228 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
Power Supply/Midplane Troubleshooting
A6 Power Supply Assembly Troubleshooting
A6 Power Supply Assembly Troubleshooting
The A6 Power Supply assembly is serviced as an assembly only; no component
level repair is supported.
If the instrument will not boot up properly, or the display is not turning on, refer
to the UXA Instrument Boot Up Process on page 47 before further A6 Power
Supply troubleshooting to rule out any other assembly as the cause of the
failure.
Supply Voltages
While there are no test points or status LEDs accessible for troubleshooting on
the A6 Power Supply assembly, there are both test points and status LEDs for
all of the different power supply voltages, as well as other power supply status
lines, on the A7 Midplane Board assembly. See the A7 Midplane Board
Assembly section in this chapter for detailed information on the location of
each.
Control Inputs
PS_ONn
PS_ONn is a signal that when pulled low tells the A6 Power Supply
assembly to turn on all of its outputs. This signal comes from the A4
Processor board assembly and is initiated by pressing the front panel
power button.
The A6 Power Supply has no user replaceable fuse. While there is a fuse internal to the supply
this is not meant for field replacement. If the internal fuse is blown, the power supply has
experienced a major failure and should be replaced.
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