MS2721B MM PN: 10580-00177 Rev. D 4-1
Chapter 4 — Remove and Replace
4-1 Introduction
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.
4-2 Remove and Replace Instructions
4-3 Battery Pack Removal and Replacement
This section provides instructions for removing and replacing the MS2721B battery pack.
1. With the MS2721B laying flat, face up, on a stable surface, locate the battery access door, as illustrated in
Figure 4-1.
Caution
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.
Caution
An Electrostatic Discharge (ESD) safe work area and proper ESD handling procedures (that conform
to ANSI/ESD S20.20-1999 or ANSI/ESD S20.20-2007) are mandatory to avoid ESD damage when
handling subassemblies or components that are found in the MS2721B.
Additional information pertaining to ESD can be found at the ESD Association Web site:
http://www.esda.org/s2020.html
Note
Some of the procedures in this section are generic, and apply to many similar instruments. Photos
and illustrations are representative and may show instruments other than the MS2721B.
Figure 4-1. Battery Access Door Notch
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