6-21 Removing MS202xC Main PCB Assembly Assembly Removal and Replacement, MS202xC
6-44 PN: 10580-00307 Rev. D MS20xxC MM
6-21 Removing MS202xC Main PCB Assembly
This procedure covers removing the Main PCB Assembly (Mother Board) from the MS2026C, MS2027C and
MS2028C instruments by removing the Power Monitor PCB Assembly (if installed), the VNA PCB Assembly,
the GPS Receiver Module (if installed), and then the Main PCB Assembly. After the Main PCB Assembly is
removed, separate replacement procedures are available:
• Section 6-22 “Replacing MS202xC Main PCB Assembly” on page 6-47
• Section 6-23 “Replacing LCD Display – 3-15-154” on page 6-50
• Section 6-24 “Replacing Clear Plastic LCD Protector – 3-61368” on page 6-51
After the required replacement units are installed, the final procedure describes how to reinstall the Main PCB
Assembly, GPS Receiver Module, VNA PCB Assembly, Power Monitor PCB, and then close the case:
• Section 6-25 “Installing Main PCB and Reassembling Instrument” on page 6-52
Procedure
1. Place the instrument face up on a protected work surface oriented with the Connector Strip away from
you.
2. Remove the Battery Door and the Battery.
3. Carefully turn the instrument face down.
4. Open the case by removing the four (4) fastening screws. Lift up the Case Rear Assembly and set it aside.
Removing Power Monitor PCB (Option 5):
5. If the Power Monitor PCB (Option 5) is NOT installed, then skip ahead to Step 6. 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 that is 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.
Removing the Ext Trig Input connector provides access to one of the VNA PCB Assembly
mounting screws.
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 aside the Power Monitor PCB assembly with header pins.
g. Removing the Power Monitor PCB provides access to the Ext Trig Input BNC connector and to a
VNA PCB Assembly mounting screw.
Removing Ext Trig Input BNC Connector:
6. Cut the cable tie (if used) that holds the Ext Trig Input and Ext Ref Input coaxial cables to the RF Out
semi-rigid.
7. Using the Tool T1451 socket, remove the BNC Connector Dress Nut from the Ext Trig Input connector.
Pull the Ext Trig Input connector from the Connector Face Plate and position it out of the way.
• Removing the Ext Trig Input connector provides access to one of the VNA Module PCB mounting
screws.
Removing VNA PCB Assembly:
8. Using a Phillips-head screwdriver, remove the eight (8) screws holding the VNA PCB Assembly in place.
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