Icom IC-7410 Service Manual - Page 87

SECTION 10. VOLTAGE DIAGRAM • DISPLAY BOARD (DISPLAY BOARD-1) NR NB VR (INSIDE)/(OUTSIDE) C2 0.01 R1 2 1 R2 4.7K 3 5 4 R3 4.7K 6 C3 RV-324 0.01 J2 GND1 6 3R3V1 6 5 NBL 5 4 GND2 4 3 3R3V2 3 2 NRL 2 1 1 VR-A BOARD MIC GAIN RF PWR (INSIDE)/(OUTSIDE) R1 R4 4.7K R5 RV-314 4.7K AF RF/SQL VR (INSIDE)/(OUTSIDE) VR-B BOARD R6 RV-314 R7 4.7K R8 4.7K C5 0.01 C6 0.01 C3 C4 0.01 0.01 J2 3R3V 10 9 M AFL 8 MRFL 7 GND 6 GND 5 SAFL 4 SRFL 3 GND 2 GND 1 PHONE-J J2 JACK BOARD J102 EP1 MPZ1608S221A MPZ1608S221A R1 180 EP2 180 R2 EP3 MPZ1608S221A EP101 MMZ1608Y102BT C2 C1 0.01 0.01 MMZ1608Y102BT MMZ1608Y102BT EP4 J1 HEMP 10 EP5 PHOS 9 EP6 PHE 8 PHOM 7 PHES 6 MMZ1608Y102BT PHNK 5 GND 4 DSHK 3 DOTK 2 GND 1 MMZ1608Y102BT EP102 GND 12 11 ELEC-KEY-J C102 0.01 C101 0.01 C8 J1 1 7 2 1 MIC 47P EP11 2 +8V EP5 7 GND EP4 3 MIC U/D EP2 6 8 3 8 AF OUT 6 GND EP7 4 SQL EP3 5 4 5 P.T.T EP6 MMZ1608Y102BT x6 C1 0.01 EP9 MMZ1608D301B EP10 MMZ1608D301B EP12 MPZ2012S601A MIC BOARD C2 0.01 C3 0.01 C4 100P C5 0.01 C6 0.01 C7 0.01 TO MAIN J2 AFO 10 8V 9 MUDL 8 SQLS 7 PSEND 6 GND 5 4 MICE 3 2 MICI 1 J1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 C22 0.1 R23 0 PHOM PHEM M ICE MICI MSEND RDS -12V 14V 8V 5V 3R3V C21 R22 0.001 2.2K .%&$#%-.+)*6 .'8'.     J61 1 12 2 3 3 4 4 55 66 3R3V NBL 3R3V J51 1 2 3 4 5 6 7 8 9 10 1 3R3V 2 3M 4 RFPL 5 6 J31 1 2 3 4 5 6 7 8 9 10 PHEM PHOM PHEM PHOM PHEM PHNK R31 L31 L32 220 100U 100U R32 0  Q501 2SD1619 C51 0.01 R54 R55 10K 150 J21 1 2 3 4 5 6 7 8 9 10 AFO L21 8V EP22 L22 L23 100U 100U 100U GND MMZ1608Y102BT GND M ICE L24 GND 10U MICI L25 100U   14V EP1 MPZ1608S601A -12V EP2 MMZ1608Y102BT 8V EP3 MMZ1608Y102BT 5V EP4 MMZ1608Y102BT 3R3V EP5 MMZ1608Y102BT MICE_ EP10 MMZ1608Y102BT MICI_ EP11 MMZ1608Y102BT MPHN EP7 MPHNE EP6 PSENI R7 PTRAS R8 FRES R3 LRXD R4 LTXD R5 PWRK R6 MMZ1608Y102BT MMZ1608Y102BT 220 220 220 1K 1K 220 8 BKLV NRL CONT2V IGL CONT1V AFL RFL PHNK DSHK DOTK 14V R112 L111 12 CD54NP C117 0.1 C113 10  Q112 2SB1201 L112 Q111 KTC4075 D111 D 10F-#A814AY .%&%1064#56 .'8'.     MAZ8030GH R113 10k C114 47 CE-FS R115 220 R118 47k C1117 C111 0.1 10 5V SN74AHCT1G86DCK 1 5 2 3 4 IC111 R156 10K R162 1.5M C151 0.1 R157 10K R163 1.5M Q113 2SC3647 R170 2 820k R174 1 3 470 IC152 NJM4558M R171 6 820k R175 7 5 IC152 470 NJM4558M DCONT CONTS C152 0.1 R143 C143 R141 C141 100 10 100 8 IC151 V+ NJM4558M GND 4 10 R144 8 V+ IC152 GND NJM4558M 4 C144 R142 C142 100 10 R168 100 10 1.5M R164 R154 R165 220k 2 2.2M 3 820K IC151 1 R172 56K NJM4558M R151 15k R116 3.3K R117 3.3K C115 0.047 (CFL) 8 .%&%1064#56 .'8'.     8 Q114 2SC3647 6373-T170 C116 5 4 3 2 1 T113 6 12P 7 J111 CFL- 1 2 3 CFL+ 4 3183 CFL CASE MP111 MAIN DIAL 1 2 3 4 (EX-2500) 5 MAINDBK_ M AINDAK_ 5V MAINDBK M AINDAK J101 1 2 3 4 6 PBT2AK PBT2BK PBT1AK PBT1BK J91 11 22 33 4 4 5 65 6 PBT BOARD J1 6 5 4 3 2 1 S1 PBT2AK2 A PBT2BK3 B 1 COM PBT1AK 5 A PBT1BK 6 B 4 COM TP90D96E20 PITCHL NOTL J81 1 3R3V 2 3 1 2 3 4 4 3R3V 5 5 66 C2 0.01 J1 6 GND1 R2 5 3R3V1 4.7K 4 PITCHL 3 GND2 2 3R3V2 R3 1 NOTL 4.7K C3 0.01 R1 RV-324 VR-C BOARD R169 TWIN PBT (INSIDE)/(OUTSIDE) ( I N S I D E ) / ( O U T S I D E ) NOTCH CW PITCH VR R158 12k R150 39k R159 47k R166 220K R167 R155 6 2.2M 5 820K 1.5M IC151 7 R173 56K NJM4558M RITDAK RITDBK J71 11 22 33 4 4 5 5 6 6 J1 RIT BOARD 6 RIT 5 4 S1 3 RITDAK 2 A 2 1 RITDBK 3R3V 3 1B COM EVEGC2F2524B DISPLAY-2 DISPLAY-2 MUDK SQLS PSND CP21 CF20 R21 100K MUDL M IGL RFPL AFL RFL 5V 3R3V MUDL MIGL RFPL AFL RFL SCONT DCONT CONT2V CONT1V BKLV RDS SCONT DCONT CONT2V CONT1V BKLV RDS FRES LRXD LTXD_ PWRK FRES LRXD LTXD_ PWR K R56 4.7K R51 4.7K Q503 KRA302E D501 KDS4148U Q502 KTC4075 R52 33K R53 15K C52 0.01 PHNK NRL NB L PBT1AK PBT1BK PBT2AK PBT2BK NOTL PITCHL RITDAK RITDBK DSHK DOT K R190 MAINDBK_ 47K M AINDAK_ 47K R191   R185 10K R186 10K R187 10K R188 10K R195 10K 3R3V PHNK NR L NBL PBT1AK PBT1BK PBT2AK PBT2BK NOT L PITCHL RITDAK RITDBK DSHK DOTK M AINDBK M AINDAK R196 82K R197 82K    10 - 1