6-20 Replacing Rotary Encoder – 3-410-101 Assembly Removal and Replacement, MS202xC
6-42 PN: 10580-00307 Rev. D MS20xxC MM
8. Gently lift the VNA PCB Assembly without disconnecting any cables and without applying excessive
stress to the cables. Carefully fold back the VNA PCB Assembly as if opening a book, and lay it
edge to edge with the Main PCB Assembly (Mother Board).
Removing the GPS Receiver Module (Option 5):
9. If the GPS Receiver Module PCB (Option 31) is not installed, then skip ahead to Step 10. If it is installed,
then perform the following sub steps:
a. Use needle-nose pliers to remove the MCX RF coaxial connector from the GPS Receiver Module.
b. Leave the GPS Antenna SMA connector attached to the top connector panel.
Removing the Rotary Encoder:
10. On the inside of the case, disconnect the Rotary Encoder cable from the Main PCB Assembly.
11. Remove the old Rotary Encoder and its attached cable from the case and set it aside.
Installing Replacement Rotary Encoder:
12. Position the replacement Rotary Encoder in the case with the cable connector towards the center of the
Case.
13. Attach the Rotary Encoder cable to the Main PCB Assembly connector J5010. The cable connector goes
into the PCB connector on the side away from the Encoder with the connector ridges up. Coil up excess
cable on top of the encoder PCB.
14. From the front panel, add–in sequence–the flat washer, lock washer, and nut. Tighten the nut to hold in
place by using the 7/16 inch (≅ 12 mm) nut driver. Torque the nut to 8 lbf·in (0.9 N·m).
15. From the front panel, press on the Rotary Knob.
Installing GPS Receiver Module (Option 5):
16. If the GPS Receiver Monitor PCB (Option 31) is not installed, then skip ahead to Step 17. If it is installed,
then perform the following sub steps:
a. Route the GPS Antenna Cable MCX connector into place to the GPS Receiver Module.
b. Use needle-nose pliers to attach the MCX connector to the GPS Receiver Module.
Installing the VNA PCB Assembly:
17. “Fold” the VNA PCB Assembly back into position over the Main PCB and the eight (8) hex standoffs,
positioning it as accurately as possible over the Main PCB Assembly, observing the following:
• The fan and other cables on the side of the Case are clear of the hex standoffs and the Case edge.
• The GPS Antenna Cable is correctly routed between the top connector panel and the PCB and is
located in its notch.
• The coaxial cables between the two PCBs are on the OUTSIDE of the hex standoffs and also clear
of the Case edge.
• Carefully align these cables parallel with the edge of the PCB.
18. Make sure that the VNA PCB Assembly is correctly positioned over the standoffs on the Mother Board,
and then fasten it into place using eight (8) Phillips-head screws.
Torque these screws to 7.5 lbf·in (0.85 N·m).
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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