Digital Control Group Operation
Front Panel Subgroup
The front panel subgroup contains the following assemblies:
• A1 Keypad Assembly
• A2 Display Assembly
• A3 Front Panel Interface Board
A1 Keypad Assembly
The A1 keypad assembly provides user interface to the analyzer. The front panel rotary pulse generator
(RPG) knob is not electrically connected to the keypad, but rather provides user inputs directly to the front
panel processor.
A2 Display Assembly
The A2 display assembly contains an 8.4 inch LCD with associated drive circuitry and backlight inverter. Two
cables between the A2 display assembly and the A3 front panel interface board provide all necessary power
and data for normal operation. The two cables are:
1. A cable to the inverter that supplies buffered power.
2. A cable to the display circuitry that supplies decoded data from the video processor on the A15 CPU
board and the necessary drive circuit power. The video data received from the A15 CPU board includes
the following:
A3 Front Panel Interface Board
The A3 front panel interface board detects and decodes user inputs from the A1 keypad assembly and front
panel knob, and transmits them to the A15 CPU board by way of the A14 system motherboard. It also
decodes video data from the video processor on the A15 CPU board and supplies this to the A2 display
assembly. Power from the power bus on the A14 system motherboard is buffered and routed to the A1
keypad assembly and the A2 display assembly. All data and power signals are routed through a single cable
connector to the A14 system motherboard.
The A3 front panel interface board also includes the following items:
• digital TTL horizontal sync • digital TTL blue video
• digital TTL vertical sync • blanking
• digital TTL red video • data clock
• digital TTL green video
USB Two universal serial bus (USB) jacks (industry standard 4-pin connectors) mounted on a
separate USB connector board that connects directly to the A3 front panel interface board.
Speaker A speaker that emits the audio signals received from the A15 CPU board.
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