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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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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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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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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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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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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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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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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 from U5750 >500mVpp at pin 2 U5751?No Ye sCheck C5760 and R5763 >3.0Vpp at pin 4 U5751?No Ye sCheck U5751 >1.4Vpp at TP5791?NoCheck L5753, C5768, C5763, R5768 and C5767Measure 16.8MHz Signals with Oscilloscope having a bandwidth >100MHz. NOTE: L5753 and C5768 filter the distorted output of U5751 resulting in a clean sinusoidal 16.8MHz signal. R5768 and C5763 adjust the amplitude.
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.
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
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 at Q5401 Base (pin 1)? Ye s Measure the DC Bias voltage level on transistor Q5401 Replace Q5401 Inspect biasing components and check Voltage Regulator U0950 for normal operation Inspect crystals and matching networks for missing components and/or soldering defects 1