Icom IC-R20 Service Manual - Page 58

SECTION 11 11-1 RF UNIT W1 W2 CP5 EP2 BAR ANTENNA 0.4950 - 1.6200 MHz B 1 blue 2 white W 3 red R G 4 green R247 2.7 CP8 C912 0.1 R538 JPW CP7 R246 220k C567 0.1 D100 SVC347 R243 100k CP6 VP 45 6 321 Q513 XP4601 A_TRAC ANTENNA 0.1500 - 3304.9999 MHz R329 100k C669 0.001 R330 15k CP3 C541 C542 0.1 0.1 C546 0.1 D68 1SV172 R511 2.2k to DOWNCONV BOARD J1 DOWN CONV BOARD to DOWNCONV BOARD J2 HJ10 8 RFIN 7 GND 6 5 OSC PLLCK 4 PLLDATA 3 PLLESTB 2 1 IF_OUT C925 10p RFIN OSC PLLCK PLLDATA PLLESTB C924 C923 10p 10p R510 2.2k C923 - C925 except [SEA], [EXP] HJ11 11 22 33 44 55 66 1GLO 2GLO DOWN_CONV +3V C911 R534 100 2.7 +3S VP VOLTAGE DIAGRAM Explanatory notes VOLTAGE LINE RX LINE R234 820 D69 R232 1SV308 3.3k C540 0.1 R233 820 Q507 2SC5008 C872 0.1 D66 1SV308 D65 1SV308 D73 1SV308 C513 100p D74 1SV308 C859 0.001 C853 15p L125 47nH C852 27p L124 56nH L123 47nH C851 27p R496 4.7k C860 0.001 C854 9p L126 C855 18nH 47p C856 7p L127 18nH C857 100p R235 1k R327 100 C667 0.01 C570 0.001 ATT-ON 0V R237 2.7k C543 R236 0.001 10k C563 0.001 D170 MA2S728 D169 MA2S728 C545 0.01 R238 100k 654 Q508 XP4312 123 C558 0.001 C544 0.001 C674 47p C566 0.01 R241 2.2k D76 MA2S077 R240 1k C569 0.1 3 4 2 5 1 6 Q510 UMD6 R245 22k C536 0.1 MF C891 C522 0.01 0.0015 C533 0.0015 C523 0.0015 L88 5.6µH C534 100p C535 0.0012 C524 0.01 L89 10µH L86 0.68µH C657 150p L87 1µH D67 1SV308 C658 390p D70 1SV308 C525 0.0047 L91 3.9µH C526 0.012 L85 3.9µH R226 2.2k C527 47p C529 150p C528 10p C530 HF L 270p C531 100p R225 1k C568 47p C571 0.001 Q506 UNR9110J C537 0.1 R229 47k L90 100µH R230 10k C539 0.1 D72 1SV308 Q505 2SC4226 R228 C538 100 0.1 D164 MA2S728 Q509 UNR9113J C562 0.001 AGC L81 0.27µH L82 0.33µH C511 36p C514 180p C512 10p C515 120p C416 VHF PRE-AMP L128 C13 27p 0.1µH 27p C12 47p Q550 FH102 4 3 5 2 6 1 R488 330 C842 0.001 R222 2.2k C516 220p C519 0.0047 L83 0.47µH C517 100p HF H C520 0.0018 L84 0.68µH C518 220p R223 2.2k C841 18p C843 8p R486 100 R78 330 C837 100p Q14 2SC5006 R539 15 C14 0.001 D64 1SV308 R224 3.3k C532 0.1 C521 0.1 C15 C16 1p 0.001 D163 MA2S728 5 1 2 4 3 C560 Q504 0.001 XP1110 C121 0.001 5 MHz 2.9V D178 1SS400 C561 0.001 D25 1SV308 R216 2.2k D75 1SV308 D101 MA2S077 ANTSW L70 0.10µH R484 22k L121 R485 0.18µH 4.7k R531 100k C839 0.001 C840 0.001 C548 0.001 L9 33nH L10 22nH 145 MHz 2.6V C897 0.001 30 - 300 MHz Q36 C665 100p C43 100p L133 2SC5006 56nH D148 MA2S728 D149 MA2S728 C142 0.001 C42 3.5p R494 C40 4.7k 15p C861 0.001 C666 390p C41 5p L92 0.39µH R18 15k C141 0.01 R105 68 R6 120 R108 2.2k L41 0.1µH R495 4.7k Q552 UNR9113J R106 47k C44 0.01 D167 MA2S728 R487 100 R9 120k L28 68nH C69 0.001 R8 15k D1 HVC350B 145 MHz 2.9V R10 L1 D2 R11 47k 47nH HVC350B 47k R81 2.2k C233 0.001 A-BAND VHF C408 0.001 C900 0.001 R478 330 D162 MA2S728 Q549 2SC5006 R540 15 C832 0.001 C838 100p C898 0.001 R476 120k L119 68nH C827 0.001 R479 15k D166 MA2S728 C833 1p C834 0.001 C835 0.001 D145 R481 HVC350B 47k L120 D146 R483 47nH HVC350B 47k C828 0.001 C836 0.001 B-BAND VHF D147 1SV308 R482 2.2k A_TRAC A_VHF3V A_ATTC B_TRAC B_VHF3V R335 100k C673 0.001 ANTSW EAR C676 22p D160 MA2S728 51 MHz 2.9V A_ATTC C899 0.001 D152 MA2S728 A_ATTC D161 MA2S728 D34 1SV308 AGC A_ATTC A_TRAC A_TRAC ANTSW