Assembly Removal and Replacement, MS203xC 7-26 Replacing Fan Assembly – ND70948
MS20xxC MM PN: 10580-00307 Rev. D 7-77
7-26 Replacing Fan Assembly – ND70948
This replacement procedure provides instructions for replacing the Fan Assembly for all variants of the
MS203xC 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 MS2036C, MS2037C and MS2038C instruments
Procedure
Opening the Case:
1. Open the case as described in Section 7-16 “Opening the Instrument Case” on page 7-26.
2. Follow Step 1 through Step 7.
Figure 7-41 shows model MS2036C. All steps to remove and replace the Fan Assembly are the same for
MS2036C, MS2037C and MS2038C instruments.
Disconnecting GPS Antenna Cable:
3. If the GPS Receiver Module PCB (Option 31) is NOT installed, then skip ahead to Step 4, noting the
preliminary directions in section “Moving the VNA PCB Assembly:”. If the GPS Receiver Module PCB is
installed, then perform the following sub steps:
a. Use two 5/16 inch (≅ 8 mm) wrenches to disconnect the GPS Antenna SMA connector (item 11 in
Figure 7-18) from the top connector panel.
b. Remove the nut and lock washer and then remove the SMA connector from the top connector
panel.
c. Replace the lock washer and nut onto the SMA connector for safe keeping.
d. Route the cable to the side, clearing the notch and the top connector panel, so it is clear of the VNA
PCB Assembly.
e. Removing the GPS Antenna SMA connector also provides easier access to one of the VNA PCB
Assembly mounting screws.
Moving the VNA PCB Assembly:
In this procedure, the VNA PCB Assembly is not removed completely, but is moved only far enough to expose
the required Fan Assembly components.
Identifying VNA PCB Assembly Mounting Screws:
Figure 7-41 shows model MS2036C. All steps to remove and replace the VNA PCB Assembly are the same for
MS2036C, MS2037C and MS2038C instruments. In model MS2037C and MS2038C, the microwave module
replaces the 2 semi-rigid cables.
4. Using Figure 7-41, identify the locations of the eight (8) Phillips-head mounting screws that hold the
VNA Assembly PCB in place. Figure 7-42 shows the 8 hexagonal standoffs on the Mother Board. The
8 VNA Assembly PCB screws attach to the 8 hexagonal standoffs in the Main PCB (Mother Board).
To Next Page
Loading...
Need help?
General
