
5-58
Troubleshooting Charts:
PA Failure
Notes
PA Failure – Page 10 (UHF2 ALC)
Measure voltage at
pin 3 (UHF2/7800) or
pin1 (UHF2/VHF) or
pin1 (UHF1/UHF2) of U1145
U1145 pin 1 or pin 3
2.2V +/- 0.6V?
Replace U1501
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
VC_OFFSET low,
remove SH13
U1133 pin 6
about 5V?
TX in Current control mode?
U1133 pin 3 4.1V
+/- 0.6?
PA_OFFSET low,
check U1125 pin 1
for approx. 1V, else
replace U1133
R1181 close to 5V?
Measure TP120
No
TP120 1.8V?
No
No
Yes
Check P101 or VOCON
signal DIG_CTRL_IO49
Replace U1139 or
associated logic
Remove SH9 and
measure U1142 pin4
U1142 pin 4
1.00V +/- 0.3V?
Measure thermal cutback
circuit output at U1113,
U1114, and U1121
Pin 4 of U1113,
U1114, & U1121
at 0V (logic low)?
Replace log amp, U1105,
else U1112, else check
R1106 for 17 +/- 1 Ohm
Check temp sensor
U1103, else U1148
U1131, pin 4
is 5V?
Replace U1132
No
Yes
TX is in current control mode, else PA is
saturated. Check SAT Reference tuning
per 12M to ensure tuning is not low.
Measure voltage divider
at power tuning DAC, top
of R1121
R1121 around
2.45 V +/- 0.15?
Power tuning is low, else
replace U1125, else U1137,
U1138.
Measure TP101
voltage
TP101
closed to `1.5V?
ANA_CTRL_ISET low. Check R1160
for wrong value, else check connector
P101, or MAKO IC on Vocon
Remove SH11 & measure
output pin 4 of U1130
U1101 Pin 1
< 1.3V?
Transmitter PA overcurrent condition,
else check U1101, R1103.
Replace U1129 and
U1130
Yes
?
U1127 pin 4
approximately
1.10 +/- 0.05V
Replace U1126 and
U1127
Replace U1142
10
Remove SH5 & measure
PA control voltage at U1501 pin 4
U1130 pin 4
approximately
1.10±0.05V?
Содержание ASTRO APX 7000
Страница 1: ......
Страница 4: ...iv Document History Notes ...
Страница 24: ...2 4 Radio Power DC Power Routing VOCON Board Notes ...
Страница 98: ...3 74 Theory of Operation Global Positioning System GPS ...
Страница 104: ...4 6 Troubleshooting Procedures Power Up Self Check Diagnostics and Repair Not for Field Use Notes ...
Страница 163: ...Troubleshooting Charts PA Failure 5 59 ...
Страница 164: ...5 60 Troubleshooting Charts PA Failure ...
Страница 168: ...6 4 Troubleshooting Waveforms Clocks 6 2 2 4 MHz Clock Trace 1 Trace recorded at R6113 Figure 6 2 4 MHz Clock Waveform ...
Страница 174: ...6 10 Troubleshooting Waveforms Audio SSI 6 3 3 Sync Trace 1 Trace recorded at R3005 Figure 6 8 Audio SSI Sync Waveform ...
Страница 175: ...Troubleshooting Waveforms Audio SSI 6 11 6 3 4 BCLK Trace 1 Trace recorded at R3006 Figure 6 9 Audio SSI BCLK Waveform ...
Страница 177: ...Troubleshooting Waveforms RX SSI 6 13 6 4 2 DA Trace 1 Trace recorded at R1005 Figure 6 11 RX SSI DA Waveform ...
Страница 178: ...6 14 Troubleshooting Waveforms RX SSI 6 4 3 FSync Trace 1 Trace recorded at R1004 Figure 6 12 RX SSI FSync Waveform ...
Страница 180: ...6 16 Troubleshooting Waveforms TX SSI 6 5 2 DA Trace 1 Trace recorded at R1017 Figure 6 14 TX SSI DA Waveform ...
Страница 181: ...Troubleshooting Waveforms TX SSI 6 17 6 5 3 FSync Trace 1 Trace recorded at R1007 Figure 6 15 TX SSI FSync Waveform ...
Страница 182: ...6 18 Troubleshooting Waveforms SPI 6 6 SPI 6 6 1 CLK Trace 1 Trace recorded at R6605 Figure 6 16 SPI CLK Waveform ...
Страница 183: ...Troubleshooting Waveforms SPI 6 19 6 6 2 CLK INV Trace 1 Trace recorded at R2325 Figure 6 17 SPI CLK INV Waveform ...
Страница 184: ...6 20 Troubleshooting Waveforms SPI 6 6 3 CS Trace 1 Trace recorded at Pin 34 of J2301 Figure 6 18 SPI CS Waveform ...
Страница 185: ...Troubleshooting Waveforms SPI 6 21 6 6 4 MOSI Trace 1 Trace recorded at R6603 Figure 6 19 SPI MOSI Waveform ...
Страница 187: ...Troubleshooting Waveforms I2C BUS 6 23 6 7 2 SCL 5V Trace 1 Trace recorded at R6204 Figure 6 21 I2C Bus SCA 5V Waveform ...
Страница 188: ...6 24 Troubleshooting Waveforms I2C BUS 6 7 3 SDA Trace 1 Trace recorded at R6209 Figure 6 22 I2C Bus SDA Waveform ...
Страница 194: ...6 30 Troubleshooting Waveforms USB 6 10 2 D Trace 1 Trace recorded at Pin 35 of J3001 Figure 6 28 USB D Waveform ...
Страница 196: ...6 32 Troubleshooting Waveforms UART 6 11 2 TX Trace 1 Trace recorded at F_Boot_Tx Figure 6 30 UART TX Waveform ...
Страница 198: ...6 34 Troubleshooting Waveforms SDRAM 6 12 2 CLKX Trace 1 Trace recorded at TP6308 Figure 6 32 SDRAM CLKX Waveform ...
Страница 276: ...7 58 Troubleshooting Tables List of Board and IC Signals Notes ...
Страница 318: ...8 42 Schematics Boards Overlays and Parts Lists Transceiver RF Boards VHF 700 800 Notes ...
Страница 380: ...8 104 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF1 700 800 MHz Notes ...
Страница 432: ...8 156 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF1 VHF Notes ...
Страница 458: ...8 182 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF1 UHF2 Notes ...
Страница 498: ...8 222 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 700 800 MHz Notes ...
Страница 546: ...8 270 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 VHF Notes ...
Страница 606: ...8 330 Schematics Boards Overlays and Parts Lists VOCON Boards Notes ...
Страница 638: ...Glossary 10 Glossary Notes ...
Страница 643: ......