Troubleshooting Charts:
Power-Up Failure
5-3
5.3
Power-Up Failure – VOCON Board
VOCON Board Power Up
Problem
Measure Voltage
at R6505
6 < V < 9?
Proceed to
Incorrect B+
Voltage Flow
Chart
Measure Voltage
at R6542
3.3 < V < 3.9
Proceed to Low
VCC_SW_3.6
Flow Chart
Use Oscilloscope
to Measure R6572
Freq = 24MHz
1.6 < V < 1.9
Inspect Y6501 and
All supporting
Circuitry
Repair or Replace
Part/s
Replace VOCON
Board
Are Parts Solder
Connections and
Placement Correct
No
Yes
Measure All Probe
Spots from Above
Table
Voltages =
Level
Proceed to
Specified Flow
Chart in Table
Measure Voltage
at R6203
1.6 < V < 1.9
Replace VOCON
Board
No
Yes
No
Yes
No
Yes
No
Yes
No
Use Oscilloscope
to Measure R6115
Yes
Freq = 32kHz
1.6 < V < 1.9
Replace VOCON
Board
Use Oscilloscope
and High
Impedance Probe
to Measure
C6602
Freq = 12MHz
1.3 < V < 1.9
Inspect Y6601
Circuit
Repair or Replace
Part/s
Are Parts Solder
Connections and
Placement Correct
No
Yes
No
Yes
No
Measure Voltage
at R2217
Yes
1.6 < V < 1.9
OMAP is Out of
Reset, Proceed to
Memory Flow
Chart
Yes
Replace VOCON
No
Name
Ref
Description
Level V
Flow Chart
VCC_1.875
C4001_4 LDO Output
1.875±10%
Low LDO3 VCC_1.55 Voltage
VCC_1.55
R6561_6 LDO Output
1.55±10%
Low LDO3 VCC_1.55 Voltage
VCC_2.775D
R4011_4 LDO Output
2.775±10%
Low LDO10 VCC_3.3 Voltage
VCC_2.775
R6563_6 LDO Output
2.775±10%
Low LDO10 VCC_3.3 Voltage
VCC_2.8
R6564_6 LDO Output
2.8±10%
Low LDO10 VCC_3.3 Voltage
VCC_5.0A
R6565_6 LDO Output
5.0±10%
Low LDO8 VCC_5.0A Voltage
VCC_3.3
R6566_6 LDO Output
3.3±10%
Low LDO10 VCC_3.3 Voltage
VCC_3.0A
R6567_6 LDO Output
3.0±10%
Low LDO10 VCC_3.3 Voltage
VCC_SW_3.6
C6561_6 Switching Output 3.6±10%
Low VCC_SW_3.6 Voltage
VCC_SW_1.875 R2302_2 Switching Output 1.875±10%
Low VCC_SW_1.875 Voltage
VCC_SW_1.4
E6502_6 Switching Output 1.4±10%
Low VCC_SW_1.4 Voltage
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: ......