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 VCC_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
Display
Main Display Failure
5-22
Knob/ Button/ Keypad
Volume/Channel Error
5-23
Keypad Error
5-24
Side Button Error
5-25
RX Audio
External Audio
5-26
Internal Audio
5-27
TX Audio
Internal Microphone
5-28
External Mic Failure
5-29
RX RF
RX RF Failure
5-30
FGU
Table 5-1. Troubleshooting Charts (Continued)
Troubleshooting
Page
No.
Summary of Contents for APX 2000
Page 1: ...APXTM TWO WAY RADIOS APX 1000 APX 2000 APX 4000 APX 4000Li DETAILED SERVICE MANUAL ...
Page 4: ......
Page 6: ...iv Document History Notes ...
Page 8: ...Notes vi Commercial Warranty ...
Page 10: ...Notes ...
Page 22: ...xiv List of Figures Notes ...
Page 226: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 688: ...Index 4 Index Notes ...
Page 690: ...ii Notes ...
Page 700: ...xvi List of Figures Notes ...
Page 806: ...5 50 Troubleshooting Charts PA Failure Notes ...
Page 1008: ...8 178 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 84012621001 Notes ...
Page 1062: ...8 234 Schematics Boards Overlays and Parts Lists Keypad Board M2 and M3 PC000261A01 Notes ...
Page 1064: ...ii Notes ...
Page 1068: ...Notes A 4 EMEA Warranty Service and Technical Support Further Assistance From Motorola ...
Page 1090: ...Glossary 10 Glossary Notes ...
Page 1094: ...Index 4 Index Notes ...
Page 1095: ......