Service Guide N5230-90024 4-17
PNA Series Microwave Network Analyzers Troubleshooting
N5230C Rear Panel Troubleshooting
Rear Panel Troubleshooting
Each rear panel connector is associated with a hardware group in the analyzer. You can use the data at these
rear panel connectors to help troubleshoot these hardware groups in addition to testing the connectors.
The connectors discussed in this section are:
•USB
• SERIAL (RS-232)
• PARALLEL (1284-C)
•VGA
•GPIB
•LAN
Checking the USB Ports
NOTE The rear panel contains five USB ports; one “stand-alone USB port” on the CPU board and a
“group-of-four” connected to a separate hub.
To verify proper operation of any 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, remove the non-working USB device, wait 15 seconds, and then
reconnect the device to the USB port.
• If the device still does not perform correctly, remove the USB device and connect it to the front panel
USB.
NOTE If the front panel USB port does not work, refer to “A3 Front Panel Interface Board” on
page 4-16.
• If the USB device has been verified to work on the front panel but not on the stand-alone USB port:
— Then the A15 CPU board is faulty. Refer to “Removing and Replacing the A15 CPU Board” on
page 7-20.
• If the USB device has been verified to work on the front panel but not on one of the “group-of-four” USB
ports:
— Then the rear panel hub is faulty. Refer to “Removing and Replacing the A16 Test Set Motherboard
and the USB Hub” on page 7-24 for replacing the rear panel hub board.
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