72 6000 X-Series Oscilloscopes Service Guide
4 Troubleshooting
To check the line filter AC output
When the 13 V bulk power is not being properly supplied, this procedure tests the
AC input to the power supply to determine whether there is a problem with the line
filter.
1 Follow the instructions in “To prepare for internal assembly
troubleshooting" on page 69.
2 Connect the power cord, and turn on the oscilloscope.
3 Verify that AC power is present on LINE (brown wire) and NEUTRAL (blue wire)
at SK1 on the power supply using a DVM and probes as shown in the following
picture (remember this is an AC voltage measurement!).
• If you have AC power equal to what is being applied to J100 (power cord
socket) on the line filter, the AC mains portion of the line filter is probably
okay.
Figure 12 Verify line filter AC output
Verify AC potential between these two points
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