4-10 Service Guide N5230-90024
Troubleshooting PNA Series Microwave Network Analyzers
Power Up Troubleshooting N5230C
Boards and the Plenum Bracket” on page 7-16).
6. Remove the A8 multiplier board (refer to “Removing and Replacing the A5 through A10 Boards and the
Plenum Bracket” on page 7-16).
7. Remove the A9 fractional-N synthesizer board (refer to “Removing and Replacing the A5 through A10
Boards and the Plenum Bracket” on page 7-16)
8. Remove the A10 frequency reference board (refer to “Removing and Replacing the A5 through A10
Boards and the Plenum Bracket” on page 7-16).
9. Unplug the A41 hard disk drive from the A15 CPU board (refer to “Removing and Replacing the A41 Hard
Disk Drive (HDD)” on page 7-40).
The minimum required assemblies to power up the analyzer are:
• A4 power supply
• A14 system motherboard
•A15 CPU board
To further isolate the failure in the three remaining assemblies, measure the resistance on the extender
board (with the power turned off) from the power supply test points to “GND”. Refer to Figure 4-2 on
page 4-8 for the location of the measurement points. The resistances should be as shown in Table 4-1 on
page 4-9.
NOTE Make sure that the only assemblies plugged in are the three minimum required assemblies
listed above.
Check for shorts (zero ) or very low resistance (approximately 1 ). If a short or low resistance is
measured, isolate each of the remaining three boards in the following order, and recheck the shorted test
point after each board is removed. Note that the resistance may be different from that listed in the table, but
you should be able to determine if the shorted condition has changed.
Isolate the remaining three assemblies:
• remove the A15 CPU board
• remove the A4 power supply
• This leaves only the A14 system motherboard installed. If the measurements are still incorrect, this is
the suspected faulty assembly.
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