Assembly Removal and Replacement, MS203xC 7-17 Replacing SPA Module Assembly
MS20xxC MM PN: 10580-00307 Rev. D 7-35
Installing the Replacement SPA PCB:
9. Position the replacement SPA PCB in the Case Bottom Assembly. Refer to Figure 7-16 for general
orientation. Using a Phillips-head screwdriver, tighten the six (6) screws that hold the SPA PCB in
place. Torque the screws to 7.5 lbf·in (0.85 N·m).
10. Route the cables from the VNA Assembly top connector panel, the Ext Ref Input BNC connector and the
Ref Out 10 MHz SMA connector, through the cable clip (item 13 in Figure 7-16).
11. Route the cables from the Mother Board (the 100 MHz cable from MB J2200 and the 140 MHz IF cable
from MB J3203) through the cable clip along with the cables from the VNA Assembly top connector
panel.
12. Close the cable clip around these 4 cables. It latches closed.
13. Using Figure 7-15 and Figure 7-16 to identify the cable connections, attach the 4 cables to the MMCX
connectors on the SPA PCB:
a. Connect the 10 MHz Ref Out cable (SMA connector on VNA Assembly top connector panel) to
SPA PCB J6001, which is directly adjacent to the ribbon cable connector, SPA PCB J5001.
b. Attach the Ext Ref cable (BNC connector on VNA Assembly top connector panel) to
SPA PCB J6000.
c. Attach the Mother Board 100 MHz cable from MB J2200 to SPA PCB J6002.
d. Attach the Mother Board 140 MHz_IF cable from MB J3203 to SPA PCB J4004.
14. Attach the ribbon cable from Mother Board J3000 to connector SPA PCB J5001, and then close the cable
clamp, item 11 in Figure 7-16 (it snaps into place when locked closed).
15. The next step is to close the case. Verify that all cables are properly positioned.
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