36 Impedance Analyzer
1 Troubleshooting
To Check the LCD
Procedure
Step 1.
Press key.
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
E4990A 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 E4990A rear panel.
• If the monitor screen view is the same as the LCD display, the
problem seems to be in the A60 CPU module.
• If only the LCD display has a problem, check the flat cable
between the A52 Front Panel I/F board and A60 CPU
Module.
• If the cables are normal, check the A51 LCD module.
To Check the External Keyboard
Procedure
Step 1.
Connect an external keyboard to the E4990A rear panel
USB port.
Step 2. Press key.
Step 3. Press and keys on the external keyboard,
and verify that the cursor on the menu bar moves up and down. If it
doesn’t work, the external keyboard or the A60 CPU Module may
be faulty.
To Check the Mouse
Procedure
Step 1.
Connect a mouse to the E4990A rear panel USB port.
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