4-16 Service Guide N5230-90024
Troubleshooting PNA Series Microwave Network Analyzers
Front Panel Troubleshooting N5230C
Checking the USB Board
To verify proper operation of the USB board:
• Connect a known good USB device, such as a USB mouse, to a front panel USB port.
• Wait 15 seconds for the analyzer to verify the device connection, and then check the operation of the
USB device.
• If the device performs correctly, the USB board is functioning properly.
• If the device does not perform correctly, the USB board is faulty. Refer to “Replacing the USB Connector
Board” on page 7-12.
A3 Front Panel Interface Board
This assembly performs the following functions:
• It routes USB signals between the front-panel USB connector and the A15 CPU board.
• The speaker produces the audio output from signals supplied by the A15 CPU board.
• It routes key pad commands from the keypad to the A15 CPU board.
• It routes display signals from the A15 CPU board to the A2 display assembly.
Checking the Speaker
If no audio is heard:
• Verify that the volume is set correctly and the proper sound driver is loaded; do the following:
— Press UTILITY , then , then .
•Click on the
Sounds and Audio Devices entry. Follow the normal Windows procedure to check the sound
drivers and volume. If the audio is still not heard, suspect a faulty speaker located on the A3 front panel
interface board. Refer to “Replacing the A3 Front Panel Interface Board” on page 7-12.
Checking the Operation of the Key Pad Commands
To verify the key pad functionality, refer to “Front Panel Keypad and RPG Test” on page 4-13.
Checking the Display
To verify the display functionality, refer to “A2 Display Test” on page 4-15.
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