Agilent Technologies N5230A, Service Manual, Page: 79 / 262

Service Guide N5230-90014 4-9
PNA Series Microwave Network Analyzers Troubleshooting
N5230A Power Up Troubleshooting
If All Supply Voltages are Present
If all of the supplies have measured within tolerances, and the instrument still is not
functioning properly, refer to
“Rear Panel Troubleshooting” on page 4-20 .
If All Supply Voltages Are Missing
WARNING Disconnect the line-power cord before removing any assembly.
Procedures described in this document may be performed with
power supplied to the product while protective covers are removed.
Energy available at many points may, if contacted, result in personal
injury or loss of life.
You must sequentially remove all of the assemblies, taking care to disconnect the line
power cord before each removal, and then measure the supply voltages after each removal.
If the missing supply voltages return to a “power on” condition after removal of an
assembly, suspect that assembly as being defective.
Remove the network analyzer assemblies in the order specified in the following steps (refer
to
Chapter 7 for removal instructions).
1. Unplug the test set motherboard cable from the A16 test set motherboard (refer to
“Removing and Replacing the A16 Test Set Motherboard and the USB Hub” on
page 7-22
).
2. Unplug the front panel interface cable from the A3 front panel interface board (refer to
“Removing the A3 Front Panel Interface Board” on page 7-10 ).
3. Remove the A5 SPAM board (refer to “Removing and Replacing the A5 through A10
Boards” on page 7-16 ).
4. Remove the A6 multiplier board (refer to “Removing and Replacing the A5 through A10
Boards” on page 7-16 ).
Table 4-1 Extender Board Measurement Points
Measurement
Location
Signal
Description
Test Equipment Used
a
Expected
Level (Vdc)
Approximate
Resistance (
Ω
)
A +5V power supply DMM +5.0 285
B -15V power supply DMM -15.0 12.7 k
C -5V power supply DMM -5.0 7.2 k
D +9V power supply DMM +9.0 4.0 k
E +15V power supply DMM +15.0 3.0 k
F +15V power supply DMM +15.0 2.8 k
G +22V power supply DMM +22.0 890
H +32V power supply DMM +32.0 2.6 k
a. DMM = Digital multi-meter