368 Keysight N9038A MXE Service Guide
Power Supply & Midplane
A6 Power Supply Description
A6 Power Supply Description
A6 Power Supply Purpose
The A6 Power Supply assembly provides most all the necessary DC voltages
for the entire instrument to operate correctly. If any of the power supplies are
not within their operating voltages, the instrument will not function properly.
The power supply outputs provide power to all the printed circuit boards,
microcircuit assemblies, front panel display and fans, any of which can cause
an over current condition if not operating correctly. The power supply will
remain on in an over current state for a minimum of 1 second. The power
supply will turn off no later than 5 seconds after the beginning of the over
current state. Any one output over current condition will latch the supply off
until the line voltage is removed from the rear panel AC power input connector
and then reconnected. The power supply assembly plugs into the A7 Midplane
Assembly from the rear of the instrument.
A6 Power Supply Description
The A6 Power Supply assembly is serviced as an assembly only; no component
level repair is supported.
The A6 Power Supply assembly provides most all of the necessary DC voltages
for the instrument. If any of the power supplies are not within their operating
voltages, the instrument will not function properly.
The A6 Power Supply assembly is a switching supply that operates at a
frequency of ~130 kHz.
The A6 Power Supply assembly is an auto ranging supply, requiring no user
selection of the input voltage. The input AC voltage and frequency
requirements for the A6 Power Supply assembly are printed on the rear panel
of the instruments as well as on the power supply itself.
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 Description” on page 373 for detailed information on the location of
each.
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