6-18 Replacing VNA PCB Assembly Assembly Removal and Replacement, MS202xC
6-30 PN: 10580-00307 Rev. D MS20xxC MM
6-18 Replacing VNA PCB Assembly
ND72088, ND72089, ND72090
This replacement procedure provides instructions for replacing the VNA PCB Assemblies for all variants of the
MS202xC VNA Masters. In general, the VNA PCB Assembly is removed as a complete unit and then
exchanged for a replacement part.
Part Numbers
• ND72088 – VNA PCB Assembly with N(f) connectors for MS2026C
For MS2026C instruments equipped with standard N(f) Test Ports
• ND72089 – VNA PCB Assembly with N(f) connectors for MS2027C and MS2028C
For MS2027C and MS2028C instruments equipped with standard N(f) Test Ports
• ND72090 – VNA PCB Assembly with K(f) connectors for MS2027C and MS2028C
For MS2027C and MS2028C instruments equipped with Option 11 K(f) Test Ports
Removal Procedure
Opening the Case:
1. Open the case as described in Section 6-16 “Opening the Instrument Case” on page 6-24.
Removing Power Monitor PCB, Option 5:
2. If the Power Monitor PCB (Option 5) is NOT installed, then skip ahead to Step 3. 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.
d. Holding the Ext Trig Input 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 a
VNA PCB Assembly mounting screw. Refer to Step 5.
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