Assembly Removal and Replacement, MS202xC 6-25 Installing Main PCB and Reassembling Instrument
MS20xxC MM PN: 10580-00307 Rev. D 6-55
17. Fasten the VNA PCB Assembly into place using eight (8) Phillips-head screws. Torque these screws to
7.5 lbf·in (0.85 N·m).
Installing the Power Monitor PCB, Option 5:
18. If the Power Monitor PCB (Option 5) is not installed, then skip ahead to Step 19. If the Power Monitor
PCB is installed, then perform the following sub steps:
a. Insert the Detector connector with the Flex Cable into the Detector hole on the top connector
panel.
b. The Flex Cable must oriented above the Connector. Reinstall and tighten the two M3 x 0.5 Kep
Nuts using the 5.5mm angled-head open end wrench. Tighten firmly. These nuts have no torque
specification.
c. Carefully position the Power Module Assembly over its mounting standoffs.
d. Use extreme care so as to not bend any of the header pins.
e. Be careful to not offset the header pins by one row.
f. Make sure that the pins are loosely but correctly positioned before proceeding.
g. When perfectly aligned, press on each side of the header strip to mate the two connectors.
h. When the Power Monitor PCB is fully seated, inspect Header connectors from the side to Make
sure that all pins are correctly inserted and that no pins are bent.
i. Install the three (3) Phillips-head screws holding the Power Monitor PCB in place. Torque these
screws to 7.5 lbf·in (0.85 N·m).
j. Gently fold over the Flex Cable and insert it into the four-connector socket on the PCB.
Installing the Ext Trig BNC Connector and Dress Cables:
19. Reinstall the Ext Trig Input BNC connector in the top connector panel. Use the Tool T1451 socket to
tighten the BNC Connector Dress Nut. The torque specification is 7.5 lbf·in (0.85 N·m).
20. Make sure that all cables are clear of the case edges.
21. Install a cable tie over the two coax cables and the RF semi-rigid to keep them in place.
Replacing Case Rear Assembly:
22. Replace the Case Bottom Assembly, making sure that the top connector panel is correctly centered in its
mounting groove in the case back and that all cables are clear. Insert and tighten the four case mounting
screws. Torque these screws to 7.5 lbf·in (0.85 N·m).
Installing Main and Main Menu Keypads:
If the Main Keypad was removed, then perform the following steps.
23. Install the Main Keypad PCB and the Main Menu Keypad Flex PCB into the front cover.
24. Carefully position the Main Keypad and insert the long header pin into the provided slot.
25. Gently press the Main Keypad into place so that the header pins mate with the connector on the Main
PCB.
26. Fit the Main Keypad Bezel over the Main Keypad so that it is under the Speaker. Make sure that the
Speaker is correctly positioned to fit into the pins.
Caution
All cables along the lower edge of the Mother Board and VNA PCB Assembly must be routed in such
a manner that they will not be pinched between, or protrude between, the case halves of the upper
battery compartment. If any cable protrudes into the battery compartment when the case is closed,
then the cable may be damaged by pinching, or by the battery when it is inserted, or it may prevent
battery insertion.
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