Troubleshooting 4
6000 X-Series Oscilloscopes Service Guide 73
• If there is no AC power at SK1 of the power supply, there is something wrong
with the power switch or AC mains section of the line filter, and you need to
replace the power board.
• If there is AC power at SK1 of the power supply, but the instrument still will
not power ON when the power switch (S100) is in the ON position, go to “To
check the power supply DC output" on page 73.
To check the power supply DC output
This procedure checks the power supply DC output after verifying the AC input is
good.
1 Follow the instructions in “To prepare for internal assembly
troubleshooting" on page 69.
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 Verify there is +13V on power board between power board connector J102 pins
3, 4, or 5 (GND, black wires) and pins 8, 9, or 10 (+13V, red wires).
If +13V is not present:
a Turn off the oscilloscope.
b Disconnect the power cord.
c Verify the continuity of the wires on the cable from the power supply to
connector J102.
• If the cable is good, replace the power supply.
• If the cable is bad, replace the cable.
If the voltage measured is out-of-range, replace the power supply.
If +13V is present, the power supply is good.
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