Instrument Self-Test - Keysight Technologies P Series Service Manual

4 Troubleshooting Guide

Instrument Self-Test

Instrument
Test point voltages
Calibrator
Fan
Battery
Peak path/ChA peak path
CW path/ChA CW path
DAP check/ChA DAP check
52
Purpose
Checks that all of the supply
voltages are present
Verifies that the calibrator is
working
(Note: This test does not check
that the calibrator meets its
specifications)
Verifies that the fan is working
Checks that the lithium
manganese battery on the
main board is working
Verifies that the peak path of
channel A is working
(Note: This does not prove that
the peak path meets its
specifications)
Verifies that the average path
of channel A is working
(Note: This does not prove that
the average path meets its
specifications)
Executes an internal self-test
procedure on the DAP
assembly for channel A
Debug tips
Replace the PSU to see if this
clears the faults
Check/reseat that cable
between the Calibrator
Assembly and the Main board
Attempt to adjust the 1 mW
Power Reference Level
Check/reseat the cable
between the Fan Assembly and
the Main board
Check visually to see whether
or not the Fan is working
Replace the battery to see if
this clears the fault
(Note: It is recommended for
the battery to be replaced at
the Keysight service center
every five years)
Replace the DAP Assembly for
Channel A to see if this clears
the fault
Not applicable
Replace the DAP assembly for
channel A to see if this clears
the fault
Keysight N1911A/1912A Service Guide
Possible faul ts
PSU (low probability)
Main board (high probability)
Calibrator assembly (high
probability)
Main board (low probability)
Fan assembly (high probability)
Main board (low probability)
Lithium manganese battery
(high probability)
Main board (low probability)
DAP assembly, channel A (low
probability)
Main board (low probability)
Main board
DAP assembly, channel A (high
probability)
Main board (low probability)