To Check The Front Panel; To Check The Lcd; To Check The Front Usb Port - Keysight Technologies E4981A Service Manual

Troubleshooting
Function Specific Troubleshooting

To Check the Front Panel

Procedure
Randomly press the front panel keys to verify that they work normally.
Step 1. Press [System] -
Step 2. Use the cursor key to highlight the selection item to the right of "TEST No.".
Step 3. Select
Step 4. Press
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
[Return].
•
•

To Check the LCD

Procedure
Step 1. Press [System] -
Step 2. Use the cursor key to highlight the selection item to the right of "TEST No.".
Step 3. Select
Step 4. Press
Black, and White every 2 seconds.
Step 5. To exit the DISPLAY test, press
•
•

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: Keysight 512 MB USB Flash memory (Keysight PN
1819-0195).
Use the prepared USB memory device exclusively for the E4981A; otherwise, other
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SELF TEST
using the
4 KEY INCR+
-
EXECUTE TEST START
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.
SELF TEST
5 DISPLAY using the INCR+
-
EXECUTE TEST START
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.
or softkey.
DECR-
.
three times consecutively, and then press
TEST STOP
or DECR- softkey.
. The whole of the LCD screen turns Red, Green, Blue,
, and then press [Return].
TEST STOP
Chapter 4