Removal and Replacement 6-8 SPA Assembly Replacement
Model MS20xxB MM PN: 10580-00303 Rev. D 6-21
3. 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 and Figure 6-16). Save the washers.
4. Remove the Main/VNA board ribbon connector from the SPA PCB.
5. Use needle-nose pliers to remove the RF cables from the 2 MMCX connectors (SPA board to DSP board).
6. 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.)
7. Slide the SPA board out of the top connector panel.
Installing the SPA PCB Assembly:
8. Installation is the reverse of removal. Follow replacement instructions for each of the parts and
assemblies that were removed, as appropriate.
9. Slide the replacement SPA board into the top connector panel and onto the brackets at the sides of the
Mother Board.
10. Use a Phillips-head screwdriver to secure the 6 screws (refer to Figure 6-15) retaining the SPA board to
the top connector panel and to the Mother Board. Torque these six screws to 7.5 lbf·in (0.85 N·m).
11. Use the Anritsu Tool T1451 to attach the castellated BNC dress nuts to the External Reference connector
and the External Trigger connector (shown in Figure 6-15 and Figure 6-16). Use the washers that were
saved in Step 3, and torque the nuts to 7.5 lbf·in (0.85 N·m).
12. Connect the ribbon cable (Item 5 in Figure 6-17) from the Mother Board to the SPA PCB.
13. Connect the RF cables from the DSP board to the SPA board. Refer to Figure 6-17 for the locations of the
MMCX connectors.
The RF cable from MMCX connector DSP J1 (100 MHZ, Item 4 in Figure 6-17) connects to SPA PCB J61
(Item 9 in Figure 6-17).
The RF cable from MMCX connector DSP J2 (140 MHZ SPA IF, Item 3 in Figure 6-17) connects to
SPA PCB J4 (Item 6 in Figure 6-17).
14. Connect the battery cable to the Mother board and close the case, as described in Section “Case
Reassembly:” on page 6-16.
Table 6-1. Numbered Items in Figure 6-16
1 SPA PCB Assembly
2 2 Screws attaching SPA PCB to Top Connector Panel
3 Connector Panel
4 Hole Plug, if Option 31 (GPS) is not installed
5 Castellated BNC dress nuts
6 SPA PCB Connector for ribbon cable to Mother Board
7 Fan connector on Mother Board
8 LCD connector on Mother Board
9 DSP PCB
10 Battery connector on Mother Board
11 Mother Board
12 Mother Board connector J1 for ribbon cable to SPA PCB
13 VNA shield (attached to Mother Board)
14 Castellated BNC dress nuts
15 GPS Antenna SMA connector
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