Icom ic-r20 Service Manual
Also see for IC-R20: Price listInstruction manualInstruction manualService manual
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2 - 1SECTION 2 INSIDE VIEWS2-1 RF UNIT• Top view• Bottom viewHighpass filter circuit(C854, C856, C858)470—833 MHzRF amplifier(Q24: 2SC5008)1G RF amplifier(Q26: 2SC5624)B-BAND RF amplifier(IC18: PC2746TB)B-BAND 1st mixer(IC15: PC2757TB)B-BAND 1st IF filter(266.7 MHz)(FI1: EFCH266MKQP1)B-BAND 2nd mixer(IC16: PC2757TB)SSB AF amplifier(Q532: 2SK1069)SSB IF amplifier450 kHz (Q531: 2SC4617)BFO mixer(D115, D116: RB876W)B-BAND 3rd Lo amplifier(Q555: 2SC5006)B-BAND 2nd IF amplifier(Q542: 2SC5006)A-BAND IF IC(IC2: TA31136FN)A-BAND 2nd IF amplifier(Q5: 2SC5006)A-BAND 3rd Lo amplifier(Q540: 2SC5006)A-BAND 2nd IF filter(19.65 MHz)(FI3: FL-293)A-BAND 2nd mixer(IC10: PC2757TB)A-BAND 1st IF filter(429.1 MHz)(FI4: EFCH429MKQP4)A-BAND 1st mixer(IC1: PC2757 TB)A-BAND RF amplifier(IC19: PC2757 TB)30—300 MHz RF amplifier(Q36: 2SC5006)A-UHF RF amplifier(Q35: 2SC5006)B-UHF RF amplifier(Q548: 2SC5006)Lowpass filter circuit (L123—L125)A/B-UHF (pre-amplifier (Q551: PA805T)PLL reference oscillator circuitOscilktes 19.200 MHzB-BAND FM IF IC(IC17: TA31136FN)X1: CR-593,D171: HVC350BQ556: 2SC4617B-BANDAM detector and AGC amplifier(Q545: XP6501)A-BAND AM detectorand AGC amplifier(Q4: XP6501)A/B-VHFpre-amplifier(Q550: FH102)A-VHF A-bandRF amplifier(Q14: 2SC5006)MF/HF-L/HF-HRF amplifier circuitQ505: 2SC4226,D163, D164:MA2S728B-BAND IF amplifier(Q544: XP6501)A-BAND IF amplifier(Q1: XP6501)DOWNCONV BOARD1STBVCO BOARD1STAVCO BOARDBar antenna2NDDVCO BOARD2NDCVCO BOARD |
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