Troubleshooting Guide 5
Keysight N1913/1914A Service Guide 75
Instrument Self-Test
Instrument Purpose Debug tips Possible faults
Test point voltages Checks that all of the supply voltages
are present
Replace the PSU to see if this clears
the faults
PSU (low probability)
Main board (high
probability)
Calibrator Verifies that the calibrator is working
(Note: This test does not check that
the calibrator meets its
specifications)
Check/reseat that cable between the
calibrator assembly and the main
board
Attempt to adjust the 1 mW power
reference level
Calibrator assembly
(high probability)
Main board (low
probability)
Fan Verifies that the fan is working Check/reseat the cable between the
fan assembly and the main board
Check visually if the fan is functioning
Fan assembly (high
probability)
Main board (low
probability)
RTC battery Checks that the lithium manganese
battery on the main board is working
Replace the battery to see if this
clears the fault
Lithium manganese
battery (high
probability)
Main board (low
probability)
CW path/ChA CW path Verifies that the average path of
channel A is working
(Note: This does not prove that the
average path meets its
specifications)
Not applicable Main board
ChB CW path Verifies that the average path of
channel B is working
(Note: This does not prove that the
average path meets its
specifications)
Not applicable Main board
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