4-20 Service Guide E8361-90001
Troubleshooting PNA Series Microwave Network Analyzers
Front Panel Troubleshooting E8361A
no more than one set of two consecutive dark pixels)
• “stuck on” or “dark” pixels less than 6.5 mm apart (excluding consecutive pixels)
If any of these symptoms occur, replace the A2 display assembly. Refer to “Removing the
A2 Display Assembly” 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 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 7-12.
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 7-12.
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 4-17.
Checking the Display
To verify the display functionality, refer to “A2 Display Test” on page 4-19.
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