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1
Troubleshooting
To Check the LCD
To Check the External Keyboard
30
•
If the touch panel does not work correctly when the
hardkeys function normally, a failure seems to be in the
touch screen controller assembly or touch-panel LCD
assembly. (The touch panel is not replaceable
independently of the LCD.)
•
Check the cable between the touch screen controller and
the serial interface connector on the A80 CPU module.
•
If no problem is found in the above checks, a failure in the
A80 CPU Module is suspected.
Procedure
Step 1.
Press
Step 2.
Click Service - Display Test. The whole LCD screen
turns RED.
Step 3.
Tap anywhere on the LCD to go through the color test
screen of RED, GREEN, BLUE, WHITE and BLACK. You can also
use the rotary knob turned clockwise or press the ENTRY keys on
the Keysight E4991B front panel.
If the color test screen does not appear, perform Step 4.
Step 3.
Connect an external VGA monitor to the External
Monitor Output Port on the Keysight E4991B rear panel.
•
If the monitor screen view is the same as the LCD display,
the problem seems to be in the A80 CPU module.
•
If only the LCD display has a problem, check the flat cable
between the A52 Front Panel I/F board and A80 CPU
Module.
•
If the cables are normal, check the A12 LCD module.
Procedure
Step 1.
Connect an external keyboard to the Keysight E4991B
rear panel USB port.
Step 2.
Press
key.
key.
Impedance Analyzer
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Table of Contents
Troubleshooting
