8) Test the down programming circuits: With no load attached to the power supply, monitor
the output voltage with an external voltmeter. Program the output voltage for the model’s
highest rated voltage. Switch the output off. If the down programmer circuit is operational,
the output voltage will drop to zero in a fraction of a second. If the down programmer cir-
cuit is not operational, the filter capacitors will take tens of seconds to discharge.
Service Note 6684A-03 Page 3
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