Icom IC-R20 Service Manual - Page 56

SECTION 10 BLOCK DIAGRAM ANTENNA 0.1500 - 3304.9999 MHz RF UNIT Explanatory notes VOLTAGE LINE RX LINE RECORDING LINE PLAYBACK LINE LIMIT D68 1SV172 0.4950-1.6200 MHz BAR ANT ANT TUNE D100: SVC347 LEVEL CONV. VP A-TRAC Q513: XP4601 HF3V ATT ATT-CONT. Q508: XP4312 Q507: 2SC5008 D69: 1SV308 D169-D170: MA2S728 LPF ANT SW Q510: UMD6 Q506: UNR9110J 1SV308 D65-D66, D73, D74 MF BAND SW LPF BAND SELECT D178: 1SS400 Q504: XP1110 D64, D67, D70: 1SV308 HF3V Q505: 2SC4226 D76: MA2S077 D164: MA2S728 BAND SW RF AMP D163: MA2S728 A-AGC HF-L BPF HF-H BPF HPF D13: 1SV308 D3: 1SV308 BAND SW D11: 1SV308 PRE AMP Q14: 2SC5006 D162: MA2S728 D166: MA2S728 A_VHF3V RF AMP A-VHF BPF Q550: FH102 D149: MA2S728 D148: MA2S728 A-AGC D1-D2: HVC350B B_VHF3V B-VHF RF AMP BPF Q549: 2SC5006 D152: MA2S728 D145-D146: HVC350B D161: MA2S728 D75:1SV308 B-AGC 300M3V Q552:UNR9113J D101:MA2S077 30-300 MHz Q36:2SC5006 D160:MA2S728 ANT SW D167:MA2S728 BPF RF AMP Q35:2SC5006 D159:MA2S728 A_UHF3V D168:MA2S728 LPF PRE AMP RF AMP Q551: µPA805T D150: MA2S728 D151: MA2S728 A-AGC B_VHF3V RF AMP Q548: 2SC5006 D158: MA2S728 D153: MA2S728 B-AGC B_800M3V 800 MHz BPF RF Q24: 2SC5008 AMP D173: HVC375B D174: HVC375B B-AGC B_G3V Q26: 2SC5624 1GHz D155: MA2S728 BPF RF AMP D156: MA2S728 A-AGC A-UHF BPF D4-D5: HVC350B B-UHF BPF HVC350B D141 D142 BAND SW D72: 1SV308 D29: 1SV308 D25: 1SV308 D34: 1SV308 BPF D176:HVC375B D175:HVC375B B-AGC D36: 1SV308 D32: 1SV308 D143: 1SV308 D147: 1SV308 BAND SW OSC B_R3V B_R3V 266.7 MHz B_R3V B MODEC 1ST MIXER FI1 EFCH266MKQP1 2ND MIXER RF AMP IC18: µPC2746TB BRF IC15: µPC2757TB B 1ST IF FILTER IC16: µPC2757TB MODE SW D130: MA2S077 D131: MA2S077 LO AMP LO AMP Q9: 2SC5231 Q12: 2SC5277 IC3: MB15T61UL Q8: 2SC5231 IC2: µPC2746TB 19.65 MHz FI7 FL-293 XTAL BPF B MODEC MODE SW B_R3V Q542 2SC5006 IF AMP B_R3V B MODEC IC17: TA31136FN FM IF-IC B-MIXOUT MODE SW 0.450 MHz FI8 CFWM450E CERAMIC BPF B MODEC MODE SW AM/NFM B 2ND IF FILTER D132: MA2S077 D133: MA2S077 B-AGC D134:1SS400 D135:1SS400 AM/NFM B 3RD IF FILTER D136: D137: 1SS400 1SS400 LPF WFM A_R3V 3RD LO AMP B_R3V OSC LO AMP 19.2 MHz Q555 2SC5006 WIDEFM CONT. Q543 UNR9113J B-IFIN B_AM3V Q544 XP6501 LPF WFM B_AM3V Q545 ×1/2 XP6501 B_AM3V BUFF PLL IC BUFF 1-4B3V Q7: 2SC4117 Q6: 2SK880 VCO 3V Q10-Q11: XP1113 LOOP FIL D1:1SV245 1BVCO Q1:2SC5006 D2:1SV245 1B3V 863.3000- 1099.6999MHz 2B3V BUFF 1-4B3V D7-D10: 1SV308 LO SW RIPPLE FIL Q4: 2SC4617 247.0500/286.3500 MHz VCO Q1:FH102 D1:HVC350B LOOP FIL IF AMP AM DET AGC Q545 ×1/2 XP6501 BMODEC DET OUT AF SW AM DET ANL Q547:UNR9213J D139:MA2S728 B_DET B-AGC 2BVCO D3:HVC417C 683.3000-866.6999 MHz Q2:2SC5006 3B3V 3BVCO D4:HVC417C 