Technical data

86 4000 X-Series Oscilloscopes Service Guide
4 Troubleshooting
Flowchart for Internal Assembly Power Troubleshooting
The following flowchart is a simplified overview of
troubleshooting power to the oscilloscope’s internal
assemblies.
Start
13V
Supply Voltage
Okay?
Yes
No
Power
Supply AC Input
Okay?
No
Yes
Display/
Keybd Supplies
Okay?
Yes
End
Fan Voltage
Okay?
No
Yes
Replace Line
Filter Board
Replace Fan or
Line Filter Board
Replace Keyboard
or Display
Replace
System Board
System
Board Voltages
Okay?
No
Yes
Power Switch
Okay?
Replace
Power Supply
No
Replace Line
Filter Board
Yes
No