Disassembly and Repair 6
Keysight 33210A Service Guide 113
Operating Checklist
Before returning your instrument to Keysight Technologies for service or repair,
check the following items:
Is the instrument inoperative?
– Verify that the ac power cord is connected to the instrument.
– Verify that the front-panel On/Standby switch has been pushed.
Is the display working?
– If the display appears blank, but front-panel keys are lit (and the fan is
working), the display screen saver may be enabled. Press any key to restore the
display.
– If the display appears blank, but front-panel keys are lit (and the fan is
working), the display contrast setting may be too low. Use the menu to
set the display contrast.
Does the instrument fail self-test?
Remove all external connections to the instrument. Errors may be induced by
signals present on the external wiring during a self-test. Long test leads, even
leads that are otherwise unconnected, can act as an antenna causing pick-up of
ac signals.
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