Assembly Removal and Replacement, MS203xC 7-16 Opening the Instrument Case
MS20xxC MM PN: 10580-00307 Rev. D 7-29
c. J6002 (item 8 in Figure 7-14) is for the 100 MHz In connector. The other end is connected to J2200
on the Mother Board.
d. J4004 (item 7 in Figure 7-14) is for the 140 MHz IF connector. The other end is connected to J3203
on the Mother Board.
10. The two halves of the instrument can now be safely separated. The Case Back Assembly contains the
Spectrum Analyzer (SPA) board. The Case Front Assembly contains all of the other serviceable parts.
11. Refer to the following sections to remove and replace specific components of the instrument:
• Section 7-17 “Replacing SPA Module Assembly” on page 7-31
• Section 7-18 “Replacing VNA PCB Assembly” on page 7-37
• Section 7-19 “Replacing GPS Receiver Module (Option 31) – ND70320” on page 7-45
• Section 7-20 “Replacing Rotary Encoder – 3-410-101” on page 7-49
• Section 7-21 “Removing MS203xC Main PCB Assembly” on page 7-54
• Section 7-22 “Replacing MS203xC Main PCB Assembly” on page 7-61
• Section 7-23 “Replacing LCD Display – 3-15-154” on page 7-64
• Section 7-24 “Replacing Clear Plastic LCD Protector – 3-61368” on page 7-66
• Section 7-25 “Installing Main PCB and Reassembling Instrument” on page 7-67
• Section 7-26 “Replacing Fan Assembly – ND70948” on page 7-77
Closing the Case
1. With the Case Front Assembly and the Case Rear Assembly face down on a clean, stable work surface
that will not scratch the front panel, connect the Spectrum Analyzer cables.
2. Connect the Spectrum Analyzer cable assembly (ribbon cable, item 14 in Figure 7-5, and item 14 in
Figure 7-7) to connector J5001 of the SPA board in the back case. For a visual reference with all cables
connected, refer to Figure 7-14 on page 7-28.
3. Snap the cable clamp closed on connector J5001.
4. Route the RF cables through the other cable clamp in the back case, and connect the following cables to
the MMCX connections on the SPA PCB:
a. J4004 (item 7 in Figure 7-14) is for the 140 MHz IF connector. The other end is connected to J3203
on the Mother Board.
b. J6002 (item 8 in Figure 7-14) is for the 100 MHz In connector. The other end is connected to J2200
on the Mother Board.
c. J6000 (item 9 in Figure 7-14) is for the External Reference cable from the Ext. Ref. connector on
the top connector panel (attached to the VNA Assembly).
d. J6001 (item 11 in Figure 7-14) is for the 10 MHz Ref Out connector on the top connector panel
(attached to the VNA Assembly).
5. Carefully pivot the case back to close the case, guiding the cables and the top connector panel into case
grooves.
6. Use a Phillips screwdriver to replace the four (4) Pan Head Phillips-head screws securing the two Case
halves together. Torque these screws to 7.5 lbf·in (0.85 N·m).
Installing Battery:
Caution
Proper routing of the cables is important for instrument performance and for being able to
reassemble the case halves.
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