Chapter 4 Troubleshooting Procedures; Astro Spectra Procedures; Handling Precautions - Motorola ASTRO Digital Spectra Service Manual

Chapter 4 Troubleshooting Procedures

4.1

ASTRO Spectra Procedures

This section will aid you in troubleshooting a malfunctioning ASTRO Digital Spectra radio. It is
intended to be detailed enough to localize the malfunctioning circuit and isolate the defective
component.
NOTE: Refer to
specific to the ASTRO Spectra Plus radio.
C a u t i o n
4.1.1

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.
6. Always wear a conductive wrist strap when servicing this equipment. The Motorola part
number for a replacement wrist strap that connects to the table mat is 42-80385A59.
"4.2 ASTRO Spectra Plus Procedures" on page 4-10
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.
for troubleshooting information