Chapter 5 Troubleshooting Charts; Introduction; List Of Troubleshooting Charts; Rf Board Back-End - Motorola ASTRO Digital Spectra Plus Detailed Service Manual

Chapter 5 Troubleshooting Charts

5.1

Introduction

This chapter contains detailed troubleshooting flowcharts. These charts should be used as a guide in
determining the problem areas. They are not a substitute for knowledge of circuit operation and
astute troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions in
the theory section prior to troubleshooting a radio.
5.2

List of Troubleshooting Charts

Most troubleshooting charts (see
noted, but is good practice, to verify supplies and grounds to the affected IC, and 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
Chart C.1
Chart C.2
Chart C.3
Chart C.4
Chart C.5
Chart C.6
Chart C.7
Chart C.8
Chart C.9
Chart C.10
Chart C.11
Chart C.12
Chart C.13
Chart C.14
Chart C.15
Chart C.16
Chart C.17
Chart C.18
Chart C.19
Table 5-1) end up by pointing to an IC to replace. It is not always

Table 5-1. List of Troubleshooting Charts

RF Board Back-End

Command Board

Radio Power-Up Fail

Bootstrap Fail

01/90, General Hardware Failure

01/81, Host ROM Checksum Failure

01/82, or 002, External EEPROM Checksum Failure

01/84, SLIC Initialization Failure

01/88, MCU (Host μC) External SRAM Failure

01/92, Internal EEPROM Checksum Failure

02/A0, ADSIC Checksum Failure

02/81, DSP ROM Checksum Failure

02/88, DSP External SRAM Failure U414
02/84, DSP External SRAM Failure U403
02/82, DSP External SRAM Failure U402

02/90, General DSP Hardware Failure

09/10, Secure Hardware Failure

09/90, Secure Hardware Failure

No RX Audio

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