Technical data

Troubleshooting 4
4000 X-Series Oscilloscopes Service Guide 89
To check the system board power supply test points
This procedure checks the power supply test points on the
system board (see See Figure 16 on page 88). Values outside
the expected range help identify bad assemblies.
1 Follow the instructions in “To prepare for internal
assembly troubleshooting” on page 83.
2 Connect the negative lead of the multimeter to a ground
point on the oscilloscope.
3 Connect the power cord, and turn on the oscilloscope.
4 First check the bulk power supply voltage:
Test Point
(near J3700)
Expected Value Assemblies
Supplied
If Good If Bad
VP13V (+13V) +13 V ±3% All Indicates power supply is good. Go to “To check the line filter
board AC output” on page 91.