To Check The Front Panel; To Check The Lcd - Keysight E4980A Service Manual

Troubleshooting
Function Specific Troubleshooting
Table 4-3 Major functions and troubleshooting procedures
Function
Bias current interface
(Option E4980A-002)

To Check the Front Panel

Procedure
Randomly press the front panel keys to verify that they work normally.
Step 1. Press [System] - SELF TEST
Step 2. Use the cursor key to highlight the selection item to the right of "TEST No.".
Step 3. Select 4 KEY using the INCR+ or DECR- softkey.
Step 4. Press EXECUTE - TEST START.
Step 5. Randomly press the front panel keys. The key name of the pressed key is
displayed.
Step 6. To exit the front panel test, press TEST STOP three times consecutively, and
then press [Return].
•
•

To Check the LCD

Procedure
Step 1. Press [System] - SELF TEST
Step 2. Use the cursor key to highlight the selection item to the right of "TEST No.".
Step 3. Select 5 DISPLAY using the INCR+ or DECR- softkey.
Step 4. Press EXECUTE - TEST START. The whole of the LCD screen turns Red, Green,
Blue, Black, and White every 2 seconds.
Step 5. To exit the DISPLAY test, press TEST STOP, and then press [Return].
•
•
48
Description
The interface to connect the 42841A (Bias
Current Source).
If multiple keys fail to work, a problem in key function (keypad, key flex
circuit) or display interface board.
If only a specific key doesn't work, check first if the key is subsided in the
panel.
If the LCD display has a problem, check the LCD and the display interface
board.
If the LCD is not illuminated with backlight, check the inverter board.
Troubleshooting
Refer to in
Bias Current Interface
Function (Option 002
only)" on page
Keysight E4980A/E4980AL Precision LCR Meter
"To Check the
60.