Agilent Technologies Infiniium 90000 A, Service Manual

Page: 54 / 148

Chapter 4: Troubleshooting
Primary Trouble Isolation
54
Primary Trouble Isolation
A
Perform power-up.
Connect the oscilloscope power cord and press the power button in the lower left corner
of the front panel. If the oscilloscope is working properly, it will start up and the graticule
will appear on the screen. The exact appearance may vary depending on the setup
selected before the oscilloscope was turned off.
Figure 4-1
Power-on Display
B
If the oscilloscope shuts down without you pressing the front panel power button,
unplug the AC power cord from the rear of the instrument and wait 30 seconds for the
+5V standby supply to completely discharge. Then plug the AC power cord back into
the oscilloscope, press the front panel power button, and count how many seconds it
takes for the oscilloscope to shut off again.
1 If it takes approximately two seconds for the scope to lose power, go to the “Under-voltage
Fault” section in this chapter.
2 If it takes four seconds or more for the scope to lose power, go to the “Over-temperature
Fault” section in this chapter.
3
If the scope never powers up or shuts off almost immediately, go to the “Over-voltage
Fault” section in this chapter.
4 If all the steps within these sections have been followed and the oscilloscope still does
not turn on, go to the “Motherboard Verification” section in this chapter.
5 When the scope is fixed and remains powered up, proceed to step C.
C
Once the oscilloscope will remain powered up, run the oscilloscope self-tests.
1
Select Self Test from the Utilities menu (these are discussed in detail starting on page 80).
2 Select Scope Self Tests from the Self Test drop down list box.
3 Click the Start Test button and follow the instructions on the screen.
If any of the selftests fail, go to the Acquisition Trouble Isolation troubleshooting flowchart
later in this chapter for further troubleshooting. Otherwise, go to step D.