Chapter 6.2 Uhf1 Troubleshooting Charts; Introduction; List Of Troubleshooting Flowcharts - Motorola XTS 2500 Service Manual

Chapter 6.2 UHF1 Troubleshooting Charts

6.2.1 Introduction

This chapter contains detailed troubleshooting flowcharts. These flowcharts are for use as a guide in
determining the problem areas. They are not a substitute for the knowledge of circuit operation and
astute troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions in
the theory sections prior to troubleshooting a radio.
This manual is to be used in conjunction with the ASTRO XTS 2500/XTS 2500
Digital Portable Radios Basic Service Manual (Motorola part number 6816984H01), which uses the
pass/fail service approach to radio problems.

6.2.2 List of Troubleshooting Flowcharts

Most troubleshooting flowcharts end up by pointing to an IC to replace. It is not always noted, but it
is good practice to verify supplies and grounds to the affected IC and to trace continuity to
the malfunctioning signal and related circuitry before replacing any IC. For instance, if a clock
signal is not available at a destination IC, continuity from the source IC should be checked before
replacing the source IC.
Chart Name
UHF Range 1
Radio Power-Up Fail Troubleshooting Chart
DC Supply Fail Troubleshooting Chart
Button Test Troubleshooting Chart
Volume Set Error Troubleshooting Chart
Zone/Channel Select Error Troubleshooting Chart
Top/Side Button Error Troubleshooting Chart
No Display Troubleshooting Chart
UHF Range 1 Receive RF Troubleshooting Chart
VOCON Receive Audio Troubleshooting Chart
UHF Range 1 Frequency Generation Unit Troubleshooting Chart
VOCON Transmit Audio Troubleshooting Chart
No Transmit Deviation Troubleshooting Chart
UHF Range 1 Transmitter RF Troubleshooting Chart
Secure Hardware Failure
NOTE: µC is used in several of the following troubleshooting charts.
µC = microcontroller unit (MCU).
Table 6.2-1. List of Troubleshooting Flowcharts
Radio Main Troubleshooting Chart
I/
XTS 2000/ATS 3000
Page No.
6.2-2
6.2-3
6.2-6
6.2-9
6.2-10
6.2-11
6.2-12
6.2-13
6.2-16
6.2-17
6.2-18
6.2-19
6.2-21
6.2-22
6.2-23