Keysight Technologies Infiniium 90000A Series, Service Manual

Page: 51 / 136

Troubleshooting
4
90000 A-Series Service Guide 51
4
Turn each knob in both directions until you have turned all knobs. When you
turn a knob in one direction, half the rotation arrow under the corresponding
knob symbol should turn green. When you then turn the knob in the other
direction, the entire rotation arrow under the knob symbol should turn green.
5
When you are finished, click Close .
6
If any of the knobs or keys do not work, go to “ Keyboard Troubleshooting ” later
in this chapter.
To test the front panel LED indicators:
1
Click Utilities > Self Test... .
2
Select LED Test from the drop-down list box, then click Start .
The Front Panel LED Test window appears, showing a symbolic representation
of all front panel LED indicators.
3
Repeatedly press the [Single] button on the front panel to step through and
highlight each LED symbol in the test screen. You can also step through the
LEDs by pressing the <<Prev or Next>> buttons on the display screen. Verify that
the corresponding LEDs on the front panel are the only ones illuminated.