Assembly Removal and Replacement, MS202xC 6-20 Replacing Rotary Encoder – 3-410-101
MS20xxC MM PN: 10580-00307 Rev. D 6-41
6-20 Replacing Rotary Encoder – 3-410-101
Replacing the Rotary Encoder involves removing the Rotary Knob, and then opening the case and partially
removing the VNA PCB Assembly. If the Power Monitor PCB (Option 5) is installed, then this PCB must be
removed. If the GPS Receiver Module (Option 5) is installed, then the GPS Antenna must be disconnected.
After the VNA PCB Assembly is “folded” out of the way, the Rotary Encoder mounting hardware can be
loosened from the Front Panel, and its cable can be detached from the Main PCB Assembly. The Main PCB
Assembly need not be removed to replace the Rotary Encoder.
Part Numbers
• 3-410-101 – Rotary Encoder
• For MS2026C, MS2027C or MS2028C instruments
• Includes the connection cable to the Main PCB Assembly, connector J5010.
• Does not include the Rotary Knob – 3-61360-2
Procedure
Removing the Rotary Knob:
1. Use a flat-blade screwdriver and piece of rubber (as a fulcrum) to remove the Rotary Knob.
2. Use a 7/16 inch (≅ 12 mm) nut driver to remove the nut, lock washer, and flat washer that hold the
Encoder in place.
3. Open the case as described in Section 6-16 “Opening the Instrument Case” on page 6-24.
Removing Power Monitor PCB (Option 5):
4. If the Power Monitor PCB (Option 5) is NOT installed, then skip ahead to Step 5. If the Power Monitor
PCB is installed, then perform the following sub steps:
a. Refer to Figure 6-13 on page 6-27 for Power Monitor PCB connectors and orientation. Pry out the
flex cable attached to the Detector connector from the Power Monitor PCB.
b. Remove the three Phillips-head screws from the Power Monitor PCB.
c. Using the Tool T1451 socket, remove the BNC Connector Dress Nut from the Ext Trig Input
connector. Leave the Ext Trig Input connector and its attached coaxial cable loosely in place in the
top connector panel.
d. Holding the Connector Flex Cable away from the Power Monitor PCB, gently lever up the PCB out
of its header socket.
e. If the Header Pins stay on the VNA PCB Assembly, then remove the pins and reinstall them on
the Power Monitor PCB.
f. Set the Power Monitor PCB assembly with header pins aside.
g. Removing the Power Monitor PCB provides access to the Ext Trig Input BNC connector and a
VNA PCB Assembly mounting screw.
Removing the Ext Trig Input BNC Connector:
5. Cut the cable tie (if used) that holds the Ext Trig Input and Ext Ref Input coaxial cable to the RF Out
semi-rigid.
6. Using the Anritsu Tool T1451, the castellated socket, remove the BNC Connector Dress Nut from the
Ext Trig Input connector. Pull the Ext Trig Input connector from the top connector panel and position it
out of the way.
Removing the Ext Trig Input connector provides access to a VNA PCB Assembly mounting screw.
Removing the VNA PCB Assembly:
7. Using a Phillips-head screwdriver, remove the eight (8) screws holding the VNA PCB Assembly in place.
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