Chapter 5 Troubleshooting Charts
This section 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 of operation sections prior to troubleshooting a radio.
5.1
List of Troubleshooting Charts
Most troubleshooting charts (see
Table 5-1
) 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, continuity from the source IC should be checked before
replacing the source IC.
Table 5-1. Troubleshooting Charts
Troubleshooting
Page
No.
Main Troubleshooting
Main Troubleshooting Flowchart
5-3
Power-Up Failure
Main Board
5-4
B+ Incorrect Voltage
5-5
Low LDO10 V_3.3 Voltage
5-6
Low LDO3 V_1.55 Voltage
5-7
Low LDO8 V_5.0A Voltage
5-8
Low VBUS2 Voltage
5-9
Low V_SW_1.4 Voltage
5-10
Low V_2.23 Voltage
5-11
Low V_SW_3.6 Voltage
5-12
Low V_SW_5 Voltage
5-13
Low V_EXT_1.85 Voltage
5-14
DC Supply
DC Supply 5 Volt Failure
5-15
DC Supply 3.6 Volt Failure
5-16
DC Supply 3 Volt Failure
5-17
DC Supply 1.85 Volt Failure
5-18
DC Supply 1.8 Volt Failure
5-19
DC Supply 1.5 Volt Failure
5-20
DC Supply 1.4 Volt Failure
5-21
Button
Side Button Error
5-22
Audio
External Audio
5-23
External Mic Failure
5-24
Keyload/ Secure Hardware/ Memory
Keyload Failure
5-25
Secure Hardware Failure
5-26
RX RF
RX RF Failure
5-27
FGU
FGU Failure
5-37
VCO
VCO Failure
5-38
GPS
GPS Failure
5-43
Table 5-1. Troubleshooting Charts (Continued)
Troubleshooting
Page
No.
Summary of Contents for Astro APX 3000
Page 1: ...APXTM TWO WAY RADIOS APX 3000 DETAILED SERVICE MANUAL ...
Page 2: ......
Page 4: ...Notes ...
Page 6: ...vi Document History Notes ...
Page 10: ...x Table of Contents Notes ...
Page 12: ...xii List of Tables Notes ...
Page 18: ...xviii List of Figures Notes ...
Page 22: ...xxii CommercialWarranty Notes ...
Page 46: ...3 20 Theory of Operation Main Board Notes ...
Page 84: ...3 58 Theory of Operation Bluetooth Notes ...
Page 208: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 222: ...7 14 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 282: ...8 60 Schematics Boards Overlays and Parts Lists Main Board Block UHF1 84012513001_A Notes ...
Page 390: ...8 168 Schematics Boards Overlays and Parts Lists Main Board Block VHF 84012512001_A Notes ...
Page 456: ...9 8 Debugging Fixture Powering up Covert Board Notes ...
Page 468: ...Glossary 10 Glossary Notes ...
Page 472: ...Index 4 Index Notes ...
Page 473: ......