Technical Manual

9-1
Troubleshooting
Procedures 9
Introduction to
This Section
The purpose of this section is to aid in troubleshooting a
malfunctioning ASTRO Digital XTS 3000 radio. It is intended to be
detailed enough to localize the malfunctioning circuit and isolate the
defective component.
Handling
Precautions
Complementary metal-oxide semiconductor (CMOS) devices, and
other high-technology devices, are used in this family of radios. While
the attributes of these devices are many, their characteristics make
them susceptible to damage by electrostatic discharge (ESD) or high-
voltage charges. Damage can be latent, resulting in failures occurring
weeks or months later. Therefore, special precautions must be taken to
prevent device damage during disassembly, troubleshooting, and
repair. Handling precautions are mandatory for this radio, and are
especially important in low-humidity conditions. DO NOT attempt to
disassemble the radio without observing the following handling
precautions.
1. Eliminate static generators (plastics, Styrofoam, etc.) in the work
area.
2. Remove nylon or double-knit polyester jackets, roll up long
sleeves, and remove or tie back loose hanging neckties.
3. Store and transport all static-sensitive devices in ESD-protective
containers.
4. Disconnect all power from the unit before ESD-sensitive
components are removed or inserted unless otherwise noted.
5. Use a static-safeguarded workstation, which can be accomplished
through the use of an anti-static kit (Motorola part number 01-
80386A82). This kit includes a wrist strap, two ground cords, a
static-control table mat and a static-control floor mat. For
additional information, refer to Service and Repair Note SRN-
F1052, “Static Control Equipment for Servicing ESD Sensitive
Products,” available from Literature Distribution.
Motorola
Literature Distribution
2290 Hammond Drive
Schaumburg, IL 60173
[phone]
!
C a u t i o n
Most of the ICs are static sensitive devices. Do not
attempt to troubleshoot or disassemble a board
without first referring to the following Handling
Precautions section.