Keysight E4980A - To Check the Front Panel; To Check the LCD

48 Keysight E4980A/E4980AL Precision LCR Meter
Troubleshooting
Function Specific Troubleshooting
4-
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].
• 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.
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].
• 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.
Bias current interface
(Option E4980A-002)
The interface to connect the 42841A (Bias
Current Source).
Refer to in “To Check the
Bias Current Interface
Function (Option 002
only)” on page 60.
Table 4-3 Major functions and troubleshooting procedures
Function Description Troubleshooting