Agilent Technologies N5230A, Service Manual, Page: 89 / 262

Service Guide N5230-90014 4-19
PNA Series Microwave Network Analyzers Troubleshooting
N5230A Front Panel Troubleshooting
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 supplies power to the two front-panel probe power connectors.
• It routes key pad commands from the A1 keypad to the A15 CPU board.
• It routes display signals from the A15 CPU board to the A2 display assembly.
Checking the USB Port
To verify proper operation of the USB port:
• Connect a known good USB device, such as a USB mouse.
• 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 port is functioning properly.
• If the device does not perform correctly, the USB port is faulty. Refer to “Removing the
A3 Front Panel Interface Board” on page 7-10 .
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:
— On the
System
menu, point to
Configure,
and then click
Control Panel
.
— Click the
Sounds and Multimedia
icon. 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 A3 Front Panel Interface Board” on page 7-10 .
Checking the Probe Power Connectors
To verify the probe power operation, refer to “Power Supply Check” on page 4-7 .
Checking the Operation of the Key Pad Commands
To verify the key pad functionality, refer to “A1 Front Panel Keypad and RPG Test” on
page 4-16 .
Checking the Display
To verify the display functionality, refer to “A2 Display Test” on page 4-18 .