Assembly Removal and Replacement, MS202xC 6-22 Replacing MS202xC Main PCB Assembly
MS20xxC MM PN: 10580-00307 Rev. D 6-47
6-22 Replacing MS202xC Main PCB Assembly
This procedure begins with the assumption that the Main PCB Assembly has been removed from the
instrument as described in Section 6-21 “Removing MS202xC Main PCB Assembly” on page 6-44 and that the
Main PCB Assembly is to be replaced. The basic replacement procedure is the same for MS2026C, MS2027C,
and MS2028C instruments.
If an assembly mounted on or under the Main PCB is to be replaced, then skip to the appropriate section:
• Section 6-23 “Replacing LCD Display – 3-15-154” on page 6-50
• Section 6-24 “Replacing Clear Plastic LCD Protector – 3-61368” on page 6-51
Part Numbers
• ND72084 or ND78490 – Main PCB Assembly for MS2026C instruments
• VNA PCB Assembly not included
• LCD Display not included
• GPS Receiver Module PCB not included
• ND75364 – Main PCB Assembly for MS2027C instruments
• VNA PCB Assembly not included
• LCD Display not included
• GPS Receiver Module PCB not included
• ND72085 or ND74891 – Main PCB Assembly for MS2028C instruments
• VNA PCB Assembly not included
• LCD Display not included
• GPS Receiver Module PCB not included
Procedure
1. The Main PCB Assembly has been removed from the Case Front Assembly.
Preparing the Replacement Main PCB:
2. If the LCD Panel Assembly is to be replaced, then skip to Section 6-23 “Replacing LCD Display –
3-15-154” on page 6-50. If the LCD Panel Assembly is not to be replaced, then continue here:
Removing the LCD Display:
3. Disconnect the LCD multi-pin cable (the LCD Signal cable) going to J4202 on the removed Main PCB
Assembly (refer to Figure 6-18). The cable remains attached to the LCD Panel.
4. Disconnect the LCD Backlight cable going to P6000 on the removed Main PCB Assembly (refer to item 3
in Figure 6-19).
5. Undo the four (4) Phillips-head screws holding the LCD Display in place and set the LCD aside.
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