Removal and Replacement 6-5 Disassembly Sequence Overview
Model MS20xxB MM PN: 10580-00303 Rev. D 6-13
6-5 Disassembly Sequence Overview
Except for replacing the Rotary Knob, the case must be opened for all maintenance operations. Part numbers
for all replaceable parts are found in Table 1-7, “List of Replaceable Parts” on page 1-8.
The figures at the beginning of this chapter reveal the inner construction of the VNA Master instruments. The
removal and replacement instructions are described in the following sections:
• Section 6-6 “Opening the Instrument Case” on page 6-14
• Section 6-7 “PCB Assembly Replacement (MS202xB and MS203xB)” on page 6-17
Section 6-7 is preliminary to the remaining sections,
• Section 6-8 “SPA Assembly Replacement” on page 6-19
• Section 6-9 “GPS (Option 31) Replacement” on page 6-24
• Section 6-10 “Ethernet PCB Assembly (Option 411) Replacement” on page 6-26
• Section 6-11 “Main/VNA PCB Assembly Replacement” on page 6-28
• Section 6-12 “Main/VNA/DSP PCB Assembly Replacement” on page 6-29
• Section 6-13 “Fan Assembly Replacement” on page 6-30
• Section 6-14 “LCD Assembly Replacement” on page 6-32
• Section 6-15 “LCD Backlight PCB Removal and Replacement” on page 6-35
• Section 6-16 “Keypad and Keypad PCB Replacement” on page 6-36
• Section 6-17 “Touch Screen Replacement” on page 6-37
Caution
Only qualified personnel should open the case and replace internal assemblies. Assemblies that are
shown in the replaceable parts list are typically the only items that may be replaced.
Because they are highly fragile, items that must be soldered may not be replaced without specialized
training.
Removing RF shields from PC boards, or adjusting screws on or near the shields may detune
sensitive RF circuits and will result in degraded instrument performance.
All work must be performed in a static-safe work area.
Note
Before opening the case, Anritsu Company strongly recommends that all internally-saved files be
saved to a PC by using the Master Software Tools utility program, or that they be copied to an
external USB flash drive. In the event that the Main/VNA PCB needs to be replaced, this
recommended action will prevent permanent loss of these files.
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