A6 Power Supply Description; Supply Voltages - Agilent Technologies N9039A Service Manual

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 N9039A RF Preselector. 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 ~120 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
Chapter 2, "Troubleshooting"

Supply Voltages

The following voltage levels are produced by the A6 Power Supply assembly:
Voltage Ground
Level Reference
+15V STBY ACOM
+5.1V STBY DCOM
+32V A ACOM
+15V A ACOM
+9V A ACOM
+5.2V A ACOM
Chapter 3
"A7 Midplane Board Assembly"
for detailed information on the location of each.
A7 Midplane Voltage
Connector Level
J101 +12V D
J111 / J112 +5.1V D
J101 +3.35V D
J103 / J104 -15V A
J104 -7V A
J102 FAN POS
FAN NEG
Assembly Descriptions

A6 Power Supply Description

section in
Ground A7 Midplane
Reference Connector
DCOM J111
DCOM J109 / J110
DCOM J107 / J108
ACOM J105
ACOM J105
FAN NEG J101
FAN POS J101
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