Keysight Technologies Infiniium 90000A Series, Service Manual

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52 90000 A-Series Service Guide
4
Troubleshooting
Pressing [Multi Purpose] on the front panel illuminates all the LEDs, and pressing
[Clear Display] turns off all the LEDs.
4
When you are finished, click Close .
If any of the LEDS do not work, go to “ LED Troubleshooting ” later in this chapter.
To verify correct touch screen operation:
1
Click Utilities > Self Test... .
2
Select Touch Screen Test from the Available Self Tests drop-down list box, then
click Start and follow the on-screen instructions.
If the touch screen is not working properly, go to “ Touch Screen Troubleshooting ”
in this chapter.
Run a user calibration
1
Complete a user calibration by following the procedures in Chapter 2 .
2
If the calibration test fails, look at the details to find the channel associated with
the failure.
• If the failure is not associated with channel 1, replace the acquisition board
associated with that channel (where channels 1 and 2 = bottom acquisition
board, channels 3 and 4 = top acquisition board).
• If the failure is associated with channel 1, look at the specific calibration that
failed. If it was a trigger cal, a timebase cal, or an interpolator gain cal,
replace the backplane board because it is likely the problem. If the cal still
fails, replace the bottom acquisition board.
• If the failure is associated with channel 1 but is not a trigger cal, a timebase
cal, or an interpolator gain cal, replace the bottom acquisition board. If the
cal still fails, replace the backplane board.
• If all four channels have cal failures, the problem may be with the calibrator
located on the backplane board, so replace the backplane board first.
Verify system performance
After you have verified the basic operation of the oscilloscope, you need to verify
that it meets all warranted specifications by following the procedures in the
“ Testing Performance ” chapter.