6-10 Ethernet PCB Assembly (Option 411) Replacement Removal and Replacement
6-26 PN: 10580-00303 Rev. D Model MS20xxB MM
6-10 Ethernet PCB Assembly (Option 411) Replacement
This procedure provides instructions for removing and replacing the Ethernet PCB Assembly. This option
includes an option plate (with an opening for the Ethernet connector) that is attached to the top connector
panel with 4 nuts.
Parts:
• ND72101 – Ethernet Option PCB Assembly, Option 411
Procedure:
1. Open the case as described in Section 6-6 “Opening the Instrument Case” on page 6-14.
2. Remove the PCB Assembly from the front case as described in Section 6-7 “PCB Assembly Replacement
(MS202xB and MS203xB)” on page 6-17.
3. If the instrument is an MS2034B or MS2035B, then partially remove the SPA board as described in
Table 6-8, “SPA Assembly Replacement” on page 6-19.
a. Use the Anritsu Tool T1451 to remove the castellated BNC dress nuts from the External Reference
connector and the External Trigger connector (shown in Figure 6-15 on page 6-19 and Figure 6-16
on page 6-20). Save the washers.
b. Use a Phillips-head screwdriver to remove the 6 screws (refer to Figure 6-15) retaining the SPA
board. Two of these screws secure the SPA PCB to the top connector panel. The other four screws
connect the SPA PCB to the brackets at the sides of the Mother Board. (Refer also to Figure 6-14
on page 6-17.)
c. Slide the SPA board out of the top connector panel, and carefully lay it to the side without applying
stress to the cables.
4. Refer to Figure 6-19 for removing the 4 screws retaining the Ethernet PCB Assembly to the Main/VNA
board. The Ethernet PCB Assembly has 3 screws on one side (attaching directly to the Mother Board)
and 1 screw on the opposite side (item 1 in Figure 6-19, which attaches to the VNA shield).
5. Use a Phillips screwdriver to remove the 2 screws that hold the top connector panel to the main PCB
Assembly.
a. One screw is adjacent to the single screw for the Ethernet PCB (item 1 in Figure 6-19) and holds a
bracket of the top connector panel to the shield on the VNA PCB.
b. The other screw attaches the Mother Board to the top connector panel and is adjacent to the top
Ethernet PCB screw into the Mother Board, near the Ethernet connector.
c. Slide the top connector panel free of the PCB assembly and free of the connectors.
6. Carefully remove the Ethernet PCB Assembly.
Installing the Ethernet PCB Assembly:
7. Installation is the reverse of removal. Follow replacement instructions for each of the parts and
assemblies that were removed, as appropriate.
8. Close the case as described in Section
“Case Reassembly:” on page 6-16.
Note
In the MS2024B or MS2025B, no SPA PCB blocks access to the GPS Module.
In the MS2034B or MS2035B, the SPA board RF cables that connect to the DSP board do not need
to be removed when replacing the Ethernet PCB Assembly.
Caution
Before attempting to remove the Ethernet PCB Assembly, you must remove the top connector panel.
The Ethernet PCB Assembly must be removed carefully in order to protect vulnerable parts that can
be easily damaged.
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