Technical data

72 4000 X-Series Oscilloscopes Service Guide
4 Troubleshooting
Finally, this chapter describes procedures for
“Troubleshooting Internal Assemblies” when performing
assembly- level repair:
• To prepare for internal assembly troubleshooting.
• To check the system board power supply test points.
• To check the line filter board AC output.
• To check the power switch.
• To check the power supply DC output.
• To check the display supplies.
• To check the keyboard supplies.
• To check the fan.
Solving General Problems with the Oscilloscope
This section describes how to solve general problems that
you may encounter while using the Agilent 4000 X-Series
oscilloscopes.
After troubleshooting the oscilloscope, if you need to replace
parts, refer to Chapter 6, “Replaceable Parts,” starting on
page 135.
If there is no display
✔ Check that the power cord is firmly seated in the
oscilloscope power receptacle.
✔ Check that the power source is live.
✔ Check that the front- panel power switch is on.
✔ If there is still no display, go to the troubleshooting
procedures in this chapter.