5-14
Troubleshooting Charts:
Power-Up Failure
Power-Up Failure – Low VCC_SW_1.875 Voltage
Low VCC_SW_1.875
Voltage
Measure Radio
Current
Is Standby
Current more
than 15mA above
Average
Board has a short,
Replace VOCON
Yes
Measure SW_B+
Voltage at R6549
Voltage =
SW_B+
Proceed to
Incorrect B+
Voltage
Measure Voltage
at R6431 on
VCC_5.0A Side
4.8 < V < 5.2?
Proceed to Low
LDO8 VCC_5.0A
Voltage Flow
Chart
Are Parts Solder
Connections and
Placement Correct
Replace or Repair
Part/s
Replace VOCON
Board
No
No
Yes
Yes
No
Measure Voltage
at R6431 on
BGAP_COMP
Side
2.2 < V < 2.7?
Measure Voltage
at R6420
2.2 < V < 2.7?
Replace VOCON
Board
Inspect and Repair
U6409 and
Supporting
Circuitry
Inspect U6508 and
All Supporting
Circuitry
No
Yes
Yes
No
No
Yes
Summary of Contents for ASTRO APX 7000
Page 1: ......
Page 4: ...iv Document History Notes ...
Page 24: ...2 4 Radio Power DC Power Routing VOCON Board Notes ...
Page 98: ...3 74 Theory of Operation Global Positioning System GPS ...
Page 163: ...Troubleshooting Charts PA Failure 5 59 ...
Page 164: ...5 60 Troubleshooting Charts PA Failure ...
Page 276: ...7 58 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 318: ...8 42 Schematics Boards Overlays and Parts Lists Transceiver RF Boards VHF 700 800 Notes ...
Page 380: ...8 104 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF1 700 800 MHz Notes ...
Page 432: ...8 156 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF1 VHF Notes ...
Page 458: ...8 182 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF1 UHF2 Notes ...
Page 498: ...8 222 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 700 800 MHz Notes ...
Page 546: ...8 270 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 VHF Notes ...
Page 606: ...8 330 Schematics Boards Overlays and Parts Lists VOCON Boards Notes ...
Page 638: ...Glossary 10 Glossary Notes ...
Page 643: ......