EAR A_TRAC C858 12p D3 1SV308 C888 0.001 UHF PRE-AMP L3 15nH L4 22nH C218 1p C22 C23 7p 5p L5 L39 15nH 39nH R489 22k 433 MHz 2.6V C844 0.001 Q551 UPA805T R491 330 C847 0.001 4 3 C845 5 2 8p 6 1 R490 4.7k L122 47nH C846 0.001 C848 R492 3p 150 R493 150 C850 100p 470 MHz 2.9V R239 2.2k C54 0.001 R95 2.2k D11 1SV308 C32 0.001 R522 100k C901 0.001 B BAND 800M R101 47k D174 HVC375B L130 3.9nH C145 0.001 D173 HVC375B L129 3.9nH C138 470p D157 MA2S728 D154 MA2S728 C887 0.001 R100 C214 12k 0.001 L131 3.9nH Q24 2SC5008 R93 R523 120 100k L132 3.9nH C886 0.001 D176 HVC375B D175 HVC375B B_ATTC AGC B_800M3V R102 2.2k D32 1SV308 R524 100k D13 C45 C46 C49 1SV308 470p 3p 3p R99 R98 1k 2.2k C55 0.001 C47 6p L11 15nH C48 6p L12 10nH L13 5.6nH C50 1p C895 470p C5 470p C51 2.5p Q26 2SC5624 L43 1.5nH L44 4.7nH R19 C52 R20 47k 470p 330 R110 12k C147 2.5p D36 1SV308 R112 2.2k C148 470p C414 0.001 B_BAND 1G 1295 MHz 2.9V D156 MA2S728 B_ATTC D155 MA2S728 C849 100p ANTSW EAR A_TRAC Q35 2SC5006 R14 68k R88 C134 C27 330 0.001 0.001 C28 0.001 R15 47k C59 2p C30 0.001 C58 0.001 R16 47k C136 7p EAR A_TRAC D29 1SV308 L61 D4 L60 D5 R91 6.8nH HVC350B 6.8nH HVC350B 2.2k D150 MA2S728 R13 15k C410 0.001 A-BAND UHF D159 MA2S728 Q548 2SC5006 D168 MA2S728 C812 0.001 R473 47k C150 0.001 C815 0.001 C814 2p R474 47k C816 0.001 C817 7p A_UHF3V A_ATTC B_TRAC D143 1DV308 R469 68k D151 MA2S728 433 MHz 2.9V AGC B_ATTC B_800M3V R472 C811 C809 330 0.001 0.001 L112 6.8nH D141 HVC350B R471 15k C807 0.001 B_UHF3V B BAND UHF D153 MA2S728 D158 MA2S728 B_ATTC L113 6.8nH D142 R475 HVC350B 2.2k C808 0.001 C868 0.001 AGC B_800M3V B_TRAC B_TRAC B_G3V AGC B_G3V AGC AGC A_ATTC B_ATTC A_UHF3V B_UHF3V B_TRAC AGC A_ATTC B_VHF3V A_UHF3V A_R3V B_UHF3V B_R3V ANTSW A_TRAC AGC A_ATTC A_R3V B_R3V ANTSW B_R3V B_R3V A_R3V ANTSW ATT B1C HFC AGC B_R3V B2C B3C ANTSW A_R3V 300M3V EAR B_UHF3V B_ATTC B_800M3V B_TRAC B_G3V 433 MHz 3.0V IC15 µPC2757TB 1 2 3 RFI GND LO IFO VCC PS 6 5 4 C746 3.5p R423 15 C747 L101 0.001 6.8nH C71 3p C748 0.001 FI1 EFCH266MKQP1 I O L15 47nH C436 3p L74 47nH B BAND RF IN B_VCO OUT C919 0.001 IC16 µPC2757TB 1 2 3 RFI GND LO IFO VCC PS 6 5 4 C749 0.001 D_VCO OUT D_VCO OUT B_VCO OUT B_RXV C921 0.001 R533 10 C910 100 R501 4.7k C866 0.001 R497 220 3 2 1 GND GND IN OUT GND VCC 4 5 6 IC18 µPC2746TB C864 0.1 B BAND RF AMP C865 0.001 R499 82 R498 100 R500 82 433 MHz 1.9V A_TRAC 300M3V A_VHF3V A_UHF3V B_VHF3V B_UHF3V B_G3V B_800M3V B_R3V A_R3V B_TRAC Q501 UNR9113J Q502 XP1113 5 4 C503 0.001 Q554 XP1113 4 C862 0.001 5 C863 0.001 Q503 XP1113 5 C504 0.001 4 C505 0.001 A_R3V A_300MC 1 A_VHFC 2 3 A_UHFC 3 2 1 B_R3V 1 2 3 R323 220 145 MHz 2.0V B_R3V IFO16 C750 0.001 CP18 ATT AGC A B_VHFC B_UHFC B_GC B_800MC ANTSW B_TRAC A_ATTC C662 0.1 R231 4.7k IC19 µPC2746TB 3 GND 2 1 GND IN OUT 4 GND 5 6 VCC A BAND RF AMP C663 0.1 R325 82 C664 0.1 R324 100 R326 82 A_ATTC IFO10 C_VCO OUT A_VCO OUT A_R3V L56 6.8nH C153 0.1 IC1 µPC2757TB 1 2 3 RFI IFO GND VCC LO PS 6 5 4 C206 3.5p R220 15 C70 0.001 C677 2p R4 R221 330 330 145 MHz 3.0V FI4 EFCH429MKQP1 I O L94 33nH C678 0.001 C435 0.001 C683 0.001 L93 22nH L95 15nH C679 0.001 IC10 µPC2757TB 1 2 3 RFI IFO GND VCC LO PS 6 5 4 C432 0.001 A_R3V A-AGC B 11 - 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