5-40
Troubleshooting Charts:
RX RF Failure
RX RF Failure – Page 6
Check LNA:
Check DC bias voltages for U406 at
the base (pin 1) & collector (pin 3).
Is base voltage =
0.778 V? and
collector voltage =
1.554 V?
Check DC bias voltages of Q402 at
the base (pin 2 or 5) , collector (pin
6) & emitter (pin 1).
Is base voltage = 1.024
V? Collector voltage =
0.777 V? Emitter
voltage = 1.554 V?
Check DC input line voltages
and visually inspect and
replace defective
components if needed.
No
Yes
No
Yes
Replace
U406
Replace
Q402
Check LNA:
Check DC bias voltages for U407 at
the base (pin 1) & collector (pin 3).
Is base voltage =
0.778 V? and
collector voltage =
1.552 V?
Check DC bias voltages of Q403 at
the base (pin 2 or 5), collector (pin
3) & emitter (pin 4).
Is base voltage = 1.025
V? Collector voltage =
0.778 V? Emitter voltage
= 1.552 V?
Check DC input line voltages
and visually inspect and
replace defective
components if needed.
No
Yes
No
Yes
Replace
U407
Replace
Q403
6
7
Note:
RF Test frequency used:
VHF: 154.275MHz
UHF1: 424.975MHz
UHF2: 485.075 MHz
700: 769.0625MHz
800: 860.0625MHz
Measured with a high impedance probe for relative comparisons
and troubleshooting only. Actual S21 gain or loss may differ if
the test point is not 50 ohms.
Содержание APX 6000
Страница 1: ...APX TWO WAY RADIOS APX 5000 APX 6000 APX 6000XE SRX 2200 Detailed Service Manuals ...
Страница 2: ......
Страница 6: ...iv Document History Notes ...
Страница 20: ...xviii CommercialWarranty Notes ...
Страница 26: ...2 4 Radio Power DC Power Routing VOCON Board Notes ...
Страница 100: ...3 74 Theory of Operation Bluetooth Notes ...
Страница 172: ...5 66 Troubleshooting Charts PA Failure Notes ...
Страница 176: ...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 183: ...Troubleshooting Waveforms Audio SSI 6 11 6 3 4 BCLK Trace 1 Trace recorded at R6107 Figure 6 9 Audio SSI BCLK Waveform ...
Страница 185: ...Troubleshooting Waveforms RX SSI 6 13 6 4 2 DA Trace 1 Trace recorded at R1005 Figure 6 11 RX SSI DA Waveform ...
Страница 186: ...6 14 Troubleshooting Waveforms RX SSI 6 4 3 FSYNC Trace 1 Trace recorded at R1004 Figure 6 12 RX SSI FSync Waveform ...
Страница 188: ...6 16 Troubleshooting Waveforms TX SSI 6 5 2 DA Trace 1 Trace recorded at R1017 Figure 6 14 TX SSI DA Waveform ...
Страница 189: ...Troubleshooting Waveforms TX SSI 6 17 6 5 3 FSYNC Trace 1 Trace recorded at R1007 Figure 6 15 TX SSI FSync Waveform ...
Страница 190: ...6 18 Troubleshooting Waveforms SPI 6 6 SPI 6 6 1 CLK Trace 1 Trace recorded at R1003 Figure 6 16 SPI CLK Waveform ...
Страница 191: ...Troubleshooting Waveforms SPI 6 19 6 6 2 MOSI Trace 1 Trace recorded at Pin 31 of J1001 Figure 6 17 MOSI Waveform ...
Страница 192: ...6 20 Troubleshooting Waveforms SPI 6 6 3 MISO Trace 1 Trace recorded at Pin 29 of J1001 Figure 6 18 MISO Waveform ...
Страница 193: ...Troubleshooting Waveforms SPI 6 21 6 6 4 CS Trace 1 Trace recorded at R1018 Figure 6 19 CS Waveform ...
Страница 195: ...Troubleshooting Waveforms I2C BUS 6 23 6 7 2 SCL 5V Trace 1 Trace recorded at R2204 Figure 6 21 I2C Bus SCA 5V Waveform ...
Страница 196: ...6 24 Troubleshooting Waveforms I2C BUS 6 7 3 SDA Trace 1 Trace recorded at R6209 Figure 6 22 I2C Bus SDA Waveform ...
Страница 200: ...6 28 Troubleshooting Waveforms USB 6 10 USB 6 10 1 D Trace 1 Trace recorded at TP F_GCAI_USB Figure 6 26 USB D Waveform ...
Страница 201: ...Troubleshooting Waveforms USB 6 29 6 10 2 D Trace 1 Trace recorded at TP F_GCAI_USB Figure 6 27 USB D Waveform ...
Страница 203: ...Troubleshooting Waveforms UART 6 31 6 11 2 TX Trace 1 Trace recorded at TP F_BOOT_TX Figure 6 29 UART TX Waveform ...
Страница 205: ...Troubleshooting Waveforms SDRAM 6 33 6 12 2 CLKX Trace 1 Trace recorded at TP6308 Figure 6 31 SDRAM CLKX Waveform ...
Страница 250: ...6 78 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Страница 276: ...7 26 Troubleshooting Tables List of Board and IC Signals Notes ...
Страница 300: ...8 24 Schematics Boards Overlays and Parts Lists Transceiver RF Boards VHF Notes ...
Страница 336: ...8 60 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF1 Notes ...
Страница 378: ...8 102 Schematics Boards Overlays and Parts Lists Transceiver RF Boards 700 800 MHz Notes ...
Страница 432: ...Glossary 10 Glossary Notes ...
Страница 437: ......