4-16 Service Guide N5227-90001
Troubleshooting PNA Series Microwave Network Analyzers
Front Panel Troubleshooting N5227A
Checking the A2 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 “Removing and Replacing the
A1–A3 and Other Front Panel Subassemblies” on page 7-8.
A1 Front Panel Interface Board
This assembly performs the following functions:
• It routes USB signals between the front-panel USB connector and the A21 CPU board.
• The speaker produces the audio output from signals supplied by the A21 CPU board.
• It routes key pad commands from the keypad to the A21 CPU board.
• It routes display signals from the A21 CPU board to the A3 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. Refer to “Removing
the A1 Front Panel Interface Board and Keypad Assembly” on page 7-8.
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 “A3 Display Test” on page 4-15.
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