Agilent Technologies N5230A, Service Manual, Page: 101 / 262

Service Guide N5230-90014 4-31
PNA Series Microwave Network Analyzers Troubleshooting
N5230A Measurement System Troubleshooting
Checking the Source Group
Serial Bus Test
Before performing tests on specific assemblies in the source group, it is recommended that
you perform the serial bus test. This may help to isolate the failure to a specific assembly.
Through the front panel, the serial bus test allows you to check signal and voltage levels at
32 points (nodes) distributed across four of the printed circuit board assemblies in the
analyzer. With this test you can isolate problem board assemblies in the analyzer. The
board assemblies tested and their associated node numbers are as follows:
NOTE This test is written for a PNA series network analyzer as it was originally
shipped from the factory. Due to changes in board production, this test may
not show accurate pass/fail results if the A6, A7, A8, A9, A10, or A16 board
have been replaced with newer board assemblies.
Descriptions of each board assembly and node is included in this section. Location of the
nodes is indicated with a
♦
symbol on the block diagrams located at the end of this chapter.
Performing the Serial Bus Test
First, this test sequentially checks all 48 nodes at 45 MHz. Next, the test checks all nodes
that change values with frequency, at 49 different frequency points. For each node,
measured values are copied to an ASCII text file in the service directory on the hard disk
drive. Any measured values that exceed the tolerances are highlighted in the application
and the data file.
To run the serial bus test:
• On the
System
menu, point to
Service,
and then click
Serial Bus Test
.
• The dialog box in Figure 4-10 on page 4-32 is displayed. Click
Begin
to start the test.
Board Assembly Node Numbers
A6 multiplier 1211 to 1218
A8 multiplier 1111 to 1118
A10 frequency reference 211 to 218
A7 fractional-N synthesizer 411 to 418
A16 test set motherboard, MA 511 to 518
A16 test set motherboard, SSLAM 611 to 618
A16 test set motherboard, AUX 1 711 to 718
A16 test set motherboard, AUX 2 811 to 818
A9 fractional-N synthesizer 911 to 918