Assembly Removal and Replacement, MS202xC 6-20 Replacing Rotary Encoder – 3-410-101
MS20xxC MM PN: 10580-00307 Rev. D 6-43
Installing Power Monitor PCB (Option 5):
19. If the Power Monitor PCB (Option 5) is not installed, then skip ahead to Step 20. If it 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 be oriented above the Connector. Reinstall and tighten the two M3 x 0.5
Kep Nuts using the 5.5 mm angled-head open end wrench or a nut driver. These nuts have no
torque specification. Tighten firmly.
c. Carefully position the Power Monitor Assembly over its mounting standoffs.
d. Use extreme care so as to not bend any of the header pins.
Be careful to not offset the header pins by one row.
Make sure that the pins are loosely but correctly positioned before proceeding.
e. When perfectly aligned, press on each side of the header strip to mate the two connectors.
f. When the Power Monitor PCB is fully seated, inspect the header connectors from the side to make
sure that all pins are correctly inserted and that no pins are bent.
g. 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).
h. Gently fold over the Flex Cable and insert it into the four-connector socket on the PCB. Refer to
Figure 6-13 on page 6-27 for Power Monitor PCB and Connector orientation. Refer to Figure 6-16
on page 6-34 for coaxial cable connections between the VNA PCB Assembly and the Main PCB
Assembly.
Installing the Ext Trig Input BNC:
20. Install the External Trigger Input BNC connector and coaxial cable into the top connector panel.
21. Route the coaxial cable UNDER the RF semi-rigid and use the Tool T1451 socket to tighten the BNC
Connector Dress Nut to a torque of 7.5 lbf·in (0.85 N·m).
22. Make sure that all cables are clear of the case edges.
23. Install a cable tie over the two coaxial cables and the RF semi-rigid to keep them in place.
Installing the Case Bottom Assembly and Battery:
24. 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 Battery:
Refer to Section 5-4 “Battery Pack Removal and Replacement” on page 5-3.
25. Install the Battery.
26. Install the Battery Door.
Restarting the Instrument:
27. Restart the instrument.
28. Perform a function check to verify all repairs and part replacements.
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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