54 S-Series Oscilloscopes Service Guide
4 Troubleshooting
front panel power button. (Or, you can perform a hard shutdown by holding the
power button down for 5-6 seconds so the power turns off, and then pressing the
power button again to restart the oscilloscope.)
If it turns off again, look through the rear fan slots to see the upper right corner of
the acquisition board (as viewed from the rear of the oscilloscope). A series of LEDs
is located in this corner of the acquisition board. Refer to the Power Supply
Troubleshooting section (page 58) of this chapter for more information on
decoding these LEDs.
Check the display
If the screen is black or has a scrambled display, go to the “Display
Troubleshooting” section of this chapter.
Run the oscilloscope self tests
Running the oscilloscope self tests performs a series of internal procedures to
verify that the oscilloscope is working properly.
1 Click Utilities > Self Test....
2 Select Scope SelfTest from the Available Self Tests drop-down list box.
3 Click Start and follow the instructions on the screen.
If any of the self tests fail, replace the acquisition board.
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