Motorola Xtl5000 Detailled 6881096c74 B Manual
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Chapter 5 Troubleshooting Charts 5.1 Introduction This chapter contains detailed troubleshooting flowcharts and tables. These should be used as a guide in determining the problem areas. They are not a substitute for knowledge of circuit operation and astute troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions in the theory of operation chapter prior to troubleshooting a radio. 5.2 List of Troubleshooting Charts Most troubleshooting flowcharts (see Table...
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May 25, 20056881096C74-B 5-2Troubleshooting Charts: List of Troubleshooting Charts NOTE:The term µC might be used in some of the following troubleshooting charts; µC = MCU or microprocesor. RFPA Power Control—No VGBIAS5-45 700–800 MHz No 16.8 MHz Reference Oscillator Frequency5-46 Poor RX Sensitivity or No RX Audio5-47 RX IF—Poor SINAD or No Audio5-49 RX Back-End—Poor SINAD or No Audio5-50 Low or No RX Injection Signal5-53 Low or No TX Injection Signal5-54 No TX Audio5-55 TX or RX VCO Unlock (Fail...
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6881096C74-BMay 25, 2005 Troubleshooting Charts: Troubleshooting Tables 5-3 5.3 Troubleshooting Tables 5.3.1 For Mid Power models This section contains troubleshooting tables that can help you isolate a problem in your radio. Table 5-2. XTL 5000 Troubleshooting Table (700–800 MHz, 380-470 MHz and 136-174 MHz) SymptomCheck SectionTroubleshooting ProcedureComponent No TX Modulation Controller Block With 80 mV rms, 1 kHz injected to the MIC_HI line and CPS mic gain level set to 0 (default), check the...
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May 25, 20056881096C74-B 5-4Troubleshooting Charts: Troubleshooting Tables No Keyloading Controller Connect proper KVL keyloader and cable and begin keyloading by pressing the PTT on the keyloader • Check data activity (5 V levels) on Boot_TX/Keyfail* line - J0401-25, U0401-5, or C0430. • Check data activity (5 V levels) at U0401-6. • Check data activity (5 V levels) at J0501-14• Absence of data may indicate failure with keyloader, cable, control head, control head flex, J0401, or VR0417. •...
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6881096C74-BMay 25, 2005 Troubleshooting Charts: Troubleshooting Tables 5-5 Radio Dead, Display Lights UpClocks A+Check for 32 kHz clock at U0102-4, and 16.8 MHz clock at C0106, C0911 Check A+ to the Control Head J0401-19, 20Presence of signals may indicate failure with U0001 (Microprocessor Board). Absence of signals may indicate failure with U0102 (Inverter) or with FGU reference oscillator circuit • Absence of voltage F0400 may be blown. No RX Audio/ Receive Does not UnsquelchController...
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May 25, 20056881096C74-B 5-6Troubleshooting Charts: Troubleshooting Tables No RX Audio/ Receive Does not Unsquelch (cont.)ABACUS Circuit (700-800 MHz)• Check for 20 kHz Frame Sync pulse signal at testpoint FS (U6000-31) • Check for 1.2 MHz Clock square wave at testpoint CLKOUT (U6000-28) • Check for random data pattern at testpoint DOUTA (U6000-29) • Check for Clock Oscillator at R6003 (18 MHz) • Check for Local Oscillator at C6026 (71.1 MHz or 75.6 MHz)• Absence of signal causes no receive....
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6881096C74-BMay 25, 2005 Troubleshooting Charts: Troubleshooting Tables 5-7 5.3.2 For High Power models and UHF R2 Mid Power This section contains troubleshooting tables that can help you isolate a problem in your radio. Table 5-3. XTL 5000 Troubleshooting Table (136-174 MHz, 380-470 MHz and 450-520 MHz Mid Power) SymptomCheck SectionTroubleshooting ProcedureComponent No TX Modulation Controller Block With 80 mV rms, 1 kHz injected to the MIC_HI line and CPS mic gain level set to 0 (default), check...
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May 25, 20056881096C74-B 5-8Troubleshooting Charts: Troubleshooting Tables Radio Dead, Display Does Not Light UpBlown Fuse Check fuse in red lead of power cable (or green lead if used)Absence of signal may indicate failure with J0401, J0402, VR0412, or VR0402 Controller Section • Check for IGNITION at J0401- 27, 28 • Check for A+ at Q0503, VR0950, J0401-19,21, or TP0414• Absence of signal may indicate failure with J0401 • Absence of signal may indicate failure with J0950, J0401 or VR0950...
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6881096C74-BMay 25, 2005 Troubleshooting Charts: Troubleshooting Tables 5-9 No RX Audio/ Receive Does not UnsquelchController Block (Inject 1 kHz tone, 3 kHz deviation into radio antenna, set volume to rated audio. • Check for speaker leads shorted to ground, or at U0204- 4, 6. • Check for > 30 mV rms audio at audio PA input, U0204-1,9. • Check for > 30 mV rms audio at U0206-8 or TP0205. • Check for > 30 mV rms audio at U0210-6 or U0200-2. • Check that U0204-8 is >10 V• Short may indicate failure...
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May 25, 20056881096C74-B 5-10Troubleshooting Charts: Troubleshooting Tables No RX Audio/ Receive Does not Unsquelch (cont.)ABACUS Circuit (700-800 MHz)• Check for 20 kHz Frame Sync pulse signal at testpoint FS (U6000-31) • Check for 1.2 MHz Clock square wave at testpoint CLKOUT (U6000-28) • Check for random data pattern at testpoint DOUTA (U6000-29) • Check for Clock Oscillator at R6003 (18 MHz) • Check for Local Oscillator at C6026 (71.1 MHz or 75.6 MHz)• Absence of signal causes no receive....