Anritsu VNA Master MS2026C Maintenance Manual

Assembly Removal and Replacement, MS202xC 6-26 Replacing Fan Assembly – ND70948
MS20xxC MM PN: 10580-00307 Rev. D 6-57
6-26 Replacing Fan Assembly – ND70948
This replacement procedure provides instructions for replacing the Fan Assembly for all variants of the
MS202xC VNA Masters. In general, the case is opened and the Fan Assembly is replaced without disturbing
any of the PCBs. and without disconnecting any RF cables. The entire Fan Assembly is then exchanged for a
replacement part.
Part Numbers
• ND70948 – Fan Assembly for MS2026C, MS2027C and MS2028C instruments
Procedure
Summary:
• Open the case.
• If the Power Monitor option (Option 5) is installed, then remove the connector and PCB.
• If the GPS option (Option 32) is installed, then disconnect the GPS Antenna SMA connector.
• Unscrew and move the VNA PCB Assembly, but do not disconnect its cables.
• Remove and replace the Fan Assembly.
• Replace the VNA PCB Assembly.
• Replace the GPS Antenna SMA connector, if necessary.
• Replace the Power Monitor connector and PCB, if necessary.
• Close the Case.
• Replace the battery.
• Restart the instrument and perform a function check.
Opening the Case:
1. Open the case as described in Section 6-16 “Opening the Instrument Case” on page 6-24.
Follow Step 1 through Step 5.
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 6-22 on page 6-60 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.

Anritsu VNA Master MS2026C Specifications

General

Brand	Anritsu
Model	VNA Master MS2026C
Category	Measuring Instruments
Language	English