4-22 Service Guide E8361-90001
Troubleshooting PNA Series Microwave Network Analyzers
Rear Panel Troubleshooting E8361A
Checking the SERIAL (RS-232), PARALLEL (1284-C), or VGA Port
To verify the proper operation of the SERIAL, PARALLEL, or VGA port:
• Connect a known good serial, parallel, or VGA peripheral device.
• Wait 15 seconds for the analyzer to verify the device connection, and then check the
operation of the peripheral device.
• If the peripheral device performs correctly, the port is functioning properly.
• If the peripheral device does not function properly, the A15 CPU board is faulty. Refer to
“Removing and Replacing the A15 CPU Board” on page 7-28.
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