7-21 Removing MS203xC Main PCB Assembly Assembly Removal and Replacement, MS203xC
7-58 PN: 10580-00307 Rev. D MS20xxC MM
Removing the VNA PCB Assembly:
5. Using a Phillips-head screwdriver, remove the eight (8) screws holding the VNA PCB Assembly in place.
6. Two cables connect between the VNA PCB Assembly and the Mother Board. Refer to Figure 7-21 for
Mother Board connector locations.
a. The External Trigger In cable is attached to the Ext Trig In connector on the top connector panel
and also to connector J3202 on the Mother Board.
b. The 26 MHz VNA reference cable is attached to the top shield of the VNA Module and also to
connector J2201 on the Mother Board.
7. Two cables connect between the VNA PCB Assembly and the SPA PCB. These cables were disconnected
from the SPA PCB while you were performing the steps in Section 7-16 “Opening the Instrument Case”
on page 7-26. Leave the cables attached to the VNA PCB Assembly. They will be reattached to the SPA
PCB later. Their locations are:
a. The External Reference In cable attaches to the Ext Ref In connector on the top connector panel
and also to connector J6000 on the SPA PCB.
b. The 10 MHz Reference Out cable attaches to the Ref Out 10 MHz connector on the top connector
panel and also to connector J6001 on the SPA PCB.
8. Lift the top edge of the VNA Assembly (with the attached connector panel) and carefully move the VNA
Assembly up and in the direction of the top of the case in order to expose the MCX cable connection on
the Mother Board at J2201 and the MMCX cable connection on the Mother Board at J3202.
Figure 7-27. Main PCB (Mother Board) in Case – Standoffs and Screws
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