6-7 PCB Assembly Replacement (MS202xB and MS203xB) Removal and Replacement
6-18 PN: 10580-00303 Rev. D Model MS20xxB MM
2. Disconnect the Keypad PCB connector (item 7 in Figure 6-14), the Fan Assembly cable connector (item 4
in Figure 6-14), and the LCD connector (item 5 in Figure 6-14).
3. Use a Phillips screwdriver to remove the 4 screws (item 6 in Figure 6-14) that secure the entire PCB
assembly to the front case.
4. After the screws are removed, the entire PCB Assembly (including the top connector panel) can be
removed from the case.
Models MS2024B and MS2025B use the same 4 screws to hold the Mother Board to the case as do
models MS2034B and MS2035B.
Installation of PCB Assembly:
5. Installation is the reverse of removal.
6. Carefully insert the PCB Assembly and its attached top connector panel into the case. Align the top
connector panel and the vent grills with grooves in the case. Confirm that none of the cables will be
pinched when the back case is replaced.
7. On VNA Master models MS2024B and MS2025B, replace the 4 screws that hold the Mother Board to the
case (item 6 in Figure 6-14). Torque these screws to 6 lbf·in (0.68 N·m).
8. On VNA Master models MS2034B and MS2035B, replace the 4 screws that hold the Mother Board to the
case (the same screws as described in Step 7),
a. If the SPA PCB has been separated from the Mother Board PCB assembly, then replace the
4 screws (2 screws on each side, item 3 in Figure 6-14) that attach the SPA PCB Assembly to the
side brackets of the Mother Board. Torque these 4 screws to 7.5 lbf·in (0.85 N·m).
b. Also replace the 2 screws (item 2 in Figure 6-14) that hold the SPA PCB to the top connector panel.
c. Reattach any cables that may have been removed.
9. Connect the battery cable to the Mother board and close the case, as described in Section “Case
Reassembly:” on page 6-16.
10. Torque the 6case screws to 6lbf·in (0.68N·m).
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