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Motorola Astro Digital Mobile Radio Xtl5000 Detailled 6881096c74 B Manual
Motorola Astro Digital Mobile Radio Xtl5000 Detailled 6881096c74 B Manual
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Page 201
6881096C74-BMay 25, 2005
Troubleshooting Charts: Flowcharts5-21
5.6.7 Low or No RX Injection Signal (136–174 MHz)
Figure 5-11. Low or No RX Injection Signal (136–174 MHz)
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Page 202
May 25, 20056881096C74-B
5-22Troubleshooting Charts: Flowcharts
5.6.8 Low or No TX Injection Signal (136–174 MHz)
Figure 5-12. Low or No TX Injection Signal (136–174 MHz)
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Page 203
6881096C74-BMay 25, 2005
Troubleshooting Charts: Flowcharts5-23
5.6.9 TX or RX VCO Unlock (Fail 001) (136–174 MHz)—Part 1 of 2
Figure 5-13. TX or RX VCO Unlock (Fail 001) (136–174 MHz)—Part 1 of 2
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Page 204
May 25, 20056881096C74-B
5-24Troubleshooting Charts: Flowcharts
5.6.10 TX or RX VCO Unlock (Fail 001) (136–174 MHz)—Part 2 of 2
Figure 5-14. TX or RX VCO Unlock (Fail 001) (136–174 MHz)—Part 2 of 2
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Page 205
6881096C74-BMay 25, 2005
Troubleshooting Charts: Flowcharts5-25
5.6.11 No Output Power at TX Mode (136–174 MHz)
Figure 5-15. No Output Power at TX Mode (136–174 MHz)
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Page 206
May 25, 20056881096C74-B
5-26Troubleshooting Charts: Flowcharts
5.6.12 No Output Power and IDC < 2A at TX Mode (136–174 MHz)
Figure 5-16. No Output Power and IDC < 2A at TX Mode (136–174 MHz)
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Page 207
6881096C74-BMay 25, 2005 Troubleshooting Charts: Flowcharts5-27 5.6.13 No 16.8 MHz Reference Oscillator Frequency (380–470 MHz and 450–520 MHz) Figure 5-17. No 16.8 MHz Reference Oscillator Frequency (380–470 MHz and 450–520 MHz) U5751DC Voltages Pin 1 Pin 2 Pin 3 Pin 4 Pin 5No connection 1.5 Ground 1.5 3 >800mVpp 16.8MHz? Probe pin 3 of Y5750 for 16.8MHzSTART No 16.8MHz Reference No Ye s >800mVpp at pin 23 U5752?No Ye sCheck C5761Replace Y5750 3.0VDC at pin 4 of Y5750?No Ye sCheck 3.0V regulator path...
Page 208
May 25, 20056881096C74-B 5-28Troubleshooting Charts: Flowcharts 5.6.14 Poor RX Sensitivity or No RX Audio (380–470 MHz and 450–520 MHz)—Part 1 of 2 Figure 5-18. Poor RX Sensitivity or No RX Audio (380–470 MHz and 450–520 MHz)—Part 1 of 2 Poor Rx Sensitivity or no Rx audio Measure Transceiver 12dB Sinad by injecting signal at antenna portYe s Ye s3kHz FM Deviation 1kHz Audio tone 12 dB Sinad Sensitivity < - 117.5 dBm Std.
Page 209
6881096C74-BMay 25, 2005 Troubleshooting Charts: Flowcharts5-29 5.6.15 Poor RX Sensitivity or No RX Audio (380–470 MHz and 450–520 MHz)—Part 2 of 2 Figure 5-19. Poor RX Sensitivity or No RX Audio (380–470 MHz and 450–520 MHz)—Part 2 of 2 1 Inject a standard FM test signal into the antenna port. Use a spectrum analyzer and high-impedance RF probe to measure the signal at TP5301
Page 210
May 25, 20056881096C74-B 5-30Troubleshooting Charts: Flowcharts 5.6.16 RX IF—Poor SINAD or No Audio (380–470 MHz and 450–520 MHz)—Part 1 of 2 Figure 5-20. RX IF—Poor SINAD or No Audio (380–470 MHz and 450–520 MHz)—Part 1 of 2 Level is -3dB referenced to R5412?No No No Ye s Measure the IF signal level (109.65MHz) at C5403 Measure the IF signal level (109.65MHz) at C5406 Check Y5400 Level is +20dB relative to the RF input level at C5406?No Ye s Voltage level of 9.0V at R5404? Ye s Voltage level of 0.7V...