Keysight 9000 Series Service Manual page 58

Chapter 4: Troubleshooting
Primary Trouble Isolation
Figure 4
When you push a key
or turn a knob in
both directions, the
corresponding
symbol on this
screen turns green.
Knob and Key Self Test Screen
Use the following procedure to test the front-panel LED (light-emitting diode) indicators.
The LED test screen appears, which shows a symbolic representation of all front panel LED indicators.
See Figure 5.
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3 Press each key on the keyboard until you have pressed all keys.
4 When you press a key/knob, the bar above the corresponding key/knob symbol on the display
should change from red to green.
5 Turn each knob in both directions until you have turned all knobs.
6 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.
7 When you are finished, click Close.
8 If any of the knobs or keys do not work, go to "Keyboard Trouble Isolation Procedure" later in
this chapter.
1 Select Self Test from the Utilities menu.
2 Select LED Test from the Self Test drop-down list box, then click Start Test.