Usb Interface Not Working; Front Panel Interface - Keysight Technologies X Series Service Manual

Front Panel Assembly
Troubleshooting
LED Blink Test Failures
If any of the front panel status LEDs do not work use the following procedure to
isolate the problem:
1. Remove the front panel from the instrument while leaving W1 connected
2. Activate the LED Blink Test by pressing Utility, Instrument Info, Front
3. Referring to
Table 7-2
4. If any of the control lines do not have the expected pulses on them replace

USB Interface Not Working

If there is a problem with the front panel USB connectivity see the
section in

Front Panel Interface

The A6A1 Front Panel Interface board has an initialization routine that it goes
through when the instrument is powered on. During this initialization routine,
different lower level functions are initiated and verified. If the initialization
routine can complete the communication and major component functionality is
most likely not at fault.
Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
to both the instrument and the front panel assembly. See
"Assembly Replacement,"
the A6 Front Panel assembly.
Panel Tests, LED Blink Test.
Figure 7-2, probe each of the LED control lines on A6A1 J5
listed in Table 7-2 with an oscilloscope and verify that the levels indicated
are present.
Status LED Control Line Expected Levels
A6A1 J5 Pin #
22
23
27
the A6A1 Front Panel Interface board.
If all the control lines have the expected pulses, yet there are LEDs that are
not working, replace the A6A4 Keyboard.
Chapter 6, "Troubleshooting"
for instructions on how to remove and replace
LED
Mod On/Off
More
RF On/Off
Chapter 15,
Expected Level
(+/-10%)
+3.2 V Pulses
+3.2 V Pulses
+3.2 V Pulses
"USB"
163