6-26 Replacing Fan Assembly – ND70948 Assembly Removal and Replacement, MS202xC
6-62 PN: 10580-00307 Rev. D MS20xxC MM
Installing the GPS Antenna SMA Connector:
If the GPS Receiver Module PCB (Option 31) is not installed, then skip ahead to Step 14. If the GPS Receiver
Module PCB is installed, then perform the following sub steps:
a. Route the GPS Antenna Cable (with its SMA connector from the Main PCB) through the notch
between the top connector panel and the PCB, and into its position in the top connector panel.
b. Install the lock washer and then the nut.
c. Use two 5/16 inch (~8 mm) wrenches to attach the GPS Antenna SMA connector to the top
connector panel. Torque the nut to 7.5 lbf·in (0.85 N·m).
14. Carefully position the VNA PCB Assembly over the Main PCB and the eight (8) hex standoffs.
15. Fasten the VNA PCB Assembly into place using eight (8) Phillips-head screws. Torque these screws to
7.5lbf·in (0.85N·m).
Installing the Power Monitor PCB Assembly and Detector Connector:
16. If the Power Monitor PCB (Option 5) is not installed, then skip ahead to Step 17. 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 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:
17. 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).
18. Make sure that all cables are clear of the case edges.
19. Install a cable tie over the two coax cables and the RF semi-rigid to keep them in place.
Closing the Case:
20. Close the case as described in section “Closing the Case” on page 6-26.
Installing Battery:
Refer to Section 5-4 “Battery Pack Removal and Replacement” on page 5-3.
21. Install the Battery.
22. Install the Battery Door.
Restarting the Instrument:
23. Restart the instrument.
24. Perform a function check to verify all repairs and part replacements.
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