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Download Icom - IC-7400 service manual
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for free by RadioAmateur.eu SECTION 12 VOLTAGE DIAGRAM 12-1 DSP UNIT DSP UNIT 5.01V 3.36V C8 10p R3 47k CK 4 Q CK 10 X1 CR-628 Q CK 4 10 IC4 SN74AHC74PW IC4 SN74AHC74PW 15 27 R162 R171 33 R161 10 10 C175 C174 0.1 C172 0.1 0.1 C171 C173 10 C104 10 0V C3 33p W2 IBS IBSY R1 1M C103 0.1 #01:5.2µs #02:10.4µs 3.3V C2 33p C102 10 0.1 8 Q C164 9 Q 6 5 4 VIN GND VOUT C163 11 CONT GND N.BYPASS 0.1 6 D 1 2 3 I G C162 12 O 10 5 6 5 4 VIN GND VOUT 22 3 13 Q CONT GND N.BYPASS C161 8 D 1 2 3 1 2 3 4 10 2 OUTR REF GND OUTL 0.1 1 9 VCC BCLK SDATA LRCLK 6.84V IC171 TK11250BM C157 11 Q CLK 6 D CLK 12 PR IC3 SN74AHC74PW C9 5p Q 5 IC102 BU9480F 8 7 6 5 OBS R2 470 CK Q PR 3 D C101 0.1 20 19 18 17 16 15 14 13 12 11 OBSY C6 47p 2 W1 CLK 1 IC1 TC7WHU04FU 8 1 7 2 6 3 5 4 CP1 C.P8S 0V IC3 13 SN74AHC74PW PR C1 0.0047 CLK L1 2.2µ PR EP2 7.61V IC161 BA033FP IC152 TK11218BM 0.1 IC101 SN74HCT244APW 1 VCC 2 ENA ENB 3 A1 YA1 4 YB4 B4 5 A2 YA2 YB3 6 B3 A3 7 YA3 YB2 8 B2 A4 9 YA4 YB1 10 GND B1 3.3V 0.9V 0V R151 68 C155 #01:10.4µs #02:20.8µs L102 2.2µ C156 L101 2.2µ 0.1 C7 0.1 4.07V C158 IC4 14 SN74AHC74PW V+ GND 7 C154 C4 0.0047 0.4V 0V 1.82V IC3 14 SN74AHC74PW V+ GND 7 2.6V #01:40ns #02:80ns 2.3V L3 2.2µ L2 2.2µ #01:80ns #02:160ns W151 W3 W171 W152 A Q201 XP4312 W303 L52 1.0µ 1 AGC1 DSP02 C202 0.1 C IC202 TC7SH04FU R501 4.7 R602 4.7k IC501 AK4528VF 1 2 3 4 5 6 7 8 9 10 11 12 13 14 C54 0.01 B C504 2.2 W302 A L601 100µ R601 1.2k 2.83V C201 0.1 R322 47 L502 2.2µ 1 2 3 4 D00 D01 D02 D03 D04 D05 D06 D07 L501 2.2µ C AOUTR+ AOUTRAOUTL+ AOUTLDGND VD VT DEM1 DEM0 PDN DFS CSN CCLK CDTI VCOM AINR+ AINRAINL+ AINLVREF AGND VA P/S MCLK LRCK BICK SDTO SDTI W501 C601 10 IC601 8 BA15532F V+ GND 4 R607 4.7k 2.83V 28 27 26 25 24 23 22 21 20 19 18 17 16 15 0.1 5 C507 0.1 C52 5p 2 6 AGC1 DSP02 C506 22 R51 1M C53 5p 5 AGC1 DSP02 C511 22p L302 2.2µ 3 W202 C505 0.1 L301 2.2µ 4 R201 47k X51 CR-709 R52 100 DSP02 C603 CP810 D15 D14 D13 D12 D11 D10 D09 D08 DSP02 B R609 4.7k IC601a BA15532F R603 390 R608 4.7k 2 IC601b BA15532F 1 5 C602 0.0015 R611 5.6k R604 390 R605 1k R606 1k C605 0.1 L651 100µ IC651 8 BA15532F V+ GND 4 3.93V W311 R655 4.7k W312 2.83V R324 10k L401 14 5 6 L403 2.2µ C403 0.0047 D13 D12 9 8 IC403 SN74AHCT374PW 1 VCC O-CTRL 2 8Q 1Q 