A2 Display Test - Agilent Technologies N5230A Service Manual

Troubleshooting
Front Panel Troubleshooting
Checking the RPG (Front Panel Knob)
To check the RPG knob, rotate the knob and check for a fluid movement of numbers in the
box.
Velocity
• If the movement of numbers in the
all, suspect a faulty A3 front panel interface board. To replace the A3 front panel
interface board, refer to

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.
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. They are
about the size of a small pin point. Damaged pixels can be either "stuck on" or "dark."
• A "stuck on" pixel is red, green, or blue and is always displayed regardless of the display
setting. It will be visible on a dark background.
• A "dark" pixel is always dark and will be displayed against a background of its own
color.
How to Run the Display Test
To run the display test, perform the following:
On the menu, point to
System
A multi-color screen is displayed. Be prepared to look for the symptoms described in
to Identify a Faulty Display,"
test, click the moving
display. After the test is completed, the display defaults to the network analyzer screen.
How to Identify a Faulty Display
One or more of the following symptoms indicate a faulty A2 display assembly:
• a complete row or column of "stuck on" or "dark" pixels
• more than six "stuck on" pixels (but not more than three green)
• more than twelve "dark" pixels (but not more than seven of the same color)
• two or more consecutive "stuck on" pixels or three or more consecutive "dark" pixels (but
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
A2 Display Assembly" on page
4-18
Velocity
"Removing the A3 Front Panel Interface Board" on page
4-12.
, and then click
Service
and then click the
button. The button moves to allow you to see all of the
Next Test
7-10.
PNA Series Microwave Network Analyzers
box is not smooth or no numbers appear at
"Troubleshooting LCD Display
.
Display Test
button. To continue to the next
Start Test
Service Guide N5230-90014
N5230A
7-10.
"How
"Removing the