N9030B PXA Signal Analyzer Service Guide 301
Power Supply/Midplane Troubleshooting
A6 Power Supply Description
Power Supply Theory of Operation
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 PXA. 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 307 for detailed information on the location of
each
Supply Voltages
The following voltage levels are produced by the A6 Power Supply assembly:
Table 10-1
Supply Name Description Referenced To
+32VA +32 Volt Analog Supply ACOM
+15VA +15 Volt Analog Supply ACOM
+15VSB +15 Volt Standby Supply ACOM
+9VA +9 Volt Analog Supply ACOM
+5.1VA +5.1 Volt Analog Supply ACOM
-7VA -7 Volt Analog Supply ACOM
-15VA -15 Volt Analog Supply ACOM
+12VD +12 Volt Digital Supply DCOM
+5.1VD +5.1 Volt Digital Supply DCOM
+5.1VSB +5.1 Volt Standby Supply DCOM
+3.35VD +3.35 Volt Digital Supply DCOM
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