5-14
Troubleshooting Charts:
Power-Up Failure
Power-Up Failure – Low V_EXT_1.85 Voltage
Low V_ENT_1.85 Voltage
Measure Radio
Current
Is standy
current > 15mA
above avg?
Board has a short,
replace board
Measure
V_SW_3.6
Voltage at R6510
No
Yes
Voltage =
V_SW_3.6
Proceed to
Incorrect
V_SW_3.6
Voltage
Measure Voltage
R6431 on V_5.0A
Side
No
Yes
4.8 < V < 5.2
Measure Voltage
at R6431 on
BGAP_COMP
side
Yes
Proceed to Low
LD08 V_5.0A
Voltage Flow
Chart
No
2.2 < V < 2.7?
Measure Voltage
at R6420
Inspect U6508 and
All Supporting
Circuitry
Yes
Yes
No
Inspect and repair
U6409 and
Replace Main
Board
No
Are Parts Solder
Connections &
Placement Correct
Replace or repair
Parts
Replace Main Board
No
2.2 < V < 2.7?
Supporting
Circuitry
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: ......