A3 Display Test - Agilent Technologies N5242A Service Manual

PNA Series Microwave Network Analyzers
N5241A/42A
Checking the RPG (Front Panel Knob)
To check the RPG knob:
1. Press the UTILITY
2. Rotate the knob and check for a fluid movement of numbers on the analyzer display.
3. If the movement of numbers is not smooth or no numbers appear at all, suspect a faulty
A1 front panel interface board. To replace the A1 front panel interface board, refer to
"Removing the A1 Front Panel Interface Board and Keypad Assembly" on page

A3 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.
If the display is dim or dark, refer to
NOTE
Problems" on page
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 pixel that has a constant blue, green, red, or black appearance that will
not change.
How to Run the Display Test
To run the display test, perform the following:
Press UTILITY
System
A multi-color screen is displayed. Be prepared to look for the symptoms described in
to Identify a Faulty Display."
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 A3 display assembly is determined to be faulty, replace it. Refer to
A3 Display Assembly and the Touchscreen" on page
Service Guide N5242-90001
key.
Preset
4-12.
, then , then
Service
Follow the instructions on the screen.
"Troubleshooting LCD Display
Display Test
, then
More
7-12.
Troubleshooting
Front Panel Troubleshooting
7-10.
.
"How
"Removing the
4-15