Specifications

Chapter 4: Troubleshooting
Primary Trouble Isolation
50
Figure 4-4 LED test screen
3 Repeatedly press [Single] 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 screen. Verify that the corresponding
LEDs on the front panel are the only ones illuminated. Additionally, pressing
the Multi- purpose button on the front panel will illuminate all the LEDs, and
pressing the Clear Display button on the front panel will turn off all the LEDs.
4 When you are finished, click Close.
5 If any of the LEDs do not work, go to “LED Troubleshooting” later in this chapter.
6 If both tests pass, make sure the touch screen and probes work properly and
then go to step E.
E Run a self calibration.
1 Complete a self 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 fail.
• 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 lower 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 lower acquisition board. If the cal
still fails, replace the backplane board.
• If the failure is not associated with channel 1, replace the acquisition board
associated with that channel (channels 1 and 2 - lower acquisition board,
channels 3 and 4 - upper acquisition board).
• If all four channels have cal failures, the problem may be with the calibrator
located on the backplane board, so replace that board first. If the calibration
test passes, go to step F.
F The system is operational. Verify that the oscilloscope meets all warranted specifications
by following the procedures in the “Testing Performance” chapter.