Controller Section; Introduction; Location; Daughtercard Module - Motorola ASTRO XTL 5000 Basic Service Manual

3-2
3.3

Controller Section

3.3.1

Introduction

The XTL 5000 radio is primarily a uniboard design, consisting of isolated topside and bottomside
controller sections and various RF sections. The controller section will be discussed here in basic
terms, to assist in the overall understanding of what is contained in the controller section, and a
simplified purpose of its elemental parts. Some limited warnings and recommendations are offered
for prevention of common repair-induced damage.
The controller section combines the elements of a VOCON board, with the elements of a command
board. The controller section also contains a daughtercard module. We distinguish the entire
controller section into 2 parts: the "daughtercard module" and the "surrounding controller region".
3.3.2

Location

The controller section is located on the far side of the board, with critical parts arranged on the top
and bottom sides of the uniboard. (see
controller section).
Troubleshooting of the controller section usually requires the removal of the
!
uniboard from the chassis. Whenever this board is removed, any
transmitting of the RF section, whether intentional or accidental (trunking
C a u t i o n
affiliation), can cause permanent destruction or degradation of various RF
components. Such damage may not be visually noticeable, but can impact
the radios performance and reliability.
3.4

Daughtercard Module

This module contains primarily three parts: microprocessor, FLASH IC, and SRAM IC.
NOTE: The three parts on the daughtercard module are highly susceptible to ESD and moisture
damage. Extreme care is advised.
June 11, 2003
Figure 3-1
SIDE 1

Figure 3-1. Controller Sections

Basic Theory of Operation: Controller Section
below, with component-filled areas denoting
DAUGHTERCARD
MODULE
SIDE 2
6881096C73-O