3 8D 1D 4 7D 2D 5 7Q 2Q 6 6Q 3Q 7 6D 3D 8 5D 4D 9 5Q 4Q 10 CLK GND D06 D07 D15 D14 0.1 3 2.5V R707 1k OUT1 Q Q IC406 SN74AHC74PW R708 1k D CK D12 D13 D14 D15 CP358 11 ROO 2.49V DRES 0.0047 R751 4.7k R753 3.3k 22 GND GND DSPI2 GND 8V GND AGC1 GND GND GND DSPO2 C901 0.001 MAIN UNIT (1) 2 R752 4.7k R757 1k OUT4 C752 100p R754 6.8k C751 270p 2.49V R758 1k D0G D0F D05 D04 D0E CP356 CP355 C404 0.0047 CP354 CP352 20 19 18 17 16 15 14 13 12 11 VCC 8Q 8D 7D 7Q 6Q 6D 5D 5Q CLK O-CTRL 1Q 1D 2D 2Q 3Q 3D 4D 4Q GND 1 2 3 4 5 6 7 8 9 10 C758 10 1 3 R755 3.3k C757 100 IC701a µPC4570G2 C756 0.1 R756 6.8k C755 100p 3.84V J1001 DRIF 2 GND GND GND 8V GND MONI GND DRAF GND GND 22 1 GND GND DTAF GND 8V GND DAGC GND GND GND 21 DTIF D0A J902 GND1 2 GND1 IC405 BU4021BF D0H D0B D0C D0D R904 10k L405 2.2µ C408 0.001 D0D D0C D0B D0A 1 2 3 4 5 6 7 8 H QF QH D C B A VSS VDD G F E QG SER CLK P/S 16 15 14 13 12 11 10 9 GND1 IBSY DI D0G D0F D0E GND1 GND1 DO STBO RQO OBSY GND1 C405 0.0047 GND1 OUT1 OUT3 OUT5 OUT7 STBO OUT2 OUT4 OUT6 OUT8 GND1 W951 KEYIN DRES D03 D02 D01 D00 192K 1 RQI CK W952 GND1 UNLK 30 DO 10k 0.0047 21 2 to MAIN unit J1001 3.84V C706 0.1 10 CP351 12 - 1 C705 100p J901 1 12 OUT2 OUT3 L404 2.2µ IC404 SN74AHCT374PW CP357 CP353 R706 6.8k OUT5 OUT6 OUT7 OUT8 D0H CP359 C708 10 7 R705 3.3k C707 100 IC701b µPC4570G2 6 5 DSPI1 GND GND GND 8V GND AGC2 GND DSPO1 GND GND D11 D10 D09 D08 D07 D06 CP360 C702 100p R704 6.8k R702 4.7k D901 MA729 29 GND1 to MAIN unit J1000 W901 0.0047 C701 270p RQI 0.0047 D10 D11 PD EMU1 TDI TDO TMS EMU0 TCK TRST 2 13 D08 D09 C325 D CK 10k C324 Q IBS OBS D04 D05 D00 D01 D02 D03 C323 Q IC701 8 µPC4570G2 V+ GND 4 R703 3.3k R701 4.7k 4 20 19 18 17 16 15 14 13 12 11 C322 0.0047 2.5V IC406 SN74AHC74PW 1 V+ GND 7 0.1 L701 100µ 10k 4.7k 4.7k C654 0.1 R654 1k L406 2.2µ C401 0.0047 R902 CP306 CP307 CP308 IC651b BA15532F CK MEASUREMENT CONDITIONS frequency : 14.1MHz USB SG input : off Digital tester Oxilloscope(20MHz) Voltage at rx C407 0.001 R320 R321 R653 1k R903 C321 0.1 2.83V DI R901 A21 DVDD A22 A23 VSS RSV0 RSV1 CVDD CLKMD0 CLKMD1 PLLVSS XIN XOUT PLLVDD EXTCLK DVDD SHZ RESET VSS MCBL/MP EDGEMODE CVDD INT0 INT1 INT2 INT3 VSS XF0 XF1 DVDD TCLK0 TCLK1 VSS DX0 FSX0 CLKX0 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 10k 10k 10k R328 R327 R326 R325 10k CP304 CP303 C319 CP302 CP305 C318 0.1 0.1 C306 C317 0.1 0.0047 C305 A01 