Button Test Troubleshooting Chart; Volume Set Error Troubleshooting Chart; Zone/Channel Select Error Troubleshooting Chart; Top/Side Button Error Troubleshooting Chart - Motorola ASTRO XTS 2500 Service Manual

UHF2 Troubleshooting Charts: Introduction

Chapter 6.3 UHF2 Troubleshooting Charts

6.3.1 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
Radios Basic Service Manual (Motorola part number 6816984H01), which uses the pass/fail service
approach to radio problems.

6.3.2 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 2 Radio Main Troubleshooting Chart
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 2 Receive RF Troubleshooting Chart

VOCON Receive Audio Troubleshooting Chart

UHF Range 2 Frequency Generation Unit Troubleshooting Chart
VOCON Transmit Audio Troubleshooting Chart

No Transmit Deviation Troubleshooting Chart

UHF Range 2 Transmitter RF Troubleshooting Chart

Secure Hardware Failure

NOTE: µC is used in several of the following troubleshooting charts.
µC = microcontroller unit (MCU).
6816985H01-B
Table 6.3-1. List of Troubleshooting Flowcharts
6.3-1
I
Digital Portable
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6.3-12
6.3-13
6.3-16
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6.3-19
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August 16, 2007