566.3000-686.6999 MHz Q3:2SC5006 4B3V IC1: MB15E03SL PLL IC OSC BUFF Q553 MODE XP1113 CONT. B AM FM B WFMC B_R3V IC21: CD4066 NB3V Q525: XP6501 Q521: 2SC4617 NB AMP NB3V DET NB3V MUTE SW 4BVCO D5:HVC417C 384.7000-441.6999 MHz Q4, Q5:2SC5006 Q3: 2SC5277 2NDDVCO Q523: 2SC4617 NB3V Q528: 2SC5006 Q524: 2SC4617 Q526: UNR9113J 1STBVCO BOARD BOARD AGC Q522: 2SC4617 A_R3V RF AMP IC19 µPC2746TB A_R3V 429.1 MHz FI4 EFCH429MKQP1 1ST Mix BRF IC1 µPC2757TB A 1ST IF FILTER Q9 2SC5231 LO AMP +3S A_R3V OSC REF OSC Q556: 2SC4617 19.2 MHz X1: CR-593 REF CONT. D171: HVC350B OSC LO 19.2 MHz AMP Q540: 2SC5006 3RD LO AMP A_R3V AMODEC 19.65 MHz FI3 AMODEC A_R3V MODE 2ND MIXER SW FL-293 XTAL BPF MODE SW IF AMP Q5: 2SC5006 IC10 µPC2757TB D58: MA2S077 AM/NFM/SSB D60:MA2S077 D59: MA2S077 A 2ND IF FILTER D61:MA2S077 A-AGC AMODEC A_R3V IC2: TA31136FN FM IF IC LPF WFM A_R3V Q519: UNR9113J Q534: XP1113 D119: DAP222 MODE CONT. A_R3V SSB3V WIDEFM CONT. Q41: UNR9113J AMODEC A-MIXOUT MODE SW D108:1SS400 D109:1SS400 D110:1SS400 A-IFIN FI6: CFWM450K3 CERAMIC BPF SSB/CW 0.450 MHz A 3RD IF FILTER FI2: CFWM450E AMODEC CERAMIC BPF MODE SW AM/NFM D113: 1SS400 D112: 1SS400 D111: 1SS400 LPF WFM Q13: 2SC5227 OSC BUFF IC3: MB15T61 PLL IC Q8: 2SC5231 BUFF IC2: µPC2746TB BUFF 1-4A3V Q7:2SC4117 Q6:2SK880 VCO 3V Q11, Q12: XP1113 LOOP FIL 1AVCO Q1: 2SC5006 D2: 1SV245 D1: 1SV245 1A3V 849.1000-899.0999 MHz 1-3A3V LO SW 2AVCO D3:HVC417C Q2:2SC5006 2A3V D7-D9: 1SV308 604.1000-849.0999 MHz 3AVCO D4: HVC417C Q3: 2SC5006 3A3V 429.2500-604.0999 MHz RIPPLE FIL Q4: 2SC4617 409.4500/ 448.7500 MHz LOOP FIL VCO Q1: FH102 D1: 1SV314 IC1: MB15E03SL PLL IC Q3: 2SC5277 OSC BUFF 2NDCVCO A WFMC A NFMC SSBC Q1 XP6501 IF AMP Q4 ×1/2 XP6501 AM DET Q4 ×1/2 XP6501 AGC A-AGC 3rd IF AMP Q531: 2SC4617 BFO RFO AMP Q530: 2SC4617 D115: RB876W D116: RB876W A_DETFM A_DETSSB SSBAF AMP Q532 2SK1069 AF SW IC12: CD4066 A_DET A_DETAM ANL Q529: UNR9213J D114: MA2S728 BAND SW D2: 1SV308 Q5: XP1113 LO SELCT BUFF IC4: MB15B03SL PLL IC BUFF Q2: 2SC5006 Q6: 2SC5277 OSC 1STAVCO BOARD BOARD B_AM3V B_800M3V B_G3V B_UHF3V B_VHF3V A_UHF3V A_VHF3V 300M3V NB3V HF3V BAND SW HPF RF AMP D1: 1SV308 IC2: µPC2749TB DOWNCONV BOARD MIX IC3: µPC2757TB BAND SW D8: 1SV308 D7: 1SV308 BAND SW BUFF D6: 1SV308 Q4: 2SC5624 D5: 1SV308 HPF Doubler VCO LPF D3: 1SV245 Q1: 2SC5006 1001.0000/2002.0000 MHz B_AMC B_800MC B_GC B_UHFC B_VHFC A_UHFC A_VHFC A_300MC NBC HFC DA/EXPND IC22: CD4094 IC20, IC14: M62366 Q546: XP4312 Q503: XP1113 Q503: XP1113 Q554: XP1113 Q554: XP1113 Q502: XP1113 Q502: XP1113 Q501: UNR9113J Q527: UNR9113J Q509: UNR9113J +3 REG +3 REG +3 REG +3 REG +3 REG +3 REG +3 REG +3 REG +3 REG +3 REG A_R3V B_R3V 10 - 1 B_DET A_DET