Agilent Technologies N5230A Service Manual page 79

PNA Series Microwave Network Analyzers
N5230A
Table 4-1 Extender Board Measurement Points
Measurement
Location Description
A +5V power supply
B -15V power supply
C -5V power supply
D +9V power supply
E +15V power supply
F +15V power supply
G +22V power supply
H +32V power supply
a. DMM = Digital multi-meter
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
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
3. Remove the A5 SPAM board (refer to
Boards" on page 7-16).
4. Remove the A6 multiplier board (refer to
Boards" on page 7-16).
Service Guide N5230-90014
Signal
Test Equipment Used
"Rear Panel Troubleshooting" on page
"Removing and Replacing the A5 through A10
Expected
a Level (Vdc)
DMM +5.0
DMM -15.0
DMM
DMM +9.0
DMM +15.0
DMM +15.0
DMM +22.0
DMM +32.0
7-10).
"Removing and Replacing the A5 through A10
Troubleshooting
Power Up Troubleshooting
Approximate
Resistance (Ω)
285
12.7 k
-5.0 7.2 k
4.0 k
3.0 k
2.8 k
890
2.6 k
4-20.
4-9