Keysight NFA Series Noise Figure Analyzers Service Guide
305
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 signal analyzer. 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
for detailed information on the location of each
Supply Voltages
The following voltage levels are produced by the A6 Power Supply assembly:
Voltage
Level
Ground
Reference
A7 Midplane
Connector
Voltage
Level
Ground
Reference
A7 Midplane
Connector
+15V SB
ACOM
J101
+12V D
DCOM
J111
+5.1V SB
DCOM
J111/J112
+5.1V D
DCOM
J109/J110
+32V A
ACOM
J101
+3.35V D
DCOM
J107/J108
+15V A
ACOM
J103/J104
-15V A
ACOM
J105
+9V A
ACOM
J104
-7V A
ACOM
J105
+5.2V A
ACOM
J102
FAN POS
FAN NEG
J101
FAN NEG
FAN POS
J101
Содержание N8973B
Страница 4: ...4 ...
Страница 44: ...44 Keysight NFA Series Noise Figure Analyzers Service Guide Overview How to Return Your Instrument for Service ...
Страница 132: ...132 Keysight NFA Series Noise Figure Analyzers Service Guide Instrument Messages Condition Messages ...
Страница 228: ...228 Keysight NFA Series Noise Figure Analyzers Service Guide RF Section Troubleshooting N8976B Troubleshooting ...
Страница 268: ...268 Keysight NFA Series Noise Figure Analyzers Service Guide Analog Digital IF Troubleshooting 25 MHz BW IF Section ...
Страница 322: ...322 Keysight NFA Series Noise Figure Analyzers Service Guide Block Diagrams Block Diagrams Block Diagrams ...
Страница 332: ...332 Keysight NFA Series Noise Figure Analyzers Service Guide Block Diagrams Block Diagrams NFA Computer Block Diagram ...
Страница 350: ...350 Keysight NFA Series Noise Figure Analyzers Service Guide Service and Diagnostics Menus Front Panel Key Test ...
Страница 470: ...470 Keysight NFA Series Noise Figure Analyzers Service Guide Assembly Replacement Procedures Front Frame Assembly ...