A3 Display Test - Keysight N5227A Service Manual

PNA Series Microwave Network Analyzers
N5227A
Checking the RPG (Front Panel Knob)
To check the RPG knob:
1. Press the UTILITY
Preset
1. Rotate the knob and check for a fluid movement of numbers on the analyzer display.
1. 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
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.
NOTE If the display is dim or dark, refer to
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, black, or red 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
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 A3 display assembly is determined to be faulty, replace it. Refer to
Assembly and the Touchscreen" on page
Service Guide N5227-90001
key.
, then , then
Service More
7-9.
"Removing the A1 Front Panel
7-8.
"Troubleshooting LCD Display Problems" on page
Display Test
, then .
"Removing the A3 Display
Troubleshooting
Front Panel Troubleshooting
4-12.
"How to Identify a
4-15