Specifications

8
Is the fan running?
If yes, go to "To run the internal self-tests," on page 4–46. If not, do the steps
below.
The Low Voltage Power Supply has a thermal cut-out circuit. If the fan is
defective, the Low Voltage Power Supply shuts down when it gets too hot for
safe operation.
a
Disconnect the fan cable from the power supply.
b
Measure the fan voltage at the connector on the power supply.
If the fan voltage is –8.3 Vdc, replace the fan. If not, replace the
power supply.
Service
Troubleshooting the Oscilloscope
4–44