Motorola Astro Xts5000 Detailed 6881094c31 E Manual
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Page 121
November 16, 20066881094C31-E 5-30Troubleshooting Charts: VOCON RX Audio (for kit NNTN5567) VOCON RX Audio—Page 2 MAEPF-27395-O Make sure that you look at all solder contacts. Check resistors and capacitors associated with this check. If all look fine, then replace U502. Make sure that you look at all solder contacts. Check resistors and capacitors associated with this check. If all look fine, then replace U503. Signal Present? Check Preamp Output Signal at C530 No No No No No Ye s Ye s Ye sYe s Ye s 1...
Page 122
6881094C31-ENovember 16, 2006 Troubleshooting Charts: RX RF5-31 5.14 RX RF—Page 1 Frequency OK? VHF: 44.85 MHz UHF R1/R2: 73.35 MHz 700-800: 109.65 MHz Inject a standard FM test signal into the antenna port. Use CPS to ensure that attenuator feature is disabled. Use a spectrum analyzer and high-impedance RF probe to measure the IF signal at TP12 (700-800) or TP15 (VHF) or TP455 (UHF R2) on side 2 No No Yes Yes Poor RX sensitivity or no RX audio Check RXLO Replace bad part Remove cable assembly,...
Page 123
November 16, 20066881094C31-E 5-32Troubleshooting Charts: RX RF RX RF—Page 2 Q501-c = 5.0 Vdc?No No No YesYes Yes Repair Defects Visual examination OK?Check Voltage Regulator U1 Q501-e = 3.7 Vdc?No YesReplace Q501 Replace Q502 Remove SH501 (UHF R1 & 700-800) or SH502 (VHF and UHF R2), inspect 2nd LO VCO Signal Present? Measure 2nd LO at TP501 (UHF R1 & 700-800) or TP18 (VHF and UHF Range 2) on PCB side 2 No No Yes Yes LO Freq. OK? VHF: 42.6 MHz UHFs: 71.1 MHz 700-800: 107.4 MHz Measure RXCK,...
Page 124
6881094C31-ENovember 16, 2006 Troubleshooting Charts: RX RF5-33 RX RF—Page 3 TP502 = 0 Vdc?No No YesYes Repair defects Measure RF levels at first preselector filter and compute filter loss. VHF & UHF2: TP401, TP9 UHF: TP13, U401-3 700-800: TP13, D401-3 No Yes Loss < 3 db? Measure RF levels at LNA and compute LNA gain. VHF & UHF2: TP9, TP12 UHF: U401-1, TP402 700-800: D401-3, TP402 Measure RF levels at second preselector filter and compute filter loss. VHF & UHF2: TP12, TP451 UHF: TP402, TP403 700-800:...
Page 125
November 16, 20066881094C31-E 5-34Troubleshooting Charts: RX RF RX RF—Page 4 Ye s Fbit < 1.2 MHz?Measure tuning voltage (Vt) at R512 No No No Ye s Ye s Vt= 3 Vdc? Repair defects Replace Varactor D501Replace Abacus U500Repair defects Visual examination OK? 4 Visual examination OK? Remove SH501, inspect components No Ye s5 5No Ye s Remove SH501, inspect clock oscillator circuit at U500-19, 20Vt = 0 Vdc? 5 Clock synthesizer MAEPF-27473-O
Page 126
6881094C31-ENovember 16, 2006 Troubleshooting Charts: RX RF5-35 RX RF—Page 5 dac1 = dac2? Measure prselector filter tuning voltage dac1 and dac2. VHF & UHF2: None, TP29 UHF R1: TP401, TP405 700-800: TP401, TP405 No Yes Is unit VHF or UHF2? No Yes Replace IF filter. VHF & UHF2: FL451 UHF R1: FL490 700-800: FL403Repair defects 68 Visual inspection OK? Remove IF filter shield. Check IF filter and LC matching networks. VHF & UHF2: SH451 UHF R1: SH403 700-800: SH403 No Yes VHF/UHF: Check discrete preselector...
Page 127
November 16, 20066881094C31-E 5-36Troubleshooting Charts: TX RF (VHF and UHF Range 2) 5.15 TX RF (VHF and UHF Range 2)—Page 1 TX power OK? Place XCVR and VOCON into the analysis fixture. Key up. Measure RF power at antenna port Ye s No Ye sNo No or low TX power Check FGU Frequency OK? No Ye sCheck FGU Level about -3 dBm?Check coaxial connector and cable assembly Measure RF level at Q107 pin 2 Use a spectrum analyzer and high-impedance RF probe. Measure TXRF at C016 Level about +15 dBm?NoNo Ye s Ye sLevel...
Page 128
6881094C31-ENovember 16, 2006 Troubleshooting Charts: TX RF (VHF and UHF Range 2) 5-37 TX RF (VHF and UHF Range 2)—Page 2 MAEPF-27420-C RAWB+ about 7.2 Vdc? Measure RAWB+ at Q107-drain No No No YesYes Yes Check continuity V.gate about 2 to 3 Vdc?Check continuity DC bias is OK, control is OK, RFIN is OK, PA has low gain Replace Q107NoYesMeasure RF level at pin 6 of Q107 Is unit VHF or UHF R2? No YesRemove SH10 1and check for parts off pad Level about +35 dBm? Replace U102. For VHF and UHF Range 2, check...
Page 129
November 16, 20066881094C31-E 5-38Troubleshooting Charts: TX RF (VHF and UHF Range 2) TX RF (VHF and UHF Range 2)—Page 3 INT > 5 Vdc? Vgate at TP111 is low (< 4 Vdc) Measure INT at TP104 Yes No No YesYesNoReplace Q108 INT is low. Measure VLIM at TP119 PCIC is programmed. Measure TEMP at R124Bad PCIC Replace U104 VLIM about 2 to 3 Vdc? No Yes Measure RFIN at TP101TEMP < 1.0 Vdc at 25C? RFIN is low, INT is low, bad PCIC, replace U104TP101 < 0.5 Vdc?Low output power, RFIN is high, check RF detectors and op...
Page 130
6881094C31-ENovember 16, 2006 Troubleshooting Charts: TX RF (UHF R1/700-800 MHz) 5-39 5.16 TX RF (UHF R1/700-800 MHz)—Page 1 TX power OK? Place XCVR and VOCON into the analysis fixture. Key up. Measure RF power at antenna port Ye s NoNo Ye s Ye sNo No or low TX power Check FGU Frequency OK? No Ye sCheck FGU Level about -3 dBm?Check coaxial connector and cable assembly Measure RF level at driver amp outlet, C107. Use a spectrum analyzer and high-impedance RF probe. Measure TXRF at TP11 RF level OK?...