Chapter 4 41
Troubleshooting
Function Specific Troubleshooting
4. Troubleshooting
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.
To Check the Front USB port
Procedure
Step 1. Plug a USB memory, formatted with FAT16 or FAT32.
NOTE The following USB memory can be used.
Complies with USB 1.1; mass storage class, FAT16/FAT32 format; maximum consumption
current is below 500 mA.
Recommended USB memory: Agilent 512 MB USB Flash memory (Agilent PN
1819-0195).
Use the prepared USB memory device exclusively for the E4980A; otherwise, other
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