To Check The Leds - Agilent Technologies Infiniium 90000 A Service Manual

Chapter 4: Troubleshooting

To check the LEDs

To check the LEDs

If you see a failure with the on/off switch backlight LED, replace the ON/OFF board. If the LED
will still not illuminate, replace the motherboard and see if this fixes the problem. If the LED
still does not work, the last option is to check the on/off cable connecting the ON/OFF board
to the motherboard.
If any of the other LEDs are not working on the front panel, the first step is to trouble shoot the
acquisition assemblies to make sure they are working. If they are working then replace the
keyboard assembly and see if the LEDs will illuminate. If the LEDs will not illuminate, the last
step is to reload the oscilloscope software.
When reassembling the oscilloscope all boards that were replaced, but turned out not to be
causing the problem should be reinstalled in the oscilloscope.
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