A00 C316 A03 A02 10k 0.0047 DVDD CLKR0 FER0 VSS DR0 TRST TMS CVDD TDI TDO TCK VSS EMU0 EMU1 DVDD D0 D1 D2 D3 VSS D4 D5 DVDD D6 D7 CVDD D8 D9 VSS D10 D11 DVDD D12 D13 D14 D15 R318 C304 A04 IC301 TMS320VC33PGE120 0.1 A08 A07 A06 A05 C315 A10 A09 10k 0.1 R317 C303 0.0047 A12 A11 C314 0.0047 C655 1 5 R652 390 16 15 14 13 12 11 10 9 144 143 142 141 140 139 138 137 136 135 134 133 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 C302 IC651a BA15532F C703 VCC QA SI G RCK SCK SCLR QH’ IC406 SN74AHC74PW C320 0.1 DVDD H1 H3 VSS STRB R/W DVDD IACK RDY CVDD HOLD HOLDA VSS D31 D30 D29 DVDD D28 D27 VSS D26 D25 D24 DVDD D23 D22 VSS D21 D20 CVDD D19 D18 DVDD D17 D16 VSS A14 A13 0.1 A15 R658 4.7k 6 7 3 C704 10 QB QC QD QE QF QG QH GND CLK 1 2 3 4 5 6 7 8 PR D01 D02 D03 D04 D05 D06 D07 IC401 SN74AHC595PW C313 C301 0.0047 A20 VSS A19 A18 A17 DVDD A16 A15 VSS A14 A13 CVDD A12 A11 DVDD A10 A9 VSS A8 A7 A6 A5 DVDD A4 VSS A3 A2 CVDD A1 A0 DVDD PAGE3 PAGE2 VSS PAGE1 PAGE0 R656 4.7k 2 1 C651 0.0015 R659 5.6k 2.2µ C406 0.0047 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 R651 390 R657 4.7k D00 Q302 DTC144EU CLK 0.1 C312 R323 10k KEYIN UNLK PR 0.0047 C311 10k 10k 10k 10k R310 R311 R312 R313 0.0047 10k 10k R308 R309 C309 10k R307 CP300 W310 0.1 W308 W309 10k 10k R305 R306 C308 2.2k 2.2k R303 R304 0.1 C307 Q301 DTC144EU C606 1 R610 4.7k 6 7 3 0.1 CP808 CP809 A08 A07 A06 A05 A04 A03 A02 A01 A00 C652 CP806 CP807 DSP02 W902 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 10 W201 CP805 VSS A8 A7 A6 A5 A4 A3 A2 A1 A0 G DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 VSS C604 CP804 A9 A10 A11 A12 A13 A14 A15 NC W VCC RP E DQ15 DQ14 DQ13 DQ12 DQ11 DQ10 DQ9 DQ8 10 100k 100k CP802 CP803 100k R801 R805 R804 C801 R803 0.0047 100k R802 100k CP301 CP811 CP812 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 C653 C51 0.0047 IC51 TC7WHU04FU 8 1 7 2 6 3 5 4 CP801 8V FBSY FOK GND1 FSTB FCK FDAT DRES FINT FENA FDIS GND1 A09 A10 A11 A12 A13 A14 A15 C510 22 0V L51 2.2µ C802 0.001 C509 0.1 1.7V 1.5V IC201 M29W102BB L801 2.2µ IC801 SN74AHC244PW VCC 20 ENA ENB 19 A1 YA1 18 YB4 B4 17 A2 YA2 16 YB3 B3 15 A3 YA3 14 YB2 B2 13 A4 12 YA4 YB1 B1 11 GND C508 0.1 1 2 3 4 5 6 7 8 9 10 R905 10k R906 10k J1000 2 DGND 1 DGND DROW DCK DGND DROR DRBY DGND CTFL TOFF VSOL NC DGND DSKY DRES 29 30 NC DGND DWBY DDTW DGND DDTR DSTR DGND NSOL RTDT DCBY NC DGND DSST DGND
