Technical data

Service Guide N5230-90025 4-15
PNA Series Microwave Network Analyzers Troubleshooting
N5230C Front Panel Troubleshooting
Checking the RPG (Front Panel Knob)
To c heck t h e RPG kn o b :
1. Press the UTILITY key.
2. Rotate the knob and check for a fluid movement of numbers on the analyzer display.
• If the movement of numbers is not smooth or no numbers appear at all, suspect a faulty A3 front panel
interface board. To replace the A3 front panel interface board, refer to “Replacing the A3 Front Panel
Interface Board” on page 7-12.
A2 Display Test
The display should be bright with all annotations and text readable. The display test allows you to check for
non-functioning pixels and other problems.
NOTE If the display is dim or dark, refer to “Front Panel Troubleshooting” on page 4-12.
What Is a Damaged Pixel?
A pixel is a picture element that combines to create the image on the display. A pixel is about the size of a
small pin point.
A damaged pixel is:
• A pixel that has a constant blue, green, or red appearance that will not change, or
• a pixel that has a constant black appearance that will not change.
How to Run the Display Test
To run the display test, perform the following:
Press UTILITY , then , then , then .
A multi-color screen is displayed. Be prepared to look for the symptoms described in “How to Identify a
Faulty Display.” Follow the instructions on the screen.
How to Identify a Faulty Display
A display is considered faulty if:
• More than 0.002% of the total pixels have a constant blue, green, red, or black appearance that will not
change.
• Three or more consecutive pixels have a constant blue, green, red, or black appearance that will not
change.
• If the A2 display assembly is determined to be faulty, replace it. Refer to “Replacing the A2 Display
Assembly” on page 7-11.
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